Hanna Instruments HI 991401-01 User Manual
Instruction Manual
(HI 991401)
www.hannainst.com
Dear Customer,
Thank you for choosing a Hanna product.
This manual will provide you with the necessary information
for a correct operation. Please read it carefully before using
the meter. If you need additional technical information, do
not hesitate to e-mail us at tech@hannainst.com.
This instrument is in compliance with the directives.
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully. If any damage has occurred during shipment,
immediately notify your dealer or the nearest Hanna Customer
Service Center.
The meter is supplied with:
• HI 1293D pH-electrode
• temperature probe (fixed)
• pH 4.01 and pH 7.01 buffer solutions (20 mL each)
• 12 Vdc power adapter and instructions
Note: Conserve all packing material until the instrument has
been observed to function correctly. Any defective item
must be returned in its original packing.
FUNCTIONAL DESCRIPTION SPECIFICATIONS
Range 0.0 to 14.0 pH
0.0 to 60ºC / 32.0 to 140ºF
Resolution 0.1 pH / 0.1ºC / 0.1ºF
Accuracy (@20ºC/68ºF) ±0.1 pH / ±0.5 ºC / ±1ºF
Typical EMC Deviation
±0.1 pH / ±1ºC / ±2 ºF
pH Calibration Automatic, 1 or 2 point
with auto-buffer recognition
Temperature Compensation Automatic
Probes HI 1293D pH electrode (included)
HI 1294 temperature probe (fixed)
Power supply 12 Vdc power adapter (included)
Environment 0 to 50ºC (32 to 122ºF);
RH max 95% non-condensing
Dimensions 160 x 105 x 31 mm (6.2 x 4.1 x 1.2’’)
Weight 190 g (6.7 oz.)
WARRANTY
HI 991401 is warranted for two years against defects in workmanship
and materials when used for their intended purpose and maintained according to instructions. Electrodes and probes are warranted for six months.
This warranty is limited to repair or replacement free of charge.
Damages due to accident, misuse, tampering or lack of prescribed maintenance are not covered.
If service is required, contact the dealer from whom you purchased the instrument. If under warranty, report the model number, date of purchase, serial
number and the nature of the failure. If the repair is not covered by the
warranty, you will be notified of the charges incurred. If the instrument is to be
returned to Hanna Instruments, first obtain a Returned Goods Authorization
Number from the Customer Service department and then send it with shipment costs prepaid. When shipping any instrument, make sure it is properly
packaged for complete protection.
All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner.
Hanna Instruments reserves the right to modify the design, construction and
appearance of its products without advance notice.
GENERAL DESCRIPTION
HI 991401 indicator features a large, dual-level backlit LCD
to give istantaneous readings of both pH and temperature,
even from a distance.
This waterproof indicator has been specially designed to meet
the grower’s need for equipment suited to the aggressive
environments of agricultural and hydroponics applications.
Measurements are highly accurate and the meter can be
calibrated at one or two points. Low battery and battery
changes are no longer a problem thanks to a 12 Vdc power
supply included with the meter.
The HI 1293D pH electrode & the temperature probe have
been molded with pipe thread (1/2’’ NPT), which allows the
user to attach them to an in-line system.
Moreover, the pH electrode has been specially designed to
guarantee greater clogging resistance in fertilizer solutions
with high concentrations of phosphate and nitrate.
1. Liquid Crystal Display
2. ON/OFF/MODE button
3. Power supply connector
4. 12 Vdc power adapter
5. HI 1293D pH electrode with differential input and pipe
thread 1/2’’ NPT
6. Temperature probe with pipe thread 1/2’’ NPT
(also working as matching pin for pH electrode)
7. DIN connector
8. SET/HOLD button
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 interferences 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.
IST991401R2 07/05
OPERATIONAL GUIDE
pH CALIBRATION
Preliminary operations
Connect the pH electrode to the meter.
Connect the 12 Vdc adapter to the meter and to the mains;
the display will lit.
Press and hold the MODE button for 2-3 seconds. All the used
segments on the LCD will be visible for a few seconds.
To change the temperature unit
To change the temperature unit (from °C to °F), from
measurement mode, press and hold the MODE button until
“TEMP” and the current temperature unit are displayed on
the lower LCD (E.g. TEMP °C).
Use the SET/HOLD button to change the temperature unit,
and then press MODE button twice to return to normal
measurement mode.
To freeze the display
Press and hold the SET/HOLD button for 2-3 seconds, until
“HOLD” appears on the secondary display.
Press either button to return to normal mode.
Taking measurements
Immerse the electrode and the temperature probe in the solution to be
tested. For better accuracy, the electrode should not touch or stand close to
the walls or bottom of the sample
vessel.
The pH value automatically compensated for temperature is shown on the primary LCD, while the
secondary LCD displays the temperature of the sample.
Measurements should be taken when the stability symbol
on the top left of the LCD disappears.
IMPORTANT NOTE
Measurements have to be taken with both pH electrode and temperature probe (also working as
matching pin) immersed in the same vessel.
To turn the meter off
Press the MODE button while in normal measurement mode.
“OFF” will appear on the lower part of the display. Release
the button. The display still lit, until the power supply is
connected.
Notes:
• Before taking any measurement make sure the meter has
been calibrated.
• To clear a previous calibration, press the MODE button
after entering the calibration mode. The lower LCD will
display “ESC” for 1 second and the meter will return to
normal measurement mode. The “CAL” symbol on the LCD
will disappear. The meter will be reset to the default
calibration.
• If measurements are taken in different samples successively,
rinse the electrode thoroughly with water, and then with
some of the sample to be measured.
pH ELECTRODE MAINTENANCE
• When not in use, rinse the electrode with water and store
it with a few drops of HI 70300 storage solution in the
protective cap.
NEVER DISTILLED OR DEIONIZED WATER FOR STORAGE
PURPOSES.
• If the electrode has been left dry, soak in storage or pH 7
solution for at least one hour to reactivate it.
• To prolong the life of the pH electrode, it is recommended
to clean it monthly by immersing it in the HI 7061
cleaning solution for half an hour. Afterwards, rinse it
thoroughly with tap water and recalibrate the meter.
Calibration buffer set
• From measurement mode, press and hold the MODE
button until “TEMP” and the current temperature unit are
displayed on the lower LCD (E.g. TEMP °C).
• Press the MODE button again to show the current buffer set:
“pH 7.01 BUFF” for standard set (pH 4.01/7.01/10.01) or
“pH 6.86 BUFF” for NIST set (pH 4.01/6.86/9.18).
• Press the SET/HOLD button to change the buffer value.
• Press the MODE button to return to the normal mode.
Calibration procedure
From measurement mode, press and hold the MODE button
until “CAL” is displayed on the lower LCD. Release the button.
The LCD will display “pH 7.01 USE” (or “pH 6.86 USE” if you
have selected the NIST buffer set). The CAL tag blinks on the
display.
• For a single-point pH calibration, immerse the electrode
and the temperature probe in any buffer from the selected
buffer set (eg. pH 7.01 or pH 4.01 or pH 10.01). The
meter will recognize the buffer value automatically.
If using pH 4.01 or pH 10.01, the meter will display “OK”
for 1 second and then return to measurement mode.
If using pH 7.01, after recognition of the buffer the meter
will ask for pH 4.01 as second calibration point. Press the
MODE button to return to measurement mode or, if
desired, proceed with the 2 point calibration as explained
below.
Note: For better accuracy it is always recommended to carry
out a two-point calibration.
• For a two-point pH calibration, place the electrode and
the temperature probe in pH 7.01 buffer (or pH 6.86 if
you have selected the NIST buffer set). The meter will
recognize the buffer value and then display “pH 4.01
USE”.
Rinse the electrode thoroughly and immerse it in the
second buffer value (pH 4.01 or 10.01, or, if using NIST,
pH pH 4.01 or 9.18). When the second buffer is also
recognized, the LCD will display “OK” for 1 second and the
meter will return to the normal mode.
Note: For storing calibration data in the non-volatile memory,
turn the meter OFF and then ON again through the
MODE button.
The “CAL” symbol on the LCD means that the meter is
calibrated.
ACCESSORIES
HI 1293D Spare pH electrode with differential input,
pipe thread 1/2’’ NPT and DIN connector
HI 1294 (*) Temperature probe, pipe thread 1/2’’
NPT (also working as matching pin for the
pH electrode)
HI 70004P pH 4.01 solution, 20 mL sachet (25 pcs)
HI 70006P pH 6.86 solution, 20 mL sachet (25 pcs)
HI 70007P pH 7.01 solution, 20 mL sachet (25 pcs)
HI 70009P pH 9.18 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 7006M pH 6.86 solution, 230 mL bottle
HI 7007M pH 7.01 solution, 230 mL bottle
HI 7009M pH 9.18 solution, 230 mL bottle
HI 7010M pH 10.01 solution, 230 mL bottle
HI 7061M Electrode cleaning solution, 230 mL bottle
HI 70300M Electrode storage solution, 230 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 Africa plug
HI 710014 12 Vdc power adapter, UK plug
(*) To be replaced by authorized technical personnel only
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