General Monitors S4000TH H2S Gas Detector

Code: S4000TH-1-0-13-3
  • H2S gas detection ranges (0-20 ppm, 0-50 ppm, 0-100 ppm)
  • Industry standard 4-20mA output for remote alarm & fault indication
  • Remaining sensor life indication reduces downtime

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The S4000TH is obsolete and has been replaced by the S5000 Gas Monitor.

The S4000TH Intelligent Sensor is a microprocessor-based transmitter designed for use with General Monitors’ Metal Oxide Semiconductor (MOS) sensor. This unit features one-person calibration and can virtually self-calibrate by simply activating a magnetic switch and applying gas. It is designed to detect hydrogen sulfide in parts per million (ppm) levels and provide status indication and alarm outputs.

All of the S4000TH electronics are contained within an explosion-proof housing, allowing sensor information to be processed at the sensor site. It provides a 4-20 mA signal that is proportional to 0-100% of the sensor’s detection range. In addition, the S4000TH includes warning, alarm, and fault relay contacts that can be used to indicate an alarm or fault condition, as well as dual redundant Modbus or HART communications. Configurations with relays, Modbus and HART are available to meet many needs.

The S4000TH includes a three (3) digit LED display. This local digital display continuously indicates gas concentrations during normal operation and in calibration check mode, as well as prompts during calibration mode, displays codes during setup mode, and eight fault codes. The S4000TH has four different operating modes.

First, the normal operating mode in which alarms are active and the display and 4-20 mA readings are proportional to the gas concentration at the sensor. Second, the gas check mode enables the user to apply gas and verify the sensor response while alarm outputs are inhibited. Third, a calibration mode in which gas is applied to the sensor to calibrate the unit. Finally, a setup mode is available that allows users to review and modify setup options, including relay settings, sensor range, and Modbus parameters. Selecting Setup Mode on the S4000TH is accomplished by using the magnetic switch, HART or Modbus command.

Features

  • Event logging stores fault, gas check, calibration, and alarm event history.
  • HART and Modbus communication provide complete status and control capability in the control room.
  • Warning, alarm & fault relays provide local alarm capability.
  • Calibration, calibration check, and setup mode simplify operation and maintenance.

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Title Size
S4000TH Datasheet 299 KB
S4000TH Configurator 92 KB

Additional information

Weight 0.190 kg

Specifications

System Specifications
Sensor Type Continuous diffusion, adsorption type Metal Oxide Semiconductor (MOS)
Sensor Life 3 to 5 years typical
Repeatability ±2 ppm or 10% of the applied gas, whichever is greater
Response Time T50 < 14 seconds (screen)
T50 < 30 seconds (sintered)
With full scale gas applied according to ISA 92.0.01
Measuring Ranges 0-20 ppm, 0-50 ppm, 0-100 ppm
Modes Calibration, calibration check, setup
Classification
CSA/FM Class I, Division 1, Groups B, C & D; T6
(Tamb = -40°C to +75°C)-CSA
(Tamb = -40°C to +60°C)-FM
CSA Ex db IIB + H2 T4 Gb (Tamb=-40°C to +70°C);
Ex tb IIIC T135°C Db
ATEX/IECEX II 2 GD Ex db IIB+H2, T4 Gb, Ex tb IIIC T135°C Db
(Tamb = -40°C to +70°C)
Warranty Two years
Approvals ATEX, CSA, FM, IECEx, EAC, CE Mark, HART registered, SIL 2 and 3 suitable*,
FM certiQed to IEC 61508
Environmental Specifications
Operating Temperature Range
(ELECTRONICS) -40°F to 167°F (-40°C to 75°C) – CSA (div.)
-40°F to 158°F (-40°C to +70°C) – CSA (zone)
-40°F to 140°F (-40°C to +60°C) – FM
-40°F to 158°F (-40°C to +70°C) – ATEX/IECEx
Storage Temperature Range -58°F to 185°F (-50°C to 85°C)
Operating Humidity Range 0% to 95% RH, non-condensing
Mechanical Specifications
Length 6.4 inches (161 mm)
Height 3.4 inches (86 mm)
Width 4.1 inches (104 mm)
Weight 5.5 lbs. (2.5 kg) – AL, 14.0 lbs. (6.4kg) – SS
Mounting Holes 5.0 inches (127 mm) (center to center)
Housing Aluminum 6061-T6 alloy (cover),
A356-T6 alloy (base) or 316 Stainless Steel
Electrical Specifications
Input Power 24 VDC nominal, 20 to 36 VDC
350 mA max.
Power Consumption 270 mA (start-up)
120 mA (normal)
Relay Ratings 8A @ 250 VAC / 8A @ 30 VDC res. max.
OPTIONAL (3x) SPDT – Warning, Alarm & Fault
Analog Signal 0-20 mA (650 Ohms max. load)
EMC Protection Complies with EN 50270, EN 61000-6-4
Status Indicators Three-digit LED display with gas concentration, Warn and Alarm LED’s, calibration prompts, fault codes, and setup options
RS8485 Output (Optional) Dual redundant Modbus RTU, suitable for linking up to 128 units or up to 247 units with
repeaters
Baud Rate 2400, 4800, 9600, or 19200 BPS
HART (Optional) RX 100K, CS 5nF
Faults Monitored Calibration error, sensor heater error, low DC supply, EEPROM, EPROM, setup error, gas check time exceeded, switch error, magnet errors
Cable Requirements 3 wire shielded cable. Max. distance between S4000TH and power source or remote sensor

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