Toxic Gas Transmitter TGT 1550 3 Wire



  • 12-bit microprocessor
  • Built-in Watchdog
  • 4-20 mA proportional output
  • Weather-proof Enclosure IP65
  • Operating over wide voltage 10-30 V dc
  • Sensor c/w configured and pre-calibrated Transmitter

 Special Features

  • Serial output to facilitate PC based Calibration & data download
  • Lot /Serial number and Calibration date stored in the memory
  • End-of-life Alarm
  • Digital Filter – Averaging of Sampled values
  • Pilot Indication through local LED


DU 1550 is a 12 bit microprocessor based design. The raw signal input from the sensor is processed digitally by the microprocessor, which also stores information such as calibration data, the range and lifetime of the sensor. The device is configured to deliver the measured gas concentration data as linear analogue output.

DU 1550 can also be interrogated digitally from PC via serial interface, with information such as alarm thresholds, fault conditions, calibration information, etc. being available from the microprocessor’s registries. This DU can be provided with upto 3 alarms and relays for external control.

Technical specifications :


Sensor Electrochemical, Catalytic Comb., Infra-red
Type Diffusion, Suction ( optional)
Signal output 4-20 mA proportional output
Visual Indication Pilot LED, 3 digit LED display ( optional)
Power supply 12V or 24 V or Universal AC 100-260 V AC
Signal Outputs 3 wire 4-20 mA, RS485 COM port
Control Outputs Upto 3 Relays, 2Amp., 230 V AC
Current consumption <100 mA @ 12 V DC<70 mA @ 24V DC
Microprocessor 12-Bit
Auto Zero routine Zero drift compensation
Digital Filter Sampled values variable average
Warm-Up time Max. 5 minutes
Stabilization time Less than 2 minutes
Operating Temperature -10 ºC to +50 ºC
Storage Temperature -25ºC to +60 ºC
Relative Humidity 20-90 % RH, Non condensing
Pressure 90-110 KPa
Air Velocity < 0.1- 0.5 m/s
Calibration Digitally, Via RS485 Interface or with optional portable calibration unit
Dimensions (H x L x D)mm [158 x 82(+28mm with brackets)  x 85]mm
Weight Less than 350 gms
Mounting Wall/Floor  with Brackets/Stand
Enclosure Weatherproof IP65
Enclosure Material ABS or Cast Al alloy LM6
Sensor Housing PVC,SS (Optional)
Connections 3 Screw terminal (Wire dia 0.2-2.5 mmsq)

Gas and Range

CO   =  0-500ppm,  H2S  = 0-100ppm, NH3 = 0-100/1000 ppm, NO2 = 0-20 ppm,

O2    = 0 -25%, NO = 0-100 ppm, Cl2 = 0-20 ppm, SO2 = 0-50 ppm


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