GDC-350 Operation Manual
5909-9000 Rev 1
25
Once all desired time delay settings have been achieved, move the jumper back to
position 1 (P1) on jumper J7 and move the jumper back to position 1 (P1) on lower
the lower bank (J6). At that point, all new settings will be written to the EEPROM.
FUNCTION
J6
J7
Low alarm “ON” time delay
P4
P2
Low alarm “OFF” time delay
P4
P3
High alarm “ON” time delay
P4
P4
Audible alarm “ON time delay
P4
P5
4.7. Temperature Display – Unit of Measure
The GDC-350 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 the jumper from the resting position (P1) on the lower bank (J6) to P4 and the
jumper on J7 to P8. Pressing the UP push-button will display the temperature in
Celsius and the output between test points TP1 and TP2 is 4.0 V. If the DOWN push-
button is pressed, the temperature is displayed in Fahrenheit and the output between
the test points is 0 V.
Once the desired unit of measure has been achieved, move the jumper back to P1 on
the lower bank (J6). At that point, all new settings will be written to the EEPROM.
NOTE:
The temperature sensor is always considered channel 2
(remote).
4.8. Latching Relay Function
The GDC-350 relays can be configured as “latching” for some applications.
To achieve this, move the jumper from resting position (P1) on the lower bank jumper
set (J6) to P4. This is the system configuration position. Next, move the jumper to P9
on the upper bank (J7).
Pressing the UP push-button activates the latching function and the output between
test points TP1 and TP2 is 4 V. Pressing the DOWN push-button de-activates the
latching function and the output between test points TP1 and TP2 is 0 V.
Once the desired latching or non-latching function has been achieved, move the
jumper back to P1 on upper bank (J7) and move the jumper back to P1 on lower bank
(J6). At that point, all new settings will be written to the EEPROM.
