I'd like to connect a Vaisala GMP222 CO2 probe to a CR1000 data logger. I'm a novice with CS loggers but keen to learn!
I dont have the user guide for the probe but think the wiring for the sensor is:
Pin Colour Analog signal RS-232C
1 White TX
2 Brown TX
3 Green RX
4 Yellow Signal + -
5 Grey Supply Gnd Supply Gnd
6 Pink +11-36V DC +11-36V DC
7 Blue RX
8 Shield Signal Gnd -
I understand I can use a single ended voltage measurement (pin 4 to H, pin 5 to Gnd, pin 8 Gnd). With this wiring I get a voltage measure from this but dont know how to convert it to CO2 ppm.
Can anyone reccommend a better approach?