Transmitters for air quality monitoring - inputs for CO2, RH and temperature

The GD47AC transmitter is a self contained air quality monitoring transmitter. It is ideal for post occupancy studies in both domestic and institutional new-builds and refurbishment studies.


  • Built in digital RH, temperature and CO2 (0-5000ppm) sensors, ensuring fast and accurate measurement and requiring no analogue adjustment.
  • Calibration values are stored in the transmitter and the CO2 sensor includes a daily auto calibration feature.
  • Transmitter is powered from an external 12VDC supply (type MP12U) and is equipped with built-in rechargeable batteries to sustain operation for up to 100 hours in the event of AC mains supply interruption.
  • Availability of the external supply is continuously monitored and can be presented as a channel of data. This means an AC power failure can be investigated or alarmed before the internal batteries become discharged.



  • Sensor functionality identical to the GD47AC.
  • Battery-powered for deployment in areas where a mains AC connection is not available
  • CO2 is measured every 5 minutes independent of the transmission interval. This technique is used to significantly reduce battery consumption.
  • To extend battery performance, the EL47Batt battery pack can be used.

LM47B Logmitter

The GenII Logmitter is a series of devices from Eltek that can be configured as a GenII transmitter or standalone datalogger.

Configured as a logger and deployed alone, it is ideal for smaller spaces and short term or temporary events in sites such as galleries or laboratories. For large buildings, e.g. city block museums, storage areas or research laboratories, it can be deployed as a transmitter alongside other GenII transmitters.




AQ110A is an advanced air quality transmitter that can be used alongside the existing family of GenII transmitters. It enables detailed monitoring of a site such as a school, hospital, office, gallery, or work area - anywhere that air pollution can affect the health of the occupants or the objects and processes within.


AQ112 has all of the functionality of the AQ110A, with the addition of an ozone (O3) sensor.




WBG Wall bracket docking kit

This kit enables fitment of the transmitter's built-in wall bracket to difficult or uneven surfaces. The kit provides additional docking security.

The following products are supported:

  • All GD, GC, GL and GS series transmitters
  • RP250GD repeater and RC250 receiver


Transmitter Specification

Model(s) Sensors Range Resolution Accuracy
GD47AC / GD47B / LM47B Temperature -30 to 65°C 0.1°C ±0.4°C (+5 to +40°C)
±1.0°C (-20 to +65°C)
±1.5°C (-30 to -20°C)
RH 0-100% 0.1% ±2% (10 to 90%RH)
±4% (0 to 100%RH)
CO2 0-5000ppm 3% ±50ppm

Common GenII Transmitter Specification

RF specification: EN300-220
RF power: 10mW
Environment specification  
  Compliant to EN300-220: -10 to +55°C
  Actual: -30 to +65°C
  Humidity: 100% non condensing
Environmental rating: IP40
Dimensions (footprint): 78 x 41mm
Transmission interval range: 1 sec to 4 hours
Indicator (red LED): transmit active/on/off
Control switch (concealed): test mode / hibernate
Antenna socket: SMA


Common to all transmitters

Gen II Quick Start Instructions

Specific to this family of transmitters


Air quality transmitters datasheet
GenII Logmitter

User Instructions
User Instructions for AQ110A
User Instructions for AQ112