GHM Delta OHM HD50CR-AS, Operating Manual

Page: 8 / 32

HD50CR-AS
- 8 -
V1.1
4 ALARMS
For each detected quantity, two alarm thresholds can be set by the user. The alarm is
generated if the measured value falls below the lower threshold or rises above the up-
per threshold.
Exceeding a threshold is signaled:
•
acoustically, by means of the internal buzzer (if enabled);
•
visually, by lighting the alarm LEDs on the front panel (only for the three meas-
urements associated with the analog outputs);
An alarm hysteresis and a delay in the generation of the alarm can be configured for
each detected quantity.
The amplitude of the hysteresis is in percentage (0...100%) of the difference between the
two alarm thresholds. For example, if the hysteresis is 2% (default value), the lower
threshold is 10 °C and the upper threshold is 60 °C, the hysteresis in °C is equal to (60-
10)x2/100= 1 °C.
60 °C
59 °C
11 °C
10 °C
The alarm is generated after the set delay time or immediately if the “ no delay” option
is selected (default). If the alarm condition disappears before the delay time has
elapsed, the alarm is not generated.
60 °C
59 °C
11 °C
10 °C
Enabling the Buzzer Latch option, the buzzer continues to sound even after the alarm
condition has ceased.
In the event of an alarm in progress with the buzzer active, the buzzer can be silenced
for a configurable time. Once the set time has elapsed, the buzzer will resume sounding
OK OK Alarm Alarm OK
Hysteresis
Hysteresis
Upper threshold
Lower threshold
OK OK Alarm Alarm OK
Hysteresis
Hysteresis
Upper threshold
Lower threshold
Delay