Overview pH 1970i
8
ba75690e01 01/2007
1.3 Socket field
Sensors You can use the following sensors with the pH 1970i:
z pH depth armature, or
z pH electrode (combination electrode or pH electrode + reference
electrode).
z Option: External temperature sensor
Please make sure that only one pH sensor is connected at the same
time.
Connectors
Note
The sensor sockets, 1 and 2 must not be assigned at the same time.
Warning
Only connect electrodes to the measuring instrument that cannot return
any voltages or currents that are not allowed (> SELV and > current cir-
cuit with current limiting). Nearly all electrodes - especially WTW elec-
trodes - fulfill these conditions.
Sensor / Instrument Socket
pH depth armature 1
pH electrode or pH combination electrode 2
pH combination electrode with temperature sensor 2 and 4
Reference electrode 3
Temperature sensor, external 3 and 4
Printer or PC (serial interface, RS232) 5
Plug-in power supply unit 6
Watertight valve for internal pressure equalization 7
1
3
4
2
5
6
7
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