Electrical connection Oxymax COS22
14 Endress+Hauser
6 Electrical connection
L
WARNING
Device is live
Incorrect connection may result in injury or death.
‣
The electrical connection may be performed only by an electrical technician.
‣
The electrical technician must have read and understood these Operating Instructions
and must follow the instructions contained therein.
‣
Prior to commencing connection work, ensure that no voltage is present on any cable.
6.1 Connecting the sensor
A multi-core COK21 measuring cable is used for the electrical connection of the sensor to
the transmitter.
PK
GN / YE
BN
YE
BU
S
12
90
91
11
Assignment Terminal
External shield
Cathode
Anode
NTC temp. sensor
Active internal shield
(NTC temp. sensor)
A0005583-EN
8 Measuring cable COK21
The polarization voltage must be set at the transmitter as follows:
Standard measuring range: -650mV
Trace measuring range: -550mV
The voltage is applied between the working electrode (cathode) and the reference
electrode (anode).
6.2 Ensuring the degree of protection
Only the mechanical and electrical connections which are described in these instructions
and which are necessary for the required, designated use, may be carried out on the device
delivered.
‣
Exercise care when carrying out the work.
Otherwise, the individual types of protection (Ingress Protection (IP), electrical safety, EMC
interference immunity) agreed for this product can no longer be guaranteed due, for
example, to covers being left off or cable (ends) which are loose or insufficiently secured.
6.3 Post-connection check
Device condition and specifications Notes
Are the outside of the sensor, assembly, junction box, cable
undamaged?
Visual inspection
Electrical connection Notes
Are the installed cables strain-relieved and not twisted?
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