User guide

I-E67-84-1B February,2002 14-9
5. Check the conductance of the sensor
measurement electrode by measuring across the
blue and green leads. The conductance must be
1 to 10 nS when the sensor and solution in
contact with the sensor is at 25 C. (If the
o
sensor and solution are above or below 25 C,
o
the conductance value can be estimated as one-
half the conductance for every eight degrees
above 25 C or double the conductance for every
o
eight degrees below 25 C.)
o
6. Check the voltage of the sensor reference
electrode by measuring across the black lead
for the sensor under test and the black lead
of a known good sensor. For this test, the
sensor under test must be removed from the
process and placed into a buffer solution.
The known good sensor must also be placed in
the same buffer solution. The voltage must be
between -180 mV and +180 mV.