Calibration And Compensation; Calibration Of The Temperature Sensor; Calibration Frequency; Calibrating The Osensor - Waltron 9065C Instruction Manual

Calibration and Compensation

5 CALIBRATION AND COMPENSATION

CALIBRATION OF THE TEMPERATURE SENSOR

5.1
The temperature sensor is a precision component that does not require calibration.
The temperature sensor can be checked by allowing a flow of liquid through the measurement
chamber unit and comparing the temperature displayed on the 9065C to a reading from an
accurate thermometer placed in the product outlet flow of the 9065C.
CALIBRATING THE O
5.2
Since the oxygen sensor only experiences a very slight amount of wear as a result of exposure,
regular calibration is not necessary. It has been empirically determined that after 1 million
exposures (equal to 1 million O
ppb and that at higher O
There is a light pulse counter integrated in the software, which counts the number of light
exposures. When 1 million exposures have taken place, the warning "Calibrate or replace the O
sensor" will be displayed and the sensor must be calibrated or replaced. The warning symbol will
be displayed as a reminder.
After successfully calibrating the sensor, the light pulse counter will be reset and the warning
symbol will no longer be displayed.
The following two principle methods are described to calibrate the oxygen sensor:
1. One point calibration

This method is recommended if a high accuracy for higher oxygen concentration is
required.
2. Calibration with two gasses

This method is recommended to ensure the specified accuracy over the whole oxygen
measuring range.

CALIBRATION FREQUENCY

5.2.1
Assuming a rate of 500 measurements per day, 7 days a week, 52 weeks a year, the sensor must
be calibrated once every five years.
A monthly check of the zero point is recommended (also as a result of ISO procedures) and can
easily be performed by:

Flushing the 9065C with a class 5 CO

Filling the 9065C with a zero-point liquid without O
(Na SO
2 3
The temperature of the 9065C and the sodium sulfite solution/calibration gas must not deviate by
more than 1.5ºC.
27
SENSOR
2
measurements), the O
2
values, no deviation is detectable.
2
; 2%).
deviation from the zero point is just 5
2
or N calibration gas.
2 2
, such as a sodium sulfite solution
2
9065C Portable Luminescent Dissolved Oxygen Analyzer
2
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