Aquametrix 2200C Conductivity Controller User Manual - Manual (Page 24)

9.1.2 If your 2200C appears dead or intermittent, check the breaker, make sure that the
instrument is set up for the available line voltage and make sure the line voltage is
actually available at the terminals. Now measure that sufficient voltage is available
at all times; it should be 98 Vac to 132 Vac or 187 Vac to 243 Vac respectively.
Shut line power off, making sure it is off. CAUTION: Power to the relays may be
supplied from a separate source, shut it off too. Check and if necessary replace the
internal 0.25A fuse. Push the connector of the ribbon cable firmly into its socket. If
these steps do not solve the problem it may be necessary to replace the power
supply board. See Section 9.3.1 below.
9.1.3 Should your process control element e.g. pump, valve or alarm not be activating,
check that the correct power is supplied to the "floating” relay contacts, jumped over
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: