Online Multi gas detector with Control unit

VASTHI Field gas Transmitters continuously monitors for dangerous concentrations of gases. The linearize 4-20 mA transmission can interface directly with any receiving instrument starting from indicators, controllers to large control systems. The standard system consists of a compact electronic module housed in a Weatherproof or explosion proof Metallic or Polyester box with an application specific sensor.

Multi gas detector with control unit


This gas detector state of the art transmitter is carefully designed with and manufactured with Industrial grade Components for reliability accuracy and long life. Gas detector is certified for use in hazardous areas Class 1, Division 1, Group B, C & D. (IIA, IIB or IIC) apart from being available in weatherproof Enclosure.

Transmitters are equipped with micro controller and are heavily featured with self-diagnostics, Auto calibration (in case of toxic, O2, combustible gases only) through embedded Software, can be done at site. RS 232/485 output with baud rates of 2400 bps is available as an option.


Additional Features:

  • Compute Interface: RS-232
  • Data Logger: 1 Megabyte, Non-Volatile Memory
  • Control unit Specifications


Specifications for 2 wire transmitters:

  • Detection Principle Application Based
  • Response Time • 5 seconds
  • Zero drift 0.2% full Scale
  • Accuracy 1% full Scale
  • Operating Voltage 20-30 Volt DC
  • Operating Temperature 0-50 C
  • Terminations PCB mounted terminal blocks
  • Display Inbuilt 0.5″ LCD Optional)
  • Output 4 – 20 mA Linear
  • Load Impedance 50 Ohms
  • Degree of Protection IP -65 explosion Proof

Specifications for 3 wire transmitters

  • Detection Principle Application Based,Response Time‹ 5 seconds
  • Zero drift 0.2% Full Scale,Accuracy 1% Full Scale Operating
  • Voltage 7-30 Volt DC Operating,Temperature 0-50 C Terminations
  • PCB mounted terminal blocks,Display Warn Et Alarm Status LED Indicator
  • Inbuilt 0.5″ LCD (Optional),Analog Output 4 – 20 mA Linear/ 0-1 V DC
  • Digital Output Two auxiliary contact for warn Et alarm,Contact rating 30 VDC/2A
  • Communication RS232/RS485 (Optional),Power Consumption 3.6 W max.
  •   Load impedance 350 – 650 Ohms (7V – 30V)

Technical specifications:

  • Sensor Principle: As per the required gas
  • Display: Digital
  • Response Time: <10seconds at 95% variant
  • Working Temperature: – 5 Deg.  C to 60 Deg.  C
  • Storage Temperature: -20 Deg.  C to 60 Deg.C
  • Warranty: One year