Copyright 2013 Baker Hughes Company.
48 | DPI
620G Instruction Manual–English
Chapter
4.
Electrical Tasks
SETTINGS
> MANUAL CJ COMPENSATION
If using an external cold junction, select check box on MANUAL CJ COMPENSATION and
enter value for cold junction compensation temperature.
If Manual CJ compensation is not selected, the internal cold junction is used to calculate the
thermocouple value.
6. Select Burnout Detection if required by tapping the associated check box.
4.11 Switch Test
When setting the Switch Test utility on any channel, the software automatically sets up a separate
channel for the switch connections.
•
CH1, P1, P2 and IDOS/TERPS functions use the CH2 switch connections.
•
CH2 functions use the CH1 switch connections.
Note:
If there is a measure or source function on the switch connection channel it is automatically
disabled. The display will show a screen message:
Figure
4
-
18: Switch Test Channel Conflict Message
Figure
4
-
19: Thermocouple Switch Test
1. Set the applicable channel options:
•
The TC function is set to source a temperature.
•
The UTILITY is set to Switch Test. The AUTOMATION is set to Ramp.
2. Complete the electrical connections.
3. TC is a CH1 function, so the switch connections must be on CH2.
4. For the Ramp process, set START and STOP values that are applicable to the switch value.
5. To get an accurate switch value, set a long TRAVEL period.
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