Teledyne manual Installation, Model 7300A, 9+ Remote Zero 11– Remote Zero 10+ Remote Span

2 Installation Model 7300A

Table 2-6: Remote Calibration Connections

Pin Function

9+ Remote Zero

11– Remote Zero

10+ Remote Span

12– Remote Span

40Cal Contact

41Cal Contact

Remote Calibration Protocol: To properly time the Digital Remote Cal Inputs to the Model 7300A 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 close quickly.)

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 close quickly.)

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 Probe connector provides signals to operate the zero and span gas valves synchronously. However, if you have the –C Internal valve option, which includes zero and span gas inputs, the 7300A automatically regulates the zero, span and sample gas flow.

2-8 Teledyne Analytical Instruments