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Chapter 3 Starting and Stopping this Device
(4) Checking the Settings
For information about setting the following descriptive parameters, see the operating manual for
the relevant communicator.
(i) Setting the alarm
Based on the results from the Preparation section, set the variables for the upper and lower limits of
standard deviation.
Standard Deviation High Limit: The possible setting range is 0 and above.
Standard Deviation Low Limit: The possible setting range is 0 and above.
Next, set the operating mode of the standard deviation alarm.
Standard Deviation Alarm Use: The possible settings are shown below.
Disabled: Alarm is not used.
Enabled (High): Upper limit only
Enabled (Low): Lower limit only
Enabled (High and Low): Upper and lower limits
(ii) Alarm detection
If a standard deviation alarm is detected, it is reported as the appropriate self-diagnostic status. See
section "4-4 Troubleshooting"
(iii) Number of samples
The number of samples of pressure used to calculate the standard deviation is set at 1,000 at the
factory. The sampling interval is approximately 60 ms ; the standard deviation is calculated once
every 60 seconds (approx.).
To change the number of samples, use the following parameter:
Standard Deviation Sample Count: Can be set in a range from 1,000 (approx. 1 minute) to 60,000
(approx. 1 hour).
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