Alarm Operation
4-1
4
4.1 Alarm Description
The chart recorder is equipped with an alarm system which is activated when
the sensor conditions exceed user-set limits. The system consists of a built-in
audible piezo-electric beeper and a set of normally open dry relay contacts for
activating an external alarm. The contacts are rated for 2 amps at 110Vac or 2
amps at 30Vdc. The contact terminals are mounted on the rear of the recorder
(refer to Figure 4-1). In addition, the LCD display will flash upon alarm
activation.
Figure 4-1. Alarm/Relay Contacts Location
4.2 Checking Alarm Limits
WAIT UNTIL THE UNIT HAS STABILIZED AND THE PENS STOP MOVING
BEFORE PRESSING ANY KEYS ON THE KEYBOARD.
• Depending on the Display Selection Switch position, the display will
be in °F, °C, or %RH for the alarm limit viewing.
• The word ‘hi’ and the high limit value of the alarm may be seen on the
display after pressing the “HIGH” button on the front panel.
• The word ‘lo’ and the low limit value of the alarm may be seen on the
display after pressing the “LOW” button on the front panel.
The alarm limits are stored in permanent EEPROM memory
and will not be lost even if power is interrupted and battery
backup fails.
To Next Page
Loading...
