33
O&M Manual
Rev-G (7/15)
Part 6 – System Maintenance
6.1
System Checks
1.
If the FAIL icon is flashing on the display, check the Fault List to determine
the cause of the failure. To access the Fault List, press the MENU/ESC key
until the DIAG menu appears. Then press the UP arrow key until the Fault
List appears. Press the ENTER key to access the Fault List, and the highest
priority fault message will be displayed. For a list of all messages and
possible causes/solutions, refer to Section 7.3.
2. Perform a one-point calibration prior to sensor installation.
3. Check sensor cable color to terminal strip markings.
4. For highly unstable behavior, remove sensor from the process and measure
the process solution in a plastic beaker. If the reading now stabilizes, place
wire in beaker solution and actual process solution to determine if a ground
loop exists.
6.2
Instrument Checks
1. Remove sensor completely and connect 1100 Ohms from the yellow to black
sensor input leads. Make sure the unit is configured for a Pt1000 thermal
element and that the temperature is not in manual locked mode. The
temperature reading should display approximately 25 °C and the conductivity
reading should display approximately 0.0 uS.
2. With a DMM, measure the DC voltage from the white sensor lead connection
to the black sensor lead connection. With the positive DMM lead on the white
wire, the meter should read between -4.5 and -5.5 VDC.
