Teledyne 3000PAEU - General purpose percent oxygen analyzer User Manual

Page 30

3 Installation

Model 3000PA

3-8

Teledyne Analytical Instruments

Table 3-3: Remote Calibration Connections

Pin

Function

+ Remote Zero

– Remote Zero

+ Remote Span

– Remote Span

Cal Contact

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.

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 3000P automatically regulates the zero, span and sample
gas flow.

Range ID Relays: Four dedicated Range ID relay contacts. The first

three ranges are assigned to relays in ascending order—Low range is as-