Vaisala GMW80 HVAC Transmitters

Vaisala GMW80 series is a range of carbon dioxide (CO2), relative humidity and temperature transmitters designed specifically for the HVAC and building control industry. These low cost, yet reliable instruments are suitable for ventilation control even in building with 24/7 occupancy. Common installs include, schools, colleges & universities, shopping centres, office blocks and gyms. Vaisala GMW80 HVAC transmitters offer a simple and clean installation where cabling is easily hidden from view. 4-20mA and 0-10v analogue outputs allow various options for your BMS system. Alternatively, consider the Vaisala GMW90 HVAC CO2 & Temperature Transmitters for BACNet / Modbus communication protocols.

As of 2018, Government issued bulletin BB 101 (Ventilation, thermal comfort and indoor air quality) specifically provides guidance on ventilation, thermal comfort and indoor air quality in schools. A full copy of the document can be downloaded HERE, specific points however include:

Daily average concentration of carbon dioxide (CO2) of less than 1000 ppm, during the occupied period
Maximum concentration should also not exceed 1500 ppm for more than 20 consecutive minutes each day when the number of room occupants is equal to, or less than the design occupancy

(The above points are where mechanical ventilation is used, with allowable levels currently 500ppm higher for natural ventilated areas. Please consult latest government guidelines and the full details given within these guidelines. We highlight these points as guidance only).

Vaisala GMW80 HVAC transmitters offer 0…2,000ppm and 0…5,000ppm versions to accurately and reliably control ventilation within these parameters.

Vaisala GMW80 HVAC Transmitter specific model types

GMW86P: 0…2000ppm CO2 only with current and voltage output (inbuilt Pt1000 temperature sensor)
GMW86PK5: As GMW86P, except 0…5000ppm measurement range
GMW83RP: CO2+RH with Voltage only outputs (inbuilt Pt1000 temperature sensor)
GMW83DRP: As GMW83RP with display
GMW83: CO2+Temperature with voltage outputs
GMW83A: as GMW83 with additional CO2 indicator LEDs
GMW83D As GMW83 with display
GMW84: CO2+Temperature with current output for CO2
GMW84S: as GMW84 with relay contact
GMW88: As GMW86P but with splash cover for greenhouse applications
GMW88K5: as GMW86P but with splash cover for greenhouse applications

Vaisala GMW80 HVAC Transmitter Specifications

Simple install with hidden cables and clean, elegant aesthetics
18…35Vdc or 24Vac (±20%, 50/60Hz) supply
Relay options have a SPST (normally open) contact, max 50Vac/dc, 500mA
Typical uncertainty within ±[30ppm +3% reading)] in normal ambient conditions
Stability within approx ±[15ppm +2% reading] over 5 years
Suitable for indoor, dry environments. Plastic enclosure, IP30
Suitable for use within 0…50°C
RH uncertainty within ±3% (0…80%RH), measurement range <95%
With proven CARBOCAP and INTERCAP Vaisala sensor technology
Replaceable GM10 spare part CO2 sensor module and optional 18V power supply plug available

Video: Installation of Vaisala GMW80 Series CO2, RH&T transmitters

Fluidic are a recognised partner of Vaisala CEN (Industrial division) for Scotland and the North of England. Our instrumentation engineers are product trained and able to help with instrument selection within the full range of Vaisala relative humidity and dewpoint transmitters. Please call either office for more information (Glasgow 0141 641 5920, Warrington 01925 572401).