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Clear-
It is used to clear the unit when error signal appears.
It clears all calibration values stored in the internal
memory.
Under normal use the key will not be activated unless
pressed and held for 2 seconds to prevent accidental
erasing stored memory.
When the “Clear” key is pressed, all segments of the
LCD will be on. After about 2 seconds the unit will
enter the pH-AUTO mode. The “AUTO” and “CAL”
will be on and one of the buffer in the pre-selected
buffer set will start to flash. This means that the unit
must be calibrated again before use.
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Up/Down-
The two keys are used to manually enter the
temperature values. They have no effect on the unit
when operating in ATC mode.
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Stand/Slope-
The “Stand” and “Slope” keys are used for pH
calibration of the unit. Pressing and holding the
Stand
key while turning on the power, will change
the buffer set.
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Mea. / Eff.-
The key is used to bring the unit out of the AUTO
condition when operating in the pH-AUTOLOCK or
mV-AUTOLOCK mode.
Press and hold this key for 5 seconds, the LCD will
display the efficiency of the electrode.
OPERATIONAL PROCEDURES
A. Buffer Set Selection
The pH6715/6175-3C meter has two buffer sets: 7.00, 4.01,10.01pH
and 6.86, 4.00, 9.18pH. The meter is factory pre-set at 6.86, 4.00
and 9.18pH.
To change the buffer set, turn off the unit, then press and hold the
“Stand” key while turning on the unit again.
[
Note:
There is no need to repeat this procedure every time the unit
is power up unless one decides to change the buffer settings.]
