Hanna Instruments HI 981400 - Manual (Page 2)

TAKING pH MEASUREMENTS
• Turn the meter on by connecting the 12 Vdc power
adapter to the meter and the mains.
• Connect a pH electrode to the indicator.
• Remove the protective cap from the pH electrode and
immerse the tip (4 cm/1½”) in the sample.
• Allow the reading to stabilize.
ADJUSTING THE SETPOINT
You can select the setpoint value in the 4.6 to 7.5 pH
range. A visual indication (red LED) will alert you when the
measured pH exceeds the set value.
• To access the MEASURE/SET switch and the setpoint
adjustment trimmer, remove the rear panel.
• Move the switch upwards to visualize the setpoint.
• With a small screwdriver
adjust the setpoint trimmer
to display the desired value.
The setpoint is factory set at
5.5 pH.
• Move the switch back downwards to return to the
measurement mode.
• Close the meter while making sure the gasket is in place
before tightening the screws.
• Whenever the pH reading
exceeds setpoint, the alarm
LED blinks to warn the user.
For better accuracy, frequent calibration of the instrument is
recommended. In addition, the instrument must be recali-
brated whenever:
a) The pH electrode is replaced
b) After testing aggressive samples
c) Where higher accuracy is required
d) At least once a month
e) When the electrode has been used for a long time
PREPARATION
Pour small quantities of pH 7.0 (HI 7007) and pH 4.0
(HI 7004) solutions into two clean beakers.
For accurate calibration use two beakers for each buffer
solution, the first one for rinsing the tip of the electrode and
the second one for calibration.
A complete range of Hanna buffer solutions in single-use
sachets is available for a more hygienic calibration.
CALIBRATION PROCEDURE
• Turn the meter on and make sure that the MEASURE/SET
switch is on the MEASURE mode.
• Remove the protective cap from
the electrode, rinse and im-
merse it in pH 7.0 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”) in the solu-
tion.
• With the supplied calibration screwdriver, adjust the
“pH 7” trimmer until the dispaly shows “pH 7.0”.
CALIBRATION
• Rinse and immerse the electrode in pH 4.0 (or pH 10)
solution (second calibration point) and stir gently.
• Wait a couple of minutes, then adjust the “pH 4”
trimmer until the display shows the “pH 4.0” (or “pH
10.0”).
The pH calibration is now complete.
4 cm (1½")
7.0
FOOD STABILITY
p H
I N D I C ATO R
HACCP
pH
pH4 pH7
Recommendations for Users
Before using this product, make sure that it is entirely suitable for the
environment in which it is used. Operation of this instrument in residential
areas could cause unacceptable interference to radio and TV equipment.
The glass bulb at the end of the electrode is sensitive to electrostatic discharge.
Avoid touching this glass bulb at all times. During operation, ESD wrist straps
should be worn to avoid possible damage to the electrode by electrostatic
discharge.
Any variation introduced by the user to the supplied equipment may degrade
the instrument’s EMC performance.
To avoid electrical shock, do not use this instrument when voltage at the
measurement surface exceeds 24 Vac or 60 Vdc.
To avoid damage or burns, do not perform any measurement in microwave
ovens.
ACCESSORIES
FC 200B Conic, open junction pH electrode
FC 230B pH electrode with optional blade
FC 098 Stainless steel blade, 20 mm (0.8”)
FC 099 Stainless steel blade, 35 mm (1.4”)
HI 70004P pH 4.01 solution, 20 mL sachet (25 pcs)
HI 70007P pH 7.01 solution, 20 mL sachet (25 pcs)
HI 70010P pH 10.01 solution, 20 mL sachet (25 pcs)
HI 7004M pH 4.01 solution, 230 mL bottle
HI 7007M pH 7.01 solution, 230 mL bottle
HI 7007M pH 7.01 solution, 230 mL bottle
HI 70300M Electrode storage solution, 230 mL bottle
HI 7061M
Electrode cleaning solution, 230 mL bottle
HI 710005 12 Vdc power adapter, US plug
HI 710006 12 Vdc power adapter, European plug
SET
MEAS
5.8
FOOD STABILITY
p H
I N D I C ATO R
HACCP
pH
pH4 pH7
w w w . h a n n a i n s t . c o m
IST981400R3 05/05
SET
MEAS
HI 7007
RINSE
HI 7007
CALIBRATION