Measuring Circuit Monitoring, Optional Boards - JUMO AQUIS touch S Assembly Instructions Manual

20.2.6

Measuring circuit monitoring, optional boards

Input/Sensor
pH-value (glass elec-
trode)
pH-value (ISFET)
Resistive conductivity
Inductive conductivity
Universal input for con-
nection of: voltage/cur-
rent signal, RTD
temperature probe
Universal input for con-
nection of: resistance
transmitter
a
With impedance monitoring and detection of deposits, the sensor alarm is tripped in case of a fault.
Monitoring via impedance measurement can also be activated.
The following points should be observed to ensure correct function:
Impedance measurements are possible only with glass-based sensors.
Sensors must be connected directly to an analysis input for pH/Redox/NH
Impedance converters must not be installed in the measuring circuit.
The maximal admissible cable length between sensor and device is 10 m.
Liquid resistance has a direct impact on the measurement result. It is therefore advisable to activate the im-
pedance measurement in liquids at a minimum conductivity of approx. 100 µS/cm.
b
Errors in the measuring circuit (short circuit or line break) lead to display errors (underrange or overrange
or inadmissible value).
Underrange / Short circuit/
overrange sensor break
Yes Configurable
Impedance mea-
surement
Yes No
Yes No
Yes No
Yes No
b
No No
20 Technical data
open circuit
Configurable
Impedance mea-
a
surement
b b
No
b
Configurable
b b
No
b b
No
b b
No
3
Special fea-
tures
-
a
-
Only with
4-wire circuit
-
-
-
on the device.
a
117