User guide

I-E67-84-1B February,2002 14-7
If the junction (especially a wood junction)
has been attacked by the process chemicals,
contact ABB for alternate junction materials.
Solution ground and O-ring seals
On TBX Advantage sensors, inspect the solution
ground (i.e., the metallic collar around the
measuring electrode if present) and sealing O-
rings for attack by the process liquid. If
the solution ground shows evidence of
corrosion or deterioration and/or the O-rings
appear distorted or swollen, contact ABB for
alternate material choices.
Sensor Electronic Test
The pH/ORP/pION sensor can be electronically
tested to verify the integrity of the sensor
elements and cable. These tests require a
Digital Multimeter (DMM) that has a
conductance function capable of measuring from
0 to 200 nS.
The sensor leads and automatic temperature
compensator leads must be disconnected from
the analyzer before these tests can be
performed. Also the sensor must be placed in
a container of water or buffer solution. If
the sensor is a standard ABB sensor (i.e.,
TB5) which does not have a solution ground and
has a BNC, the center conductor will be
equivalent to the blue lead (i.e., Sense) and
the shell will be equivalent to the black lead
(i.e., Reference). Check the sensor using the
following procedure.