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Programming Features
Appendix C
Fixed Alarms
Fixed alarms (Table 31) show the On/Off status associated with the alarm.
For instance, U-sonic Echo Loss On at some time/date will appear. When the
condition ends, U-sonic Echo Loss Off will appear.
Channel Alarms
Channel alarms show the value that caused the alarm to occur or go away,
and show a status ON/OFF to indicate if the alarm occurred or went away at
that time/date:
Event Log Channel Alarms:
Set Point Sampling
In the 980 Flow Meter, set point sampling allows the control of an automatic
liquid sampler from up to 14 different sources individually or simultaneously.
Upon reaching a user-defined set point trigger, the flow meter provides an
output signal at the Sampler interface (see Wiring the Sampler on page 42)
for details on the sampler interface). This signal can be used to tell a sampler
such as the Model 900 Sampler that a set point condition has been reached
and samples should be taken.
Set Point sampling defines a set of limits that inhibit sampling until an
upset condition occurs, causing the limits to be exceeded. In this manner,
time and money and collecting and testing samples that are within limits is not
wasted, because sampling is enabled only when the waste stream falls
outside the set points.
Table 31 Event Log Fixed Alarms
Event Explanation
MEMORY BATTERY Internal memory battery is low.
MODEM FAILURE Modem chip/modem board failure.
U-SONIC ECHO LOSS No return signal detected.
XDUCER RINGING The return signal is detected too soon.
U-SONIC FAILURE Ultrasonic board detects an error.
RS485 TIMED OUT Communication problem with RS485.
• LEVEL • FLOW
• FLOW RATE OF CHG • pH
• RAINFALL • CH5
• CH1 • CH6
• CH2 • CH7
• CH3 • VELOCITY
• CH4 • TEMPERATURE