Instruction manual

MODEL XMT-C SECTION 8.0

CALIBRATION — CONDUCTIVITY

SECTION 8.0

CALIBRATION — CONDUCTIVITY

The following procedures are described in this section:

• Entering the cell constant (Section 8.1)

• Zeroing the transmitter (Section 8.2)

• Calibrating the sensor in a Conductivity Standard (Section 8.3)

• Calibrating the sensor to a Conductivity Meter (Section 8.4)

• Entering the temperature slope (Section 8.5)

INTRODUCTION

Calibration is the process of adjusting or standardizing the transmitter to a lab test (such as free acid titration) or

a calibrated laboratory instrument, or standardizing to some known reference (such as a commercial chemical

standard). Calibration ensures that the transmitter reads an accurate, and therefore, repeatable reading of con-

ductivity and temperature. This section contains procedures for the first time use and for routine calibration of the

Model Xmt-C transmitter.

Since conductivity measurements are affected by temperature, the Model Xmt-C reads the temperature at the

probe and compensates for the changing temperature by referencing all conductivity measurements to 25°C

(77°F).

To ensure the transmitter's accuracy, it is important to perform all the calibration procedures provided in this sec-

tion if you are:

• installing this unit for the first time

• changing or replacing a probe

• troubleshooting

After the initial calibration, the accuracy of the conductivity reading should be checked periodically against some

known standard of conductivity and temperature.

Entering the cell constant, zeroing the instrument, and calibrating the sensor should be done when first commis-

sioning the Xmt and when changing the conductivity probe. These operations should be conducted with the con-

ductivity probe wired to the transmitter with full length of extension cable (if any) for best results.