EUTECH INSTRUMENTS ALPHA PH 800 PHORP CONTROLLERTRANSMITTER, Руководство по эксплуатации

Страница: 15 / 34

11
6 CALIBRATION
Direct Calibration from the Measurement mode is possible via the CAL key.
The Calibration procedure can also be accessed from the Advanced Setup
mode.
6.1 pH Calibration
This unit features five preset buffer values (1.00, 4.00, 6.86 or 7.00, 9.00,
9.18 and 10.00) for quick, two-point auto calibration. When calibrating this
instrument, standard pH buffer solutions must be used.
1) Enter Calibration mode . While in the
Measurement mode, push the CAL key. The upper
and lower display reads “CAL” & “pH”. Push the
ENTER or CAL key again. The controller displays
the electrode status based on the previous
calibration. Electrode slope and offset information is
displayed.
NOTE: If the display reads “CAL OrP”, see section
7.4 for procedures on how to switch from ORP to pH
readings.
2) Press the ENTER key again to begin
calibration. The “CAL” indicator appears at the top of
display and the buffer indicator appears in the bottom
left corner of the display. The upper display is the on-
line pH value as measured by the electrode. The
lower display indicates the first compulsory
calibration value, pH 7.00 (or 6.86).
3) Immerse the clean electrode in the buffer solution.
In ATC, the temperature probe must also be
immersed in the buffer solution. Likewise for
HOLD
6.96
pH
7.00
pH
CAL
4.02
pH
4.00
pH
SETUP
HOLD
CAL
59.0
mV
7.00
pH
READY
HOLD
CAL
CAL
PH
SETUP
HOLD
57.2
mV
6.88
pH
READY
HOLD
CAL