Operation
Liquiline CM44P
106
Hauser
T
[° C]
t [h]
18
21
23
8
12
17
0
T2
T1
A0041704
91
Time-based temperature control
1. Program
Time switch 1
(T1):
•
Start date
= 01.01.2020
•
Start time
= 08:00:00
•
Signal duration
= 09:00:00
•
Period
= 24:00:00
2. Define
Time switch 2
(T2):
•
Start date
= 01.01.2020
•
Start time
= 12:00:00
•
Signal duration
= 05:00:00
•
Period
= 24:00:00
3. Create
Formula
mathematical function.
Menu
/
Setup
/
Additional functions
/
Mathematical functions
• MF1: Formula
•
Tracking
=
On
•
Source A
=
Time switch 1
•
Source B
=
Time switch 2
•
Formula
= 18.0 + 3*NUM(A) + 2*NUM(B)
Explanation: NUM converts the logical value to a numerical value and thus enables
multiplication.
• 3*NUM(A) results in the value 3.0 from 08:00 to 17:00 and 0.0 outside of this time
period.
• 2*NUM(B) results in the value 2.0 from 12:00 to 17:00 and 0.0 outside of this time
period.
The formula thus yields one of these analog values depending on the time: 18.0, 21.0 or
23.0. This analog value can be used as a set point for a temperature controller.
Example 2: Time-based condition
A pump should switch on (via a relay) for 10 minutes every 2 hours. This only applies if
the pH value is lower than 4.0.
1. Program
Time switch 1
:
•
Start date
= 01.01.2020
•
Start time
= 00:00:00
•
Signal duration
= 00:10:00
•
Period
= 02:00:00
2. Create
Formula
mathematical function.
