Owner's Manual

GDX-350 Sensor Transmitter
P/N: 5600-9001 Rev 2 31
4.2. Alarm Operation
GDX-350s have front panel LED indicators for Alarm 1, Alarm 2 and Alarm 3. An optional Relay/Modbus
board (P/N 5600-0007) adds K1, K2, and K3 relays for these alarms.
CAUTION: GDX-350 Alarm LED indicators function even without the presence of the 5600-
0007 Relay option. With 3-Wire 4-20 mA operation, alarm LEDs flash when new and
becomes steady after the operator selects ACKNOWLEDGE by pressing the UP/RESET
key.
4.3. Alarm 3 – Understanding Fault/Level Operation
The “A3” alarm is typically dedicated to FAULT conditions indicating sensor failures or “out of
measurement range” conditions. However, some applications require a third level alarm. The A3 menu is
identical to A1 and A2 and may be set to trip at an upscale level value. A3 will also trip with missing or
failed sensors regardless of the level value.
CAUTION: Missing or failed sensors always trip Alarm 3 and relay K3 (if equipped). This is
true even with A3 configured as a level alarm and it must be realized that A3 level alarm
events might be caused by the monitored level or by a missing or failed sensor.