Installation
pH 170/
pH 296
105
"SENS-CHECK" connection
The "SENS-CHECK" relay is designed as a closing contact that is electrically
isolated from the instrument; it is then always active (= closed) if a sensor error
occurs.
This message is also output on the display.
Sensor errors in the switching station are displayed using the relay.
Note:
The relay contact should only be loaded with a maximum of 250 VAC / 5A up to a
maximum of 150 W.
REC 1 / REC 2 connections
The REC 1 (pH/mV) and REC 2 (temperature) current outputs can be configured
as follows:
•
0 to 20 mA
•
4 to 20 mA
If terminals with a common earth are used, ensure the exact polarity of the direction
of the current flow (+ / – ). It involves active current sources that require no external
current source!
Do not use an external current source as this can lead to
malfunction of the current outputs!
Maximum load of 600 Ohm.
K1 / K2 (relay contacts)
The K1 and K2 relay contacts are designed as potential-free closers (make
contacts).
These contacts can also be configured as openers (break contacts) via the
configuration level. The assignment of the relay to the corresponding functions is
undertaken by the software configuration.
Note:
The contacts are designed for 250 VAC / 5A with, however, a maximum of 150 W.
