Sierra Monitor 4501-XX Electrochemical 2-Wire Toxic Gas Sensor Owner's manual

Sierra Monitor
Brand
Sierra Monitor
Model
4501-XX Electrochemical 2-Wire Toxic Gas Sensor
Category
Carbon monoxide (CO) detectors
Type
Owner's manual

This manual is also suitable for

Manual # T13022
Document Revision: C2
Model 4501-XX
2-Wire Series
Toxic Gas Sensor Module
APPLICABILITY & EFFECTIVITY
Effective for all Model 4501-XX Modules manufactured after September 2018.
4501-03 4501-04 4501-05 (FM Approved) 4501-06 4501-08
4501-10 4501-12 4501-25 4501-26
Model 4501-XX Toxic Gas Sensor Module
Contact Information
©2018 Sierra Monitor Corporation. All rights reserved.
Manual Number: T13022
This manual contains intellectual property that was developed by Sierra Monitor Corporation and is
protected by the copyright laws of the United States, international copyright treaties, and all other
applicable national laws. This manual contains information regarding technology that is protected under
one or more issued or pending United States and foreign patents.
Sierra Monitor and Sentry IT are trademarks of Sierra Monitor Corporation. All other trademarks are the
property of their respective owners.
This manual is licensed to users of Sierra Monitor products and may be copied, in whole or in part.
The offices of Sierra Monitor are located at:
Sierra Monitor Corporation
1991 Tarob Court
Milpitas, CA 95035
USA
Customer Service:
Telephone: (408) 964-4443
Fax: (408) 262-9042
Toll-Free: (800) 727-4377
Email: support@sierramonitor.com
Website: www.sierramonitor.com
Model 4501-XX Toxic Gas Sensor Module
FM Information
FM PERFORMANCE APPROVAL
ONLY THE FOLLOWING ITEMS, FUNCTIONS AND OPTIONS ARE FM* APPROVED
Model 4501-05 Hydrogen Sulfide Gas Sensor Module
Sensor Module
Model 4501-05
Sensor Module - Hydrogen Sulfide
Calibration Equipment
Model 1250-01
Gas Sensor Calibration Kit, Type A
Model 1260-05
Hydrogen Sulfide in N2, 25 ppm Gas Cylinder
Model 1260-45
Hydrogen Sulfide in N2, 10 ppm Gas Cylinder
Model 5358-01
Calibration Adapter
Notes:
1) Apparatus must be installed in accordance with National Electrical Code.
2) FM Comments
*FM Approvals, a subsidiary of FM Global
Project# 3028099
Specific Conditions of Use:
- Consult the original manufacturer for information on the dimensions of the flameproof
joints.
- Appropriate certified cable glands for direct entry must be used.
Model 4501-XX Toxic Gas Sensor Module
Table of Contents
TABLE OF CONTENTS
TABLE OF CONTENTS .............................................................................................................................................4
LIST OF FIGURES .....................................................................................................................................................6
1 PRODUCT DESCRIPTION .................................................................................................................................7
1.1 General .........................................................................................................................................................7
1.2 Mounting Configuration ................................................................................................................................7
1.3 Theory of Operation .....................................................................................................................................8
1.4 Mechanical ...................................................................................................................................................8
1.4.1 Enclosure ..............................................................................................................................................8
1.4.2 Transmitter Electronics ...................................................................................................................... 10
1.4.3 Sensor Assembly ............................................................................................................................... 10
1.5 Interconnected Wiring ............................................................................................................................... 10
1.6 Power Requirements ................................................................................................................................. 10
2 CAUTIONS AND WARNINGS ......................................................................................................................... 11
2.1 Introduction ................................................................................................................................................ 11
2.2 Gas Sensor Modules – General ................................................................................................................ 11
2.3 Wiring ........................................................................................................................................................ 11
2.4 Calibration Frequency ............................................................................................................................... 11
3 QUICK START ................................................................................................................................................. 12
3.1 Overview ................................................................................................................................................... 12
3.2 Wiring ........................................................................................................................................................ 12
3.3 Module Installation .................................................................................................................................... 12
3.4 Transmitter Installation .............................................................................................................................. 12
3.5 Start-Up & Operation ................................................................................................................................. 12
3.6 Zero Stabilization ...................................................................................................................................... 12
4 INSTALLATION ............................................................................................................................................... 13
4.1 Sensor Module Locations .......................................................................................................................... 13
4.2 Wiring ........................................................................................................................................................ 14
4.3 Enclosure Installation ................................................................................................................................ 14
4.4 Transmitter and Sensor Installation .......................................................................................................... 15
5 OPERATION .................................................................................................................................................... 16
5.1 Introduction ................................................................................................................................................ 16
5.2 Data Entry Keypad .................................................................................................................................... 16
5.3 Main Menu ................................................................................................................................................. 17
5.4 Setup Sub-Menu ....................................................................................................................................... 18
5.5 Maintenance Sub-Menu ............................................................................................................................ 19
6 CALIBRATION ................................................................................................................................................. 20
6.1 Calibration Frequency ............................................................................................................................... 20
6.2 Calibration Preparation ............................................................................................................................. 20
6.3 Calibration Gas Delivery Methods............................................................................................................. 20
6.4 Sensor Exposure to Gas ........................................................................................................................... 21
6.5 Calibration Sub-Menu ............................................................................................................................... 21
APPENDIX A. SERVICE ......................................................................................................................................... 23
Appendix A.1. Sensor Module Configuration ....................................................................................................... 23
Appendix A.2. Enclosure Replacement ............................................................................................................... 23
Appendix A.3. Transmitter Replacement ............................................................................................................. 24
Appendix A.4. Sensor Replacement .................................................................................................................... 24
Appendix A.5. Installation Inspection ................................................................................................................... 24
Appendix A.5.1. Controller Installation ............................................................................................................. 24
Appendix A.5.2. Cabling Installation ................................................................................................................ 24
Appendix A.5.3. Sensor Module Installation .................................................................................................... 25
Appendix A.5.4. Moisture Traps And Rainshields ............................................................................................ 25
Model 4501-XX Toxic Gas Sensor Module
Table of Contents
Appendix A.5.5. Standard Voltages ................................................................................................................. 25
Appendix A.6. Inspection and Troubleshooting Guide......................................................................................... 25
Appendix A.6.1. Module Does Not Respond to Gas ........................................................................................ 25
Appendix A.6.2. The Module Displays “Starting” for More Than 1 Hour .......................................................... 25
Appendix A.6.3. The Module Does Not Display The Correct PPM .................................................................. 25
Appendix A.6.4. The Display Shows ‘F’ OR “NO SENSOR” ............................................................................ 25
Appendix A.6.5. The Display Shows ‘C’ ........................................................................................................... 25
APPENDIX B. SPECIFICATIONS .......................................................................................................................... 26
APPENDIX C. MODEL NUMBERS & PARTS LIST ............................................................................................... 29
APPENDIX D. LIMITED WARRENTY .................................................................................................................... 30
APPENDIX E. 4501-25 & 4501-26 GAS SENSOR MODULE ................................................................................ 31
APPENDIX F. US FM APPROVAL ......................................................................................................................... 35
APPENDIX G. APPENDIX F. CANADIAN FM APPROVAL .................................................................................. 37
APPENDIX H. ATEX CERTIFICATE ...................................................................................................................... 40
APPENDIX I. PIPE MOUNTING FOR 4501-XX ALUMINUM ................................................................................. 41
Model 4501-XX Toxic Gas Sensor Module
List of Figures
LIST OF FIGURES
Figure 1: Model 4501-XX Hydrogen Sulfide Gas Sensor Module – Mounting Options .............................................8
Figure 2: Model 4501-05-S1/S2/A2 Toxic Gas Sensor – Stainless Steel/Aluminum Enclosure, Dimensions ...........9
Figure 3: Model 4501-05-A1 Toxic Gas Sensor – Cast Aluminum Enclosure, Dimensions ......................................9
Figure 4: Specific Gravities ...................................................................................................................................... 13
Figure 5: Typical Mounting Options ......................................................................................................................... 13
Figure 6: 4-20 mA Connection ................................................................................................................................. 14
Figure 7: Connector Locations ................................................................................................................................ 15
Figure 8: Face Plate with Operator Keypad ............................................................................................................ 16
Figure 9: Master Menu............................................................................................................................................. 17
Figure 10: Operation Display Values ....................................................................................................................... 17
Figure 11: Set-Up Configuration .............................................................................................................................. 18
Figure 12: Maintenance Sub-Menu ......................................................................................................................... 19
Figure 13: Model 5358-01 Calibration Adapter ....................................................................................................... 20
Figure 14: Calibration Sub-Menu ............................................................................................................................. 21
Figure 15: Module Components .............................................................................................................................. 23
Figure 16: Electrolyte Replacement ........................................................................................................................ 31
Figure 17: Sensor Assembly – Exploded View ....................................................................................................... 33
Figure 18: Model 4501-25-A1 and Model 4501-26-A1 ............................................................................................ 34
Figure 19: Model 4501-25-S1 and Model 4501-26-S1 ............................................................................................ 34
Figure 20: Model 4501-XX-A1 Aluminum Enclosure Pipe Mount ........................................................................... 41
Figure 21: Pipe Mount Bracket for 4501-XX-A1 Aluminum Enclosure .................................................................... 41
Model 4501-XX Toxic Gas Sensor Module
Page 7 of 41
1 PRODUCT DESCRIPTION
1.1 General
The Model 4501-XX Toxic Gas Sensor Module is a 2-wire transmitter with 4-20 mA output and it offers a broad
array of features including:
• 2-wire loop powered
• 180 day calibration interval
• Selectable ranges (if appropriate for gas type)
• Non-intrusive one-person calibration
• Integral LCD 2-line, 20-character display
• Stainless steel enclosure and sensor housing
• 4-20 mA output
• Long sensor life
• Rotatable faceplate enables multidirectional conduit installation.
The 4501-XX is designed and approved for installation and operation in
hazardous locations.
Members of the 4501-XX Two-Wire Toxic Gas family include:
• 4501-03 Oxygen Gas Sensor Module
• 4501-04 Carbon Monoxide Gas Sensor Module
• 4501-05 Hydrogen Sulfide Gas Sensor Module
• 4501-06 Chlorine Dioxide Gas Sensor Module
• 4501-08 Chlorine Dioxide Gas Sensor Module
• 4501-10 Sulfur Dioxide Gas Sensor Module
• 4501-12 Nitrogen Dioxide Gas Sensor Module
• 4501-25 Ammonia Gas Sensor Module
• 4501-26 Hydrogen Fluoride Gas Sensor Module
1.2 Mounting Configuration
Various module mounting configurations can be implemented without special fixtures. Where applicable, these
options are factory configured prior to shipment. Mounting configuration can be selected by the installer or field
technician and are fully described in this manual. Sensor must always be oriented downward.
Model 4501-XX Toxic Gas Sensor Module
Page 8 of 41
1.3 Theory of Operation
Electrochemical sensors are fuel cell-like devices consisting of an anode, cathode and electrolyte. The
components of the cell are selected so a subject gas, allowed to diffuse into the cell, will cause a chemical
reaction and generate a current. The cells are diffusion limited so the rate the gas enters the cell is solely
dependent on the gas concentration. The current generated is proportional to the rate of consumption of the
subject gas in the cell.
Sierra Monitor electrochemical sensors provide improved reliability by allowing the gas to diffuse into the sensor
through a capillary port, rather than diffusing through membranes. The result is an extremely stable sensor with
very low temperature and pressure coefficients and the capability to monitor gas as ppm.
1.4 Mechanical
The sensor module is comprised of the following three primary components:
1.4.1 Enclosure
Explosion proof, rain-tight aluminum or stainless steel electrical (Figure 2 & Figure 3) housing with three ¾”
FNPT conduit hubs. The enclosure cover has a viewing window. The 3 conduit hubs combined with the rotatable
faceplate enable the user to mount the module in a variety of configurations (Figure 1).
NOTE: Module installation must be such that it is mounted vertically with sensor pointing downward.
Figure 1: Model 4501-XX Hydrogen Sulfide Gas Sensor Module – Mounting Options
Model 4501-XX Toxic Gas Sensor Module
Page 9 of 41
Figure 2: Model 4501-05-S1/S2/A2 Toxic Gas Sensor – Stainless Steel/Aluminum Enclosure, Dimensions
Figure 3: Model 4501-05-A1 Toxic Gas Sensor – Cast Aluminum Enclosure, Dimensions
Model 4501-XX Toxic Gas Sensor Module
Page 10 of 41
1.4.2 Transmitter Electronics
Electronic Assembly consisting of one printed circuit board assembly mounted under a cover plate. Wiring
connections for power and signal interface are located on the back side of the display.
1.4.3 Sensor Assembly
The sensor assembly includes a stainless steel, explosion proof, housing containing the gas sensor and a wiring
harness for connection to the transmitter. The sensor assembly threads into one hub of the enclosure. The
exposed end of the sensor assembly is threaded to allow connection of a rain-shield or calibration gas delivery
fitting.
1.5 Interconnected Wiring
Not supplied with the sensor module, but necessary to the installation and operation is the two conductor wiring
shielded which connects the module to its power source and controller. Before this wiring is installed it is
important to read and understand the control system installation instructions to determine wiring requirements and
alternatives.
1.6 Power Requirements
The 4501-XX module operates on DC power between 14 VDC and 30 VDC. The DC power must be supplied by
the loop controller.
Model 4501-XX Toxic Gas Sensor Module
Page 11 of 41
2 CAUTIONS AND WARNINGS
2.1 Introduction
Although the 4501-XX Gas Sensor Module is designed and constructed for installation and operation in industrial
applications including hostile environments, caution should be taken to insure that the installation is made in
compliance with this instruction manual and that certain procedures and conditions are avoided. This chapter
discusses the necessary cautions. Read the entire chapter prior to installation of the equipment.
2.2 Gas Sensor Modules – General
Avoid installing sensor modules where they will be unnecessarily exposed to wind, dust, water (i.e. direct hose
down), shock, or vibration. Observe temperature range limitations.
Sensors may be adversely affected by prolonged exposure to certain materials. Loss of sensitivity or corrosion,
may be gradual if such materials are present in low concentrations. These materials include: Halides (compounds
containing chlorine, fluorine, bromine, iodine), acid vapors, caustic liquids or mists.
Care has been taken by the manufacturer to ship modules in protective packaging to avoid contamination prior to
installation. It is recommended that the modules remain protected during installation and that the covering be
removed immediately prior to system start up.
During normal use the O
2
, CO, H
2
S, SO
2
, and NO
2
sensors are protected from dirt and oil contamination by a
sintered metal cover. If this cover becomes clogged, the response of the sensor will be reduced. Protect the
sensor from contamination by careful placement, or by use of rain shields and dust shields.
Sensor modules must not be painted. Paint may contain compounds which will contaminate the sensor. Paint will
cause clogging of the sintered metal cover and will cause difficulties during attachment of the calibration head or
other maintenance activity. It is recommended that the module be tagged “DO NOT PAINT”.
2.3 Wiring
The manufacturer recommends that extra caution be taken where the installation is near any sources of
electromagnetic or radio frequency interference. Precautions include:
• Avoid running sensor module cable close to high power cables, radio transmission lines, or cables subject
to pulses of high current.
• Avoid running cables near large electric motors or generators.
• Analog devices require shielded cable.
• In conduit installations and cable applications the shield should be connected to instrument ground.
• All splices must be via either a termination hardware system or soldered. Improperly spliced cable can
result in corrosion, resistance changes and system errors.
NOTE: Installation and wiring must be in accordance with the National Electrical Code. Voltage AC
conductors are not to be run in the same conduit as voltage DC conductors.
2.4 Calibration Frequency
The 4501-XX calibration frequency is six months (180 days). However, prudent gas detector maintenance
practices normally suggest a simple recalibration following incidences of exposure to high levels of gas that would
lead to alarm activation within any system utilizing the output of the gas sensor module.
Model 4501-XX Toxic Gas Sensor Module
Page 12 of 41
3 QUICK START
3.1 Overview
The gas sensor module has been supplied factory calibrated and ready for immediate installation and operation.
An installer familiar with installation and operation of gas detection products can use this section to begin
immediate use of the module.
3.2 Wiring
Provide two conductor twisted shielded wiring from the power supply/control device to the sensor module location.
Use wire that is 18 AWG or larger.
3.3 Module Installation
The 4501-XX can be mounted in a variety of configurations supported by the conduit. See Figure 2 to determine
which configuration is best for your specific application. The default configuration enables the modules to be put in
line with other modules with the sensor element below the transmitter. To change the configuration simply remove
the transmitter and rotate to the appropriate configuration and remount the standoffs and transmitter.
The module is designed to be installed on a ¾” conduit. Three important warnings:
• The installation must meet any hazardous environment codes for electrical equipment.
• The sensor module enclosure mounting must be spaced far enough from any vertical surface to allow
removal and replacement of the sensor assembly which is threaded into one ¾” conduit entry.
• Sensor housing must be oriented vertically pointing downward.
3.4 Transmitter Installation
To install the transmitter printed circuit assembly into the housing, carefully turn the faceplate so that the printing
is in the correct horizontal position for the mounting configuration and slide the assembly over the two stand-offs
in the enclosure. Hand tighten the two captive panel thumb screws into the stand-offs. Replace the enclosure
cover prior to providing power to the transmitter.
NOTE: For transmitters installed in classified hazardous areas, replace the threaded cover prior to
providing power.
3.5 Start-Up & Operation
To begin operation of the sensor module activate the instrument loop with 14-30 VDC. Each time the sensor
module is powered up it will perform a warm-up for approximately 1.0 minutes (60 seconds). During this time the
display will read “Starting”. The loop output will be held at 4 mA.
NOTE: If the sensor is uncalibrated, the startup display will state “UNCALIB” instead of “STARTING”.
NOTE: The 4501-06, 4501-08, 4501-25 and 4501-26 require 300 seconds warm-up period.
After the warm-up period has expired, the display will indicate the gas concentration. Also, the instrument loop will
be released to output current in the range of 4 to 20 mA. The actual current is linear with the gas concentration
and depends on the selected range. For instance, when the range of 0 to 50 PPM has been selected, a current of
4 mA corresponds to 0 PPM and a current of 20 mA corresponds to 50 PPM.
3.6 Zero Stabilization
All electrochemical sensors require at least 30 minutes on power prior to calibration. This allows the electrode
potentials to equilibrate, resulting in a stable zero signal level.
Model 4501-XX Toxic Gas Sensor Module
Page 13 of 41
4 INSTALLATION
4.1 Sensor Module Locations
The gas sensor module utilizes a diffusion type sensor which should
be located close to either the expected source or destination of the
gas hazard. If the gas is heavier than air, the sensor module should
be installed within 24 inches of the ground or floor. If it is lighter than
air, move it above 6’.
After optimum locations are determined based on the above
recommendations, consideration should be given to placing the
sensor modules in locations which are accessible for calibration
service. Slight adjustments to the location of the sensor module may
have little impact on effectiveness but major effect on accessibility.
• Modules should be placed in areas accessible for calibration.
• The cover should face out from the wall for easy access.
• Sensors should be pointed down and the conduit should include an inverse trap to reduce moisture
(condensation) from accumulating in the electronics enclosure.
Gas
Specific Gravity
Air
1.00
CO
0.97
H
2
S
1.19
Cl
2
2.49
ClO
2
3.09
SO
2
2.26
NO
2
1.59
NH
3
0.60
HF
1.86
Figure 4: Specific Gravities
Figure 5: Typical Mounting Options
Model 4501-XX Toxic Gas Sensor Module
Page 14 of 41
4.2 Wiring
• Wire should be 18 AWG minimum at a maximum distance is 5,000 feet. Install conduit as required by
local code or construction specifications.
• See Figure 6 for typical 2 terminal and 4 terminal connections.
4.3 Enclosure Installation
To protect the transmitter and sensor assembly they should be removed from the enclosure and preserved until
final installation and wiring termination.
Prior to installation and wiring:
1. Remove the transmitter from the module housing.
a. Unscrew the two captive panel screws on the faceplate.
b. Lift the transmitter out of the enclosure.
c. Unplug the sensor cable from transmitter connector J1.
d. Remove the sensor assembly from the enclosure hub.
2. Install the module enclosure onto the end of the supply conduit and/or bolt into position as required.
NOTE: When enclosure earth grounding is required for the installation a grounding lug is located in the
base of the enclosure. Install the earth ground under the green ground screw.
Figure 6: 4-20 mA Connection
Model 4501-XX Toxic Gas Sensor Module
Page 15 of 41
4.4 Transmitter and Sensor Installation
When all pre-wiring is complete:
1. Install sensor assembly in the open hub on the module enclosure. The sensor assembly thread must be
fully seated into the hub and tightened to maintain explosion proof assembly.
2. Connect the sensor assembly cable to transmitter connector J1. (Figure 7)
3. Connect the loop wires (Loop + and Loop -) to transmitter connector P1 4-20 mA + and – (Figure 7).
NOTE: Conductor P1 is removable.
4. Carefully return the transmitter to the enclosure installing it over the two standoffs. Finger tighten the
retaining screws into the standoffs.
Loop Power
Sensor
Connector
Figure 7: Connector Locations
Model 4501-XX Toxic Gas Sensor Module
Page 16 of 41
5 OPERATION
5.1 Introduction
The 4501-XX Toxic Gas Sensor Module utilizes a visual menu system operated by means of a magnet with the
cover in place. A magnet stick is supplied for this purpose. Access the menu system to calibrate the sensor
module, and for maintenance and diagnostic procedures.
The following adjustments can be made to the sensor module:
⧫ Range adjustments (Section 5.4)
⧫ 4mA and 20mA calibration adjustments (Section 5.4)
⧫ Span adjustment (Section 6.3)
5.2 Data Entry Keypad
The module menu system is operated by means of directing the magnet stick toward each of four independent
hall-effect magnetic switches. Each switch functions as if it is a manually activated panel key. The keys are
located under the faceplate above and below the LCD and are labeled M , E , and as shown in Figure 8.
Figure 8: Face Plate with Operator Keypad
Model 4501-XX Toxic Gas Sensor Module
Page 17 of 41
5.3 Main Menu
Key
Function
Display
Description
Reference
M
E
Mode
Switch [M]
▲
▼
M
E
Enter
Switch [E]
▲
▼
M
E
Up
Switch [▲] Previous Menu
▲
▼
M
E
Down
Switch [▼] Next Menu
▲
▼
CAL 180
First screen at power up: Model No. and days to calibration
Version
Second screen at power up: Version No. (e.g. V300aA)
STARTING
Third screen at start up, will remain for 60 seconds
XXX PPM
Normal condition - default display
M
E
Mode
CALIB:
Mode Function - Calibrate
Figure 14
▲
▼
M
E
Down
SETUP:
Mode Function - Set up alarms, relays, etc.
Figure 11
▲
▼
M
E
Down
MAINT:
Mode Function - Maintenance
Figure 12
▲
▼
M
E
Down
EXIT-?
Exit Mode
▲
▼
Figure 9: Master Menu
The table below defines the key operational displays on the operator interface.
Display
Description
- H2S –
STARTING
Warm-up at start-up (example from 4501-05)
SENSOR
FAIL
Sensor failure
NO
SENSOR
Sensor not found or plugged in
C.## PPM
Calibration Mode
F.## PPM
Failure detected, sensor is attempting recovery
XXX
DONE
Finished with step
Figure 10: Operation Display Values
Model 4501-XX Toxic Gas Sensor Module
Page 18 of 41
5.4 Setup Sub-Menu
The sensor module set-points menu is used to initially set-up the range and 4-20 mA calibration.
• Range: Once the Set-up menu is selected, press key [▼] twice and press [E] to activate the Range Set-up
menu. Use the [▲] or [▼] keys to select Range menu and press [E]. When “Range” is selected menu
provides any choices of ranges available for the gas type selected. Use the [▲] or [▼] keys to select the
desired range. If the “User” range is selected, use the [▲] or [▼] keys to adjust the high end of the range
desired. See specifications below for optional ranges.
Factory Range Set-up
Model
Range
Other Available
4501-03
5-25%
0-25%
4501-04
0-500 PPM
Variable
4501-05
0-100 PPM
Variable
4501-06
0-10 PPM
None
4501-08
0-3 PPM
None
4501-10
0-100 PPM
Variable
4501-12
0-20 PPM
None
4501-25
0-100 PPM
Variable
4501-26
0-10 PPM
None
• 4-20mA: Once the Set-up menu is selected, press key [▼] three times and press [E] to activate the 4-
20mA Set-up menu. Use the [▲] or [▼] keys to select Calib menu and press [E]. The “Calib” section of the
menu allows the user to calibrate the 4 mA and 20 mA outputs. To calibrate the 4 mA and 20 mA outputs it
is necessary to have an amp meter connected to the 4501-XX and upon selecting the 4 mA output
calibration then the [▲] or [▼] keys can be used to adjust the 4 mA reading on the amp meter until it reads
4 mA. Similar steps can then be performed for the 20 mA output.
Key
Function
Display
Description
Reference
XX PPM
Default Display (example 4501-05)
M
E
Mode
CALIB:
▲
▼
M
E
Down
SETUP:
▲
▼
Gas Range Adjustment Example
M
E
Enter
Range
S.P. Function - Range Adjust
▲
▼
M
E
Enter
*100 PPM
Select [E] to select or ▲ or ▼ to select another and press [E]
▲
▼
M
E
Down
10 PPM
Press [E] if selecting 0-10 PPM range
▲
▼
M
E
Down
USER
Press [E] if selecting user adjustable range
▲
▼
M
E
Enter
100 PPM
Select [E] to select or ▲ or ▼ to select another and press [E]
▲
▼
4-20 mA Adjustment Example
M
E
Down
4-20mA
S.P. Function 4-20 mA Calibrator
▲
▼
M
E
Enter
Calib
S.P. Function - Calib Adjust
▲
▼
M
E
Enter
Out: 4mA
Use ▲ or ▼ keys to select 4 mA or 20mA
▲
▼
M
E
Enter
4mA
Selects 4 mA
▲
▼
M
E
Enter
ACK
Momentary Acknowledge of new Set Point
▲
▼
Figure 11: Set-Up Configuration
Model 4501-XX Toxic Gas Sensor Module
Page 19 of 41
5.5 Maintenance Sub-Menu
The maintenance menu enables the operator to view sensor and software versions. Sierra Monitor technical
support has access to other values as needed. The maintenance menu operation is described in the table below.
Key
Function
Display
Description
Reference
M
E
Mode
XXX PPM
Default Display (example (4501-05)
▲
▼
M
E
Mode
CALIB
Go to previous maintenance menu item
▲
▼
M
E
Mode
SETUP:
▲
▼
M
E
Mode
MAINT:
▲
▼
M
E
Enter
VX.XX
Version number of firmware
▲
▼
M
E
Enter
CCC001
Configuration Version
▲
▼
Figure 12: Maintenance Sub-Menu
Model 4501-XX Toxic Gas Sensor Module
Page 20 of 41
6 CALIBRATION
6.1 Calibration Frequency
The sensor module must be calibrated every 180 days at a minimum. Periodic functional tests are advisable for
critical applications and hostile environments.
The sensor module microprocessor software includes high-level self checking algorithms which provide
continuous sensor diagnostic and self adjustment.
6.2 Calibration Preparation
Calibration of the sensor is accomplished by simple menu based steps and application of span gas.
NOTE: If an error is made during any stage of the calibration process, hold the magnet stick at the
[M] for 10 seconds. A scrolling display will indicate “calibration aborted” and the sensor module
will exit the calibration activity and return to normal operating mode. The calibration procedure
can then be restarted.
Calibration must be performed only when the area is known to be clear of the gas of interest. When in doubt, use
a portable instrument to confirm that there is no background.
For compliance with Factory Mutual (FM) Approvals, the Sierra Monitor Model 1250-01, 1260 -05 and 1260-45
are the FM Approved calibration gas delivery devices. Use the Model 5358-01 Calibration Adapter delivery fitting.
NOTE: Refer to Appendix D for information on use of permeation tube for 4501-25 calibration.
6.3 Calibration Gas Delivery Methods
Calibration gas can be delivered to the sensors via the Model 5358-01:
Calibration Adapter (Figure 13) - used with portable calibrators.
CALIBRATION PROCEDURE
The Calibration Menu is described in Section 6.5:
The procedure requires that the menu “keys” be activated using the magnet stick.
Each key press steps through the process of setting the zero value for clean air
and then setting the span value.
At each of these steps, apply calibration gas of the value corresponding to
the setting accepted on the sensor module display.
Sample Gas In
Figure 13: Model 5358-01
Calibration Adapter
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Sierra Monitor 4501-XX Electrochemical 2-Wire Toxic Gas Sensor Owner's manual

Sierra Monitor
Brand
Sierra Monitor
Model
4501-XX Electrochemical 2-Wire Toxic Gas Sensor
Category
Carbon monoxide (CO) detectors
Type
Owner's manual
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