Vaisala GMW80 series CARBOCAP® carbon dioxide, humidity, and temperature transmitters are wall-mount transmitters designed to fulfill the needs for CO2 measurements in standard demand controlled ventilation applications.
The GMW80 series transmitter models include analog output transmitters with 4 … 20 mA current and/or 0 … 10 V voltage output, and the GMW87 transmitter with Modbus RTU support.
|
Model name |
CO2 output |
T output |
RH output |
Display 1 |
CO2 LEDs |
Relay |
CO2 range (ppm) |
|---|---|---|---|---|---|---|---|
|
GMW83 |
0 … 10 V |
0 … 10 V |
— | — | — | — |
0 … 2000 |
|
GMW83A |
0 … 10 V |
0 … 10 V |
— | — | — | — |
0 … 2000 |
|
GMW83D |
0 … 10 V |
0 … 10 V |
— |
|
|
— |
0 … 2000 |
|
GMW83RP |
0 … 10 V |
0 … 10 V Pt1000 (passive) |
0 ... 10 V |
— | — | — |
0 … 2000 |
|
GMW83DRP |
0 … 10 V |
0 … 10 V Pt1000 (passive) |
0 ... 10 V |
|
— | — |
0 … 2000 |
|
GMW84 |
4 ... 20 mA |
4 ... 20 mA |
— | — | — | — |
0 … 2000 |
|
GMW84S |
4 ... 20 mA |
4 ... 20 mA |
— | — | — |
|
0 … 2000 |
|
GMW86P |
4 ... 20 mA 0 ... 10 V |
Pt1000 (passive) |
— | — | — | — |
0 … 2000 |
| GMW87 | RS-485 Modbus RTU output | — | — | — | — | — | 0 … 5000 |
| GMW88 |
4 ... 20 mA 0 ... 10 V |
— | — | — | — | — | 0 … 2000 / 0 … 5000 2 |
Letters at the end of the model name stand for the following features:
- P
- Passive temperature measurement
- D
- Display
- A
- CO2 indicator LEDs
- R
- Humidity measurement
- S
- Relay
The CO2 measurement is based on the Vaisala proprietary CARBOCAP® sensor, which uses a novel, silicon-based microchip emitter instead of an incandescent light bulb. The internal reference in the CO2 sensor guarantees the best stability and operation also in constantly occupied buildings without frequent readjustments.
CARBOCAP® sensors give correct CO2 measurements immediately when powered on. As they have a built-in reference measurement, they do not need a lengthy learning phase before the measured values are correct. Proper operation can be verified immediately after snapping on the device cover.
All GMW80 series transmitters measure carbon dioxide (CO2) and temperature (T) with the exception of GMW87 and GMW88, which measure only CO2. Certain models also include relative humidity (RH) measurement. Humidity measurement utilizes the Vaisala INTERCAP® sensor.
For measurements in more demanding conditions (for example, dusty or humid installation locations), the GMW87 and GMW88 models provide an IP64-rated enclosure with a cable gland. The GMW87 model can be accessed with the Modbus RTU protocol over an RS-485 interface. The communication settings for the protocol are entered with DIP switches on the GMW87 component board.