Lighthouse RLPC 0.1mm, Operating Manual

Page: 49 / 60

Technical Data
248083296-1 Rev 3 5-3
OUTPUT
• Outputs counts on CH1 and CH2 lines in 4-20 mA output currents.
• When counts are greater than the alarm threshold, after a "suppress"
# of consecutive alarm conditions, the Alarm Relay is turned on.
ALARM
If the CH1 or CH2 count exceeds the programmed ALARM threshold
then:
• The red SERVICE indicator on the instrument blinks.
• The EXTERNAL ALARM relay, described below, is set.
SERVICE ALERT
If the service/background light voltage is greater than the Service High,
or less than Service Low limits, then:
• CH1 and CH2 outputs are set to 2mA.
• The red SERVICE indicator on the instrument is turned on steady.
• If STATUS = 4 mA ==> No Alarms and No Service Alerts.
EXTERNAL ALARM
An ALARM condition, as described above, also closes a relay inside
the instrument. Contacts of that relay are connected to the DATA
connector, pins 8 (-) and 9 (+). The user may use an external power
supply and a buzzer or light stick to provide local indication of an
alarm condition. The contacts are rated at 40VDC, 1A maximum.