Commissioning RIA452
36 Endress+Hauser
Integration function/totalizer
With this function, the computed value from the linearization table, or of the current flow
rate for channel calculation or of the analog input can be numerically integrated to create a
totalizer for example.
The totalizer is calculated as follows:
The measuring interval is 0.1 s.
In most instances, the integration basis is the same time unit as the time basis of the signal
to be integrated.
Example: analog input l/s integration basis s
Simple preset counter
G09-RIA452ZZ-15-00-xx-en-010
Fig. 20: Simple preset counter
If the preset counter is activated, limit values 1 and 2 are permanently assigned to the preset
counter function (output 1 = main switchoff, output 2 = preliminary switchoff). Digital input
1 is permanently assigned to the "Reset and restart preset counter" function.
Thus, the number of free relays available is reduced accordingly. The operating menus for
these inputs/outputs are then hidden.
Set count B (LV B) defines the preliminary switchoff, Set count A (LV A) defines the main
switchoff. Limit value (or start value, see "Pre-counter" function → ä 32) for LV A and
preliminary alarm value for LV B are freely configurable
The positive counting direction is defined as follows: starting at the fixed starting value of
zero, count up until the set limit value is reached (Set count A).
The negative counting direction is defined as follows: starting at the configurable starting
value (Set count A), count down until the fixed limit value of zero is reached.
The counter is reset and restarted at the same time by means of digital input 1 (Digital
Inp.1). Edge Digital Inp.1: Low-High = reset and start counter.
Calculation formula for flow measurement
If you selected "Formula" under Calc. flow for flow measurement, the flow is calculated using
the following formula:
Where:
• Q: Flow rate in m
3
/h
• C: Scaling constant
•h: Headwater level
• α, β: Flow exponent
• γ: Weighting factor
The display of the preset counter can be configured under DISPLAY/M2 … "Ref.num"
= "Batch".
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