Liquiline System CA80SI
Operation
Hauser
115
Menu/Setup/Additional functions/Mathematical functions/MF1 to 8/Mode = Formula
Function
Options
Info
Formula
User-defined text
Make sure the exact notation is used
(upper case). Blank spaces before and after
mathematical characters are irrelevant.
Note the operator precedence, i.e.
multiplication and division take
precedence over addition and subtraction.
Use parentheses if necessary.
Result unit
User-defined text
You may enter a unit for the calculated value if
desired.
Result format
Selection
• #
• #.#
• #.##
• #.###
• #.####
Factory setting
#.##
Select the number of decimal places.
Result numeric
Read only
Current, calculated value
Mathematical function
assignment view
Overview of the configured functions
Example: 2-point chlorine regulator with volume flow monitoring
A relay output activates a dosing pump. The pump should switch on when the following 3
conditions are met:
• (1) There is flow
• (2) The volume flow is above a defined value
• (3) The concentration of chlorine drops below a defined value
1. Connect a binary input signal from an "INS" point level switch of the CCA250
assembly to the DIO module.
2. Connect an analog input signal of a volume flow meter to the AI module.
3. Connect the chlorine sensor.
4. Configure the
Formula
mathematical function:
Source A
= binary input DIO,
Source
B
= current input AI,
Source C
= input
Disinfection
.
Formula:
A AND (B > 3) AND (C < 0.9)
(where 3 is the lower limit value of the volume flow and 0.9 is the lower limit
value of the chlorine concentration)
5. Configure the relay output with the
Formula
mathematical function and connect the
dosing pump to the corresponding relay.
The pump is switched on if all 3 conditions are met. If one of the conditions is no longer
met, the pump is switched off again.
Instead of outputting the result of the formula directly to a relay, you can also connect a
limit switch in between in order to attenuate the output signal via a switch-on and switch-
off delay.
Example: Load-based control
The load - i.e. the product of the concentration and volume flow - is needed for the dosage
of precipitants, for instance.
1. Connect an analog input signal of a volume flow meter to the AI module.
Содержание Liquiline CA80SI
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