3-28 | Thermox TM 2000 Oxygen Analyzer
Remote Calibration Unit Connections
If you don’t have the remote calibration unit (RCU) option, skip this sec-
tion.
Remote Calibration Unit (RCU) wiring connections between the Series
2000 control unit wiring card and the RCU are as shown in Figure 3-24
and Figure 3-25.
Digital input to initiate remote calibration unit
The digital input connections on the wiring card allow you to initiate a re-
mote calibration or verification from a location other than the control unit
(see Figure 3-25). For this option to work, you must have a remote calibra-
tion unit and an auto calibration card. The system monitors the digital
input, and when the switch closes, it sends the system into an automatic
calibration or verification. The switch you connect to this digital input
must be a normally open switch.
Digital input connections are labeled as follows on the wiring card
DIGIN +
DIGIN -
Figure 3-24.
RCU connections table.
SERIES 2000 WIRING
CARD CONNECTIONS
DESCRIPTION WIRE COLOR RCU CONNECTION
Aspirator Sample Gas Red 15
Zero
Zero Calibration Gas Green 13
Span
Span Calibration Gas White 14
Valve Common
(2 pin location)
Solenoid Common
Wires
Black 17
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