31
30
• 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 is not immersed in the
solution.
• 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
into a pH 7.01 buffer solution; stir gen-
tly and wait a couple of minutes for
thermal equilibrium.
Note:
the electrode should be submerged
approximately 4 cm (1½") into the
solution.
• When electrode has stabilized, the sta-
bility indicator "
∆
" stops flashing.
• Press CFM to confirm the first buffer solution.
ins
e
rum
n
s
ON
O
FF
C
A
L
CFM
H
I
9
2
1
4
s
tic
k
p
H
m
e
te
r
HI 7004
ON
OFF
CAL
∆
∆
CFM
∆
HI 7007
4 cm
(1
½
")
CFM
PROCEDURE FOR HI 9214:
• Turn the meter on.
Note
: the stability indicator "
∆
" blinks when
the electrode is not immersed in the
solution.
• Remove the protective cap from the pH/°C
electrode, rinse the tip of the electrode
with some pH 7.01 solution, then immerse
it into a pH 7.01 buffer solution; stir
gently and wait a couple of minutes for
the reading to stabilize.
Note:
the electrode should be submerged
approximately 4 cm (1½") into the
solution.
• Press CAL. The display will flash "7.01
∆
".
• Wait until the stability indicator "
∆
" stops
flashing.
• Press CFM to confirm the first buffer solu-
tion.
• If the ON/OFF key is pressed at this point, the calibration process
will end with only the offset (one-point) calibration. For best
accuracy, however, it is recommended that two-point calibration
is performed.
• The LCD will now flash "4.01
∆
". If the
CAL key is pressed, the slope calibration
will change to "10.01
∆
".
ON
OFF
ins
e
rum
n
s
O
N
O
FF
C
A
L
CFM
H
I
9
2
1
4
s
tic
k
p
H
m
e
te
r
HI 7007
4 cm
(1
½
")
ins
e
rum
n
s
ON
OFF
C
A
L
C
F
M
H
I
9
2
1
4
s
tic
k
p
H
m
e
te
r
CAL
∆
∆
CFM
∆
