
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048 Page D-6
1.6. Rate of Change Process
Inputs: 4 Any sensor or process output
Outputs: 1 Average rate of change within collection interval
2 Most recent rate of change since last call to this process
E1 Process Error Code
Assumptions: The data input should not be updated more often than once per second.
This process calculates the difference between the current input value (x
i
) and the input value from the
previous call to this function (x
i-1
). The difference is divided by the time elapsed between the
consecutive inputted values (t
i
and t
i-1
):
The immediate rate of change (r) and average rate of change (r
avg
) are calculated as follows:
The average rate of change is reset at the beginning of each Sample Duration.
1.7. Differential Process
Inputs: 4 Any sensor or process output
5 Any sensor or process output
Outputs: 1 The average difference value
2 The most recent difference value
E1 Process Error Code
Assumptions: The data inputs should both be on same sample timing loop.
The second input value (y
i
) is subtracted from the first value (x
i
) to find the immediate difference (∆
i
),
and an average difference (∆
avg
) is calculated over the course of the Sample Duration:
The average difference value is reset at the start of each Sample Duration.
1
1
ii
ii
ttt
xxx
n
i
iavg
ii
ii
i
r
n
r
tt
xx
t
x
r
1
1
1
1
n
i
iavg
iii
n
yx
1
1
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