Online Voc Monitor

Vasthi Instruments are global leaders in manufacturing of Online Voc Monitor and have been supplying instruments to customers worldwide, Our multidisciplinary team of scientists, physicians, engineers, and regulatory consultants with decades of global experience brings you the quintessential mechanism that provides complete safety accuracy and durability.

Vasthi Instruments was formed with visionary thinking and innovative ideas resulting in innovative products and solutions. We enhance our product quality by the continuous process of research and development. We have WIDE range of models to suite various site conditions and processes.
VOC monitor


VASTHI VOC 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. This state of the art transmitter is carefully designed with and manufactured with industrial grade Components for reliability accuracy and long life.

It is certified For use hazardous areas Class 1, Division 1, Group B, C & D. (llA, llB or llC) apart from being available in weatherproof Enclosure. Transmitters are equipped with micro controller and are heavily featured with self-diagnostics, Auto calibration through embedded Software, Can be done at site. RS232/485 output with baud rates of 2400 bps is available as an option.


  • Computer Interface: RS-232
  • Data Logger: 1 Megabyte, Non-Volatile Memory

Control unit Specifications

Model:  VOC-900-2)

specifications for 3 wire transmitters

  • Response Time < 30 seconds
  • Accuracy 2% Full Scale Operating
  • Voltage 7-30 Volt DC Operating
  • Temperature 0-55 C Terminations
  • PCB mounted terminal blocks
  • Display Warn & 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 & alarm
  • Contact rating 30 VDC/2A
  • Communication RS232/RS485 (Optional
  • Power Consumption 3.6 W max.


  • Sensor Principle: PID
  • Display : Digital
  • Response Time : <10 seconds at 95% variant
  • Working Temperature: -5 Deg.  C to 55 Deg.  C
  • Storage Temperature: – 20 Deg.  C to 45 Deg C
  • Temperature Range :  0 – 55Deg. C
  • Warranty     :  One year