User Guide

26
mometer), e.g. 20°C.
• Set the rotary knob to °C to display the
manual temperature setting.
• Adjust the °C trimmer until the LCD shows the measured tem-
perature.
• Set the rotary knob to pH to display pH
measurement and wait for the reading
to stabilize.
• Adjust the AP trimmer with a small screwdriver until the LCD
shows the pH value at the above temperature (see the pH versus
temperature chart on page 35).
• Rinse and immerse the pH electrode in
pH 4.01 or pH 10.01 buffer (2
nd
calibra-
tion point) and stir gently.
• Wait a couple of minutes and adjust the mV/pH trimmer until
the LCD shows the pH value at the noted temperature (see
page 35 for pH versus temperature chart).
The pH calibration is now complete.
PROCEDURE FOR HI 8314 & HI 8915
• Switch the meter on after connecting the
pH electrode and the temperature probe.
OFF
mV
°C
pH
°C
ºC
OFF
mV
°C
pH
A
P
pH
°
C
HI 7004
pH
mV/pH
ON
OFF
31
• Rinse the pH electrode with some pH 4.01
or 10.01 buffer solution (2
nd
calibration
point).
• Dip the electrode into the pH 4.01 (or
pH 10.01) buffer solution.
• Stir gently and wait until the stability
indicator "∆" stops flashing.
• Press CFM to confirm the acceptance of
the second buffer solution.
pH calibration is now complete and the meter
returns to the measurement mode.
PROCEDURE FOR HI 931000
• Turn the meter on.
Note: The stability indicator "∆" blinks when
the electrode reading is unstable.
• Press CAL and the display will flash
"7.01 ∆".
• Remove the protective cap from the elec-
trode, rinse the tip of the electrode with
some pH 7.01 solution, then immerse it
in a pH 7.01 buffer solution. Stir gently
and wait a couple of minutes for thermal
equilibrium.
Note: The electrode should be submerged
approximately 4 cm (1½") in the
solution.
• When electrode has stabilized, the sta-
bility indicator "∆" stops flashing.
• Press CFM to confirm the first buffer solution.
in
s
e
r
u
m
n
s
O
N
O
F
F
C
AL
C
F
M
HI 9214 stick pHmeter
HI 7004
ON
OFF
CAL
∆
∆
CFM
∆
HI 7007
4 cm
(1½
")
CFM