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Percent Oxygen Analyzer Installation 3
3-7Teledyne Analytical Instruments
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. A 5 to 24 V pulse input across the + and –
terminals puts the analyzer into the
Zero
mode. Either side
may be grounded at the source of the signal. A synchronous
signal must open and close the external zero valve appropri-
ately. See 3.3.3 Remote Probe Connector. (The –C option
internal valves operate automatically.)
Span: Floating input. A 5 to 24 V pulse input across the + and –
terminals puts the analyzer into the
Span
mode. Either side
may be grounded at the source of the signal. A synchronous
signal must open and close external span valve appropriately.
See 3.3.3 Remote Probe Connector. (The –C option internal
valves operate automatically.)
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 3000PA 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.
When CRC opens again, zero and span are done, and the sample is
being analyzed.