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Section 4
Page 73
Alarm Relays
4.4 Alarm Relays
4.4.1 Programming the Alarm Relays
Alarms can be programmed to activate based on certain conditions (low
battery, low memory, etc.). Refer to 980 Alarms Flow Chart on page 152.
When an alarm is tripped, an action is initiated (report via modem, dial a
pager, or set a relay). There are two types of alarms:
• Trouble Alarms
• Set Point Alarms
4.4.1.1 Trouble Alarms
Trouble Alarms initiate an action when a trouble condition occurs.
For example, a relay may close when the memory is full.
Set Point Alarms look for trip points to be reached (either high or low or both)
before initiating an action. For example an initiated action may be the closing
of a relay when the water level exceeds 24 in. (60 cm) or drops below 4 in.
(10 cm).
1. From the Main Menu, select
OPTIONS> ADVANCED OPTIONS > ALARMS.
2. Select an action to occur when the alarm is activated. Table 26 shows
each Trouble Condition and its cause.
3. Enable one of the trouble conditions.
Table 26 Trouble Alarms
Trouble Condition Cause
Low Memory Battery Internal memory battery voltage is too low. Change batteries.
U-Sonic Echo Loss (A pulse of
sound was sent but no echo was
received back)
The echo has been temporarily deflected by a change in site conditions such as floating
debris or foam in the channel, wind, etc.
Transducer Ringing Transducer is operating within the deadband.
U-Sonic Failure Transducer not plugged in. Cable damaged. Transducer thermal sensor damaged.
Modem Failure Unable to initialize modem
RS485 Timed Out
Problem with communications between the flow meter and a remote ultrasonic sensor.
May indicate open thermal sensor.
Alarm Action(s):
Set Relay #1
Set Relay #2
Set Relay #3
Set Relay #4
Report via Modem