Metex 2200C Conductivity Analyzer/Controller - Manual (Page 25)

Model 2200C Page 23
8.4.1 Invalid Alarm will be indicated if the Low Alarm is set higher than the High Alarm.
To correct, refer to Section 5.6 and 5.7.
8.5 Invalid Setpoint
8.5.1 The deadband setting must be lower than the Setpoint if you are controlling rising
conductivity, and higher than the Setpoint if you are controlling falling conductivity.
If you have not made these settings correctly, invalid entry will be indicated by a
flashing LED. To correct, refer to Section 5.4 and 5.5.
9.0 TROUBLESHOOTING AND SERVICE
9.1 Isolate the cause
9.1.1 When a measurement problem occurs, the first step is to try to isolate the cause. If
the 2200C is powered, go through the menu and check your settings. A convenient
way to do this is to call TEST. See Section 5.7
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