Biuged BGD 285 Інструкція з експлуатації - Сторінка 4

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a) ATC mode: Put the selection knob on "℃". The value displayed means the temperature of the

medium to be measured. At the same time the temperature signal be sent to the pH-t mixture circuit

to compensate the pH value.

b) MTC mode: Remove the temperature sensor, Put the selection knob on MTC and "℃" position.

Adjust the temperature regulation knob until the value of temperature displayed is same as the

indication value of thermometer pluged in the medium to be measured. At the same time the

temperature signal be sent to the pH-t mixture circuit to compensate the pH value manualy.

2.3 Calibration

Before operating, i.e. before measuring the solution to be measured, the instrument should be

calibrated. However, it does not mean that it must be calibrated before operating each time. For

successive operating, in general, it will be calibrated once a day.

There are two methods of calibration, one is one point calibration for normal use and the other is two

points calibration for exact measuring.

2.3.1 One point calibration procedure (taking ATC for example):

a) Remove the Q9 short circuit plug, Link the compound electrode and the temperature sensor, clean

the electrode with distilled water and blot it with filter paper, then plug the electrode into the buffer

solution (pH=4 or pH=9.18).To measure the temperature first, put the selection knob on "℃" and

ATC position, The value displayed means the temperature of the medium to be measured.

b) Put the selection knob on "pH", turn the slope knob to the end clockwise, adjust setting regulator

until the value displayed equals to the standard pH (pH=4 or pH=9.18).

Note: The "setting" knob will not be changed after calibration finished.

2.3.2 Two points calibration procedure:

a) Taking ATC for example. Remove the Q9 short circuit plug, Link the compound electrode and the

temperature sensor, clean the electrode with distilled water and blot it with filter paper, then plug the

electrode into the buffer solution (pH=6.86).To measure the temperature first, put the selection knob

on "pH", The value displayed means the pH of the standard buffer solution (pH=7).

b) If the solution to be measured is acidic, take out the electrode from the solution of known pH value

(pH value =6.86), clean the electrode with distilled water and blot it with filter paper, then plug it into

the buffer solution of known pH value (pH value = 4). Adjust the slope regulator until the value

displayed means the pH of the standard buffer solution (pH=4).

c) If the solution to be measured is alkalescent, we can calibrate the meter secondly with the solution

of known pH value (pH value =9.18). Adjust the slope regulator until the value displayed means the

pH of the standard buffer solution (pH=9.18).

The calibration of the instrument is completed. Once the instrument has been calibrated, its SETTING

potentiometer should not be changed any more .

2.3.3 Calibration with MTC to reference 2.2 (b).

3. pH value measurement

a) In case that the temperature of the solution to be measured the same as the temperature of the

setting solution.

Rinse the end of the electrode with distilled water, and suck it dry with clean filtering paper.Put the