Dwyer Series HHT User manual

Brand: Dwyer

Model: Series HHT

Type: User manual

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#7(382099,7 takes accurate measurements in the harshest of

environments. The transmitter is offered in explosion-proof and

intrinsically-safe versions depending on the applications

requirements. The explosion-proof model is offered with 4 to 20

mA outputs for humidity only. The intrinsically-safe version is

offered with 4 to 20 mA output for humidity and temperature.

Both versions have an optional two line alphanumeric display to

show the current humidity and temperature.

The Series HHT humidity/temperature transmitter is excellent for

offshore HVAC applications, dust and grain applications.

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!,1(90;,:20+09>!(3.,0 to 100% RH.

#,25,7(9:7,!(3.,-40 to 140°F (-40 to 60°C).

**:7(*>±2% 10-90% RH, ±0.9°F at 72°F (±0.3°C at 25°C).

>89,7,808±1%.

!,5,(9()0109>±0.1% typical.

#,25,7(9:7,02098-40 to 140°F (-40 to 60°C).

"947(.,#,25,7(9:7,-40 to 176°F (-40 to 80°C).

425,38(9,+#,25,7(9:7,-40 to 140°F (-40 to 60°C).

4<,7!,6:07,2,398For intrinsically safe models HHT-IX, 9.5

to 28 VDC. For explosion-proof models HHT-EX, 16.5 to 28

VDC.

:95:9"0.3(14-20 mA, 2 channels for humidity/temperature

models (loop power on RH).

!,85438,#02,15 seconds.

1,*970*(1433,*90438Screw terminal block.

43+:09433,*90431/2 female NPT.

70-9<1% RH/year.

!",3847Capacitance polymer.

#,25,7(9:7,",3847Solid state band gap.

4:803.(9,70(1Aluminum.

0851(>Optional 2 line alpha numeric, 8 characters/line.

Temperature

display is °F/°C selectable.

0851(>!,841:9043RH: 0.1%: Temperature 0.1°F (0.1°C).

%,0./92 lb 8 oz (1134 g).

.,3*>5574;(18FM Approved to: XP-IS / I / 1 / BCD / T5 Ta

= -40°C to 60°C, DIP / II, III / T5 Ta = -40°C to 60°C; TYPE 4X,

IP66; IS / I, II, III / 1 / ABCDEFG / T4 Ta = -40°C to 60°C - 01-

001467-00; ENTITY; TYPE 4X, IP 66; I / 0 / AEx ia / IIC / T4 Ta =

-40°C to 60°C - 01-001467-00; ENTITY; TYPE 4X, IP 66, CE.

1/2 NPT

13-23/32

[

347.98]

4-15/32

[113.51]

2-23/32

[69.06]

3-29/32

[

99.22]

4-9/32

[108.74]

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749,*9043

Explosion-Proof

Intrinsically Safe

Explosion-Proof

Intrinsically Safe

,8*7059043

Humidity

Humidity/Temperature

Humidity

Humidity/Temperature

0851(>

Yes

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1. Install in accordance with any applicable national electric

code.

2. Plug unused conduit openings. Plug must engage a minimum

of 5 threads.

3. Use conduit seal within 18 inches of conduit entry.

4. Disconnect power before servicing.

. Control equipment voltage on hazardous side is 250 Vrms/DC

maximum.

6. Do not substitute any components. The intrinsic safety of the

sensor may be compromised.

7. Shielded cable for 4-20 mA loop is necessary to meet CE

requirements or when used in electrically noisy environments.

3909> (7(2,9,78

Vmax = 28 VDC

Imax = 100 mA

Ci = 62 nF

Li = 7.7 µH

Pi = 651 mW

IF SHIELDED CABLE IS USED FOR

4-20 mA LOOP, GROUND THIS SIDE

OF CABLE ONLY

4-20 mA

LOOP

SUPPLY

CONVERSION RESISTOR

50 OHMS

ON-HAZARDOUS SIDEHAZARDOUS SIDE

SHOWN TRANSPARENT

FOR CLARITY

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1. Remove power from the instrument before carrying out any

servicing.

2. Use only FM approved Associated Apparatus. When installing

the Associated Apparatus, the manufacturer’s instructions

must be followed.

3. The earth terminal on the housing must be wired to a local

arth ground in the hazardous area.

4. Refer to FM control drawing, Dwyer number 03-001467-00.

5. For Model HHT-IT, use ONLY

Pepperl + Fuchs KFDØ-SCS-

Ex1.55 Galvanically Isolated Barriers.

IF SHIELDED CABLE IS USED

GROUND THIS SIDE OF CABLE ONLY

I.S GROUND

TEMP.

RECEIVER

4-20 mA

LOOP SUPPLY

SHOWN TRANSPARENT

FOR CLARITY

ECEIVER

MODEL HHT-IT

MODEL HHT-IT, RH AND TEMP.

INTRINSICALLY SAFE WIRING

EXAMPLE USING PEPPERL + FUCHS

BARRIER SYSTEM

AZARDOUS SIDE

OTE! THE PEPPERL +

UCH KFD0-SCS-Ex1.55

ARRIERS ARE

ALVANICALLY ISOLATED,

O GROUNDING IS NOT

EQUIRED.

ON-HAZARDOUS SIDE

KFD0-SCS-Ex1.55

MODEL HHT-IU

IF SHIELDED CABLE IS USED,

GROUND THIS SIDE OF CABLE ONLY

I.S GROUND

HAZARDOUS SIDE NON-HAZARDOUS SIDE

SHOWN TRANSPARENT

FOR CLARITY

4-20 mA

LOOP SUPPLY

MODEL HHT-IU, RH ONLY

INTRINSICALLY SAFE WIRING

EXAMPLE USING MTL BARRIER

SYSTEM

MTL7787+

RECEIVER

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The maximum DC Power Supply is 28 VDC. The minimum

required DC Power Supply required is based upon the following:

.Minimum DC voltage requirement of the Model HHT.

2.Total load resistance.

3.Total leadwire resistance.

4.Zener barrier voltage drop ( Model HHT-IX only).

The formula for calculating the DC Power Supply is:

VDC = VHHT + VLOAD + VLEADWIRE + VBARRIER

Where VHHT = 9.5v for Models HHT-IX and 16.5v for Models

HT-EX.

VLOAD = Total load resistance X 20mA

VLEADWIRE = Total leadwire resistance X 20mA

VBARRIER = 8.1v

(Typical zener barrier voltage drop for this application)

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Step 1. VHHT = Minimum voltage required by

Model HHT-EX = 16.5 v

Step 2. Calculate VLOAD. Using the industry standard

250 OHM conversion resistor, VLOAD =

250 X 20mA = 5v.

Step 3. Calculate VLEADWIRE. For this example assume

a leadwire resistance of 10 OHMS.

VLEADWIRE = 10 X 20mA = 0.2v

Step 4. VDC = VHHT + VLOAD + VLEADWIRE =

16.5 + 5 + 0.2 = 21.2v

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Step 1. VHHT = Minimum voltage required by Model HHT-

IX = 9.5 v

Step 2. Calculate VLOAD. Using the industry standard

250 OHM conversion resistor, VLOAD =

250 X 20mA = 5v.

Step 3. Calculate VLEADWIRE. For this example assume

a leadwire resistance of 10 OHMS.

VLEADWIRE = 10 X 20mA = 0.2v

Step 4. VBARRIER = 8.1v

Step 5. VDC = VHHT + VLOAD + VLEADWIRE +

VBARRIER = 9.5 + 5 + 0.2 +8.1 = 22.8v

For Model HHT-IT, follow instructions with Pepperl + Fuchs

KFDØ-SCS-Ex1.55 Barrier.

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Upon final installation of the Series HHT Hazardous Area

Humidity / Temperature Transmitter, it is important to develop a

routine schedule for replacing the RH/Temperature Sensor P/N

A-451. The sensor should be replaced annually or sooner

depending on environmental conditions. A periodic check of

system calibration is recommended. The Series HHT is not field

serviceable and should be returned if repair is needed (field

repair should not be attempted and may void warranty). Be sure

to include a brief description of the problem plus any relevant

application notes. Contact customer service to receive a return

goods authorization number before shipping.

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4*(9043 Select a location where the ambient temperature is

between –40 to +140°F (-40 to +60°C)

4809043 The transmitter is not position sensitive. Units with the

optional display should be mounted for ease of viewing the

display.

(:9043 Use electrostatic discharge precautions (e.g. use of

rist straps) during installation and wiring to prevent equipment

damage.

Avoid locations where severe shock or vibration, excessive

moisture or corrosive fumes are present.

Do not exceed ratings of this device. Permanent damage not

covered by the warranty may result.

0851(> The temperature indicated on the display, if equipped

with the LCD option, is field selectable via a jumper located on

the circuit board just above the display. To change the jumper

position, remove the housing cover and position the jumper for

°F or °C according to Figure 4.

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Replacement sensors are available. No calibration is required

when a new sensor is installed. To replace the sensor, remove

the sintered filter. When installing the new sensor, make sure the

4 pin male connector is aligned correctly with the female

connector. See Figure 5.

To order a replacement sensor or sintered filter, contact Dwyer

sales. The part numbers are:

Replacement 2% sensor : A-451

Replacement sintered filter: A-450

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CORRECT ALIGNMENT

OF SENSOR ASSEMBLY

INCORRECT ALIGNMENT

OF SENSOR ASSEMBLY

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1. THE INTRINSIC SAFETY ENTITY CONCEPT ALLOWS THE INTERCONNECTION OF TWO FM APPROVED INTRINSICALLY SAFE

DEVICES WITH ENTITY PARAMETERS NOT SPECIFICALLY EXAMINED IN COMBINATION AS A SYSTEM WHEN:

2. EQUIPMENT CONNECTED TO THE ASSOCIATED APPARATUS MUST NOT USE OR GENERATE MORE THAN 250 Vrms OR VDC

3. DIVISION 1 HAZARDOUS (CLASSIFIED) LOCATIONS INSTALLATIONS MUST BE IN ACCORDANCE WITH THE NATIONAL ELECTRICAL CODE NFPA 70, ARTICLE 504;

4. NO REVISIONS WITHOUT PRIOR APPROVAL FROM FM RESEARCH.

5. THE ASSOCIATED APPARATUS MANUFACTURERS INSTALLATION INSTRUCTIONS MUST BE FOLLOWED WHEN INSTALLING THIS EQUIPMENT.

6. DUST TIGHT CONDUIT SEAL MUST BE USED IN CLASS II AND CLASS III ENVIRONMENTS.

FM CONTROL DRAWING

CATALOG NUMBERS:

HHT-IU AND HHT-IT

HHT SERIES

TRANSMITTER

Vmax=28VDC

Imax=100mA

Ci = 62nF

Li = 7.7 H

Pi = 651mW

HAZARDOUS (CLASSIFIED) LOCATION

INTRINSICALLY SAFE FOR:

CLASS I DIV. 1 GROUPS A, B, C, D

CLASS II DIV. 1 GROUPS E, F, G

CLASS III DIV. 1

T4 Ta = -40°C TO 60°C TYPE 4X, IP 66

COM

TEMPERATURE

GROUND CONNECTION

FM APPROVED

ASSOCIATED APPARATUS

GROUND CONNECTION

NON-HAZARDOUS LOCATION

I.S. SAFETY GROUND

OPTIONAL SHIELD

T4 Ta = -40°C TO 60°C TYPE 4X, IP 66

Voc OR Uo OR Vt Vmax, Isc OR Io OR It Imax, Ca OR Co Ci + Ccable, La OR Lo Li + Lcable, Po Pi

NOTICE: This drawing and the principles and elements of design embodied therein are the exclusive property of DWYER INSTRUMENTS, INC. and are not

to be communicated, disclosed, reproduced or used except as previously authorized in writing by such corporation and must not be submitted to outside

parties for examination without the written consent of said corporation.

NO. CHANGES BY/DATE

NAME

APPD

CHKD

DWN BY

DATE

STANDARD TOLERANCES UNLESS NOTED:

MICHIGAN CITY, INDIANA 46360 U.S.A.

ACAD2002

FINISH

MATERIAL

ALL DECIMAL DIMENSIONS ±

CD = CRITICAL DIMENSION

ALL ANGLES ±

03-001467-00

3-001467-00

08-25-08

KAS

CAT

LRR

FM CONTROL DRAWING

HHT-IU AND HHT-IT

SCALE 1:2

UPDATED PER DWK 6-12-14, ECR 35480

PFA

6-23-14

1°

.005

PROBE TUBE

UP TO LINE

IS NOT

NEMA 4X

IP66

HOUSING ABOVE

THIS LINE IS

NEMA 4X IP66

CLASS I, ZONE 0, GROUPS IIC

ZONE 0 HAZARDOUS LOCATIONS MUST BE IN ACCORDANCE WITH THE NATIONAL ELECTRICAL CODE NFPA 70, ARTICLE 505. ALL INSTALLATIONS MUST BE

IN ACCORDANCE WITH ISA RP-12.6.

7. WARNING - ENCLOSURE PARTS ARE CONSTRUCTED OF ALUMINUM. ENCLOSURE MUST BE PROTECTED FROM MECHANICAL FRICTION AND IMPACT WITH

IRON/STEEL TO PREVENT IGNITION CAPABLE SPARKS.

8. SUBSTITUTION OF PARTS MAY IMPAIR INTRINSIC SAFETY. RETURN TO MANUFACTURER FOR ANY REPAIRS.

9. ADDITIONAL SUFFIX LCD (LCD DISPLAY) DOES NOT IMPAIR INTRINSIC SAFETY.

Dwyer Series HHT User manual

Dwyer Series HHT User manual

Dwyer Series HHT User manual

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