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Operate
December 2020
The factory alarm delay value is set at 15 seconds. To modify this value, connect to the
GDU-Incus with a hand-held TREX device or AMS. Please note when changing the alarm
delay that setting values 0 to 99 are in 10 second increments and 100 to 127 are in 1
second increments. 0 and 100 represent instantaneous alarms. For example, 1 represents
a 10 second alarm delay, and 99 represents a 990 second alarm delay; whereas 101
represents a 1 second alarm delay, and 127 represents a 27 second alarm delay. Therefore,
the factory alarm delay value for 15 seconds would be 115. See
information.
Table 3-1: Alarm Delays
Desired alarm delay value
15 seconds (factory default)
10
30
60
0
3.1.3
Automatic self-test
The automatic self-test checks the complete detector every 320 milliseconds by sending
an electrical signal of known amplitude through the sensing circuitry and analyzing the
result, without interrupting the normal functionality of the sensor.
If drift, component failure, or damage occurs, the automatic self-test signals a fault. Refer
to
Fault
3.2
Check sensor functionality
Emerson calibrates the sensors on the GDU-Incus at the factory; they do not need to be
adjusted. Before operation, Emerson recommends functionality checks to ensure correct
installation. On power-up, the detector performs a diagnostic check to ensure all main
functions are operational and continuously monitors the sensors via the built-in self-test.
The sensor's functionality can be verified using the GDU-01-TT Ultrasonic Test Transmitter
(see
Spare parts and accessories
1. Ensure that the background ultrasonic level is suitable for the distance of the
2. Aim the transmitter at the sensor face from a known distance. The detector's
3. Check all four sensors, if possible, by moving around the detector and repeating.
3.3
Output options
The GDU-Incus comes with the following industry-standard forms of communication:
•
Analog (4-20 mA)
34
outputs.
proposed transmitter test.
display dB level will rise according to the hand-held device used and the distance.
Actual input value in TREX/AMS
115
110
3
6
0 or 100
for more information), using the following procedure:
Reference Manual
00809-0100-3003
Table 3-1
for more
GDU-Incus
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