NEOMERIS CONTROL DES
Functional description
Build:20211025-094624-9873335NSt
All information and technical data are subject to
change
Page 45
6.12
Module: MFlowMeter2
6.12.1 Info:
Flow Meter
6.12.2 Comment:
The flow meter measures the flow rate in liters per hour and is generating the appropriate pulses
for the measured flow rate.
The incoming pulses from the flow meter are counted and output pulses are generated depending
on the pulse ratio (parameter: pulse ratio).
By setting the length of an output pulse (parameter: pulse) and the pause duration (parameter:
pause) between two output pulses, the amount of chemicals to be mixed is determined.
Then, according to the settings made, the desired amount of chemicals is added by the dosing
pump.
The flow meter measures the total volume that has flowed through it in cubic meters (m³) .
It also measures the flow rate in liters per hour, producing output pulses corresponding to the flow.
The flowmeter can be flexibly set to either pulses per liter (Pls / Ltr) or liters per pulse (Ltr / Pls) ac-
cording to the hardware used.
There are three measurement methods:
Automatic - Automatically selects between pulse counter measurement and pulse length measure-
ment based on the frequency of measurement errors that occur.
Pulse Counter Measurement - Counts the number of pulses that occur in a given time.
Pulse Length Measurement - Counts the time between two pulses.
Please set the various parameters with the following points in mind:
Set the parameter resolution and units as indicated on the flowmeter datasheet.
Parameter measuring method
If you are using a flowmeter with mechanical contacts, it is strongly recommended to select pulse
length as the measurement method.
Debouncing is only available for pulse length measurement.
If your signal does not bounce and has an input frequency greater than 10 Hz then you should use
the counter method.
Use Automatic if you are not sure which method works best. If set to Auto, the system will deter-
mine the method at startup depending on the other settings.
In this case, care must be taken that min. flow and max. flow is set to meaningful values.
Min. flow is the minimum flow that must be measured correctly.
This value is used to determine the measurement method when Auto is selected as the measure-
ment method.
