Owner's Manual

GDX-350 Sensor Transmitter
P/N: 5600-9001 Rev 2 37
Menu Item Description
TX Sensor Life
(Default is set for YES) Causes the GDX-350 4-20 mA output to transmit a
sensor life value after successful calibrations during the CAL PURGE delay
(see Section 4.1 on page 29). Normal operation is such that the GDX-350
transmits 4 mA during the CAL PURGE delay. But with TX Sensor Life =
YES it transmits 4 mA for the first 10-seconds, then for 5-seconds transmits a
value between 4 mA and 5 mA, with 4 mA equal to 0% sensor life and 5 mA
equal to 100% sensor life (see Figure 5-6). The output then returns to 4 mA
for the remainder of the CAL PURGE delay. For example, if after a calibration
the sensor life is 75%, the GDX-350 transmits 4.75 mA during the 5-second
interval.
NOTE: TX Sensor Life should always be set for NO unless the 4-20 mA receiver is capable of
interpreting the sensor life signal. The Bacharach, Inc. GDX-1600 Controller is capable of this
function.
Figure 5-6: Transmit Sensor Life Timing Diagram
5.4. Alarm Settings
The Alarm Settings page has the Alarm 1, 2, 3 Setups, Relays and Event Log submenus shown in
Figure 5-7. Alarm 1, Alarm 2 and Alarm 3/Fail menus are identical and therefore described only once in
this section.
IMPORTANT: Alarm functions and their associated LEDs are active without the
Relay/Modbus (P/N 5600-0007) option installed.