Teledyne 3000TA-XLEU - Trace oxygen analyzer - Manual (Page 43)

Trace Oxygen Analyzer Installation
Teledyne Analytical Instruments 27
40 Cal Contact
41 Cal Contact
3.3.2.2.5 Remote Calibration Protocol
To properly time the Digital Remote Cal Inputs to the Model
3000TA-XL-EU 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.
Note: The Remote Valve connections (described below) provides
signals to ensure that the zero and span gas valves will be
controlled synchronously. If you have the –C Internal valve
option—which includes additional zero and span gas
inputs—the 3000TA-XL-EU automatically regulates the
zero, span and sample gas flow.
3.3.2.2.6 Range ID Relays
Four dedicated Range ID relay contacts. The first three ranges are
assigned to relays in ascending order—Low range is assigned to Range