Trace Oxygen Analyzer
Installation
Teledyne
Analytical
Instruments
21
Zero: Floating input. 5 to 24 V input across the + and – pins puts 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 puts 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 3-5 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 Function
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 3000ZA 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.
