July 2022
© RLS Wacon analytics GmbH +49 (0)5121 281260
Pag
e
38
Subject to
change without notice
Connection of external components
Analogue current interface
The current measured value is available as an analogue value at terminals 11 and 12. Recorders or
external devices can be connected to process the measured value. You can choose between a
current output 0 - 20 mA value or 4 - 20 mA value. You must also determine which current value of
20 mA corresponds to which measured value.
Programming: Menu > Settings > Outputs > Current interface type
Programming: Menu > Settings > Outputs > Calibrate current interfaces.
(Enter the measured value to correspond to 20 mA. )
The supplied current of the current loop for the displayed measured value is calculated with:
𝐼 = 𝐼
0
+
(20 𝑚𝐴 − 𝐼
0
) ⋅ 𝑀𝑒𝑠𝑠𝑤𝑒𝑟𝑡
𝑜𝑏𝑒𝑟𝑒𝑟 𝑀𝑒𝑠𝑠𝑤𝑒𝑟𝑡
[𝑚𝐴]
Depending on the operating mode, 0 or 4 mA must be used for
I .
0
The number "
upper measured value"
corresponds to the entered measured value for 20 mA.
Usually the end of the measuring range of the reagent used is used.
We recommend setting the upper reading to the end of the reagent
measuring range.
