Teledyne 3010PA Operating Instructions Manual page 27

3 Installation
Digital Remote Cal Inputs: Accept 0 V (off) or 24 V dc (on) inputs
for remote control of calibration. (See Remote Calibration Protocol below.)
Zero: Floating input. 5 to 24 V input across the + and – terminals
puts the analyzer into the Zero mode. Either side may be
grounded at the source of the signal. Signal must be removed
before zeroing is complete, or the zeroing will repeat. The
Analysis Unit internal valves operate synchronously to
supply the zero gas. See Remote Probe Connector at end of
section 3.3.
Span: Floating input. 5 to 24 V input across the + and – terminals
puts the analyzer into the Span mode. Either side may be
grounded at the source of the signal. Signal must be removed
before spanning is complete, or the spanning will repeat. The
Analysis Unit internal valves operate synchronously to
supply the span gas. See Remote Probe Connector at end of
section 3.3.
Cal Contact: This relay contact is closed while analyzer is spanning
and/or zeroing. (See Remote Calibration Protocol below.)
Remote Calibration Protocol: To properly time the Digital Remote
Cal Inputs to the Model 3010 Analyzer, the customer's controller must
monitor the Cal Relay Contact.
When the contact is OPEN, the analyzer is analyzing, the Remote Cal
Inputs are being polled, and a zero or span command can be sent.
When the contact is CLOSED, the analyzer is already calibrating. It
will ignore your request to calibrate, and it will not remember that request.
Once a zero or span command is sent, and acknowledged (contact
closes), release it. If the command is continued until after the zero or span is
complete, the calibration will repeat and the Cal Relay Contact (CRC) will
close again.
For example:
1) Test the CRC. When the CRC is open, Send a zero command
until the CRC closes (The CRC will quickly close.)
2) When the CRC closes, remove the zero command.
3) When CRC opens again, send a span command until the CRC
closes. (The CRC will quickly close.)
4) When the CRC closes, remove the span command.
3-6: Part I
Model 3010
PA