Teledyne GC-Pro/FID - Gas Chromatograph - Manual (Page 37)

GC-Pro FID Installation
Teledyne Analytical Instruments 23
1. Test the CRC. When the CRC is open, send a span command
until the CRC closes (The CRC will quickly close.)
2. When the CRC closes, remove the span command.
When CRC opens again, the span calibration is done, and the sample
is being analyzed.
3.3.2.7 ‘M EASURE O NCE ’ ( OR ONE SHOT MEASUREMENT ) CONTACTS
There are three dedicated relay contacts and these are available from
the bottom Equipment Interface Connector. They are assigned to
indicate status of ‘measure once’ (or one shot measurement). Contacts
are normally open, and they close when GC-Pro TCD switches to that
particular range.
Table 3-6: ‘Measure Once’ Relay Connections
Pin Function
9 + Start Measurement Digital Input
11 - Start Measurement Digital Input
21 IDLE Contact 1
38 IDLE Contact 2
22 IN MEASUREMENT Contact 1
39 IN MEASUREMENT Contact 2
19 MEASUREMENT DONE Contact 1
18 MEASUREMENT DONE Contact 2
MEASUREMENT DONE contact only closes for 5 seconds at end of
measurement cycle. After that IDLE contact closes. However reading is
display and analog output stays till new measurement is requested.
Digital input range is 5 to 24 vdc to start measurement.
3.3.2.9 P IN O UT T ABLE
The following table summarizes all the outputs/inputs available on
the three 50 pin D-Sub connectors on the back panel of the analyzer.