Quick Guide
www.vaisala.com
Vaisala CARBOCAP®
Carbon Dioxide Probe GMP251
Ref. M211798EN-D
© Vaisala 2016. All Rights Reserved.
Do not open the probe body.
Replacing the Filter
To open the lter, turn the lter counter-clockwise.
Re-install the lter to nger-tightness.
Be careful not to touch any parts under the lter!
Pinout and Dimensions
Pin # Function Note
Wire Colors,
Cable with
Open Wires
1 Power in With digital output: 12 … 30 VDC
With voltage output: 12 ... 30 VDC
With current output: 20 ... 30 VDC
Average consumption < 0.4 W, maximum 0.5 W
Brown
2 RS-485- or
voltage output
Voltage output:
0 ... 5 VDC or 0 ... 10 VDC*
White
3 GND
Blue
4 RS-485+ or
current output
Current output:
0 ... 20 mA or 4 ... 20 mA*
Black
5 Output control Connecting pin #5 to GND (pin #3) forces the probe to analog
output mode. If an analog output conguration has not been
selected, default 0...10 VDC and 4...20 mA scalings are used.
If pin #5 is not connected, the analog or digital output selected
when ordering or set later through conguration is used.
Gray
Vaisala Oyj
Vanha Nurmijärventie 21
FI-01670 Vantaa, Finland
1
5
34
2
*M211798EN*
M12 Connector
r
c
A
*
)
Default analog output scaling.
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1
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