Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 178
The diagram in Figure 1 Sampling and Averaging shows the details of when the samples
are taken.
Sampling will start as soon as recording is turned on and the time is within the desired sampling
period. When it is time to output a measurement, if the system has made fewer than ½ of the
desired number of measurements, the data is marked with the “B” status. This can happen
because the sampling interval is set too short for the input or the system was started late in the
cycle.
Hint: use the “Report Debug” command to see the sequence of events as the system
implements the measurement processes.
Understand Alarms and Alarm Transmissions
The 8310 can be set up to detect alarms on sensor values and to make transmissions as a result
of an alarm. This section describes alarm detection and notification in detail. Anyone using
alarms should make sure they understand the concepts presented here.
The user sets alarm conditions on individual outputs from the ouput’s menu. Here’s an example,
showing a menu with HiLimit, LowLimit, and HiROC alarms defined:
Name Stage
Units
RightDigits 2
Processing ► None
Display Yes
M1.O1: Log \Flash Disk\data.log
LoggingInterval 00:15:00
RecordID <None>
HiLimit Alarm Threshold = 5
HiROC Alarm Threshold = 10
LowLimit Alarm Threshold = 0
Add Alarm
Delete Alarm
AlarmDeadband 5
AlarmLogging InAndOut
IsSSPCurData Yes
SSP Settings ►
Iridium COM2: ► Iridium Settings
End M1.O1: Stage
The 8310 tests for alarms each time the measurement produces an output. An output enters
alarm when the output value extends outside the specified limit. An output enters hi-limit alarm
when the output value exceeds the HiLimit Threshold. An output enters low-limit alarm when
the output value falls below the LowLimit Threshold. An output enters hi-ROC (rate of change)
alarm when the change in the output value since the reference specified by HiROCInterval,
exceeds the HiROC Threshold. When HiROCInterval is SinceLastTx, the rate of change is
calculated between the current value and the last value that triggered an alarm transmission.
When HiROCInterval is SinceLastMeasurement, the rate of change is calculated between the
current value and the last measured value.
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