Digital Remote Cal Inputs - Teledyne 2010A Operating Instructions Manual

Thermal Conductivity Analyzer
Further detail can be found in chapter 4, section 4-5.

3.3.5 Digital Remote Cal Inputs

Accept 0 V (off) or 24 V dc (on) inputs for remote control of calibra-
tion. (See Remote Calibration Protocol below.)
Zero:
Span:
Cal Contact: This relay contact is closed while analyzer is spanning
and/or zeroing. (See Remote Calibration Protocol below.)
Remote Calibration Protocol: To properly time the Digital Remote
Cal Inputs to the Model 2010A 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.
(Reset by pressing I/o button to remove power. Then
press I/o again and any other button EXCEPT Sys-
tem to resume.
Figure 3-: Types of Relay Contacts
Floating input. 5 to 24 V input across the + and – terminals
puts the analyzer into the Zero mode. Either side may be
grounded at the source of the signal. A synchronous signal
must open and close the external gas control valves appro-
priately. See 3.3.9 Remote Probe Connector. (With the –C
option, the internal valves operate automatically.)
Floating input. 5 to 24 V input across the + and – terminals
puts the analyzer into the Span mode. Either side may be
grounded at the source of the signal. A synchronous signal
must open and close the external gas control valves appro-
priately. See 3.3.9 Remote Probe Connector. (With the –C
option, the internal valves operate automatically.)
Teledyne Analytical Instruments
Part I: Control Unit
Part I 3-