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Installation
Digital Remote Cal Inputs: Accept 0 V (off) or 5-24 VDC (on)
inputs for remote control of calibration. (See Remote Calibration
Protocol below.) See Table 3-3 for pin connections.
Zero:
Floating input. 5 to 24 V input across the + and – pins put the
analyzer into the Zero mode. Either side may be grounded at
the source of the signal. 0 to 1 volt across the terminals allows
Zero mode to terminate when done. A synchronous signal must
open and close the external zero valve appropriately. See
Remote Probe Connector. (The –C option internal valves
operate automatically.)
Span:
Floating input. 5 to 24 V input across the + and – pins put the
analyzer into the Span mode. Either side may be grounded at the
source of the signal. 0 to 1 volt across the terminals allows Span
mode to terminate when done. A synchronous signal must open
and close external span valve appropriately. See Figure 3-4
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
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 2000RS 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
Teledyne Analytical Instruments
Function
2000RS
22
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