YOKOGAWA PH72, Руководство пользователя

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IM 12B03D02-01E
5-3
5 . Keypad and Display Functions
(1) Battery condition indicator
Indicates the level of the remaining battery life stepwise. means that
there is plenty of life left. A flashing means that the batteries are low
and need to be replaced immediately. When the indicator is flashing, access to
calibration mode by pressing
CAL
key is rejected. To replace the batteries,
first press
POWER
key to turn off power and make sure the display has been
turned off, and then replace referring to Section 2.1, “Installing the Batteries.”
(2) Temperature setting mode
Appears while manual temperature setting is being performed (refer to Section
5.3 (2), “Manual temperature setting (M.tp) panel”).
(3) Manual mode
Appears when a sensor without a built-in temperature element (needle type or
test tube size pH sensor) is connected to the meter (refer to Section 2.6, “Manual
temperature setting”).
(4) Data mode
Appears when measured data are stored or when stored data are accessed
(refer to Section 5.1, “Keypad Functions,” and Section 5.3 (1), “Display stored
data (dAt) panel”).
(5) HOLD mode
Appears while measured data are being held temporarily (refer to Section 5.1,
“Keypad Functions”).
(6) Calibration mode
Appears during calibration using standard solutions (refer to Chapter 4,
“Calibration”).
(7) Sensor check mode
This mark may appear when:
• the pH electrode deteriorated significantly (check is performed during
calibration);
• the standard solution used for calibration changed in quality;
• deposits are present on the electrode (check is performed during calibration).
If deposits are present, clean the sensor (see Section 6.2); or,
• calibration is performed improperly.
If you performed an incorrect calibration procedure, initialize the calibration
parameters and calibrate the PH71 again (see Section 7.4).