Model S4000T
Intelligent Sensor for
Hydrogen Sulfide Gas Detection
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
0307
General Monitors reserves the right to change
published specifications and designs without
prior notice.
MANS4000T
Part No.
Revision
MANS4000T
H/03-07
S4000T
This page intentionally left blank
ii
S4000T
Table of Contents
TABLE OF FIGURES ..................................................................................................................VI
TABLE OF TABLES...................................................................................................................VII
QUICK START GUIDE ................................................................................................................. 8
Mounting and Wiring ...............................................................................................................................8
Tools Required...........................................................................................................................8
Terminal Connections .............................................................................................................................8
1.0 INTRODUCTION .................................................................................................................. 11
1.1
1.2
1.3
Protection for Life .....................................................................................................................11
Special Warnings .....................................................................................................................11
System Integrity Verification ....................................................................................................11
2.0 PRODUCT DESCRIPTION................................................................................................... 13
2.1
General Description .................................................................................................................13
3.0 INSTALLATION.................................................................................................................... 14
3.1
3.2
3.3
3.4
3.5
3.6
Receipt of Equipment...............................................................................................................14
Tools Required.........................................................................................................................14
Choosing Product Locations ....................................................................................................14
3.3.1 Remote Mounting of the Sensor from the Electronics ................................................15
Mounting and Wiring ................................................................................................................16
Terminal Connections ..............................................................................................................17
3.5.1 Terminal Block TB1 – Sensor Connections ................................................................17
3.5.2 Terminal Block TB2 – Power and Signal Connections ...............................................17
3.5.3 DC Power and Ground Connections...........................................................................19
3.5.4 Analog Signal Connections.........................................................................................20
3.5.5 Terminal Block TB3 – Relay Connections ..................................................................20
3.5.6 European Union (EU) Approved Applications.............................................................21
3.5.7 Cable termination in the non-hazardous area.............................................................21
Maintaining the X/P Integrity ....................................................................................................22
4.0 OPERATION......................................................................................................................... 24
4.1
4.2
4.3
4.4
4.5
Start-Up Checklist ....................................................................................................................24
Start-Up ....................................................................................................................................24
Relay Reset..............................................................................................................................24
User Selectable Options ..........................................................................................................25
4.4.1 Model S4000T User Menu Structure ..........................................................................26
4.4.2 Sensor Range .............................................................................................................26
4.4.3 Warning Relay Settings ..............................................................................................27
4.4.4 Alarm Relay Settings...................................................................................................27
4.4.5 MODBUS Channel 1 Settings.....................................................................................28
4.4.6 MODBUS Channel 2 Settings.....................................................................................28
Gas Check Mode .....................................................................................................................29
4.5.1 Procedure for Checking the Calibration: .....................................................................29
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S4000T
4.6
4.7
Calibration ................................................................................................................................29
4.6.1 Calibration Procedure .................................................................................................30
4.6.2 Aborting Calibration.....................................................................................................31
4.6.3 Remaining Sensor Life................................................................................................31
4.6.4 Initializing the Remaining Sensor Life.........................................................................31
Calibration Equipment..............................................................................................................31
4.7.1 Breaker Bottles and Ampoules ...................................................................................31
4.7.2 H2S Portable Purge Calibrator ....................................................................................32
5.0 MAINTENANCE ................................................................................................................... 33
5.1
5.2
General Maintenance...............................................................................................................33
Storage.....................................................................................................................................33
6.0 TROUBLESHOOTING ......................................................................................................... 34
6.1
Fault Codes & Their Remedies................................................................................................34
6.1.1 F2 - Failed to Complete the Calibration ......................................................................34
6.1.2 F3 - EPROM Checksum Error ....................................................................................34
6.1.3 F4 - Sensor Heater Open Error...................................................................................34
6.1.4 F5 - Sensor Heater Shorted Error...............................................................................34
6.1.5 F6 - Low Supply Voltage.............................................................................................35
6.1.6 F7 - EEPROM Verification Failure ..............................................................................35
6.1.7 F8 - Failure to Complete Setup...................................................................................35
6.1.8 F9 - Gas Check Period Exceeded ..............................................................................35
6.1.9 F10 – Switch Error ......................................................................................................35
7.0 CUSTOMER SUPPORT ....................................................................................................... 36
T
7.1
General Monitors’ Offices.........................................................................................................36
8.0 MODBUS INTERFACE ........................................................................................................ 37
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
Baud Rate ................................................................................................................................37
Data Format .............................................................................................................................37
MODBUS Read Status Protocol (Query/Response)................................................................37
8.3.1 MODBUS Read Query Message ................................................................................37
8.3.2 MODBUS Read Response Message..............................................................................37
MODBUS Write Command Protocol (Query/Response) .........................................................38
8.4.1 MODBUS Write Query Message ................................................................................38
8.4.2 MODBUS Write Response Message ..........................................................................38
Function Codes Supported ......................................................................................................38
Exception Responses and Exception Codes ...........................................................................38
8.6.1 Exception Response ...................................................................................................38
8.6.2 Exception Code...........................................................................................................39
S4000T Command Register Locations ....................................................................................40
S4000T Command Register Details ........................................................................................41
8.8.1 Analog .........................................................................................................................41
8.8.2 Mode ...........................................................................................................................41
8.8.3 Status/Error .................................................................................................................42
8.8.4 Unit Type.....................................................................................................................42
8.8.5 Software Revision .......................................................................................................42
8.8.6 Status Block ................................................................................................................42
8.8.7 Alarm Settings.............................................................................................................42
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S4000T
8.8.8
8.8.9
8.8.10
8.8.11
8.8.12
8.8.13
8.8.14
8.8.15
8.8.16
8.8.17
8.8.18
8.8.19
8.8.20
8.8.21
8.8.22
8.8.23
8.8.24
8.8.25
8.8.26
Warn Settings..............................................................................................................43
Com1 Address ............................................................................................................43
Com1 Baud Rate.........................................................................................................43
Com1 Data Format......................................................................................................44
Com2 Address ............................................................................................................44
Com2 Baud Rate.........................................................................................................44
Com2 Data Format......................................................................................................44
Reset Alarms...............................................................................................................45
Sensor Life ..................................................................................................................45
Sensor Scale...............................................................................................................45
HazardWatch (Co – Calibration Output) .....................................................................45
Total Receive Errors ...................................................................................................45
Bus Activity Rate %.....................................................................................................45
Function Code Errors ..................................................................................................45
Starting Address Errors...............................................................................................45
Number of Register Errors ..........................................................................................46
RXD CRC Hi Errors.....................................................................................................46
RXD CRC Low Errors .................................................................................................46
Clear Comm Errors .....................................................................................................46
9.0 APPENDIX............................................................................................................................ 47
9.1
9.2
9.3
9.4
9.5
9.6
Warranty...................................................................................................................................47
Principle of Operation...............................................................................................................47
Specifications ...........................................................................................................................48
9.3.1 System Specifications .................................................................................................48
9.3.2 Mechanical Specifications...........................................................................................48
9.3.3 Electrical Specifications ..............................................................................................48
9.3.4 Environmental Specifications......................................................................................49
Approvals .................................................................................................................................50
Spare Parts and Accessories...................................................................................................50
9.5.1 Sensors .......................................................................................................................50
9.5.2 Sensor Housing...........................................................................................................50
9.5.3 Sensor Accessories ....................................................................................................51
9.5.4 Calibration Equipment.................................................................................................51
9.5.5 Intelligent Sensor (S4000T) Replacement Parts ........................................................52
9.5.6 Recommended Spare Parts for One (1) Year ............................................................52
FMRC Approval........................................................................................................................53
v
S4000T
Table of Figures
Figure 1: S4000T Outline and Mounting Dimensions............................................................................................. 8
Figure 2: Spring Type Terminal Block Operation ................................................................................................... 9
Figure 3: Screw Type Terminal Block Operation.................................................................................................... 9
Figure 3: Model S4000T Intelligent Sensor .......................................................................................................... 13
Figure 4: S4000T Outline and Mounting Dimensions........................................................................................... 16
Figure 6: Spring Type Terminal Block Operation ................................................................................................. 18
Figure 7: Screw Type Terminal Block Operation.................................................................................................. 18
Figure 8: Wire Strip Length................................................................................................................................... 18
Figure 7: Relay Protection for DC and AC Loads................................................................................................. 21
Figure 8: Relay Reset ........................................................................................................................................... 25
Figure 9: User Menu Structure ............................................................................................................................. 26
Figure 10: Gas Check........................................................................................................................................... 29
Figure 11: Automatic Calibration Mode ................................................................................................................ 30
Figure 12: Calibration in Progress Mode .............................................................................................................. 30
Figure 13: Calibration Complete Mode................................................................................................................. 30
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S4000T
Table of Tables
Table 1: TB2 Power and Signal Connections....................................................................................................... 17
Table 2: Ground or Common Connections........................................................................................................... 19
Table 3: Power Connections ................................................................................................................................ 19
Table 4: Analog Signal Connections .................................................................................................................... 20
Table 5: Alarm Relay Connections ....................................................................................................................... 20
Table 6: Warn Relay Connections........................................................................................................................ 20
Table 7: Fault Relay Connections ........................................................................................................................ 21
Table 8: GM Locations.......................................................................................................................................... 36
Table 9: Data Format............................................................................................................................................ 37
Table 10: Exception Codes .................................................................................................................................. 39
Table 11: Command Register Locations .............................................................................................................. 40
Table 12: Command Register Locations, Cont. ................................................................................................... 41
Table 13: Com1 Baud Rate .................................................................................................................................. 43
Table 14: Com1 Data Format ............................................................................................................................... 44
Table 15: Com2 Baud Rate .................................................................................................................................. 44
Table 16: Com2 Data Format ............................................................................................................................... 44
Table 17: Sensor Scale ........................................................................................................................................ 45
Table 18: 24VDC Cable Lengths.......................................................................................................................... 49
Table 19: Analog Output Cable Lengths .............................................................................................................. 49
Table 20: Sensor Cable Lengths .......................................................................................................................... 49
vii
S4000T
Quick Start Guide
Mounting and Wiring
Tools Required
1. “5mm” Allen head wrench to remove enclosure lid (included with gas detector).
2. Flat-head screwdriver maximum 3/16 in (5 mm) width for terminal block connections
(included with gas detector).
3. Adjustable wrench for conduit or cable bgland connections (not included).
The overall and mounting dimensions for the Model S4000T (Figure 1) should be used when
making installation determinations.
Information on Class I location seals can be found in the NEC, Article 501-5.
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: S4000T Outline and Mounting Dimensions
Terminal Connections
The terminal blocks (TB) are located inside the housing and can by accessed by removing the
cover. A label on the inside of the housing cover provides details of all the terminal
connections.
It is recommended that a three-wire (red, black, white) shielded cable be used for making
power and output signal connections on the Model S4000C. 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 Model S4000C Intelligent
Sensor. To connect wiring to the Spring Type terminal block, insert a screwdriver into the
8
S4000T
orange tab and press down (Figure 2), 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.
To connect wiring to the Screw Type terminal block, (Figure 3) use a screwdriver to loosen the
top screw counter clock wise. Insert the wire into the terminal and tighten the top screw clock
wise. Check the hold of the wire by GENTLY tugging it to ensure it is locked in.
Figure 2: Spring Type Terminal Block Operation
Figure 3: Screw Type Terminal Block Operation
NOTE: Power must remain disconnected until all other wiring connections have been made.
The maximum distance between the Model S4000T and the power supply is 2000 feet or 610
meters (each cable run should be as short as possible). See Section 9.2.3 for cable length
specifications. Connect +24VDC 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.
The instrument is now ready to operate. Please consult the manual for more information on the
instrument’s many features.
NOTE: If you have any problems in the set-up or testing of the detector, please refer to the
“Trouble Shooting Section”, or call the factory direct.
9
S4000T
Worldwide service is available by calling:
Lake Forest, California
(24 hr. service)
Toll Free: +1-800-446-4872
Phone: +1-949-581-4464
Fax: +1-949-581-1151
Houston, Texas
Phone: +1-281-855-6000
Fax: +1-281-855-3290
Ireland
Phone: +353-91-751175
Fax: +353-91-751317
Singapore
Phone: +65-6748-3488
Fax: +65-6748-1911
United Arab Emirates
Phone: +971-4-8815751
Fax: +971-4-8817927
United Kingdom
Phone: +44-1625-619583
Fax: +44-1625-619098
10
S4000T
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 S4000T
for Hydrogen Sulfide Gas Detection. While the S4000T 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 S4000T 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.
Hydrogen Sulfide (H2S) is an extremely toxic gas, and exposure may result in a loss of
consciousness or death.
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, but not limited to:
•
Power supplies
•
Control modules
•
Field detection devices
•
Signaling / 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 / testing should be
performed per the manufacturer’s recommendations and instructions.
11
S4000T
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/Malfunction circuit operation should be verified.
Periodic Testing/Calibration of Field Devices
Periodic testing/calibrating should be performed per the manufacturer’s recommendations and
instructions. Testing/Calibrating procedures should include, but not be limited to:
•
Verify zero reading
•
Apply a known concentration of gas, and verify accuracy
•
Verify integrity of all optical surfaces and devices
•
For flame detectors, use the appropriate test lamp
When testing produces results outside of the manufacturer’s specifications, re-calibration or
repair/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, but not limited to:
•
Power supplies
•
Control modules
•
Field detection devices
•
Signaling / 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.
12
S4000T
2.0 Product Description
2.1 General Description
The Model S4000T is an intelligent sensor for the detection of Hydrogen Sulfide (H2S) gas. The
microprocessor-based electronics process information at the sensor site, within an explosionproof 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 WARN condition. Analog signal (4-20mA) optional Dual
Redundant MODBUS communications and relays, provide remote and/or discrete indications of
the sensor’s operation.
The Model S4000T 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, Ex d IIB+H2, T6
•
ATEX: EEx d IIB T6 (Tamb=-40°C to +40°C)
Figure 4: Model S4000T Intelligent Sensor
13
S4000T
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.
All correspondence with General Monitors must specify the equipment part number and serial
number.
The factory tests each unit; however, a complete system checkout is suggested upon initial
installation to ensure system integrity.
WARNING:
Installation and maintenance must be carried out by suitably skilled and
competent personnel only.
WARNING:
The Model S4000T 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
1. “5mm” Allen head wrench to remove enclosure lid (included with gas detector).
2. Flat-head screwdriver maximum 3/16 in (5 mm) width for terminal block connections
(included with gas detector).
3. 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. Generally, the Model S4000T Intelligent Sensor should be easily accessible for
calibration checks.
•
The transmitter should be mounted pointing down to prevent water build-up on the
sensor head.
•
The transmitter should not be placed where contaminating substances may coat it.
•
Although the Model S4000T is RFI resistant, it should not be mounted in close
proximity to radio transmitters or similar equipment.
•
Locate the Model S4000T where prevailing air currents contain the maximum
concentration of gas.
14
S4000T
•
Locate the Model S4000T near possible sources of gas leaks.
•
Observe the Model S4000T’s temperature specification and locate the unit away from
concentrated sources of heat.
•
Transmitters should be mounted 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 materials. Loss of
sensitivity or corrosion may be gradual if such materials are present in low concentrations, or it
may be rapid at high concentrations. The more important materials adversely affecting sensors
are:
•
Silicones (often contained in greases and aerosols)
•
Halides: compounds containing Fluorine, Chlorine, Bromine and Iodine
•
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 Model
S4000T 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 two-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 you are ready to
power the system. SAVE the cap and RE-CAP the sensor anytime the system
power is off for more than one 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 3700 feet (1125) 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. See Section 9.6, for FMRC approval requirements.
15
S4000T
3.4 Mounting and Wiring
WARNING:
The conduit entries should be sealed per the NEC 500-3d, or Canadian Electrical
Code Handbook (Part 1, Section 18-154). Additional benefit of conduit seals is
the prevention of water entering the housing through the conduit entry.
WARNING:
Unused cable entry holes must be sealed with an 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.
The overall and mounting dimensions for the Model S4000T (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 Model S4000T housing be sealed, or contain a drain loop.
Each conduit run from a hazardous location to a non-hazardous location should be sealed so
that gases, vapors, and/or flames cannot pass beyond the seal. The purpose of seals in a
Class I hazardous location, is to prevent the passage of gases, vapors, or flames from one
electrical installation to another, through the conduit system. It is not necessary to seal the
Model S4000T housing to maintain its explosion-proof integrity; however, conduit runs
containing wires attached to the Model S4000T’s relay contacts must be sealed (Section 3.5).
Information on Class I location seals can be found in the NEC, Article 501-5.
Figure 5: S4000T Outline and Mounting Dimensions
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.
16
S4000T
Once correctly installed, the Model S4000T 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 system’s full two-year warranty will be voided if customer personnel or third parties
damage the system 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 and/or ethanol are examples of suitable solvents. The
accessories should be thoroughly dried, with compressed air if necessary, before refitting to the
sensor body.
3.5 Terminal Connections
The terminal blocks (TB) are located inside of the housing and can by accessed by removing
the cover. A label on the inside of the housing cover provides details of all the terminal
connections.
3.5.1 Terminal Block TB1 – Sensor Connections
TB1 contains the four sensor connections, white (W), black (B), red (R) and green (G). Remove
the display board by loosening the two captive screws on the board and lifting it straight up.
Connect the color-coded wires from the sensor to the matching colored terminals on TB1. The
label on the inside of the cover can serve as a guide. Replace the display board, by pressing it
into place, and tightening the two captive screws.
WARNING:
Do not connect +24VDC to TB1. Damage to the electronics or sensor may result.
3.5.2 Terminal Block TB2 – Power and Signal Connections
TB2 contains the connections for Power, Relay Reset, Remote Calibration, MODBUS and 020mA Output Signal. The terminal connections are as follows:
TB2 position
1
2
3
4
5
6
7
8
9
Function
0-20mA Output
CH1 MODBUS CH1 MODBUS +
CH2 MODBUS CH2 MODBUS +
Remote Calibration
Relay Reset
Ground
+24VDC Power
Table 1: TB2 Power and Signal Connections
17
S4000T
It is recommended that a three-wire (red, black, white) shielded cable be used for making
power and output signal connections on the Model S4000C. 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 Model S4000C Intelligent
Sensor. To connect wiring to the Spring Type terminal block, insert a screwdriver into the
orange tab and press down (Figure 6), 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.
To connect wiring to the Screw Type terminal block, (Figure 7) use a screwdriver to loosen the
top screw counter clock wise. Insert the wire into the terminal and tighten the top screw clock
wise. Check the hold of the wire by GENTLY tugging it to ensure it is locked in.
Figure 6: Spring Type Terminal Block Operation
Figure 7: Screw Type Terminal Block Operation
Figure 8: Wire Strip Length
18
S4000T
NOTE: Up to 12 AWG wire can be used if it is carefully stripped (on a Screw Type terminal
only-Figure 8).
3.5.3 DC Power and Ground Connections
The customer must provide Primary DC power, unless one of the following General Monitors’
Modules is being used with the Model S4000T:
•
DT230 Dual-Channel Readout/Relay Display Module
•
TA202A Trip Amplifier Module with a PS002 Power Supply & Relay Module
The following General Monitors’ Modules provide power connections for the Model S4000T, but
need a customer supplied DC source:
•
DT210 Eight-Channel Readout/Relay Display Module
•
TA202A Trip Amplifier Module without a PS002
Since the Model S4000T is designed to operate continuously, a power switch is not included, in
order to prevent accidental system shutdown.
NOTE: Power must remain disconnected until all other wiring connections have been made.
The maximum distance between the Model S4000T and the power supply is 2000 feet or 610
meters (each cable run should be as short as possible). See Section 9.3.3 for cable length
specifications. Connect +24VDC to TB2, position 9. Connect the ground or common wire to
TB2, position 8. For making power and ground connections to display devices see Table 2 and
Table 3.
FROM
TO
Model
S4000T
Model
DT210
Model
DT230
Model
TA202A
TB2-8
“COM”
Rear
COMMON
Rear
Pin 3 or 6
“COM”
Rear
Pin 30d or
30z
Table 2: Ground or Common Connections
FROM
TO
Model
S4000T
Model
DT210
Model
DT230
Model
TA202A
TB2-9
“+24
VDC”
Rear
CH 1 - 8
24V
Rear
Pin 4 or 7
“DC OUT”
Rear
Pin 28d or
28z
Table 3: Power Connections
19
S4000T
3.5.4 Analog Signal Connections
The Model S4000T Intelligent Transmitter provides a 4 to 20mA output signal. This signal can
be sent up to 9000 feet (2740 meters) to:
•
A General Monitors readout/relay display module, or
•
An industrial analog to digital converter, or
•
A computer-based monitor,
•
A PLC, or
•
A DCS.
The 4 to 20mA signal provides for control room or other locations remote to the Model S4000T to
display indications of operation and alarm conditions. To connect the 4 to 20mA output signal with
another unit, connect the wire into TB2, position 1, labeled 4-20mA OUT. For making output
signal connections to display devices, refer to the specific manual for that device (Table 4).
FROM
TO
Model
S4000T
Model
DT210
Model
DT230
Model
TA202A
TB2-1
4-20mA
Output
Rear
CH 1 – 8
4-20mA
Rear
Pin 2 or 5
Analog In
Rear
Pin 26d or
26z
Table 4: Analog Signal Connections
If a device other than a General Monitors readout/relay display module is being used, the DC
ground, COM, of both systems must be connected together.
3.5.5 Terminal Block TB3 – Relay Connections
TB3 contains the connections for the Relay Contacts (optional). The function for the Warn and
Alarm Relay connections vary, according to the normal state of the relay. Use the following as a
guide for determining the Normally Open (NO) and the Normally Closed (NC) contact:
TB3 position
1
2
3
Relay Contact (De-Energized)
Normally Closed
Common
Normally Open
Relay Contact (Energized)
Normally Open
Common
Normally Closed
Table 5: Alarm Relay Connections
TB3 position
4
5
6
Relay Contact (De-Energized)
Normally Closed
Common
Normally Open
Relay Contact (Energized)
Normally Open
Common
Normally Closed
Table 6: Warn Relay Connections
20
S4000T
TB3 position
7
8
9
Relay Contact (Energized)
Normally Open
Common
Normally Closed
Table 7: Fault Relay Connections
*NOTE: Fault relay is normally energized. Relay will change state after power up.
WARNING:
Contact with PCB components should be avoided to prevent damage by static
electricity. All wire connections are made to the Terminal Blocks.
WARNING:
Relay contacts must be protected against transient and over voltage conditions
(Figure 9).
Figure 9: Relay Protection for DC and AC Loads
North American Approved Applications - The ALARM relay contact ratings are 8A @ 250 VAC
and 8A @ 30 VDC resistive max.
European Union (EU) Approved Applications - The ALARM relay contact ratings are 8A, 30 V
RMS/42.4 V peak or 8A @ 30 VDC resistive max.
3.5.6 European Union (EU) Approved Applications
Interconnecting cables must have an overall screen, or screen and armor. Cables BS5308 Part
2, Type 2, or equivalent are suitable.
NOTE: The terms ‘screen’ and ‘shield’ are equivalent for the purpose of this manual. The
cable armor must be terminated in a suitable cable gland at the detector, to ensure a
positive electrical connection.
3.5.7 Cable termination in the non-hazardous area
•
The cable armor must be connected to safety earth in the safe area.
•
The cable screen (drain wire) must be connected to an instrument earth in the safe
area.
21
S4000T
•
The power supply OV return must be connected to an instrument earth in the safe
area.
•
The interconnecting cables should be segregated from power and other noisy cables.
Avoid proximity to cables associated with radio transmitters, welders, switch mode
power supplies, inverters, battery chargers, ignition systems, generators, switch gear,
arc lights and other high frequency or high power switching process equipment. In
general, maintain separation of at least 1 meter between instrument and other cables.
Greater separations are required where long parallel cable runs are unavoidable. Avoid
running instrument cable trenches close to lightning conductor earthing pits.
•
Complete all cable insulation testing before connecting the cable at either end.
WARNING:
Under NO circumstances should equipment be connected or disconnected when
under power. This is contrary to hazardous area regulations and may lead to
serious damage to the equipment. Equipment damaged in this manner is not
covered under warranty.
3.6 Maintaining the X/P Integrity
The Model S4000T is rated explosion-proof for the following hazardous locations:
•
CSA/FM: Class I, Division 1, Groups B, C, D and Class I, Zone 1, Ex d IIB+H2, T6 and
•
ATEX: EEx d IIB T6 (Tamb=-40°C to +40°C)
Some of the factors that influence the explosion-proof integrity of the Model S4000T housing
are:
•
Strength of the enclosure material
•
Thickness of the enclosure walls
•
Flame path between the housing and cover
•
Flame path of threaded joints
The acceptable limits for explosion-proof housings that are used in Class I hazardous locations
are defined in CSA Standard C22.2 No.30-M1986, FM 3615 and EN50014.
Anytime the cover of the Model S4000T housing is removed or the cover bolts are loosened,
the flame path between the lid and the housing is affected. If power is to be left on while
removing the cover or loosening the cover bolts on the Model S4000T, it will be necessary to
declassify the area.
When replacing the cover, the gap between the lid and the housing should be less than .0015
inch (.038 mm). Make sure that the flame path is clear of dirt and debris before replacing the
cover. This can be verified by tightening the cover bolts to a torque setting of 50 inch-pounds or
by using a feeler gauge to ensure the gap between the cover and the housing is less than
.0015 inch (.038 mm).
There are four entry holes, one each on the left and right sides, and two on the bottom of the
Model S4000T housing. These holes are dedicated for the sensor, the reset switch and conduit.
Each hole is tapped for ¾” NPT threads. If a particular entry hole is not used, it must be
22
S4000T
plugged during operation in the field. The factory installs plugs in the unused entry holes,
except one. A red plastic cap is placed into the remaining hole and must be removed before
conduit can be attached to the housing.
The Model S4000T will have the following items placed in the three remaining entry holes, at
the factory:
•
A sensor, if present (otherwise a red plastic cap)
•
A reset switch, if present (otherwise an aluminum housing plug – optional)
•
An aluminum housing plug
The sensor, reset switch and aluminum-housing plug have seven threads. Each of these
components is screwed into the housing using five to seven turns. If it becomes necessary to
replace the sensor, reset switch and/or the aluminum-housing plug, the user must use five to
seven turns to ensure the explosion-proof integrity of the housing is maintained.
23
S4000T
4.0 Operation
4.1 Start-Up Checklist
Prior to starting the system, verify the following:
1. Inhibit any external devices, such as Trip Amplifiers, PLC’s, or DCS systems.
2. Verify that the optional settings are set for the desired configuration.
3. Verify that the unit is properly mounted. Ensure the conduit/cable gland entries are
pointed downward.
4. Verify that the signal wiring is correct.
5. Verify that the power supply is connected properly. The Model S4000T is powered by
+24VDC (20 to 36 VDC voltage range). The detector will output a low voltage fault (F6)
at 18.5 VDC or below.
6. Make sure the lid is securely installed or the area has been de-classified.
4.2 Start-Up
Before applying power to the system for the first time, all wiring connections should be checked
for correctness and the housing cover replaced. Upon first power-up, the sensor may take up to
fifteen minutes to stabilize.
At the initial application of power, the unit will test all of the LED segments by displaying “88.8”.
The software revision letter will then be displayed for a few seconds. The unit will then enter
Operational Mode and the current gas concentration at the sensor will be displayed. For details
of Calibrating and Gas Checking the unit, see Sections 4.5 and 4.6.
4.3 Relay Reset
If the Warn and Alarm relays are configured as latching, they must be manually reset, after an
alarm occurs. This can be accomplished by three different methods:
1. The relays can be reset via the MODBUS Interface (Section 8.8.15).
2. The relays can be reset via the magnetic switch using a magnet. Place the magnet
over the GM Logo on the cover of the unit. After three seconds the display will show
“rSt”. Remove the magnet at this time and the relays will be reset (Figure 10).
24
S4000T
Figure 10: Relay Reset
3. The relays can be reset via the Remote Reset input terminals on TB2. Connect a
normally open switch between terminal TB2-7 and TB2-8. Closing the switch
momentarily will reset the relays. General Monitors explosion-proof switch, P/N 300511 can be used for this purpose. See Section 9.5 for ordering instructions.
NOTE: Red LED’s above and below the digital display indicate that the Alarm and Warn relays
are active. Latching relays can only be reset if the gas concentration has fallen below
the respective relay set point.
4.4 User Selectable Options
The Model S4000T Intelligent Sensor includes many selectable options to provide the user with
the most flexible H2S gas detector possible. These options include Selectable Sensor Range,
Warn and Alarm Relay Set Points and Configuration, and MODBUS Communications Settings.
These allow the unit to operate with a wide variety of PLC and DCS Systems. The following
sections explain the available options and how they can be customized.
A flow diagram is included to help the user in understanding the process of reviewing and
changing the available options (Figure 11).
NOTE: If the unit was ordered without relays or MODBUS communications, changing the relay
or MODBUS settings will have no effect on the operation of the unit.
25
S4000T
4.4.1 Model S4000T User Menu Structure
Operate
“rSt”
Reset
Relays
“AC”
“- -”
N
Enter Gas Check Mode
“SE”
N
Set Sensor Range
20,50,100 ppm
“Sr”
Enter Calibration
Mode
“Co”
N
Gas
Detected?
“Fi”
N
Enable
“Fi”
Disable
“Fi”
Reset
Sensor Life? N
“Lo”
Y
Y
Gas
Removed?
Reset Sensor
Life to 100%
Warm Relay
“Hi”
Alarm Relay
Energized or
De-Energized
Latching or
Non-Latching
Setpoint
“Fi”
Energized or
De-Energized
Latching or
Non-Latching
Setpoint
“Fi”
Apply Gas and
Remove When
Complete
“CH1”
Modbus
Channel 1
“CH2”
Modbus
Channel 1
Baud Rate
Data Format
Address
“Fi”
Baud Rate
Data Format
Address
“Fi”
N
“Fi”
Finished
Y
Figure 11: User Menu Structure
NOTE: “Co” represents Calibration Output. When “Co” is enabled and calibration is successful,
the analog output goes from 1.5 mA to 3.2 mA for 5 seconds, settling at the desired
value of 4mA.
4.4.2 Sensor Range
The Sensor Range is selectable between 0-20ppm, 0-50ppm, or 0-100ppm depending on the
installed sensor. To adjust the Sensor Range of the Model S4000T, apply the magnet to the
GM Logo on the cover of the unit until “SE” is displayed, then remove the magnet. This puts the
unit into Setup Mode. After a few seconds “Sr” will be displayed. Apply and remove the magnet
to adjust the Sensor Range. The current Sensor Range will be displayed. To change the sensor
26
S4000T
range, apply and remove the magnet repeatedly, until the desired range is displayed. Once the
desired range is displayed, wait 3 seconds and “Fi” will be displayed. Apply and remove the
magnet, to return to the next level of the Setup menu. When “Fi” is displayed again, apply and
remove the magnet to return to normal operation.
NOTE: When the Sensor Range is changed, the Warning and Alarm set points are
automatically scaled to the new range. The unit must now be calibrated to the new
range (Section 4.6.1).
4.4.3 Warning Relay Settings
To adjust the Warning Relay Settings of the Model S4000T, apply the magnet to the GM Logo
on the cover of the unit until “SE” is displayed, then remove the magnet. This puts the unit into
Setup Mode. After a few seconds “Lo” will be displayed. Apply and remove the magnet to
change the Warning or “Low” alarm settings.
First, the Energized/De-Energized state of the relay is displayed by either “En” or “dE” being
displayed respectively. Apply and remove the magnet until the desired state is displayed.
After a few seconds the Latching/Non-Latching state of the relay is displayed by either “La” or
“nL”. Apply and remove the magnet until the desired state is displayed.
After a few seconds, the current Warning relay set point is displayed. Apply and remove the
magnet until the desired set point is displayed. Once the desired set point value is displayed,
wait 3 seconds and “Fi” will be displayed. Apply and remove the magnet to return to the next
level of the Setup menu. When “Fi” is displayed again, apply and remove the magnet to return
to normal operation.
The default Warning relay settings are: non-latching, de-energized, 30% FS set point.
The maximum allowable set point is 50ppm.
NOTE: The Warn Relay set point cannot be set higher than the Alarm Relay set point.
4.4.4 Alarm Relay Settings
To adjust the Alarm Relay Settings of the Model S4000T, apply the magnet to the GM Logo on
the cover of the unit until “SE” is displayed, then remove the magnet. This puts the unit into
Setup Mode. After a few seconds “Hi” will be displayed. Apply and remove the magnet, to
change the Alarm or “High” alarm settings.
First, the Energized/De-Energized state of the relay is displayed by either “En” or “dE” being
displayed respectively. Apply and remove the magnet, until the desired state is displayed.
After a few seconds the Latching/Non-Latching state of the relay is displayed by either “La” or
“nL”. Apply and remove the magnet, until the desired state is displayed.
After a few seconds the current Alarm relay set point is displayed. Apply and remove the
magnet until the desired set point is displayed. Once the desired set point value is displayed,
wait 3 seconds and “Fi” will be displayed. Apply and remove the magnet to return to the next
level of the Setup menu. When “Fi” is displayed again, apply and remove the magnet, to return
to normal operation.
27
S4000T
The default Alarm relay settings are: latching, de-energized, 60% FS set point.
NOTE: The Alarm Relay set point cannot be set lower than the Warning Relay set point.
4.4.5 MODBUS Channel 1 Settings
To adjust the MODBUS Channel 1 settings of the Model S4000T, apply the magnet to the GM
Logo on the cover of the unit until “SE” is displayed, then remove the magnet. This puts the unit
into Setup Mode. After a few seconds “CH1” will be displayed. Apply and remove the magnet,
to change the MODBUS Channel 1 settings.
First, the current Baud Rate MODBUS Channel 1 is displayed. If another baud rate is to be
selected, apply and remove the magnet until the desired baud rate is displayed. The choices
are: 19.2k baud “19.2”, 9600 baud “96”, 4800 baud “48”, or 2400 baud “24”.
After a few seconds, the current Data Format for MODBUS Channel 1 is displayed. If another
data format is to be selected, apply and remove the magnet until the desired data format is
displayed. The choices are: 8-N-1 “8n1”, 8-N-2 “8n2”, 8-E-1 “8E1”, or 8-O-1 “8O1”.
After a few seconds, the current address for MODBUS Channel 1 is displayed. Apply and
remove the magnet until the desired address is displayed. Once the desired address is
displayed, wait 3 seconds and “Fi” will be displayed. Apply and remove the magnet, to return to
the next level of the Setup menu. When “Fi” is displayed again, apply and remove the magnet,
to return to normal operation.
Default settings for Channel 1 are: address 1, 19.2k baud, 8-N-1.
NOTE: The address can be adjusted from 1 - 247. Channel 1 and Channel 2 addresses may
be the same.
4.4.6 MODBUS Channel 2 Settings
To adjust the MODBUS Channel 2 Settings of the Model S4000T, apply the magnet to the GM
Logo on the cover of the unit until “SE” is displayed, then remove the magnet. This puts the unit
into Setup Mode. After a few seconds “CH2” will be displayed. Apply and remove the magnet to
change the MODBUS Channel 2 settings.
First, the current Baud Rate MODBUS Channel 2 is displayed. If another baud rate is to be
selected, apply and remove the magnet until the desired baud rate is displayed. The choices
are: 19.2k baud “19.2”, 9600 baud “96”, 4800 baud “48”, or 2400 baud “24”.
After a few seconds, the current Data Format for MODBUS Channel 2 is displayed. If another
data format is to be selected, apply and remove the magnet until the desired data format is
displayed. The choices are: 8-N-1 “8n1”, 8-N-2 “8n2”, 8-E-1 “8E1”, or 8-O-1 “8O1”.
After a few seconds, the current address for MODBUS Channel 2 is displayed. Apply and
remove the magnet until the desired address is displayed. Once the desired address is
displayed, wait 3 seconds and “Fi” will be displayed. Apply and remove the magnet to return to
the next level of the Setup menu. When “Fi” is displayed again, apply and remove the magnet
to return to normal operation.
28
S4000T
Default settings for Channel 2 are: address 2, 19.2 kbaud, 8-N-1.
NOTE: The address can be adjusted from 1 - 247. Channel 1 and Channel 2 addresses may
be the same.
4.5 Gas Check Mode
The sensor’s response can be checked without activating external alarms by placing the Model
S4000T in Gas Check Mode. In this mode, the alarm relays are inhibited and the analog output
is fixed at 1.5mA.
4.5.1 Procedure for Checking the Calibration:
Place the magnet over the GM Logo on the cover of the Model S4000T. Remove the magnet
when a flashing pair of bars, “- -” (Figure 12), appear on the display (about ten seconds). Apply
the test gas to the sensor, and the value of the gas concentration will be indicated by the
flashing display and should stabilize in one to two minutes.
Figure 12: Gas Check
When the reading has stabilized and the test is complete, remove the gas and the unit will
return to normal operation, when the concentration drops below 5% full-scale. If, after the
reading has stabilized the sensor is to be calibrated, simply apply the magnet to the GM Logo
on the housing cover, and the unit will enter Calibration Mode.
Gas Check Mode can be aborted if gas has not been applied to the sensor. Simply reapply the
magnet to the GM Logo on the cover and the unit will return to normal operation.
NOTE: The test gas concentration must be at least 10% full-scale before the unit will complete
the Gas Check sequence. If the Model S4000T is placed in the Gas Check mode and
no gas is applied for twelve minutes, the unit will revert to a Fault condition. Reapplying the magnet over the GM Logo will return the unit to normal operation.
4.6 Calibration
General Monitors recommends that the Model S4000T Intelligent Sensor be calibrated one
hour after start-up, and again 24 hours after initial start-up, and that the calibration be checked
at least every ninety (90) days, to ensure system integrity. General Monitors is not implying that
the customer should expect problems with sensor life or stability, but “frequent” calibration
checks merely ensure the integrity of the life protecting equipment.
The above statement is not intended to discourage the customer from checking calibration
more frequently. Frequent calibration checks are recommended for environments that have
29
S4000T
problems, such as mud collecting on the sensor head, sensors accidentally being painted over,
etc.
General Monitors recommends that a calibration schedule be established and followed. A
logbook should also be kept showing calibration dates and dates of sensor replacement.
4.6.1 Calibration Procedure
If Hydrogen Sulfide (H2S) gas is suspected to be present, it will be necessary to purge the
sensor environment with clean air.
Entering Calibration Mode automatically disables the alarm circuits by sending a 1.5mA output
signal and disabling the Warn and Alarm relays, if present. This will also prevent activation of
the remote relay contacts when using a General Monitors Readout/Relay Display Module with
the Model S4000T.
To enter Calibration Mode, place the magnet over the GM Logo on the cover of the unit (Figure
4) and hold it there until “AC” (Figure 13) appears on the display (about ten seconds). The
display will flash the Remaining Sensor Life (Section 4.6.3) for a few seconds. Ensure that the
sensor is seeing clean air during this time.
Figure 13: Automatic Calibration Mode
Apply the calibration gas concentration to the sensor (50% FS of the desired range of H2S).
The display will change from “AC” (Automatic Calibration) to “CP” (Calibration in Progress)
indicating that the sensor is responding to the calibration gas (Figure 14).
Figure 14: Calibration in Progress Mode
After three to five minutes, the display will change from “CP” to “CC” (Figure 15), indicating that
the calibration is complete.
Figure 15: Calibration Complete Mode
Remove the gas and wait for the unit to return to normal operation. The display will indicate a
few percent full-scale and then drop to “0”.
30
S4000T
The unit is now calibrated and the new SPAN value has been stored in the non-volatile memory
(EEPROM).
4.6.2 Aborting Calibration
If calibration is to be aborted, and gas has not been applied, wait ninety seconds and reapply
the magnet. The unit will return to normal operation with the previous calibration values
unchanged.
NOTE: Once gas has been applied, it is not possible to abort a calibration.
If the Model S4000T is placed in the Calibration Mode, and no gas is applied for twelve
minutes, the unit will revert to a Fault (F2) condition. Re-applying the magnet over the GM Logo
will return the unit to operational mode with the previous calibration values unchanged.
4.6.3 Remaining Sensor Life
The Model S4000T Intelligent Sensor provides an estimate of remaining sensor life, in percent
remaining, to provide the user with an early warning of the need for sensor replacement. The
remaining sensor life is updated each time the unit is calibrated. The current remaining sensor
life estimate is displayed during the zeroing portion of a calibration sequence. It can also be
read via the MODBUS interface (Section 8.0).
NOTE: The remaining sensor life provides an estimate of the amount of life remaining for the
sensor. This estimate can be affected by many factors, including environmental
conditions, poisons, etc. It should be used only as an estimate for preventive
maintenance and logistic purposes.
4.6.4 Initializing the Remaining Sensor Life
The remaining sensor life estimate must be initialized each time a new Hydrogen Sulfide
Sensor is installed. The initialization should be done during the first calibration of a newly
installed sensor. After the sensor has been on power for a minimum of one hour, enter
calibration mode as described in Section 4.6. While the display is flashing the remaining sensor
life estimate during zeroing, apply the magnet to the GM Logo on the cover. The flashing
number will change to “100”, indicating the sensor has 100% of remaining sensor life. Complete
the calibration per Section 4.6.1.
4.7 Calibration Equipment
4.7.1 Breaker Bottles and Ampoules
General Monitors offers ampoules with breaker bottles as a method of reliably introducing
calibration gas to the Model S4000T. The ampoule is placed inside the breaker bottle into the
breaker slot, and the breaker bottle is placed over the sensor. The ampoule should contain
50% FS of H2S of the sensor range. Follow the calibration procedure in Section 4.6. When the
display indicates “AC”, break the ampoule by turning the thumbscrew on the side of the breaker
bottle clockwise. The display will change to “CP” indicating that the sensor is seeing the gas.
When the display reads “CC”, the calibration is complete. Remove the breaker bottle and allow
the sensor to see clean air. It will return to normal operation once the gas at the sensor is below
5% of full-scale. See Section 9.5 for available equipment.
31
S4000T
4.7.2 H2S Portable Purge Calibrator
An alternate method for introducing calibration or test gas to the Model S4000T is available.
The H2S Portable Purge Calibrator is a compact, practical, accurate and safe system for field
calibration of H2S Sensors. The bottle is filled with a hydrogen sulfide (H2S) in air mixture and is
available in 7 concentrations. The temperature limitation for operation and storage is 0°F to
+130°F (-18°C to +54°C).
NOTE: Do not store the cylinder with the regulator fully engaged in the cylinder valve.
Use the calibration procedure listed below for H2S Portable Purge calibrations:
Make sure the Portable Purge Calibrator contains a gas concentration equivalent to 50% of fullscale for the unit that is going to be calibrated.
1. Ensure that the sensor is seeing clean air. If it is suspected that hydrogen sulfide gas is
present, it will be necessary to purge the sensor environment with clean air.
2. Place the gas cup over the sensor and initiate the calibration sequence, by placing the
magnet over the GM Logo on the cover of the unit.
3. When the letters “AC” appear in the display window remove the magnet and apply the
calibration gas (50% of full-scale) by opening the valve on the cylinder.
4. When the sensor begins to see the gas, the display will change from “AC” to “CP” to
indicate “Calibration in Progress”.
5. When the calibration sequence is complete, the display will change from “CP” to “CC”
to indicate “Calibration Complete”.
6. Remove the gas by closing the valve on the cylinder, and remove the cup allowing the
sensor to see clean air. The display will change from “CC” to indicate a few parts per
million (ppm) and then drop to “0”.
The unit is now calibrated and the new values have been stored in the EEPROM (non-volatile
memory). See Section 9.5 for available equipment.
32
S4000T
5.0 Maintenance
5.1 General Maintenance
WARNING:
Disconnect or inhibit external devices such as Trip Amplifiers, PLC’s, or DCS
systems before performing any maintenance.
European Union (EU) Approved Applications: The following grease compound is recommended
for use: PBC Polybutylcuprysil, (or equivalent), which has BASEEFA Health & Safety Executive
component approval No. 1051U for use as a jointing compound on flameproof electrical
enclosures. This is available from General Monitors. The neoprene rubber gasket should also
be lubricated with Type P80 lubricant available from General Monitors (P/N 610-010).
5.2 Storage
The Model S4000T H2S Gas Detector should be stored in a clean, dry area and within the
temperature and humidity ranges quoted in the Appendix under Environmental Specifications.
Insert red dust caps into any vacant cable entry holes.
33
S4000T
6.0 Troubleshooting
CAUTION:
Component level repair must be undertaken either by General Monitors’
personnel, or by competent authorized service engineers. SMT PCB repair shall
only be performed at a General Monitors’ facility. Failure to comply with this
requirement will invalidate the warranty.
Be sure to inhibit or disconnect external alarm wiring before making any check, which might
send the unit into alarm, if an alarm condition will cause a problem.
6.1 Fault Codes & Their Remedies
The Model S4000T has self-diagnostics incorporated into the microprocessor’s program. If a
fault is detected, the output signal will drop to 0mA, the Fault relay will de-energize and a fault
code will be displayed. The output signal will inform a remote display module that the Model
S4000T is in the Fault Mode. The display will indicate a fault code that can be viewed at the
sensor site.
There are nine fault conditions that are monitored by the microprocessor as follows:
6.1.1 F2 - Failed to Complete the Calibration
This fault will occur if the unit is placed in the calibration mode and no gas has been applied
within twelve minutes, or if gas has been left on for more than 12 minutes.
ACTION – Remove gas, if present. Apply magnet to GM Logo on the cover to clear fault. Recalibrate, if necessary.
6.1.2 F3 - EPROM Checksum Error
This fault indicates that the contents of the Model S4000T’s program memory have changed.
This usually occurs when powering the unit up after a lightning strike or large voltage transient
on the power or signal lines to the unit.
ACTION - The unit must be returned to the factory or authorized service center for repair.
6.1.3 F4 - Sensor Heater Open Error
This fault indicates that one of the sensor circuit leads is open-circuited.
ACTION - Check the integrity of all sensor connections, and ensure that the cable from the
Model S4000T to the remote sensor is not damaged. If this does not correct the problem,
replace the sensor and recalibrate.
6.1.4 F5 - Sensor Heater Shorted Error
This fault indicates that one of the sensor circuit leads is short-circuited.
ACTION - Check the integrity of all sensor connections, and ensure that the cable from the
Model S4000T to the remote sensor is not damaged. If this does not correct the problem,
replace the sensor and recalibrate.
34
S4000T
6.1.5 F6 - Low Supply Voltage
This fault occurs if the supply voltage at the S4000T drops below +18.5VDC.
ACTION - Ensure that the supply voltage is at least +20VDC at the Model S4000T.
NOTE: With long supply leads, a considerable voltage drop may occur, due to the electrical
resistance of the leads. The maximum cable resistance, which the Model S4000T can
tolerate, is dependent on the supply voltage. A maximum of 20 ohms per conductor (40
ohms loop), at +24VDC minimum, or a maximum of 10 ohms per conductor (20 ohms
loop), at +20VDC minimum.
6.1.6 F7 - EEPROM Verification Failure
This fault occurs when an attempt to verify the setup/calibration parameters just written to the
EEPROM memory fails.
ACTION - The unit must be returned to the factory or authorized service center for repair.
6.1.7 F8 - Failure to Complete Setup
This fault occurs if the unit is left in setup mode for more than 6 minutes.
ACTION - Exit setup mode. Enter setup mode again if it is necessary, to change any user
selectable options.
6.1.8 F9 - Gas Check Period Exceeded
If the Model S4000T is left in the gas check mode for more than twelve minutes with Test Gas
applied, this fault will occur.
ACTION - Place the magnet over the GM Logo on the cover to return the unit to normal
operation.
NOTE: Anytime a sensor is replaced, the unit should be disconnected from all alarms, as the
unit may go upscale upon power-up.
6.1.9 F10 – Switch Error
This fault occurs if either the remote test, remote calibrate, or magnetic switch are closed for
more than two minutes.
ACTION – Check the wiring on the Remote Reset and Remote Calibrate switches. Once the
short circuit is cleared, the unit will return to normal operation. If the magnetic switch is shorted,
the unit must be returned to the factory or to an authorized service center for service.
35
S4000T
7.0 Customer Support
7.1 General Monitors’ Offices
Area
UNITED STATES
Phone/Fax/Email
Toll Free: +1-800-446-4872
Phone: +1-949-581-4464
Fax:
+1-949-581-1151
Email: info@generalmonitors.com
Corporate Office:
26776 Simpatica Circle
Lake Forest, CA 92630
9776 Whithorn Drive
Houston, TX 77095
Phone: +1-281-855-6000
Fax:
+1-281-855-3290
Email: gmhou@generalmonitors.com
UNITED KINGDOM
Heather Close
Lyme Green Business Park
Macclesfield, Cheshire,
United Kingdom, SK11 0LR
IRELAND
Ballybrit Business Park
Galway, Republic of Ireland
SINGAPORE
No. 2 Kallang Pudding Rd.
#09-16 Mactech Building
Singapore 349307
MIDDLE EAST
LOB12, #G20
P.O. Box 61209
Jebel Ali, Dubai
United Arab Emirates
Phone: +44-1625-619-583
Fax:
+44-1625-619-098
Email: info@generalmonitors.co.uk
Phone: +353-91-751175
Fax:
+353-91-751317
Email: info@gmil.ie
Phone: +65-6-748-3488
Fax:
+65-6-748-1911
Email: genmon@gmpacifica.com.sg
Phone: +971-4-8815751
Fax:
+971-4-8817927
Email: gmme@emirates.net.ae
Table 8: GM Locations
36
S4000T
8.0 MODBUS Interface
8.1 Baud Rate
The Baud Rate is selectable via the MODBUS Communications Interface. The selectable baud
rates are 19200, 9600, 4800, or 2400 bits per second.
8.2 Data Format
The Data Format is selectable via the MODBUS Communications Interface. The selectable
data formats are as follows:
Data Bits
8
8
8
8
Parity
None
Even
Odd
None
Stop Bit
1
1
1
2
Format
8-N-1
8-E-1
8-O-1
8-N-2
Table 9: Data Format
8.3 MODBUS Read Status Protocol (Query/Response)
8.3.1 MODBUS Read Query Message
Byte
1st
2nd
3rd
4th
5th
6th
7th
MODBUS
Slave Address
Function Code
Starting Address Hi**
Starting Address Lo**
No. Of Registers Hi
No. Of Registers Lo
CRC Lo
Range
1-247* (Decimal)
03
00
00-FF (Hex)
00
01
00-FF (Hex)
Referenced to S4000T
S4000T ID (Address)
Read Holding Registers
Not Used by S4000T
S4000T Commands
Not Used by S4000T
No. Of 16 Bit Registers
CRC Lo Byte
8th
CRC Hi
00-FF (Hex)
CRC Hi Byte
*NOTE: Address 0 is reserved for broadcast mode and will not be supported at this time.
** NOTE: Start Address can be a maximum of 9999 Address Locations (0000-270E).
8.3.2 MODBUS Read Response Message
Byte
1st
2nd
3rd
4th
5th
6th
7th
MODBUS
Slave Address
Function Code
Byte Count
Data Hi
Data Lo
CRC Lo
CRC Hi
Range
1-247* (Decimal)
03
02
00-FF (Hex)
00-FF (Hex)
00-FF (Hex)
00-FF (Hex)
37
Referenced to S4000T
S4000T ID (Address)
Read Holding Registers
No. Of Data Bytes
S4000T Hi Byte Status Data
S4000T Lo Byte Status Data
CRC Lo Byte
CRC Hi Byte
S4000T
8.4 MODBUS Write Command Protocol (Query/Response)
8.4.1 MODBUS Write Query Message
Byte
1st
2nd
3rd
4th
5th
6th
7th
8th
MODBUS
Slave Address
Function Code
Register Address Hi
Register Address Lo
Preset Data Hi
Preset Data Lo
CRC Lo
CRC Hi
Range
1-247* (Decimal)
06
00
00-FF (Hex)
00-FF (Hex)
00-FF (Hex)
00-FF (Hex)
00-FF (Hex)
Referenced to S4000T
S4000T ID (Address)
Preset Single Register
Not Used by S4000T
S4000T Commands
S4000T Hi Byte Command Data
S4000T Lo Byte Command Data
CRC Lo Byte
CRC Hi Byte
*NOTE: Address 0 is reserved for broadcast mode and will not be supported at this time.
**NOTE: Start Address can be a maximum of 9999 Address Locations (0000-270E).
8.4.2 MODBUS Write Response Message
Byte
1st
2nd
3rd
4th
5th
6th
7th
8th
MODBUS
Slave Address
Function Code
Register Address Hi
Register Address Lo
Preset Data Hi
Preset Data Lo
CRC Lo
CRC Hi
Range
1-247* (Decimal)
06
00
00-FF (Hex)
00-FF (Hex)
00-FF (Hex)
00-FF (Hex)
00-FF (Hex)
Referenced to S4000T
S4000T ID (Address)
Preset Single Register
Not Used by S4000T
S4000T Commands
S4000T Hi Byte Command Data
S4000T Lo Byte Command Data
CRC Lo Byte
CRC Hi Byte
8.5 Function Codes Supported
Function Code 03 (Read Holding Registers) will be used to read status from the slave unit.
Function Code 06 (Preset Single Register) will be used to write a command to the slave unit.
8.6 Exception Responses and Exception Codes
8.6.1 Exception Response
In a normal communications query and response, the master device sends a query to the
S4000T and the S4000T receives the query without a communications error and handles the
query normally within the master device’s allowable timeout. The S4000T then returns a normal
response to the master. An abnormal communications produces one of four possible events:
1. If the S4000T does not receive the query due to a communications error, then no
response is returned from the S4000T and the master device will eventually process a
timeout condition for the query.
2. If the S4000T receives the query, but detects a communication error (CRC, etc.), then
no response is returned from the S4000T and the master device will eventually process
a timeout condition for the query.
3. If the S4000T receives the query without a communications error, but cannot process
38
S4000T
the response to the master within the master’s timeout setting, then no response is
returned from the S4000T. The master device will eventually process a timeout
condition for the query. In order to prevent this condition from occurring, the
maximum response time for the S4000T is 200 milliseconds. Therefore, the
master’s timeout setting should be set to 200 milliseconds or greater.
4. If the S4000T receives the query without a communications error, but cannot process it
due to reading or writing to a non-existent S4000T command register, then the S4000T
will return an exception response message informing the master of the error.
The exception response message (ref. No. 4 above) has two fields that differentiate it from a
normal response:
Byte
1st
2nd
3rd
4th
5th
MODBUS
Slave Address
Function Code
Exception Code
CRC Lo
CRC Hi
Range
1-247* (Decimal)
83 or 86 (Hex)
01 - 06 (Hex)
00-FF (Hex)
00-FF (Hex)
Referenced to S4000T
S4000T ID (Address)
MSB is set with Function Code
Appropriate Exception Code (See Below)
CRC Lo Byte
CRC Hi Byte
8.6.2 Exception Code
Exception Code Field: In a normal response, the S4000T returns data and status in the data
field, which was requested in the query from the master. In an exception response, the S4000T
returns an exception code in the data field, which describes the S4000T condition that caused
the exception. Below is a list of exception codes that are supported by the S4000T:
Code
01
Name
Illegal Function
02
Illegal Data Address
03
Illegal Data Value
04
Slave Device Failure
05
Acknowledge
06
Device Busy
Description
The function code received in the query is not an
allowable action for the S4000T
The data address received in the query is not an
allowable address for the S4000T.
A value contained in the query data field is not an
allowable value for the S4000T.
An unrecoverable error occurred while the S4000T
was attempting to perform the requested action.
The S4000T has accepted the request and is
processing it, but a long duration of time will be
required to do so. This response is returned to prevent
a timeout error from occurring in the master.
The S4000T is engaged in processing a long-duration
program command. The master should retransmit the
message later when the slave is free.
Table 10: Exception Codes
39
S4000T
8.7 S4000T Command Register Locations
Parameter
Analog
Mode
Status/Error
Not Used
Unit Type
Software Rev
Status Block
Not Used
Alarm
Settings
Warn
Settings
Com1 Addr.
Com1 Baud
Com1 Data
Format
Com2 Addr.
Com2 Baud
Com2 Data
Format
Not Used
Reset Alarms
Sensor Life
Sensor Scale
HazardWatch
(Co)
Not Used
Total Receive
Errors
Bus Activity
Rate %
Function
Code Errors
Starting Addr.
Errors
Function
0-20mA Current Output
Indicates and Controls Mode
Indicates Errors
N/A
Identifies the S4000T in
Decimal
Indicates the Software
Revision
Returns Analog, Mode, Status,
Error, and Sensor Life
N/A
Read or change settings for
the high alarm
Read or change settings for
the low alarm
Read or change settings for
the Com1 Address
Read or change settings for
the Com1 Baud Rate
Read or change settings for
the Com1 Data Format
Read or change settings for
the Com2 Address
Read or change settings for
the Com2 Baud Rate
Read or change settings for
the Com2 Data Format
N/A
Reset any latched alarms
Read the Remaining Sensor
Life
Change the Scale for the H2S
sensors on the S4000T
Indicates Calibration Success
N/A
Total # of Receive Errors
Bus Activity Rate in % of This
Addressed Node vs. Other
Addressed Nodes
Total # of Function Code
Errors
Total # of Starting Address
Errors
Bit
Access
R
R/W
R
Register
Address
0000
0001
0002
Value
16-Bit
R
0004
Master I/O
Address
40001
40002
40003
40004
40005
ASCII
2Char
6bytes
R
0005
40006
R
0006
40007
Type
Value
Bit
Multi
Scale
16-Bit
Bit
(0-15)
R/W
000D
40008-40013
40014
Bit
(0-15)
R/W
000E
40015
Value
8-Bit
R/W
000F
40016
Bit
(0-7)
R/W
0010
40017
Bit
(0-7)
R/W
0011
40018
Value
8-Bit
R/W
0012
40019
Bit
(0-7)
R/W
0013
40020
Bit
(0-7)
R/W
0014
40021
Bit
Bit
(0)
(0)
W
R
0016
0017
40022
40023
40024
Value
8-Bit
R/W
0018
40025
Value
8-Bit
R/W
0019
40026
Value
8-Bit
R
0020
40027-40032
40033
R
0021
40034
Decimal
Value
8-Bit
R
0022
40035
Value
8-Bit
R
0023
40036
Table 11: Command Register Locations
40
S4000T
Parameter
Function
Type
Scale
Access
No. of
Register
Errors
RXD CRC Hi
Errors
RXD CRC
Low Errors
Not Used
Total # of Register Errors
Value
8-Bit
Total # of RXD CRC Hi Errors
Value
Total # of RXD CRC Low
Errors
N/A
Value
Clear All Comm Errors
Bit
Clear Comm
Errors
R
Register
Address
0024
Master I/O
Address
40037
8-Bit
R
0025
40038
8-Bit
R
0026
40039
40040-40045
W
0027 002C
002D
(0)
40046
Table 12: Command Register Locations, Cont.
8.8 S4000T Command Register Details
8.8.1 Analog
A read returns a value, which is proportional to the 0-20mA output current. The current is based
on a 16-bit value. The scaling is 0 - 65535 decimal which corresponds to 0 - 21.7mA.
8.8.2 Mode
A read returns the present mode of the S4000T. A write command changes the mode to the
requested mode.
Exception: Returns an Exception Code 01 (illegal function) if an illegal write is requested.
A calibrate command returns an Exception Code 01 (Acknowledge 05). The operation will take
a long time to complete.
Function
Calibration Complete
Spanning
Zero Complete, Waiting for Gas
Zeroing
Calibration Mode
Calibration Check Mode
Run Mode
Startup Mode
Bit Position
7 MSB
6
5
4
3
2
1
0 LSB
41
Access
Read
Read
Read
Read
Read/Write
Read/Write
Read
Read
S4000T
8.8.3 Status/Error
A read returns the Alarm state and Errors that are occurring at the present time, which are
indicated, by bit position.
Function
Alarm
Warn
Fault
Not Used
Not Used
Not Used
Not Used
Switch Error
Setup Error
Calibration Check Timeout
EEPROM Error
EPROM Error
Sensor Error
Fail to Calibrate
Low Supply Voltage
Bit Position
15 MSB
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Access
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
8.8.4 Unit Type
A read returns the Decimal Value 4000. This identifies the S4000C.
A read returns the Decimal Value 4001. This identifies the S4000T.
8.8.5 Software Revision
A read returns the software revision of the S4000T in 2 ASCII characters.
8.8.6 Status Block
A read returns a 6-byte message containing the analog (2 bytes), Mode (1 byte), Status/Error
(2 bytes), and Sensor Life (1 byte) in that order. For the format of each byte, refer to the
appropriate individual commands.
8.8.7 Alarm Settings
A read returns the present Alarm settings of the S4000T. A write command changes the
settings to the requested values. The set points are programmable in 5% FS steps (1% FS
steps for 20ppm range).
A 1 in the 9th bit position means the output is latching, a 0 means it is Non-Latching. A 1 in the
8th bit position means the output is normally energized a 0 means it is normally De-Energized.
The Alarm set point cannot be set below the Warn set point. Factory default is: 60% FS,
latching, de-energized.
Exception: Returns an Exception Code 01 (illegal function) if an illegal write is requested.
42
S4000T
Byte
High
Low
Function
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Latching/Non-Latching
Energized/De-Energized
Set point
Bit Position
15 MSB
14
13
12
11
10
9
8
(7-0)
Access
Read
Read
Read
Read
Read
Read
R/W
R/W
R/W
8.8.8 Warn Settings
A read returns the present Warn settings of the S4000T. A write command changes the
settings to the requested values. The set points are programmable in 5% FS steps (1% FS
steps for 20ppm range).
A 1 in the 9th bit position means the output is latching, a 0 means it is Non-Latching. A 1 in the
8th bit position means the output is normally energized a 0 means it is normally De-Energized.
The Warn set point cannot be set above the Alarm set point. Factory default is: 30% FS, nonlatching, de-energized. The maximum allowable set point is 50ppm.
Exception: Returns an Exception Code 01 (illegal function) if an illegal write is requested.
Byte
High
Low
Function
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Latching/Non-Latching
Energized/De-Energized
Set point
Bit Position
15 MSB
14
13
12
11
10
9
8
(7-0)
Access
Read
Read
Read
Read
Read
Read
R/W
R/W
R/W
8.8.9 Com1 Address
A read command returns the current address for Com1. A write command changes the address
to the requested value. Valid addresses are 1-247 decimal. Factory default is 1.
Exception: If the address is not in range an Illegal data value (03) is returned.
8.8.10 Com1 Baud Rate
A read command returns the current baud rate for Com1. A write command changes the baud
rate to the requested values. Valid settings are shown in the table below. Factory default is
19,200.
Baud Rate
Value
Access
2400
24
Read/Write
4800
48
Read/Write
9600
96
Read/Write
19,200
192
Read/Write
Table 13: Com1 Baud Rate
Exception: If the baud rate is not in range, an illegal data value (03) is returned.
43
S4000T
8.8.11 Com1 Data Format
A read command returns the current data format for Com1. Write command changes the data
format to the requested values. Valid settings are shown in the table below. Default format is
8-N-1.
Data
8
8
8
8
Parity
None
Even
Odd
None
Stop
1
1
1
2
Format
8-N-1
8-E-1
8-O-1
8-N-2
Data(Bits 9-8)
0
1
2
3
Access
Read/Write
Read/Write
Read/Write
Read/Write
Table 14: Com1 Data Format
Exception: If the data format is not in range, an illegal data value (03) is returned.
8.8.12 Com2 Address
A read command returns the current address for Com2. A write command changes the address
to the requested values. Valid addresses are 1-247 decimal. Factory default is 2.
Exception: If the address is not in range an Illegal data value (03) is returned.
8.8.13 Com2 Baud Rate
A read command returns the current baud rate for Com2. A write command changes the baud
rate to the requested values. Valid settings are shown in the table below. Factory default is
19,200.
Baud Rate
2400
4800
9600
19,200
Value
24
48
96
192
Access
Read/Write
Read/Write
Read/Write
Read/Write
Table 15: Com2 Baud Rate
Exception: If the baud rate is not in range an illegal data value (03) is returned.
8.8.14 Com2 Data Format
A read command returns the current data format for Com2. Write command changes the data
format to the requested values. Valid settings are shown in the table below. Factory default is
8-N-1.
Data
8
8
8
8
Parity
None
Even
Odd
None
Stop
1
1
1
2
Format
8-N-1
8-E-1
8-O-1
8-N-2
Data(Bits 9-8)
0
1
2
3
Access
Read/Write
Read/Write
Read/Write
Read/Write
Table 16: Com2 Data Format
Exception: If the data format is not in range an illegal data value (03) is returned.
44
S4000T
8.8.15 Reset Alarms
A write to this register with a data value of 1 will reset any latched alarms provided the current
gas level is below the alarm set point.
8.8.16 Sensor Life
A read returns the current estimate of remaining sensor life in percentage.
8.8.17 Sensor Scale
A read returns the current H2S sensor scale selected: 0-20ppm, 0-50ppm, 0-100ppm. A write
changes the scale to the desired scale. If the scale is changed, a calibration fault is generated,
forcing the operator to calibrate the unit.
H2S Sensor Scale
0-20 ppm
0-50 ppm
0 –100 ppm
Value (decimal)
20
50
100
Table 17: Sensor Scale
8.8.18 HazardWatch (Co – Calibration Output)
A read to this register will return the status of the HazardWatch Option.
0x01 enables this option, 0x00 disables this option, similar to the write.
NOTE: Only Com1 can support read/write to this register.
8.8.19 Total Receive Errors
A read indicates the total MODBUS Comm Receive Errors that occurred in the slave device.
The maximum count is 255 and then the counter will rollover to zero and begin counting again.
The total errors are an accumulation of the individual communication errors listed below:
8.8.20 Bus Activity Rate %
A read indicates the Bus Activity Rate in percent of this Slave’s addressed node versus other
addressed nodes. Range of this value is in hex (0-64) which translates to decimal (0-100%).
8.8.21 Function Code Errors
A read indicates the number of Function Code Errors that occurred in the slave device. The
maximum count is 255 and then the counter will rollover to zero and begin counting again.
8.8.22 Starting Address Errors
The counter is incremented for each address that does not equal the device address.
A read indicates the number of Starting Address Errors that occurred in the slave device. The
maximum count is 255 and then the counter will rollover to zero and begin counting again.
45
S4000T
8.8.23 Number of Register Errors
A read indicates the Number of Register Errors that occurred in the slave device. The
maximum count is 255 and then the counter will rollover to zero and begin counting again.
8.8.24 RXD CRC Hi Errors
A read indicates the number of RXD CRC Hi Byte Errors that occurred in the slave device. The
maximum count is 255 and then the counter will rollover to zero and begin counting again.
8.8.25 RXD CRC Low Errors
A read indicates the number of RXD CRC Low Byte Errors that occurred in the slave device.
The maximum count is 255 and then the counter will rollover to zero and begin counting again.
8.8.26 Clear Comm Errors
A Read or Write resets all the MODBUS Comm Error counters to zero.
46
S4000T
9.0 Appendix
9.1 Warranty
General Monitors warrants the Model S4000T to be free from defects in workmanship or
material under normal use and service within two years from the date of shipment.
General Monitors will repair or replace without charge any such equipment found to be
defective during the warranty period. Full determination of the nature of, and responsibility for,
defective or damaged equipment will be made by General Monitors’ personnel.
Defective or damaged equipment must be shipped to the General Monitors’ plant or
representative from which the original shipment was made. In all cases this warranty is limited
to the cost of the equipment supplied by General Monitors. The customer will assume all
liability for the misuse of this equipment by its employees or other personnel.
All warranties are contingent upon proper use in the application for which the product was
intended and does not cover products which have been modified or repaired without General
Monitors’ approval, or which have been subjected to neglect, accident, improper installation or
application, or on which the original identification marks have been removed or altered.
Except for the express warranty stated above, General Monitors disclaims all warranties with
regard to the products sold, including all implied warranties of merchantability and fitness and
the express warranties stated herein are in lieu of all obligations or liabilities on the part of
General Monitors for damages including, but not limited to, consequential damages arising out
of, or in connection with, the performance of the product.
9.2 Principle of Operation
General Monitors uses a proprietary Metal Oxide Semiconductor (MOS) film on the sensor for
detecting Hydrogen Sulfide (H2S) gas. The MOS film is deposited onto a substrate between two
electrodes. With no gas present, the measured resistance between these two electrodes is very
high (in the mega-ohms). As H2S adsorbs onto the film, the resistance between the two
electrodes decreases (to kilo-ohms). This decrease in resistance is logarithmically proportional
to the concentration of H2S that is present.
The change in resistance is converted to a change in voltage, and amplified by the input circuit.
This amplified signal is fed to an Analog to Digital (A/D) Converter, converted to a digital signal
and sent to the microprocessor to be processed. The process of H2S adsorbing onto the MOS
film is most effective at an elevated temperature. On the outer edge of the substrate is a heater
ring. The temperature of this heater ring is measured with a thermistor, and kept constant by a
circuit located inside the body of the sensor.
As H2S adsorbs onto the film, electrons move more freely from one electrode to the other. This
is represented as a decrease in resistance. The process of H2S adsorbing onto the MOS film is
completely reversible. As the concentration of H2S decreases (H2S desorbs), the resistance
between the electrodes will increase.
47
S4000T
9.3 Specifications
9.3.1 System Specifications
Sensor Type:
Sensor Life:
Repeatability:
Response Time:
Measuring Ranges:
Modes:
Electrical Classification:
Warranty:
Continuous
diffusion,
adsorption
type
Metal
Oxide
Semiconductor (MOS)
3 to 5 years typical
+2 ppm or 10% of the applied gas, whichever is greater
T50<1 minute (screen)
T50<2 minutes (sintered) with full scale gas applied
0-20 ppm, 0-50 ppm, 0-100 ppm
Calibration, gas check, setup
CSA/FM: Class I, Division 1, Groups B, C, D and Class I, Zone 1,
Ex d IIB+H2, T6.
ATEX: EEx d IIB T6 (Tamb=-40°C to +40°C)
Two years
9.3.2 Mechanical Specifications
Length:
Height:
Width:
Weight:
Mounting Holes:
6.4 inches (161mm)
3.4 inches (86mm)
4.1 inches (104mm)
5.5 lbs. (2.5 kg)
5.0 inches (127mm) (center to center)
9.3.3 Electrical Specifications
Input Power:
Power Consumption
24 VDC nominal, 20 to 36 VDC, 350mA max.
Start-up 270mA, Normal Operation 120mA
Relay Ratings:
8A @ 250 VAC/8A @ 30 VDC resistive max.
(3x) SPDT - Warning, Alarm & Fault
Analog Signal:
0-20mA (650 ohms max. load)
Malfunction
0mA
Gas Check
1.5mA
Setup mode
1.5mA
Calibration
1.5mA
Zero reading
4mA±0.2mA
0-100% scale 4-20mA
Over-range
20-22mA
Three-digit digital display with gas concentration, Warn and Alarm
LED’s, calibration prompts, fault codes, and setup options
Dual Redundant MODBUS RTU, suitable for linking up to 128
units or up to 247 units with repeaters
2400, 4800, 9600, or 19200 BPS
Open AO, calibration error, sensor heater error, low DC supply,
EEPROM, EPROM, setup error, gas check time exceeded, switch
error.
Complies with EN50081-2, EN50082-2
Status Indicators:
RS-485 Output:
Baud Rate:
Faults Monitored:
RFI/EMI Protection:
48
S4000T
Cable Requirements: 3-wire shielded cable. Max. distance between S4000T and power
source @ 24 VDC nominal
AWG
14
16
18
20
FEET
3430
1550
1050
650
METERS
1040
410
320
200
Table 18: 24VDC Cable Lengths
Max. distance for analog output (650 ohms max):
AWG
14
16
18
20
FEET
9000
5200
3800
2400
METERS
2740
1585
1160
730
Table 19: Analog Output Cable Lengths
Max. distance between the transmitter and sensor with one way resistance of 10 ohms (20Ohm loop):
AWG
14
16
18
20
FEET
3700
2400
1500
1000
METERS
1125
730
460
300
Table 20: Sensor Cable Lengths
European Union (EU) Approved Applications: PSU noise and ripple voltage 1.0Vpp max. The
customer supplied PSU must comply with IEC 1010-1, limiting current to 8A under Fault
conditions, in order to comply with CE Marking requirements.
9.3.4 Environmental Specifications
Operating Temperature Range
CSA/FM:
Electronics
Standard Sensor
High Temp Sensor
ATEX:
Electronics (T6)
-40°F to 167°F (-40°C to 75°C)
-40°F to 167°F (-40°C to 75°C)
-40°F to 195°F (-40°C to 90°C)
-40°F to 104°F (-40°C to + 40°C)
Storage Temperature Range:
-58°F to 185°F (-50°C to +85°C)
Operating Humidity Range:
5% to 100% RH, non-condensing
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S4000T
9.4 Approvals
CSA, FM, ATEX, CE Marking, GOST permission to use
Compiles with ISA-92.0.01, Part 1-1998 performance requirements
9.5 Spare Parts and Accessories
To order spare parts and/or accessories, please contact the nearest General Monitors’
Representative or, General Monitors directly, and give the following information:
•
Part Number of Spare Part or Accessory
•
Description of Spare Part or Accessory
•
Quantity of Spare Part or Accessory
9.5.1 Sensors
50445-1
0 to 100ppm, Aluminum Body, Wire Screen Arrestor
50445-5
0 to 50ppm, Aluminum Body, Wire Screen Arrestor
50445-9
0 to 20ppm, Aluminum Body, Wire Screen Arrestor
50448-1HT
0 to 100ppm, Stainless Steel Body, Wire Screen Arrestor, High Temp
50448-5HT
0 to 50ppm, Stainless Steel Body, Wire Screen Arrestor, High Temp
50448-9HT
0 to 20ppm, Stainless Steel Body, Wire Screen Arrestor, High Temp
51457-1L
0 to 100ppm, Stainless Steel Body, Sintered Steel Arrestor
51457-5L
0 to 50ppm, Stainless Steel, Sintered Steel Arrestor
51457-9L
0 to 20ppm, Stainless Steel, Sintered Steel Arrestor
50460-1
Sensor Simulator
9.5.2 Sensor Housing
10252-1
Universal Housing
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S4000T
9.5.3 Sensor Accessories
10041-1
Duct Mounting Plate
10044-1
Dust Guard Kit - 1 Guard, 12 Replaceable Screens
10042-1
Replaceable Screens, Box of 12
10395-1
Splash Guard Assembly
10110-1
Dust Guard Assembly
1800822
Dust Guard, Sintered SST
10066
Sensor Flow Chamber
9.5.4 Calibration Equipment
50000
Breaker Bottle, Single
50004-3
Individual Ampoules, 10 ppm (12 minimum)
50004-21
Individual Ampoules, 25 ppm (12 minimum)
50004-13
Individual Ampoules, 50 ppm (12 minimum)
50008-9
12 Ampoules at 50ppm (0-100ppm scale)
50008-16
12 Ampoules at 25ppm (0-50ppm scale)
50008-10
12 Ampoules at 10ppm (0-20ppm scale)
50009-9
12 Ampoules at 50ppm, includes breaker bottle (0-100ppm scale)
50009-16
12 Ampoules at 25ppm, includes breaker bottle (0-50ppm scale)
50009-10
12 Ampoules at 10ppm, includes breaker bottle (0-20ppm scale)
1400250-1
10ppm H2S Portable Purge Calibration Assembly
1400250-3
25ppm H2S Portable Purge Calibration Assembly
1400250-5
50ppm H2S Portable Purge Calibration Assembly
1400255-1
10ppm H2S Replacement Cylinder
1400255-3
25ppm H2S Replacement Cylinder
1400255-5
50ppm H2S Replacement Cylinder
51
S4000T
Case for Portable Purge Assembly
922-016
Replacement Regulator (0.2 L/min)
Replacement Hose
960-345
Hose Clamp, 5/16”
960-346
Hose Clamp, ¼”
1400152-1
Calibration Cup
9.5.5 Intelligent Sensor (S4000T) Replacement Parts
31161-1
Control Board Electronics
31151-1
Output Board Electronics
31156-1
Display Board Electronics
31170-2
Enclosure Cover Assembly with Window
31195-2
Enclosure Base Assembly
30051-1
Explosion-Proof SPST Switch
30060-1
Calibration Magnet
Cover Assy., O-Ring
9.5.6 Recommended Spare Parts for One (1) Year
30060-1
Extra Calibration Magnet (Qty. 1)
52
S4000T
9.6 FMRC Approval
Factory Mutual Research Corporation
1151 Boston-Providence Turnpike
Norwood, Massachusetts 02062
Approval of the transmitter does not include or imply approval of apparatus, to which the
transmitter may be connected and which processes the electronic signal for the eventual end
use. In order to maintain FMRC approved system, the control instrument, to which the subject
instrument is connected, must also be FMRC approved.
The following sensors have been FMRC approved for use with the Model S4000T:
•
50445-1 Aluminum Body H2S Gas Specific MOS Sensor, 0 to 100 ppm
•
50445-5 Aluminum Body H2S Gas Specific MOS Sensor, 0 to 50 ppm
•
50445-9 Aluminum Body H2S Gas Specific MOS Sensor, 0 to 20 ppm
•
50448-1HT Stainless Steel Body H2S Gas Specific MOS Sensor, 0 to 100 ppm
•
50448-5HT Stainless Steel Body H2S Gas Specific MOS Sensor, 0 to 50 ppm
•
50448-9HT Stainless Steel Body H2S Gas Specific MOS Sensor, 0 to 20 ppm
The following apparatus have been FMRC approved (although they have not been verified as
part of a Model S4000T system):
•
Model DT210 Eight-Channel Readout/Relay Display Module with Power Supply and
Relay Module
•
Model DT230 Dual-Channel Readout/Relay Display Module
53
S4000T
ADDENDUM
Product Disposal Considerations
This product may contain hazardous and/or toxic substances.
EU Member states shall dispose according to WEEE regulations. For further General Monitors’ product
WEEE disposal information please visit:
www.generalmonitors.com/customer_support/faq_general.html
All other countries or states: please dispose of in accordance with existing federal, state and local
environmental control regulations.
54