Hanna Instruments HI 981402C - Manual (Page 2)

TAKING MEASUREMENTS
• Turn the meter on by connecting the supplied 12 Vdc
power adapter to the meter and to the mains.
• Remove the protective cap from the pH electrode and
immerse the tip (approx. 4 cm/1½”) in the sample,
together with the matching pin.
• The LCD will show the pH value. Allow the reading to stabilize
and the instrument will start continuous monitoring.
Note: To prevent damages to the electrode, remove the pH
electrode from the sample before turning the meter off.
ADJUSTING THE SETPOINT
(factory setting = 6.1 pH)
The meter allows the user to select the setpoint value for alarm
and power output activation.
• To access the MEAS/SET switch and the setpoint adjustment
trimmer, unscrew the 4 screws located on the back of the
meter and remove the rear panel.
• Move the switch to the SET position.
• With the supplied screwdriver adjust the setpoint trimmer
to display the desired value in the range 5 to 8 pH.
• Move back the switch to the MEAS position.
• Reattach the back making sure that the gasket is in place
before tightening the 4 screws.
• Whenever the pH reading exceeds
the selected setpoint value, the red
alarm LED blinks and the power
contact output is activated for
driving an external magnetvalve,
and thus triggering the CO
2
dos-
ing system.
C A L I B R A T I O N
For For the greatest accuracy, it is recommended to calibrate
the instrument at least once a month. Calibration should also
be performed after replacing the pH electrode.
• 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 electrode tip and the
second one for calibration.
• Turn the meter on and make sure that the MEAS/SET
switch is on MEAS position.
• Remove the protective cap, rinse and immerse the electrode
in pH 7.0 buffer solution, together with the matching pin.
Stir gently and wait for the reading to stabilize.
Note: The electrode should be submerged approximately 4 cm
(1½”) in the solution.
• First adjust the “pH 7” trimmer with the supplied screw-
driver until the LCD shows “pH 7.0”.
• Rinse pH electrode and matching pin, immerse them in the
pH 4.0 buffer solution and stir gently.
• Then wait a couple of minutes and adjust the “pH 4”
trimmer until the LCD shows “pH 4.0”.
The pH calibration is now complete.
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 interfer-
ences to radio and TV equipment.
The glass bulb at the end of the electrode is sensitive to electrostatic discharges. 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 discharges.
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 voltages at the measurement surface
exceed 24 Vac or 60 Vdc. To avoid damages or burns, do not perform any measurement in
microwave ovens.
A C C E S S O R I E S
HI 1230B/2C Double junction, plastic body, gel-filled pH elec-
trode with BNC connector, protective sheath and
2 m (6.6’) cable
HI 1283 (*) Matching pin with 2 m (6.6’) cable
HI 70004P pH 4.01 solution, 20 mL sachet (25 pcs)
HI 70007P pH 7.01 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 7004L pH 4.01 solution, 500 mL bottle
HI 7007L pH 7.01 solution, 500 mL bottle
HI 70300M Electrode storage solution, 230 mL bottle
HI 70300L Electrode storage solution, 500 mL bottle
HI 7061M Electrode cleaning solution, 230 mL bottle
HI 7061L Electrode cleaning solution, 500 mL bottle
HI 710005 12 Vdc power adapter, US plug
HI 710006 12 Vdc power adapter, European plug
HI 710012 12 Vdc power adapter, Australian plug
HI 710013 12 Vdc power adapter, South African plug
HI 710014 12 Vdc power adapter, UK plug
HI 710005/8 12 Vdc/800 mA power adapter, US plug
HI 710006/8 12 Vdc/800 mA power adapter, European plug
HI 731326 Calibration screwdriver (20 pcs)
(*) To be substituted by authorized technical personnel only.
IST981402C 04/05
CE DECLARATION OF CONFORMITY