VOC, Temp & RH Transmitter (VOCT) 24V

VOC, Temp & RH Transmitter (VOCT) 24V

The Flamefast VOC (Volatile Organic Compounds), Temperature and Relative Humidity transmitter offers an accurate and cost-effective solution for the HVAC market, with 0-10V outputs for VOC, Temp and RH Levels (outputs depend on model selection). The VOCs are measured and displayed in CO2 equivalent for easy interpretation.

Using the built-in Volt Free Contact, the unit can be easily interfaced with Ventilation and Window Control Systems. The unit can also simply be used as a traffic light indication to raise awareness of VOC, Temp or RH levels.

The unit offers two user selectable programmes with different relay set points depending on the application. Custom software profiles are also available to control the relay set point and the traffic light changeover levels, based on any combination of VOCs, Temp & RH (VOC as default).


View FileVOC, Temp & RH Transmitter (VOCT) 24V

Key Features

  • 24V AC/DC Power Supply
  • Low power consumption
  • Pluggable terminal block for ease of installation
  • Optional digital readout
  • Optional traffic light indication
  • 3x 0-10V outputs (full-scale linear)
  • Volt free contact output
  • Typical 10 year life expectancy
  • Self-calibrating VOC sensor
  • Mounts onto any standard single gang junction box or conduit box

Technical Specification

Power Supply 24V AC/DC ±10%
Power Consumption 50mA Max
VOC Range (CO2 Equivalent) 400 - 2,000ppm
VOC Accuracy ±5% @ NTP
VOC Display Resolution 1ppm
VOC Sensor Type Semiconductor
Temp Range (0-10V) 0 - 50°C
Temp Accuracy ±0.3°C @ 20 - 40°C
Temp Display Resolution 0.1°C
RH Range (0-10V) 0 - 100%
RH Accuracy +/-2% @ 20 - 80%
RH Display Resolution 0.1%
VFC Output Rating SPST - 100mA @ 24V Max
Operating Conditions Temp 0°C to 50°C
Humidity 0 to 95% (NC)
Sampling Method Diffusion
Warm-up Time 30 seconds
IP Rating IP40
Housing Material Flame Retardant ABS
Approval CE


Height 125 mm
Width 86 mm
Depth 36 mm

Installer Selectable Options

  • Backlight (Enable/Disable)
  • Volt Free Contact set point
  • Display Options:
    • On standard Model - replace PPM reading with 'CO2'
    • On -H model - remove RH readout

The VOCT has four factory set user selectable programmes to control the Volt Free Contact and LCD Traffic Light behaviour.

These are as follows:

Program 1 2
Green - Yellow 1,000 1,000
Yellow - Red 1,500 1,500
Relay Position N/O N/O
Relay Set Point   1,000 1,500
CO2 Range 2,000 2,000

Custom programs available on request

Part Numbers & Options / Accessories

Part No Description
VOCT VOC Transmitter
VOCT-H VOC, Temp & RH Transmitter
-L Adds a Traffic Light LCD to any of the above

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