Tlog Computation - Omega RD-MV100 Series User Manual

11.7 TLOG Computation

Determines the sum, maximum, minimum, average, and maximum – minimum (P–P)
values of the specified channel at specified time intervals. The interval is set by timers.
The example shown in the following figure indicates the case in which the average value
of channel 1 over each interval, TLOG.AVE(01), is determined.
Equation: TLOG.AVG(01)
Scan interval
Sampling
TLOG computation cannot be performed when the corresponding measurement channel
is set to [Skip] or the corresponding computation channel is turned Off.
Timer Mode and Action
Timer mode
There are two timer modes : absolute mode and relative mode.
• Absolute mode
Timer expires at times determined from the reference time and the interval. The
reference time is specified by the hour (00 to 23).
Example 1 : Reference time : 14:00
Example 2 : Reference time : 00:00
• Relative mode
The timer is started when the computation is started. The timer is repeated at each
interval. The timer is suspended while the power is lost.
Example :
Setting timers
Timers are set in the basic setting mode. For detail, seesection 11.9.
Setting the timer No. for TLOG computation
The number of the timer used by the channel computing the TLOG is selected from 1, 2,
and 3 in the setting mode. For the setting procedure, see section 11.8.
About the Sum Unit of the TLOG.SUM
In the sum computation (TLOG.SUM) of time series, data are summed over the scan
interval. However, for flow values that have units /s, /min, or /h, a simple summation
results in the actual value not matching the computed result, because the scan interval
and the unit of the input values are different. In these cases, the unit of the data
measured over the scan interval is converted to match the unit of the input values and
the computation is performed.
Average value
Interval set by a timer
Interval : 12 h
The expiration time is set to 2:00 (2:00 AM) and 14:00 (2:00 PM).
Interval : 10 min
The expiration time is set to 0:00, 0:10, 0:20, ..., 23:40, and 23:50. For
example, if the computation is started at 9:30, the time expiration will
occur at 09:40, 09:50, 10:00, and so on.
Interval : 00:15
The timer expires every 15 minutes after the computation is started.
Average value
Time
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