MSA General Monitors S4000TH User manual
The information and technical data disclosed in
this document may be used and disseminated
only for the purposes and to the extent
specifically authorized in writing by General
Monitors.
Instruction Manual 10-16
General Monitors reserves the right to change
published specifications and designs without
prior notice.
MANS4000TH
Part No. MANS4000TH
Revision N/10-16
Model S4000TH
Intelligent Sensor for
Hydrogen Sulfide Gas Detection
Model S4000TH
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This page intentionally left blank
Model S4000TH
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Table of Contents
MODEL S4000TH..........................................................................................................................I
INTELLIGENT SENSOR FOR.......................................................................................................I
HYDROGEN SULFIDE GAS DETECTION...................................................................................I
TABLE OF FIGURES..................................................................................................................VI
TABLE OF TABLES...................................................................................................................VII
QUICK START GUIDE.................................................................................................................1
Mounting and Wiring...............................................................................................................................1
Tools Required...........................................................................................................................1
Terminal Connections.............................................................................................................................2
1.0INTRODUCTION ....................................................................................................................4
1.1Protection for Life.......................................................................................................................4
1.2Special Warnings.......................................................................................................................4
1.3System Integrity Verification ......................................................................................................5
2.0PRODUCT DESCRIPTION.....................................................................................................7
2.1General Description ...................................................................................................................7
3.0INSTALLATION......................................................................................................................8
3.1Receipt of Equipment.................................................................................................................8
3.2Tools Required...........................................................................................................................9
3.3Choosing Product Locations......................................................................................................9
3.3.1Remote Mounting of the Sensor from the Electronics................................................10
3.4Mounting and Wiring................................................................................................................11
3.5Terminal Connections..............................................................................................................13
3.5.1Terminal Block TB1 – Sensor Connections................................................................13
3.5.2Terminal Block TB2 – Power and Signal Connections...............................................13
3.5.3DC Power and Ground Connections...........................................................................15
3.5.4Analog Signal Connections.........................................................................................16
3.5.5Terminal Block TB3 – Relay Connections ..................................................................16
3.5.6European Union (EU) Approved Applications.............................................................17
3.5.7Cable Termination in the Non-hazardous Area ..........................................................17
3.6Maintaining the X/P Integrity....................................................................................................18
4.0OPERATION.........................................................................................................................19
4.1Start-Up Checklist....................................................................................................................19
4.2Start-Up....................................................................................................................................19
4.3Relay Reset..............................................................................................................................19
4.4User Selectable Options ..........................................................................................................20
4.4.1Model S4000TH User Menu Structure........................................................................21
4.4.2Sensor Range.............................................................................................................21
Model S4000TH
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4.4.3Calibration Output.......................................................................................................22
4.4.4Warning Relay Settings ..............................................................................................22
4.4.5Alarm Relay Settings...................................................................................................23
4.4.6Modbus Channel 1 Settings........................................................................................23
4.4.7Modbus Channel 2 Settings........................................................................................24
4.5HART........................................................................................................................................24
4.6Gas Check Mode .....................................................................................................................25
4.6.1Procedure for Checking the Calibration......................................................................25
4.7Calibration................................................................................................................................25
4.7.1Calibration Procedure .................................................................................................26
4.7.2Aborting Calibration.....................................................................................................27
4.7.3Remaining Sensor Life................................................................................................27
4.7.4Initializing the Remaining Sensor Life.........................................................................27
4.8Calibration Equipment..............................................................................................................27
4.8.1Calibrating with a Breaker Bottle and Ampoules ........................................................27
4.8.2Calibrating with an H2S Portable Purge Calibrator .....................................................28
4.8.3Calibrating with an RGC .............................................................................................29
5.0MAINTENANCE ...................................................................................................................30
5.1General Maintenance...............................................................................................................30
5.2Storage.....................................................................................................................................30
6.0TROUBLESHOOTING .........................................................................................................31
6.1Fault Codes and Their Remedies............................................................................................31
6.1.1F2 - Failed to Complete the Calibration......................................................................31
6.1.2F3 Flash Checksum Error...........................................................................................31
6.1.3F4 - Sensor Heater Open Error or Sensor Amplifier Error..........................................31
6.1.4F5 - Sensor Heater Shorted Error...............................................................................32
6.1.5F6 - Low Supply Voltage.............................................................................................32
6.1.6F7 - EEPROM Verification Failure..............................................................................32
6.1.7F8 - Failure to Complete Setup...................................................................................32
6.1.8F9 - Gas Check Period Exceeded ..............................................................................33
6.1.9F10 – Switch Error ......................................................................................................33
6.1.10F11 Internal Error........................................................................................................33
7.0CUSTOMER SUPPORT.......................................................................................................34
7.1General Monitors’ Offices.........................................................................................................34
8.0MODBUS INTERFACE ........................................................................................................35
8.1Baud Rate................................................................................................................................35
8.2Data Format.............................................................................................................................35
8.3Modbus Read Status Protocol (Query/Response)...................................................................35
8.3.1Modbus Read Query Message...................................................................................35
8.3.2 Modbus Read Response Message.................................................................................35
8.4Modbus Write Command Protocol (Query/Response) ............................................................36
8.4.1Modbus Write Query Message ...................................................................................36
8.4.2Modbus Write Response Message.............................................................................36
8.5Function Codes Supported ......................................................................................................36
8.6Exception Responses and Exception Codes...........................................................................36
8.6.1Exception Response...................................................................................................36
8.6.2Exception Code...........................................................................................................37
Model S4000TH
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8.7S4000TH Command Register Locations .................................................................................38
8.8S4000TH Command Register Details......................................................................................40
8.8.1Analog (00H)...............................................................................................................40
8.8.2Mode (01H).................................................................................................................40
8.8.3Status/Error (02H).......................................................................................................41
8.8.4Not Used (03H)...........................................................................................................41
8.8.5Unit Type (04H)...........................................................................................................41
8.8.6Software Revision (05H).............................................................................................41
8.8.7Status Block (06H)......................................................................................................41
8.8.8Analog Value (06H).....................................................................................................42
8.8.9Mode & Error (07H).....................................................................................................42
8.8.10Error Sensor & Sensor Life (08H)...............................................................................42
8.8.11Display (0x09H & 0x0AH)...........................................................................................42
8.8.12Serial Number (0BH/0CH) ..........................................................................................43
8.8.13Alarm Settings (0DH)..................................................................................................43
8.8.14Warn Settings (0EH)...................................................................................................44
8.8.15Com1 Address (0FH)..................................................................................................44
8.8.16Com1 Baud Rate (10H) ..............................................................................................44
8.8.17Com1 Data Format (11H) ...........................................................................................45
8.8.18Com2 Address (12H) ..................................................................................................45
8.8.19Com2 Baud Rate (13H) ..............................................................................................45
8.8.20Com2 Data Format (14H) ...........................................................................................45
8.8.21Not Used (15H)...........................................................................................................46
8.8.22Reset Alarms (16H).....................................................................................................46
8.8.23Sensor Life (17H)........................................................................................................46
8.8.24Sensor Scale (18H).....................................................................................................46
8.8.25HazardWatch (Co – Calibration Output) (19H)..........................................................46
8.8.26Not Used (1A, AB, 1C H)............................................................................................46
8.9HART Enable (1D H)................................................................................................................46
8.9.1HART Test (1Eh).........................................................................................................46
8.9.2Abort Calibration (1Fh)................................................................................................47
8.9.3Total Receive Errors (20H) .........................................................................................47
8.9.4Bus Activity Rate % (21H)...........................................................................................47
8.9.5Function Code Errors (22H)........................................................................................47
8.9.6Starting Address Errors (24H).....................................................................................47
8.9.7RXD CRC Errors Hi (25H) ..........................................................................................47
8.9.8RXD CRC Errors Lo (Same as Hi) (26H)....................................................................47
8.9.9Parity Errors (27H)......................................................................................................47
8.9.10Overrun Errors (28H) ..................................................................................................48
8.9.11Framing Errors (29H)..................................................................................................48
8.9.12Total Software CH1 Errors (2AH) ...............................................................................48
8.9.13Not Used (2BH)...........................................................................................................48
8.9.14Clear Hardware Errors (2CH) .....................................................................................48
8.9.15Clear Communication Errors (2DH)............................................................................48
8.9.16User Information (60H to 6FH)....................................................................................51
8.9.17CH2 Total Receive Errors (70H).................................................................................51
8.9.18CH2 Bus Activity Rate % (71H) ..................................................................................52
8.9.19CH2 Function Code Errors (72H)................................................................................52
8.9.20CH2 Starting Address Errors (73H) ............................................................................52
8.9.21CH2 Number of Register Errors (74H)........................................................................52
8.9.22CH2 RXD CRC Errors Hi (75H)..................................................................................52
8.9.23CH2 RXD CRC Errors Lo (Same as Hi) (76H) ...........................................................52
8.9.24CH2 Parity Errors (77H).............................................................................................52
Model S4000TH
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8.9.25CH2 Overrun Errors (78H)..........................................................................................52
8.9.26CH2 Framing Errors (79H)..........................................................................................52
8.9.27CH2 Total Software CH1 Errors (7AH).......................................................................52
8.9.28Not Used (7BH)...........................................................................................................53
8.9.29CH2 Clear UART Errors (7CH)...................................................................................53
8.9.30CH2 Clear Stats (7DH) ...............................................................................................53
9.0APPENDIX............................................................................................................................54
9.1Warranty...................................................................................................................................54
9.2Principle of Operation...............................................................................................................54
9.3Specifications...........................................................................................................................55
9.3.1System Specifications.................................................................................................55
9.3.2Mechanical Specifications...........................................................................................55
9.3.3Electrical Specifications ..............................................................................................55
9.3.4Environmental Specifications......................................................................................56
9.4Approvals.................................................................................................................................57
9.5Spare Parts and Accessories...................................................................................................57
9.5.1Sensors.......................................................................................................................57
9.5.2Sensor Housing...........................................................................................................57
9.5.3Sensor Accessories ....................................................................................................58
9.5.4Calibration Equipment.................................................................................................58
9.5.5Intelligent Sensor (S4000TH) Replacement Parts......................................................59
9.5.6Recommended Spare Parts for One Year..................................................................59
9.6FM Approval.............................................................................................................................60
Model S4000TH
vi
Table of Figures
Figure 1: S4000TH Outline and Mounting Dimensions, in inches..........................................................................1
Figure 2: S4000TH with RGC Outline and Mounting Dimensions, in inches.........................................................2
Figure 3: Spring Type Terminal Block Operation...................................................................................................2
Figure 4: Screw Type Terminal Block Operation....................................................................................................3
Figure 5: Model S4000TH Intelligent Sensor .........................................................................................................7
Figure 6: Model S4000TH Intelligent Sensor with RGC.........................................................................................8
Figure 7: S4000TH Outline and Mounting Dimensions, in inches........................................................................11
Figure 8: S4000TH with RGC Outline and Mounting Dimensions, in inches.......................................................12
Figure 9: S4000TH Terminal Block Locations......................................................................................................13
Figure 10: Spring Type Terminal Block Operation...............................................................................................14
Figure 11: Screw Type Terminal Block Operation................................................................................................14
Figure 12: Wire Strip Length.................................................................................................................................14
Figure 13: Relay Protection for DC and AC Loads...............................................................................................17
Figure 14: Relay Reset.........................................................................................................................................20
Figure 15: User Menu Structure...........................................................................................................................21
Figure 16: Gas Check...........................................................................................................................................25
Figure 17: Automatic Calibration Mode................................................................................................................26
Figure 18: Calibration in Progress Mode..............................................................................................................26
Figure 19: Calibration Complete Mode.................................................................................................................26
Figure 20: Ampoules with Breaker Bottles ...........................................................................................................28
Figure 21: Portable Purge Calibrator....................................................................................................................28
Figure 22: Remote Gas Calibrator (RGC, P/N 80153-1)......................................................................................29
vii
Model S4000TH
Table of Tables
Table 1: TB2 Power and Signal Connections.......................................................................................................14
Table 2: Ground or Common Connections...........................................................................................................15
Table 3: Power Connections ................................................................................................................................15
Table 4: Analog Signal Connections ....................................................................................................................16
Table 5: Alarm Relay Connections.......................................................................................................................16
Table 6: Warn Relay Connections........................................................................................................................16
Table 7: Fault Relay Connections ........................................................................................................................16
Table 8: GM Locations..........................................................................................................................................34
Table 9: Data Format............................................................................................................................................35
Table 10: Exception Codes ..................................................................................................................................37
Table 11: Command Register Locations..............................................................................................................40
Table 12: Com1 Baud Rate..................................................................................................................................45
Table 13: Com1 Data Format...............................................................................................................................45
Table 14: Com2 Baud Rate..................................................................................................................................45
Table 15: Com2 Data Format...............................................................................................................................46
Table 16: Sensor Scale ........................................................................................................................................46
Table 17: 24 VDC Cable Lengths.........................................................................................................................56
Table 18: Analog Output Cable Lengths ..............................................................................................................56
Table 19: Sensor Cable Lengths..........................................................................................................................56
1
Model S4000TH
Quick Start Guide
Mounting and Wiring
Tools Required
“5mm” Allen head wrench to remove enclosure lid (included with gas detector).
Flat-head screwdriver maximum 3/16 in (5 mm) width for terminal block connections
(included with gas detector).
Adjustable wrench for conduit or cable gland connections (not included).
The outline and mounting dimensions for the Model S4000TH (Figure 1) should be used when
making installation determinations.
Information on Class I Division 1 and Zone 1 wiring methods can be found in the NEC and
CEC.
WARNING: Acetic acid will cause damage to metal components, metal hardware, ceramic
IC’s, etc. If damage results from the use of a sealant that outgases acetic acid
(RTV silicone), the warranty will be void.
Figure 1: S4000TH Outline and Mounting Dimensions, in inches
Model S4000TH
2
Figure 2: S4000TH with RGC Outline and Mounting Dimensions, in inches
Terminal Connections
The terminal blocks (TB) are located inside the housing and can be accessed by removing the
cover. A label inside of the housing cover provides a diagram of all the terminal connections.
It is recommended that a minimum three-wire shielded cable be used for making the power
and 0-20mA Output connection on TB2 of the S4000TH. It is also recommended that separate
two-wire shielded twisted pair cables be used for making the Modbus connections. The spring
type terminal block accepts 14 AWG to 20 AWG and the screw type terminal block accepts 12
AWG to 18 AWG stranded or solid wire. Each wire should be stripped before wiring the
S4000TH. To connect wiring to the spring type terminal block, insert a screwdriver into the
orange tab and press down (Figure 3), opening the terminal. Insert the wire into the terminal
and release the orange tab, clamping the wire in the terminal. Check the hold of the wire by
gently tugging it to ensure it is locked in.
Figure 3: Spring Type Terminal Block Operation
Model S4000TH
3
To connect wiring to the screw type terminal block, loosen the top screw counter clock wise
(Figure 4). Insert the wire into the terminal and tighten the top screw clockwise.
Figure 4: Screw Type Terminal Block Operation
NOTE: Power must remain disconnected until all other wiring connections have been made.
The maximum distance between the S4000TH and the power supply is 2,000 feet or 610
meters (each cable run should be as short as possible). See Section 9.3.3 for cable length
specifications.
Connect +24 VDC to TB2, position 9. Connect the ground or common wire to TB2, position 8.
For making power and ground connections to display devices, see Figures 2 and 3.
To connect the analog signal, please refer to Section 3.5.4.
General Monitors recommends that the S4000TH Intelligent Sensor be calibrated 1 hour after
start-up and that the calibration be checked at least every 90 days to ensure system integrity.
The instrument is now ready to operate. Please consult the manual for more information on the
instrument’s many features.
NOTE: If in case of device failure during set-up or testing, please consult Troubleshooting
(Sec. 6.0) or call the factory.
4
Model S4000TH
1.0 Introduction
1.1 Protection for Life
General Monitors’ mission is to benefit society by providing solutions through industry leading
safety products, services, and systems that save lives and protect capital resources from the
dangers of hazardous flames, gases, and vapors.
This manual provides instruction for installing and operating General Monitors’ Model S4000TH
Intelligent Sensor for hydrogen sulfide gas detection. Although the S4000TH is easy to install
and operate, this manual should be read in full and the information contained herein
understood before attempting to place the system in service.
The safety products you have purchased should be handled carefully and installed, calibrated,
and maintained in accordance with the respective product instruction manual. Remember these
products are for your safety.
1.2 Special Warnings
The Model S4000TH Intelligent Sensor contains components, which can be damaged by static
electricity. Special care must be taken when wiring the system to ensure that only the
connection points are touched.
WARNING: Hydrogen sulfide (H2S) is an extremely toxic gas, and exposure may result in a
loss of consciousness or death.
DO NOT OPEN WHEN AN EXPLOSIVE ATMOSHPERE IS PRESENT.
READ AND UNDERSTAND INSTRUCTION MANUAL BEFORE
OPERATING OR SERVICING. OPEN CIRCUIT BEFORE REMOVING
COVER. POTENTIAL ELECTROSTATIC CHARGING HAZARD – USE
ONLY DAMP CLOTH FOR CLEANING.
NE PAS OUVRIR UN PRÉSENCE D’ATMOSPHÉRE EXPLOSIVE. LIRE
ET COMPRENDRE MANUEL D’INSTRUCTIONS AVANT D’UTILISER OU
SERVICE. OUVRIR LE CIRCUIT AVANT D'ENLEVER LE COUVERCLE.
DANGER POTENTIEL ÉLECTROSTATIQUE DE CHARGE –
UTILISATION UNIQUEMENT UN CHIFFON HUMIDE POUR LE
NETTOYAGE.
SPECIAL CONDITIONS OF SAFE USE PERTAINING TO ATEX/IECEx INSTALLATIONS:
The S4000TH shall not be used as a Safety Related Device as defined by ATEX Directive
94/9/EC,
When alternative detector elements are utilized, they shall only be mounted remotely in a
suitable certified enclosure in accordance with requirements of their respective certificates and
relevant local requirements. The associated cable shall be connected to the Intelligent Gas
Sensors using a suitably certified cable entry device with a ¾” thread form.
The Universal Gas Sensor (P/N 51457-XX) is suitable for use with the following enclosure
types and service temperature ranges that are dependent on the type of cement used in their
construction; therefore, they shall only be used with the enclosure type and where the surface
temperature, at the point of mounting, is as detailed below:
Model S4000TH
5
Cement Ambient Range Enclosure Type
2850FT Cat 11
or 2762 Cat 17 -40°C to +70°C Enclosures that are certified by a notified body and
satisfy the requirements of the current edition of EN
60079-1 or EN 60079-7 and European Directive
94/9/EC.
2850FT Cat 11 -40°C to +120°C Enclosures that are certified by a notified body and
satisfy the requirements of the current edition of EN
60079-7 and European Directive 94/9/EC.
2762 Cat 17 -40°C to +180°C Enclosures that are certified by a notified body and
satisfy the requirements of the current edition of EN
60079-7 and European Directive 94/9/EC.
The Universal Gas Sensor (51457-XX), when tested in accordance with clause 15.4.2.1 of EN
60079-1, produced a maximum surface rise of 26.3 K. This value should be considered when
the component is incorporated into equipment.
The Universal Gas Sensor (51457-XX), utilizing Types 2850FT Cat 11 and 2762 Cat 17 cement
shall only be fitted to enclosures having a maximum reference pressure of 9.6 bar.
1.3 System Integrity Verification
To ensure operation at optimum performance, General Monitors recommends that certain
maintenance items be performed.
Commissioning Safety Systems
Before power-up, verify wiring, terminal connections and stability of mounting for all integral
safety equipment including the following items:
Power supplies
Control modules
Field detection devices
Signaling and output devices
Accessories connected to field and signaling devices
After the initial application of power (and any factory specified warm-up period) to the safety
system, verify that all signal outputs, to and from devices and modules, are within the
manufacturers’ specifications. Initial calibration, calibration checking, or testing should be
performed per the manufacturer’s recommendations and instructions.
Proper system operation should be verified by performing a full, functional test of all component
devices of the safety system, ensuring that the proper levels of alarming occur.
Fault and malfunction circuit operation should be verified.
Model S4000TH
6
Periodic Testing/Calibration of Field Devices
Periodic testing/calibrating should be performed per the manufacturer’s recommendations and
instructions. Testing/Calibrating procedures should include, verify integrity of all optical surfaces
and devices
When testing produces results outside of the manufacturer’s specifications, re-calibration or
repair and replacement of the suspect device(s) should be performed as necessary. Calibration
intervals should be independently established through a documented procedure, including a
calibration log, maintained by plant personnel or third party testing services.
Periodic System Verification
The following system verifications should be performed at least annually:
Verify wiring, terminal connections and stability of mounting for all integral safety equipment
including, the following items:
Power supplies
Control modules
Field detection devices
Signaling and output devices
Accessories connected to field and signaling devices
Calibration intervals should be independently established through a documented procedure,
including a calibration log maintained by plant personnel or third party testing services.
7
Model S4000TH
2.0 Product Description
2.1 General Description
The Model S4000TH is an intelligent sensor for the detection of hydrogen sulfide (H2S) gas.
The microprocessor-based electronics process information at the sensor site within an
explosion-proof housing.
A digital display provides indications and display codes that can be viewed through a window in
the cover. A red LED above the digital display signifies an “alarm” condition, while a red LED
below the digital display signifies a “warning” condition. Analog signal (4-20 mA) and relays
provide remote and/or discrete indications of the sensor’s operation. Optional dual redundant
Modbus, HART, or HART and single Modbus provide digital communication.
The S4000TH Intelligent Sensor is rated explosion-proof for use in the following hazardous
areas:
CSA/FM: Class I, Division 1, Groups B, C, D and Class I, Zone 1, IIB+H2
ATEX/IECEx: Zone 1, Group IIB+ H2 and Zone 21, Group IIIC
Figure 5: Model S4000TH Intelligent Sensor
NOTE: The image in Figure 5 is for reference only. See section 9.3 for actual product
specifications.
Model S4000TH
8
Figure 6: Model S4000TH Intelligent Sensor with RGC
NOTE: The image in Figure 6 is for reference only. See section 9.3 for actual product
specifications.
3.0 Installation
3.1 Receipt of Equipment
All equipment shipped by General Monitors is pre-packed in shock absorbing containers, which
provide protection against physical damage (original containers should be kept for future
shipping or storage needs).
Shipping container contents should be carefully removed and checked against the packing list.
If any damage has occurred or there is any discrepancy in the order, please notify General
Monitors as soon as possible.
Model S4000TH
9
All correspondence with General Monitors must specify the equipment part number and serial
number.
Although the factory tests each unit, a complete system checkout is suggested upon initial
installation to ensure system integrity.
WARNING: Only suitably skilled and competent personnel should carry out installation and
maintenance.
WARNING: The S4000TH Intelligent Sensor contains components, which can be damaged by
static electricity. Special care must be taken when wiring the system to ensure that only the
connection points are touched.
3.2 Tools Required
“5mm” Allen head wrench to remove enclosure lid (included with gas detector).
Flat-head screwdriver maximum 3/16 in (5 mm) width for terminal block connections
(included with gas detector).
Adjustable wrench for conduit or cable gland connections (not included).
3.3 Choosing Product Locations
There are no standard rules for sensor placement, since the optimum sensor location is
different for each application. The customer must evaluate conditions at the facility to make this
determination. In generally, experience suggests the device is more effective at detecting gas if
the following recommendations are followed:
Mount sensor pointing down to prevent water build-up on the sensor head.
Do not place sensor where contaminating substances may coat it.
Although the S4000TH is RFI resistant, do not install sensor in close proximity to radio
transmitters or similar equipment.
Locate the S4000TH where prevailing air currents contain the maximum concentration
of gas.
Locate the S4000TH near possible sources of gas leaks.
Observe the S4000TH’s temperature specification and locate the unit away from
concentrated sources of heat.
Install sensor in an area that is as free from wind, dust, water, shock, and vibration as
possible. See Section 9.3.4 for the environmental specifications of the unit. If dust and
rain cannot be avoided, we recommend the use of our splash guard (GM P/N 10395-1).
Sensors may be adversely affected by prolonged exposure to certain substances. Loss of
sensitivity or corrosion may be gradual if such agents are present in low concentrations or it
may be rapid at high concentrations. Examples of these substances are as follows:
Silicones (often contained in greases and aerosols)
Halides: compounds containing fluorine, chlorine, bromine and iodine
Model S4000TH
10
Heavy metals, e.g. tetraethyl lead
Caustic and Acidic liquids and vapors
Glycol
The presence of contaminants in an area does not necessarily preclude the use of a S4000TH
Intelligent Sensor. The feasibility of using a sensor in such areas must be determined by an
analysis of the specific factors in each application, and General Monitors should be consulted
before attempting any such installation.
Sensors used in these areas usually require more frequent calibration checks than normal, and
typically have a shorter life. In many such applications the standard 2-year warranty would not
apply.
IMPORTANT: Each H2S sensor is shipped with a red plastic cap fitted over the sensor head.
Inside the cap is a desiccant. Do not remove this cap until the system is ready
to be powered. Save the cap and re-cap the sensor anytime the system power
is off for more than 1 hour.
WARNING: General Monitors discourages the painting of sensor assemblies. If the sensor
head is painted over, the gas will not be able to diffuse into the sensor. If the
assembly cover is painted over, the digital display cannot be read.
3.3.1 Remote Mounting of the Sensor from the Electronics
If it is necessary to remotely mount the sensor from the electronics and the housing, the
maximum distance can be no greater than 3,700 feet (1,125) meters, using 14 AWG wire.
Sensors that are remotely mounted must be placed in an explosion-proof rated sensor
housing (GM P/N 10252-1), and the cable run must be contained in a conduit running from
the sensor housing to the electronics.
For remote mounting in Canada where the location is classified using the Zone classification
system, the sensors must be mounted in sensor housing B14-020. Only sensors 51457 can
be used in this configuration.
Model S4000TH
11
3.4 Mounting and Wiring
WARNING: Unused cable entry holes must be sealed with a suitably certified ATEX or IECEx
approved explosion-proof plug. Red caps supplied by General Monitors are for
dust protection only and must not be left on the unit when installed.
WARNING: Conduits must be sealed within 18 inches of the enclosure.
The outline and mounting dimensions for the S4000TH (Figure 5) should be used when making
installation determinations. A complete list of the mechanical specifications can be found in
Section 9.3.2.
To prevent possible corrosion due to moisture or condensation, it is recommended that the
conduit connected to the S4000TH housing, contain a drain loop.
NOTE: For ATEX and IECEx applications, conduit connections must only be made via suitably
certified ATEX (or IECEx as appropriate) conduit stopping boxes.
Information on Class I Division 1 and Zone 1 wiring methods can be found in the NEC or CEC.
Figure 7: S4000TH Outline and Mounting Dimensions, in inches
Model S4000TH
12
Figure 8: S4000TH with RGC Outline and Mounting Dimensions, in inches
WARNING: Acetic acid will cause damage to metal components, metal hardware, ceramic
IC’s and other parts. If damage results from the use of a sealant that outgases
acetic acid (RTV silicone), the warranty will be void.
Once correctly installed, the S4000TH requires little or no maintenance, other than periodic
calibration checks to ensure system integrity. General Monitors recommends that a schedule
be established and followed.
NOTE: The S4000TH full 2-year warranty will be voided if customer personnel or third parties
damage the S4000TH during repair attempts.
Sensor heads exposed to the elements may require the accessory mounting threads to be
lubricated. Grease must not be used. As an alternate, PTFE (Teflon) tape may be used on
sensor accessory threads.
NOTE: Do not use any material or substance on threads that contact the sensor housing.
The removal of particulate matter from sensor accessories may be done through the use of an
appropriate halogen-free solvent. Water or ethanol are examples of suitable solvents. The
accessories should be thoroughly dried, with compressed air if necessary, before refitting to the
sensor body.
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