Instruction manual

40
MODEL XMT-C SECTION 8.0
CALIBRATION — CONDUCTIVITY
8.4 CALIBRATING THE SENSOR TO A LABORATORY INSTRUMENT
This procedure is used to check the and correct the conductivity reading of the Model Xmt-C using a laboratory
conductivity instrument. This is done by submerging the conductivity probe in a bath and measuring the conduc-
tivity of a grab sample of the same bath water with a separate laboratory instrument. The Model Xmt-C reading is
then adjusted to match the conductivity reading of the lab instrument.
1. Choose Meter. Press ENTER. The screens at the left will appear.
2. Take a grab sample that is as close to the sensor as possible.
3. Using a calibrated laboratory instrument with automatic temperature
compensation, determine the conductivity of the process or grab sam-
ple (as close to actual process temperature as possible). Continue with
the following step if an adjustment is needed.
4. Using the arrow keys, enter the conductivity that appears on the labo-
ratory instrument. Press ENTER. The screens at the left will appear
during this standardization process.
Cal in progress.
Please wait.
Live 50.00k^
Input
55
0.00k^
Use precision
resistors only
8.5 CALIBRATING TEMPERATURE SLOPE
Conductivity is temperature-compensated per a constant linear slope of 0-5%/°C. The temperature slope currently
being used by the transmitter is displayed. If this value is acceptable, press EXIT. 2%/°C is a good value for nat-
ural waters. To change the temperature slope, complete the following procedure.
1. If continuing from the previous steps, the screen on the left will appear.
2. Scroll right until the screen at the left appears. Choose Temp Slope.
Press ENTER.
3. Enter the percent change of conductivity (μS/cm) per degrees
Centigrade. Press ENTER. All conductivity readings will be tempera-
ture compensated according to the linear slope constant that you have
manually entered.
Temperature
Slope?
22
.00%/ C
Enter Cell Const
Temp Slope >>
Cal?
IInnPPrroocceessss
Meter Zero >>