Remote Automation Solutions Bristol Series 2808 Temperature Owner's manual

www.EmersonProcess.com/Bristol

Instruction Manual

CI-2808-41A

Feb., 2007

M

odel 2808-41A

Series 2808 Temperature Transmitters

IMPORTANT! READ INSTRUCTIONS BEFORE STARTING!

Be sure that these instructions are carefully read and understood before any

operation is attempted. Improper use of this device in some applications may result in

damage or injury. The user is urged to keep this book filed in a convenient location for

future reference.

These instructions may not cover all details or variations in equipment or cover

every possible situation to be met in connection with installation, operation or main-

tenance. Should problems arise that are not covered sufficiently in the text, the pur-

chaser is advised to contact Bristol for further information.

EQUIPMENT APPLICATION WARNING

The customer should note that a failure of this instrument or system, for

whatever reason, may leave an operating process without protection. Depending upon

the application, this could result in possible damage to property or injury to persons.

It is suggested that the purchaser review the need for additional backup equipment

or provide alternate means of protection such as alarm devices, output limiting, fail-

safe valves, relief valves, emergency shutoffs, emergency switches, etc. If additional

in-formation is required, the purchaser is advised to contact Bristol .

RETURNED EQUIPMENT WARNING

When returning any equipment to Bristol for repairs or evaluation, please note

the following: The party sending such materials is responsible to ensure that the

materials returned to Bristol are clean to safe levels, as such levels are defined and/or

determined by applicable federal, state and/or local law regulations or codes. Such

party agrees to indemnify Bristol and save Bristol harmless from any liability or

damage which Bristol may incur or suffer due to such party's failure to so act.

ELECTRICAL GROUNDING

Metal enclosures and exposed metal parts of electrical instruments must be

grounded in accordance with OSHA rules and regulations pertaining to "Design

Safety Standards for Electrical Systems," 29 CFR, Part 1910, Subpart S, dated: April

16, 1981 (OSHA rulings are in agreement with the National Electrical Code).

The grounding requirement is also applicable to mechanical or pneumatic in-

struments that include electrically-operated devices such as lights, switches, relays,

alarms, or chart drives.

EQUIPMENT DAMAGE FROM ELECTROSTATIC DISCHARGE VOLTAGE

This product contains sensitive electronic components that can be damaged by

exposure to an electrostatic discharge (ESD) voltage. Depending on the magnitude

and duration of the ESD, this can result in erratic operation or complete failure of the

equipment. Read supplemental document S14006 at the back of this manual for

proper care and handling of ESD-sensitive components.

Bristol 1100 Buckingham Street, Watertown, CT 06795

Telephone (860) 945-2200

WARRANTY

A. Bristol warrants that goods described herein and manufactured by Bristol are free

from defects in material and workmanship for one year from the date of shipment

unless otherwise agreed to by Bristol in writing.

B. Bristol warrants that goods repaired by it pursuant to the warranty are free from

defects in material and workmanship for a period to the end of the original warranty

or ninety (90) days from the date of delivery of repaired goods, whichever is longer.

C. Warranties on goods sold by, but not manufactured by Bristol, are expressly limited

to the terms of the warranties given by the manufacturer of such goods.

D. All warranties are terminated in the event that the goods or systems or any part

thereof are (i) misused, abused or otherwise damaged, (ii) repaired, altered or

modified without Bristol's consent, (iii) not installed, maintained and operated in

strict compliance with instructions furnished by Bristol, or (iv) worn, injured or

damaged from abnormal or abusive use in service time.

E. THESE WARRANTIES ARE EXPRESSLY IN LIEU OF ALL OTHER

WARRANTIES EXPRESS OR IMPLIED (INCLUDING WITHOUT LIMITATION

WARRANTIES AS TO MERCHANTABILITY AND FITNESS FOR A PARTICULAR

PURPOSE), AND NO WARRANTIES, EXPRESS OR IMPLIED, NOR ANY

REPRESENTATIONS, PROMISES, OR STATEMENTS HAVE BEEN MADE BY

BRISTOL UNLESS ENDORSED HEREIN IN WRITING. FURTHER, THERE ARE

NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION OF THE

FACE HEREOF.

F. No agent of Bristol is authorized to assume any liability for it or to make any written

or oral warranties beyond those set forth herein.

REMEDIES

A. Buyer's sole remedy for breach of any warranty is limited exclusively to repair or

replacement without cost to Buyer of any goods or parts found by Seller to be

defective if Buyer notifies Bristol in writing of the alleged defect within ten (10) days

of discovery of the alleged defect and within the warranty period stated above, and if

the Buyer returns such goods to Bristol's Watertown office, unless Bristol's Water-

town office designates a different location, transportation prepaid, within thirty (30)

days of the sending of such notification and which upon examination by Bristol

proves to be defective in material and workmanship. Bristol is not responsible for

any costs of removal, dismantling or reinstallation of allegedly defective or defective

goods. If a Buyer does not wish to ship the product back to Bristol, the Buyer can

arrange to have a Bristol service person come to the site. The Service person's

transportation time and expenses will be for the account of the Buyer. However,

labor for warranty work during normal working hours is not chargeable.

B. Under no circumstances will Bristol be liable for incidental or consequential

damages resulting from breach of any agreement relating to items included in this

quotation, from use of the information herein or from the purchase or use by Buyer,

its em-ployees or other parties of goods sold under said agreement.

How to return material for Repair or Exchange

Before a product can be returned to Bristol for repair, upgrade, exchange, or to verify

proper operation, form (GBU 13.01) must be completed in order to obtain a RA (Return

Authorization) number and thus ensure an optimal lead time. Completing the form is very

important since the information permits the Bristol Repair Dept. to effectively and

efficiently process the repair order.

You can easily obtain a RA number by:

A. FAX

Completing the form (GBU 13.01) and faxing it to (860) 945-3875. A Bristol Repair

Dept. representative will return call (or other requested method) with a RA number.

B. E-MAIL

Accessing the form (GBU 13.01) via the Bristol Web site (www.bristolbabcock.com)

and sending it via E-Mail to [email protected]

. A Bristol Repair Dept.

representative will return E-Mail (or other requested method) with a RA number.

C. Mail

Mail the form (GBU 13.01) to

Bristol Inc.

Repair Dept.

1100 Buckingham Street

Watertown, CT 06795

A Bristol Repair Dept. representative will return call (or other requested method)

with a RA number.

D. Phone

Calling the Bristol Repair Department at (860) 945-2442. A Bristol Repair Depart-

ment representative will record a RA number on the form and complete Part I, then

send the form to the Customer via fax (or other requested method) for Customer

completion of Parts II & III.

A copy of the completed Repair Authorization Form with issued RA number should be in-

cluded with the product being returned. This will allow us to quickly track, repair, and

return your product to you.

Bristol Repair Authorization Form (off-line completion)

(Providing this information will permit Bristol to effectively and efficiently process your return. Completion is required to

receive optimal lead time. Lack of information may result in increased lead times.)

Date___________________ RA #___________________SH Line No.____________

Standard Repair Practice is as follows: Variations to this is

practice may be requested in the “Special Requests” section.

• Evaluate / Test / Verify Discrepancy

• Repair / Replace / etc. in accordance with this form

• Return to Customer

Please be aware of the Non warranty standard charge:

• There is a $100 minimum evaluation charge, which is

applied to the repair if applicable (√ in “returned”

B,C, or D of part III below)

Part I Please complete the following information for single unit or multiple unit returns

Address No. (office use only) Address No. (office use only)

Bill to : Ship to:

Purchase Order: Contact Name:____________________________________

Phone: Fax: E-Mail:

Part II Please complete Parts II & III for each unit returned

Model No./Part No. Description

Range/Calibration S/N

Reason for return

: Failure Upgrade Verify Operation Other

1. Describe the conditions of the failure (Frequency/Intermittent, Physical Damage, Environmental Conditions,

Communication, CPU watchdog, etc.)

(Attach a separate sheet if necessary)

2. Comm. interface used: Standalone RS-485 Ethernet Modem (PLM (2W or 4W) or SNW) Other:______________

3. What is the Firmware revision? _____________________ What is the Software & version?

Part III If checking “replaced” for any question below, check an alternate option if replacement is not available

A. If product is within the warranty time period but is excluded due

to Bristol’s warranty clause, would you like the product:

repaired returned replaced scrapped?

B. If product were found to exceed the warranty period,

would you like the product:

repaired returned replaced scrapped?

C. If product is deemed not repairable would you like your product:

returned replaced scrapped?

D. If Bristol is unable to verify the discrepancy, would you like the product:

returned replaced *see below?

* Continue investigating by contacting the customer to learn more about the problem experienced? The person to contact

that has the most knowledge of the problem is: ______________________________ phone_____________________

If we are unable to contact this person the backup person is: _________________________

phone_____________________

Special Requests: ____________________________________________________________________________________

____________________________________________________________________________________________________

Ship prepaid to: Bristol Inc., Repair Dept., 1100 Buckingham Street, Watertown, CT 06795

Phone: 860-945-2442 Fax: 860-945-2220 Form GBU 13.01 Rev. C 04/27/06

Bristol

Training

GET THE MOST FROM YOUR BRISTOL

BABCOCK INSTRUMENT OR SYSTEM

• Avoid Delays and problems in getting your system on-line

• Minimize installation, start-up and maintenance costs.

• Make the most effective use of our hardware and software.

• Know your system.

As you know, a well-trained staff is essential to your operation. Bristol Inc. offers a full

schedule of classes conducted by full-time, professional instructors. Classes are offered

throughout the year at three locations: Houston, Orlando and our Watertown, CT

headquarters. By participating in our training, your personnel can learn how to install,

calibrate, configure, program and maintain any and all Bristol products and realize the full

potential of your system.

For information or to enroll in any class, contact our training department in Watertown at

(860) 945-2343. For Houston classes, you can also contact our Houston office, at (713) 685-

6200.

A Few Words About Bristol Inc.

For over 100 years, Bristol

®

has been providing innovative solutions for the measurement

and control industry. Our product lines range from simple analog chart recorders, to

sophisticated digital remote process controllers and flow computers, all the way to turnkey

SCADA systems. Over the years, we have become a leading supplier to the electronic gas

measurement, water purification, and wastewater treatment industries.

On off-shore oil platforms, on natural gas pipelines, and maybe even at your local water

company, there are Bristol Inc. instruments, controllers, and systems running year-in and

year-out to provide accurate and timely data to our customers.

Getting Additional Information

In addition to the information contained in this manual, you may receive additional assis-

tance in using this product from the following sources:

Help Files / Release Notes

Many Bristol software products incorporate help screens. In addition, the software typically

includes a ‘read me’ release notes file detailing new features in the product, as well as other

information which was available too late for inclusion in the manual.

Contacting Bristol Inc. Directly

Bristol's world headquarters is located at 1100 Buckingham Street, Watertown,

Connecticut 06795, U.S.A.

Our main phone numbers are:

(860) 945-2200

(860) 945-2213 (FAX)

Regular office hours are Monday through Friday, 8:00AM to 4:30PM Eastern Time,

excluding holidays and scheduled factory shutdowns. During other hours, callers may leave

messages using Bristol's voice mail system.

Telephone Support - Technical Questions

During regular business hours, Bristol's Application Support Group can provide telephone

support for your technical questions.

For technical questions about TeleFlow products call (860) 945-8604.

For technical questions about ControlWave call (860) 945-2394 or (860) 945-2286.

For technical questions regarding Bristol’s OpenEnterprise product, call (860) 945-3865

or e-mail: [email protected]

For technical questions regarding ACCOL products, OpenBSI Utilities, UOI and all other

software except for ControlWave and OpenEnterprise products, call (860) 945-2286.

For technical questions about Network 3000 hardware, call (860) 945-2502.

You can e-mail the Application Support Group at: [email protected]

The Application Support Group maintains an area on our web site for software updates and

technical information. Go to: www.bristolbabcock.com/services/techsupport/

For assistance in interfacing Bristol hardware to radios, contact Bristol’s Communication

Technology Group in Orlando, FL at (407) 629-9463 or (407) 629-9464.

You can e-mail the Communication Technology Group at:

[email protected]

Telephone Support - Non-Technical Questions, Product Orders, etc.

Questions of a non-technical nature (product orders, literature requests, price and delivery

information, etc.) should be directed to the nearest sales office (listed on the rear cover of

this manual) or to your Bristol-authorized sales representative.

Please call the main Bristol Inc. number (860-945-2200) if you are unsure which office

covers your particular area.

Visit our Site on the World Wide Web

For general information about Bristol Inc. and its products, please visit our site on the

World Wide Web at: www.bristolbabcock.com

Training Courses

Bristol’s Training Department offers a wide variety of courses in Bristol hardware and

software at our Watertown, Connecticut headquarters, and at selected Bristol regional

offices, throughout the year. Contact our Training Department at (860) 945-2343 for course

information, enrollment, pricing, and scheduling.

2808-41A Contents / 0 - 1

CI-2808-41A

SERIES 2808 TEMPERATURE TRANSMITTER

MODEL 2808-41A

TABLE OF CONTENTS

SECTION TITLE PAGE #

Section 1 - INTRODUCTION

1.1 PRODUCT DESCRIPTION ........................................................................................... 1-1

1.2 MODEL NUMBER IDENTIFICATION........................................................................ 1-3

1.3 MODELS APPROVED FOR HAZARDOUS AREAS................................................... 1-5

Section 2 – INSTALLATION & SERVICE

2.1 INSTALLATION............................................................................................................. 2-1

2.2 FIELD WIRING NOTES................................................................................................2-2

2.2.1 Electrical Ports ............................................................................................................... 2-2

2.2.2 Access to Field Wiring Terminals.................................................................................. 2-2

2.2.3 Lead Dress ......................................................................................................................2-2

2.2.4 Recommended Wiring Practices ....................................................................................2-2

2.2.5 Connecting Sensors ........................................................................................................2-4

2.2.6 Signal/Power Connections.............................................................................................. 2-4

2.2.7 Grounding .......................................................................................................................2-4

2.3 WIRING OF 4-20mA SIGNAL/POWER LOOP ............................................................ 2-4

2.4 WIRING OF 1-5V SIGNAL/POWER LOOP.................................................................. 2-7

2.5 EFFECTS OF LEAD & LOAD RESISTANCE & SUPPLY VOLTAGE ...................... 2-7

2.6 TRANSMITTER HOUSING ROTATION ..................................................................... 2-9

2.7 2808-41A, PROBES, EXTENSIONS & THERMOWELLS ........................................ 2-10

Section 3 - CALIBRATION

3.1 CALIBRATION SETUP ................................................................................................. 3-1

3.2 ACCESS TO ADJUSTMENTS....................................................................................... 3-1

3.3 EXTERNAL CHECK PROCEDURE ............................................................................. 3-3

3.4 CALIBRATION ADJUSTMENTS .................................................................................3-4

3.5 TYPES OF RANGE CALIBRATION............................................................................. 3-5

3.6 ZERO-BASED CALIBRATION .....................................................................................3-8

3.7 ELEVATED ZERO CALIBRATION .............................................................................. 3-8

3.7.1 Zero Elevation Example ................................................................................................. 3-9

3.8 SUPPRESSED ZERO CALIBRATION ......................................................................... 3-9

3.8.1 Zero Suppression Example .......................................................................................... 3-10

Section 4 - SERVICE

4.1 GENERAL.......................................................................................................................4-1

4.2 TROUBLESHOOTING ..................................................................................................4-1

4.3 FACTORY REPAIRS...................................................................................................... 4-1

0 - 2 / Contents 2808-41A

CI-2808-41A

SERIES 2808 TEMPERATURE TRANSMITTER

MODEL 2808-41A

TABLE OF CONTENTS

SECTION TITLE PAGE #

Section 5 - SPECIFICATIONS

5.1 MODELS WITH RTD INPUT........................................................................................ 5-1

Sensor Type: ............................................................................................................. 5-1

Range Limits: ........................................................................................................... 5-1

Span Adjustments: ................................................................................................... 5-1

Zero Adjustments: .................................................................................................... 5-1

5.2 OUTPUT SIGNAL .......................................................................................................... 5-1

Range: ....................................................................................................................... 5-1

Power Source: ........................................................................................................... 5-1

Voltage Effect: .......................................................................................................... 5-1

Lead Wire Compensation (3-Wire RTD):................................................................5-1

Loop Resistance (4-20mA RTD): ............................................................................. 5-1

5.3 PERFORMANCE............................................................................................................5-1

Model Accuracy: ....................................................................................................... 5-1

Linearity: .................................................................................................................. 5-2

Max. Output Current (4-20mA RTD)...................................................................... 5-2

Max. Supply Current (1-5 Vdc RTD) ...................................................................... 5-2

Temperature Limits: ................................................................................................ 5-2

Input Lead Wire Effect: ........................................................................................... 5-2

Warm-up Drift:.........................................................................................................5-2

Ambient Temperature Drift: ................................................................................... 5-2

Humidity:..................................................................................................................5-2

RFI Immunity:.......................................................................................................... 5-2

5.4 DIMENSIONS ................................................................................................................ 5-2

Models without Loop Powered Indicator Option.................................................... 5-2

Models with Loop Powered Indicator Option ......................................................... 5-2

APPENDICES

Special Instructions for Class I, Division 2 Hazardous Locations...........................................Appendix A

Loop Powered Indicator Option.................................................................................................Appendix B

Surge Protector...........................................................................................................................Appendix C

2808-41A Introduction / 1-1

Section 1

INTRODUCTION

1.1 PRODUCT DESCRIPTION

Series 2808-41A Temperature Transmitters perform temperature measurements and

provide an equivalent current or voltage output signal for application to a controller,

computer, recorder, indicator or similar device.

The model 2808-41A accepts a two-wire or three-wire RTD sensor. It operates from a dc

supply (6 to 42 V Max.) and provides either a 1 to 5 Vdc output or a 4-20 mA output into a

250-ohm (minimum) load. The features of the model 2808-41A are identified in Tables 1-1

through 1-3.

Figure 1-1 - Series 2808-41A Temperature Transmitter

(without Loop Powered Indicator Option)

1-2 / Introduction 2808-41A

Transmitters typically include sensor assemblies. These assemblies, which are offered for a

variety of measurement applications, screw into the bottom .5 - 14 N.P.T. threaded opening

of the transmitter. The threaded opening will also accommodate sensor adapters with

adjustable compression fittings.

RTD transmitters require 100-ohm platinum resistance sensors (IEC 751 Class B); these

transmitters may be calibrated to any temperature range within the limits of -58° to 662° F

(-50° to +350° C).

General calibration adjustments are performed using zero and span potentiometers (15-

turn type). Course zero and span selections are made via two internal switches.

Figure 1-2 - 2808-41A -

Temperature Transmitter (Rear & Front)

with Loop Powered Indicator Option

2808-41A Introduction / 1-3

1.2 MODEL NUMBER IDENTIFICATION

A Data Plate affixed to the transmitter lists the complete model number. The complete

model number provides identification of the features and options. Table 1-1 provides a

model breakdown for the RTD transmitter.

TABLE 1-1 - Model Number Breakdown for RTD Transmitter

- Sample Model Number -

A = RTD MODULE

A

1 FIELD RANGABLE

Output Select - see Table 1-4

100 ohm PT.,

Per IEC 751 Class B

D

= WARNING PLATE (* = Any Selection)

B

C D

* * 0 NONE

0 1 1 RUSSIAN (Without Indication)

1 1 1 RUSSIAN (With Indication)

B = INDICATION (# = Any No.)

B

0 NONE

1 LOCAL DIGITAL INDICATION

E

= RTD OPTION (# = Any No., α = 1 or 2)

C

D F

0 0 # NONE

# 1 # GENERAL PURPOSE RTD - see Table 1-3

0 2 # SPRING LOADED RTD - see Table 1-3

α 2 1 SPRING LOADED RTD - *

C = CERTIFICATION

C

0 NONE

1 UL/CUL

Class I, Div. 1, Groups C & D, Exp.

Class I, Div. 2, Groups A, B, C & D

F

= EXTENSION/THERMOWELL OPTION

F

0 NONE

1 EXT./THERMOWELL - see Table 1-2

CERTIFICATION NOTES

In order to have UL/CUL Certification, a

Thermowell must be selected from Table

1-2. An extension is not permitted for

Certified models.

RTD NOTES

Table 1-2 = Extension & Thermowell Selections

Table 1-3 = RTD Length Selections

* For UL/CUL Certification, a Thermowell must be selected from Table 1-2. An Extension is not

permitted for UL/CUL Certified Models.

1-4 / Introduction 2808-41A

TABLE 1-2 - 2808-41A Extension & Thermowell Selection Options

- Attachment Table - A-BC-D-E-FG

- Attachment Number - 2808-W-

A

= EXTENSION TYPE

A

0 NONE

1 UNION

2 COUPLING

E

= THERMOWELL EXTERNAL THREAD

(# = 1 or 2)

D

E

0 0 NONE

#

1 0.500-14 N.P.T

# 2 0.750-14 N.P.T

# 3 1.000-11.5 N.P.T

B C = EXTENSION LENGTH

A

B C

0 0 0 NONE

1 2 5 3.0” Length - (Union)

2 2 5 3.0” Length - (Coupling)

1 3 0 3.5” Length - (Union)

2 3 0 3.5” Length - (Coupling)

1 3 5 4.0” Length - (Union)

2 3 5 4.0” Length - (Coupling)

1 4 0 4.5” Length - (Union)

2 4 0 4.5” Length - (Coupling)

1 4 5 5.0” Length - (Union)

2 4 5 5.0” Length - (Coupling)

1 5 0 5.5” Length - (Union)

2 5 0 5.5” Length - (Coupling)

1 5 5 6.0” Length - (Union)

2 5 5 6.0” Length - (Coupling)

1 6 0 6.5” Length - (Union)

2 6 0 6.5” Length - (Coupling)

1 7 0 7.5” Length - (Union)

2 7 0 7.5” Length - (Coupling)

1 8 0 8.5” Length - (Union)

2 8 0 8.5” Length - (Coupling)

1 9 0 9.5” Length - (Union)

2 9 0 9.5” Length - (Coupling)

See Table 2-2 - RTD Extension Table

F

G = THERMOWELL INSERTION LENGTH

D

E F G D E F G

1 1 0 4 2.5” Length *

1

1 1 1 2 10.5” Length *

1

1 2 0 4 2.5” Length *

2

1 2 1 2 10.5” Length *

2

1 3 0 4 2.5” Length *

3

1 3 1 2 10.5” Length *

3

2 2 0 4 2.5” Length *

4

2 2 1 2 10.5” Length *

4

2 3 0 4 2.5” Length *

5

2 3 1 2 10.5” Length *

5

1 1 0 5 3.5” Length *

1

1 1 1 5 13.5” Length *

1

1 2 0 5 3.5” Length *

2

1 2 1 5 13.5” Length *

2

1 3 0 5 3.5” Length *

3

1 3 1 5 13.5” Length *

3

2 2 0 5 3.5” Length *

4

2 2 1 5 13.5” Length *

4

2 3 0 5 3.5” Length *

5

2 3 1 5 13.5” Length *

5

1 1 0 6 4.5” Length *

1

1 1 1 8 16.5” Length *

1

1 2 0 6 4.5” Length *

2

1 2 1 8 16.5” Length *

2

1 3 0 6 4.5” Length *

3

1 3 1 8 16.5” Length *

3

2 2 0 6 4.5” Length *

4

2 2 1 8 16.5” Length *

4

2 3 0 6 4.5” Length *

5

2 3 1 8 16.5” Length *

5

1 1 0 7 5.5” Length *

1

1 1 2 1 19.5” Length *

1

1 2 0 7 5.5” Length *

2

1 2 2 1 19.5” Length *

2

1 3 0 7 5.5” Length *

3

1 3 2 1 19.5” Length *

3

2 2 0 7 5.5” Length *

4

2 2 2 1 19.5” Length *

4

2 3 0 7 5.5” Length *

5

2 3 2 1 19.5” Length *

5

1 1 0 9 7.5” Length *

1

1 1 2 4 22.5” Length *

1

1 2 0 9 7.5” Length *

2

1 2 2 4 22.5” Length *

2

1 3 0 9 7.5” Length *

3

1 3 2 4 22.5” Length *

3

2 2 0 9 7.5” Length *

4

2 2 2 4 22.5” Length *

4

2 3 0 9 7.5” Length *

5

2 3 2 4 22.5” Length *

5

1 1 1 0 8.5” Length *

1

0 0 0 0 N0NE

1 2 1 0 8.5” Length *

2

1 3 1 0 8.5” Length *

3

2 2 1 0 8.5” Length *

4

2 3 1 0 8.5” Length *

5

D = THERMOWELL TYPE

D

0 NONE

1 STEPPED

2 TAPERED

*

1

= Stepped Thermowell - .50 - 14 NPT

*

2

= Stepped Thermowell - .75 - 14 NPT

*

3

= Stepped Thermowell - 1.00 - 11.5 NPT

*

4

= Tappered Thermowell - .75 - 14 NPT

*

5

= Tappered Thermowell - 1.00 - 11.5 NPT

See Table 2-1 - Thermowell/RTD Combination Table

2808-41A Introduction / 1-5

TABLE 1-3 - 2808-41A RTD Length Selections

- Attachment Table - A

B

- Attachment Number - 2808-R-

RTD TYPE

&

LENGTH

Attachment #s * A B

(* = RTD Option)

(see Table 1-1)

RTD TYPE

&

LENGTH

Attachment #s * A B

(* = RTD Option)

(see Table 1-1)

GENERAL PURPOSE

2.5” Length

3.5” Length

4.5” Length

5.5” Length

6.5” Length

8.5” Length

9.5” Length

11.5” Length

14.5” Length

17.5” Length

20.5” Length

23.5” Length

*

A B

1 0 2

1 0 3

1 0 4

1 0 5

1 0 6

1 0 8

1 0 9

1 1 1

1 1 4

1 1 7

1 2 0

1 2 3

SPRING LOADED

2.5” Length

3.5” Length

4.5” Length

5.5” Length

6.5” Length

8.5” Length

9.5” Length

11.5” Length

14.5” Length

17.5” Length

20.5” Length

23.5” Length

*

A B

2 0 2

2 0 3

2 0 4

2 0 5

2 0 6

2 0 8

2 0 9

2 1 1

2 1 4

2 1 7

2 2 0

2 2 3

1.3 MODELS APPROVED FOR HAZARDOUS AREAS

Transmitter models certified for operation in hazardous areas by Underwriters

Laboratories (UL) will have the appropriate logo inscribed on the instrument data plate.

These models are intended for use in the following hazardous locations:

Explosion-proof for Class I, Division 1, Groups C and D. (Conduit Seals Not Required)

Nonincendive for Class I, Division 2, Groups A, B, C and D.

The National Electric Code, Article 500, defines the above classes and divisions as follows:

Class I Atmospheres: Contains flammable gases or vapors.

Class II Atmospheres: Contains combustible dust particles.

Division 1:

Where continuous exposure, or threat of fire or explosion may be present due to accident

or uncommon occurrence.

Division 2:

Where threat of fire or explosion is not normally present, and not likely to result from

abnormal occurrence.

Groups A through D:

Cover various flammable gases and liquids such as ethyl-ether vapor, gasoline, acetone,

etc.

BLANK PAGE

2808-41A Installation / 2-1

Section 2

INSTALLATION & SERVICE

2.1 INSTALLATION

Series 2808-41A Temperature Transmitters are provided with two .5 - 14 N.P.T. threaded

conduit openings. Either opening can be mated to an electrical conduit. Notice that these

threads are extra deep; it is essential that no less than five full threads of the conduit are

engaged. All fittings must be secure and the transmitter cover must be in place and properly

tightened before applying power.

In some applications, a remote RTD is interfaced to the transmitter. In these applications,

the sensor probe is installed at the process and is connected to the transmitter via wiring

run through the bottom of the transmitter’s housing (in conduit). The RTD sensor wiring is

connected to connector block P1 on the 1-5 Vdc or 4-20 mA RTD Sensor Interface Module.

This arrangement isolates the transmitter from the process environment and generally

provides more flexible service access. When using this approach, the sensor leads should not

be connected to the transmitter’s terminals until the probe has been secured and the

transmitter has been secured to the mounting conduit pipe; otherwise, the leads may twist

and break as the transmitter is tightened.

The RTD Sensor Interface Module is located behind the Temperature Transmitter’s Rear

Cover (see Figure 2-1).

In the case of units with built-in RTDs, the probe is screwed into the bottom of the

transmitter (the sensing port) as a unified assembly. This assembly can then be screwed

directly into the process pipe/fixture. In the case of the Spring Loaded RTD, the assembly

can be screwed directly into the process pipe/fixture, into an extension (that is mated to a

thermowell) or into a thermowell that is screwed in to the process pipe/fixture. While this

method provides a compact assembly, it should not be used on processes where the

measured temperature will exceed the temperature limits of the transmitter.

** WARNING **

Never mount a 2808-41A with an attached probe directly to a process pipe/fixture

having a temperature that will exceed the unit’s environmental specification.

Extremely high temperatures will affect transmitter accuracy and, if excessive,

could cause permanent damage. If the 2808-41A is wired to an unprotected control

loop, a failure of this type could result in property damage and injury to persons.

The sensor is installed so that the probe is in contact with the measure media (air, liquid,

gas, etc.). In situations where the media is of a substance that can cause destruction of the

probe material, the use of a protective well assembly is recommended. The selected well

material must be able to resist process corrosion and provide the necessary protection and

isolation for the probe. Wells must only be used with spring-loaded sensors to meet

requirements for equipment protection (see Figure 2-10 and Tables 2-1 & 2-2).

The electrical power connections are brought out through a threaded conduit port on the

side of the transmitter body. Remove the protective plastic shipping plug (if included) when

attaching the conduit. RTD wiring is always run through the bottom of the transmitter.

2-2 / Installation 2808-41A

2.2 FIELD WIRING NOTES

Improper wiring can cause equipment damage to equipment and electrical shock, or injury

to users. Only technically qualified persons should perform wiring and service procedures.

2.2.1 Electrical Ports

The transmitter contains a .50 - 14 N.P.T. electrical port that mates with the conduit pipe or

an appropriate threaded adapter.

** NOTE **

When installing the transmitter, the conduit connections

must be secured with no less than five threads fully engaged.

In some applications the conduit may be subject to condensation build-up that could seep

into the electrical housing. This situation can be remedied by installing the transmitter so

that it is above the level of the process connection. Any moisture will drain away from the

transmitter body via gravity feed.

2.2.2 Access to Field Wiring Terminals

Obtain access to the terminals by unscrewing the end cover and removing it. To facilitate

the removal of a tight cover, insert a flat metal bar or similar tool between the cover

protrusions and apply moderate leverage to loosen it; be sure to secure the transmitter body

so that excessive force is not transmitted from the bar to the conduit or process connection.

When replacing the cover, tighten it only by hand until all the threads are engaged and the

cover gasket is compressed.

2.2.3 Lead Dress

When bringing the signal leads through the conduit opening, do not dress them tightly to

the terminals. Provide about three inches of lead slack to reduce strain on the terminals and

make connections more manageable.

2.2.4 Recommended Wiring Practices

The following list should be checked when connecting the transmitter to a device.

A. Perform all wiring in accordance with the National Electrical Code.

B. Use two-wire, twisted pair with shield of suitable AWG size.

C. Ground the shield only at the input of the device to which the transmitter will be

connected.

D. Connect the green ground screw to an approved earth ground.

E. Run the instrument wiring in conduit approved for explosion-proof installations in

accordance with NEC and local authority.

F. Provide optional transient protection where applicable.

2808-41A Installation / 2-3

Figure 2-1 - RTD Inputs & Field Wiring

2-4 / Installation 2808-41A

2.2.5 Connecting Sensors

Series 2808-41A Temperature Transmitters are specified for use with RTD sensors. Figure

2-1 shows the method of connecting a 3-wire and 2-wire RTD bulb to a model 2808-41A. The

RTD sensor should be a 100-ohm platinum type that conforms to the IEC 751 Class B

specification.

2.2.6 Signal/Power Connections

The voltage applied across the transmitter must be maintained within 6 to 36 Vdc; the

maximum supply voltage is 42 Vdc (with a loop resistance as shown in Figures 2-2 & 2-3.

The use of two-wire, twisted-pair, shielded wiring is recommended for signal/power wiring.

Shielded wire will minimize signal errors caused by electromagnetic interference (EMI) and

radio frequency interference (RFI).

The shield should only be grounded at the power common return of the input device. Shields

should not be connected to ground at the transmitter or midpoint in the loop, as such

practices will introduce ground loops and cause signal errors.

2.2.7 Grounding

The transmitter is provided with a grounding screw as shown in Figures 2-1 and 2-2. This

screw must be connected to a reliable earth ground to minimize electrical interference and

to protect users from electrical shock.

2.3 WIRING OF 4-20mA SIGNAL/POWER LOOP

The 4-20mA signal/power loop can be powered in two ways. Figure 2-2 shows the loop

powered by the receiving device (controller, recorder, etc.), while Figure 2-3 shows the loop

powered by an external supply. In both instances, the 4-20mA current flows through a 250W

load resistor and develops a corresponding 1-5V input for the receiving device.

Signal Shielding: Use twisted wire, shielded cable covered by insulating material for the

signal/power wiring. When properly grounded, this cable will minimize pickup of elec-

tromagnetic, and radio frequency interference.

The shield lead of the cable is typically grounded at the input of the receiving device

(computer controller, recorder, etc.) as shown in Figures 2-2 and 2-3. Never connect the

other end of this shield to the transmitter enclosure or attempt to ground the shield at more

than one point along the wire path. Multiple grounds will cause signal errors at the input of

the receiving device.

Although it is recommended to connect the cable’s shield to the power common return of the

receiving device, the actual connection point may differ depending on the design and

application of the device. In some instances, better noise immunity can be had by connecting

the cable shield to the chassis or a designated shield terminal on the device. Check the

instruction manual of the receiving device for the recommended connection points.

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Remote Automation Solutions Bristol Series 2808 Temperature Owner's manual

Remote Automation Solutions Bristol Series 2808 Temperature Owner's manual

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