Ametek Thermox CEM O2/TM, User Manual

Page: 48 / 168

3-26 | Thermox CEM O2/TM
Remote Calibration Unit Connections
If you don’t have the remote calibration unit (RCU) option, skip this sec-
tion.
Follow general grounding and shielding requirements for all wiring
as described in the “General Wiring Requirements” section at the
beginning of this Wiring section.
Remote Calibration Unit (RCU) connections on the Series 2000 control
unit wiring card, and their RCU connections, are as follows (see Figure
3-22):
ZERO - 13 on RCU
ASPIR - Process/Cal Control Valve Signal
SPAN1 - 15 on RCU
VALVE COMMON - 16 on RCU
Digital Input to Initiate Remote Calibration Unit
The digital input connections on the wiring card allow you to initiate a
remote calibration from a location other than the control unit (see Figure
3-23). For this option to work, you must have a remote calibration 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.
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 -