Critical Environment Technologies GEM-II, Руководство по эксплуатации

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© 2014 All rights reserved. Data subject to change without notice. 45
Rev. E | 2014.10 GEM-II - Operation Manual
FUNCTION UPPER JUMPER BANK “J7”
Low alarm “ON” time delay P2
Low alarm “OFF” time delay P3
High alarm “ON” time delay P4
Audible alarm “ON time delay P5
7.8 Temperature Display - Unit of Measure
The GEM systems all have an “on board” temperature chip from which information is used to
temperature compensate certain sensors. This temperature chip can also be used as a second
sensor in applications where the user requires both a gas measurement and a temperature
measurement. To switch between Celsius and Fahrenheit displayed values, follow this procedure.
Move jumper from resting position (position-1) on lower bank jumper set (J6) to position-4 and
jumper on J7 to position-8. Now pressing the “UP” push-button will display the temperature
in Celsius and the output to test points “TP-1” and “TP-2” is 4.0 V. If the “DOWN” push-button is
pressed, the temperature is displayed in Fahrenheit and the output to the test points is 0 V.
Once the desired unit of measure has been achieved, move jumper back to position-1 on upper
jumper bank J6. At that point, all new settings will be written to the EEPROM.
NOTE: Temperature sensor is always considered channel-2 (external).
7.9 latching Relay functions
The GEM relays can be configured as “latching” for some applications.
To achieve this, move the jumper from resting position (position-1) on lower bank jumper set
(J6) to position-4. This is the system configuration position. Next, select the jumper position-9
on upper bank jumper set (J7).
Pressing the “UP” push-button activates the “latching” function and output to test points “TP-1”
and “TP-2” is 4 V. Pressing the “DOWN” push-button de-activates the latching function and the
output to test points “TP-1” and “TP-2” is 0 V.