Simplicity 4040 Specifications download pdf (Page 32)

Installation Series 4040

32 Teledyne Analytical Instruments

3.3.3.6 DIGITAL REMOTE CAL INPUTS

The digital remote calibration input accepts 0 V (off) or 24 V dc (on)

for remote control of calibration. (See Remote Calibration Protocol

below.) See Table 3-5 for pin connections.

Span: Floating input. A 5–24 V input across the + and – pins puts the

analyzer into the Span mode. Either side may be grounded at the

source of the signal. A 0–1 volt across the terminals allows Span

mode to terminate when done. A synchronous signal must open

and close external span valve appropriately.

Cal Contact: This relay contact is closed while analyzer is spanning.

(See Remote Calibration Protocol below.)

Table 3-5: Remote Calibration Connections

Pin Function

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 4020 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 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 span command is sent, and acknowledged (contact closes),

release it. If the command is continued until after the span is complete,

the calibration will repeat and the Cal Relay Contact (CRC) will close

again.

For example:

Test the CRC. When the CRC is open, send a span command until the

CRC closes (The CRC will quickly close.)

When the CRC closes, remove the span command.

When CRC opens again, the span calibration is done, and the sample

is being analyzed.

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Simplicity 4040 Specifications Page 32