Online Single 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 gas detector system consists of a compact electronic module housed in a Weatherproof or explosion proof Metallic or Polyester box with an application specific sensor. 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

Our brand name ‘VASTHI’ had proven its credibility & reliability in Process Industry,by delivering zero flaw devices. VASTHI make measuring & safety instruments are installed at thermal power plants, petrochemicals, Fertilizer, cement, refineries, Steel and other process industries.


Computer interface:  RS-232

Data Logger:  1 Megabyte Non-Volatile Memory Control unit Specifications



Specifications for 2 wire transmitters:

  • Detection Principle Application Base
  • Response Time• 5 seconds
  • Zero drift 0.2%  Full Scale
  • Accuracy 1% Full Scale
  • Operating vo 20-30 vlot DC
  • Operation Temperature 0-5 C
  • Terminations PCB mounted terminal blocks
  • Display inbuilt 0.5″ LCD (Optional)
  • Output 4 – 2m mA Linear
  • Load Impedance 650 Ohms
  • Degree of Protection IP -65 explosions 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 block


Technical specifications:

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