The GMP250 relay box allows using the analog current (mA) output channel of Vaisala CARBOCAP® Carbon Dioxide Probes GMP251 and GMP252 for relay control.
The voltage (V) output channel is not used for relay control with the relay box: the voltage channel provides CO2 measurement output (feedthrough via the relay box) in the same manner as when wired directly without the relay box.
The relay configuration (activation and release limits, error state output) is done using GMP251/252 serial line interface commands.
Property | Specification |
---|---|
Maximum switching voltage | 50 VDC, 50 VAC |
Maximum switching power | 30 W, 30 VA |
Number of relays | 1 |
Probe output to relay |
|
Probe power supply requirements | 20 ... 30 VDC supplied through the relay box |
Relay configuration interface | Serial line (Vaisala Industrial Protocol) |
Using GMP251/252 for relay control requires
using the Vaisala Industrial Protocol serial line interface to configure the probe to use
relays, and wiring the probe to send output and receive power through the relay box.
- For instructions on carrying out the serial line configuration, see Serial Line Configuration.
- For wiring instructions, see Probe and Relay Box Wiring .
This Quick Guide instructs
how to carry out the serial line configuration and wiring related to using the current
output for relay control. For more information on GMP251/252 serial line commands and other
functionalities, see the user documentation of the probes:
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