Yokogawa µR20000 - Manual (Page 231)

12-3
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12.2 Alarm Functon Specfcatons
Item Specfcatons
Number of alarms Up to four alarms (level) for each measurement channels.
Alarm types High limit (H), low limit (L), difference high limit (h), difference low limit (l), high limit on rate-of-
change (R), low limit on rate-of-change (r), delay high limit (T), delay low limit (t). The symbol
indicating the alarm is given in parentheses.
Rate-of-change calculation interval of rate-of-change alarms (can be set individually for the high
limit on rate-of-change and low limit on rate-of-change alarms)
Rate-of-change calculation interval = Scan interval × the number of sampled data
where the number of sample data is a value between 1 and 15
Alarm delay time of delay high and low limit alarms (can be set for each channel, common within a
channel)
1 to 3600 s (1 hour)
However, if the alarm delay time setting is not an integer multiple of the scan interval, the alarm
delay time is set to a value that is the first integer multiple of the scan interval exceeding the
delay time setting.
Hysteresis Set a width to the value for detecting alarm occurrence/release (common to all channels and all
levels)
Applied to high limit alarm and low limit alarm.
Hysteresis range: Approx. 0.0% to 1.0% of the recording span (0.1% steps)
Display Indicates the alarm occurrence status on the display.
Indication for each channel: Displays the alarm type (display precedence: H, L, T, t, h, l, R, and r).
Alarm summary display: Displayed using an icon.
Displays the alarm point mark and status on the bar graph.
Non-hold/hold operation of alarm indication
Turn ON/OFF the indication along with the alarm occurrence/release (non-hold) or hold the
indication until the alarm ACK operation.
Alarm relay contact output (optional specifications)
See section 12.5