Metex 2200C Conductivity Analyzer/Controller - Manual (Page 26)

Model 2200C Page 24
from the line voltage terminals or perhaps from a separate breaker or DC supply.
Use the TEST menu feature to simulate the input values to observe the switching
points.
Check that your process control elements can function independently of the 2200C.
Next check with a test light or an Ohmmeter (power off to the relay contacts, wires
to the control elements disconnected) that the contacts of the respective relay are
making contact when actuated. If a relay is malfunctioning, it may be necessary to
change it. See Section below.
9.1.4 If the process value seems wrong, clean the cell as described in the cell manual.
Inspect the cell, wire and interconnections. Calibrate and resume operation.
9.1.5 To find out whether the problem is in the sensor, or in the analyzer, use the self-
testing features. Leave the instrument in RUN mode and proceed as follows:
a) Move the slide switches S41 and S42 on the back of the swing-out panel from
position "ON LINE" to position "TEST."
b) Connect a test resistor R68 to the TB3 terminal strip on the swing-out
board according to the following table:
Range uS Required Cell Constant R68 Value
0-2uS 0.01 10,000
0-5 uS 0.01 4000
0-10 uS 0.05 10000
0-20 uS 0.05 5000
0-50 uS 0.05 2000
0-100 uS 0.05 1000
0-200 uS 0.5 5000