Sierra Monitor Corporation 4501-06, 4501-05, 4501-04, 4501-XX User Manual
MODEL 4501-XX
2-Wire Series
TOXIC GAS SENSOR MODULE
APPLICABILITY & EFFECTIVITY
Effective for all Model 4501-XX Modules manufactured after September 1, 2006.
4501-04 FM Pending
4501-05 FM Approved
4501-06 FM Pending
Instruction Manual Part Number T13022
Rev. A
Model 4501-XX Toxic Gas Sensor Module
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
Model 4501-XX Toxic Gas Sensor Module
TABLE OF CONTENTS
1. PRODUCT DESCRIPTION .............................................................................................................................1
1.1 GENERAL........................................................................................................................................................1
1.2 MOUNTING CONFIGURATION......................................................................................................................1
1.3 THEORY OF OPERATION..............................................................................................................................1
1.4 MECHANICAL .................................................................................................................................................2
1.4.1 ENCLOSURE ...........................................................................................................................................2
1.4.2 TRANSMITTER ELECTRONICS .............................................................................................................2
1.4.3 SENSOR ASSEMBLY ..............................................................................................................................2
1.5 INTERCONNECT WIRING..............................................................................................................................2
1.6 POWER REQUIREMENTS .............................................................................................................................2
2. CAUTIONS & WARNINGS..............................................................................................................................4
2.1 INTRODUCTION .............................................................................................................................................4
2.2 GAS SENSOR MODULES - GENERAL.........................................................................................................4
2.3 WIRING............................................................................................................................................................4
2.4 CALIBRATION FREQUENCY .........................................................................................................................4
3. QUICK START.................................................................................................................................................5
3.1 OVERVIEW......................................................................................................................................................5
3.2 WIRING............................................................................................................................................................5
3.3 MODULE INSTALLATION...............................................................................................................................5
3.4 TRANSMITTER INSTALLATION ....................................................................................................................5
3.5 START-UP & OPERATION .............................................................................................................................5
3.6 ZERO STABILIZATION ...................................................................................................................................5
4. INSTALLATION ...............................................................................................................................................6
4.1 SENSOR MODULE LOCATIONS ...................................................................................................................6
4.2 WIRING............................................................................................................................................................6
4.3 ENCLOSURE INSTALLATION........................................................................................................................6
4.4 TRANSMITTER AND SENSOR INSTALLATION ...........................................................................................7
5. OPERATION....................................................................................................................................................8
5.1 INTRODUCTION .............................................................................................................................................8
5.2 DATA ENTRY KEYPAD ..................................................................................................................................8
5.3 MAIN MENU ....................................................................................................................................................9
5.4 MAINTENANCE SUB-MENU ........................................................................................................................10
5.5 DIAGNOSTICS SUB-MENU..........................................................................................................................11
5.5.1 Notes ......................................................................................................................................................12
6. CALIBRATION...............................................................................................................................................13
6.1 CALIBRATION FREQUENCY .......................................................................................................................13
6.2 CALIBRATION PREPARATION....................................................................................................................13
6.2.1 CALIBRATION GAS DELIVERY METHODS.........................................................................................13
CALIBRATION PROCEDURE..................................................................................................................................13
6.2.2 SENSOR EXPOSURE TO GAS.............................................................................................................13
7. SERVICE .......................................................................................................................................................15
7.1 SENSOR MODULE CONFIGURATION........................................................................................................15
7.2 ENCLOSURE REPLACEMENT ....................................................................................................................15
7.3 TRANSMITTER REPLACEMENT .................................................................................................................16
7.4 SENSOR REPLACEMENT............................................................................................................................16
INSTALLATION INSPECTION .................................................................................................................................16
7.4.1 CONTROLLER INSTALLATION ............................................................................................................16
Contents
Model 4501-XX Toxic Gas Sensor Module
7.4.2 CABLING INSTALLATION .....................................................................................................................16
7.4.3 SENSOR MODULE INSTALLATION .....................................................................................................16
7.4.4 MOISTURE TRAPS AND RAINSHIELDS..............................................................................................17
7.4.5 STANDARD VOLTAGES .......................................................................................................................17
INSPECTION AND TROUBLESHOOTING GUIDE .................................................................................................17
7.4.6 IF MODULE DOES NOT DISPLAY THE CORRECT PPM GAS ...........................................................17
7.4.7 If the module does not display the correct PPM.....................................................................................17
7.4.8 If the display shows ‘NO SENSOR’ – Sensor Failing.............................................................................17
7.4.9 If the display shows “C” – calibration mode ...........................................................................................17
7.4.10 If the display shows “ T ” – DOWNSCALE INDICATOR.......................................................................17
7.4.11 If the display shows “HIGH” – UPSCALE INDICATOR..........................................................................17
8. APPENDICES................................................................................................................................................18
APPENDIX A: SPECIFICATIONS ............................................................................................................................18
APPENDIX B: MODEL NUMBERS & PARTS LIST .................................................................................................20
APPENDIX C: LIMITED WARRANTY......................................................................................................................21
Contents
Model 4501-XX Toxic Gas Sensor Module
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
• 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 multi-directional installation
attitudes.
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:
▪ 4501-04 Carbon Monoxide Gas Sensor Module
▪ 4501-05 Hydrogen Sulfide Gas Sensor Module
▪ 4501-06 Chlorine 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.
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.
Page: 1
Model 4501-XX Toxic Gas Sensor Module
1.4 MECHANICAL
The sensor module is comprised of the following three primary components:
1.4.1 ENCLOSURE
Explosion proof, rain-tight stainless steel electrical 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. See Figure 1-2 for details.
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 INTERCONNECT WIRING
Not supplied with the sensor module, but necessary to the installation and operation is the two conductor
wiring 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.
Page: 2
Model 4501-XX Toxic Gas Sensor Module
Model 4501-05 Hydrogen Sulfide Gas Sensor Module– Dimensions
Figure 1-1
Figure 1-2
Model 4501-05 Hydrogen Sulfide Gas Sensor Module– Orientation Options
Page: 3
Model 4501-XX Toxic Gas Sensor Module
2. CAUTIONS & 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 sensor is 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
2.3 WIRING
"DO NOT PAINT".
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.
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
2.4 CALIBRATION FREQUENCY
NOTE
conductors.
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 H
would lead to alarm activation within any system utilizing the output of the 4501-05.
S that
2
Page: 4
Loading...