Teledyne 3000TA-EU - General purpose trace oxygen analyzer - Manual (Page 37)

Trace Oxygen Analyzer Installation
Teledyne Analytical Instruments
25
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.)
Table 3-3: Remote Calibration Connections
Pin Function
9
+ Remote Zero
11 – Remote Zero
10 + Remote Span
12 – Remote Span
40 Cal Contact
41 Cal Contact
Remote Calibration Protocol: To properly time the Digital
Remote Cal Inputs to the Model 3000TA 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.