Hanna Instruments HI 99141 User Manual
Instruction Manual
HI 99141
Portable Waterproof
pH Meter for Cooling Towers
www.hannainst.com
WARRANTY
All Hanna Instruments meters are warranted
for two years against defects in workmanship
and materials when used for their intended purpose and maintained according to instructions. The
probes are warranted for a period of 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 problem. 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.
This Instrument is in Compliance
with the CE Directives
Dear Customer,
Thank you for choosing a Hanna Instruments
Product.
Please read this instruction manual carefully
before using the instrument. This manual will
provide you with all the necessary information for the correct use of the instrument, as
well as a precise idea of its versatility in a
wide range of applications.
This instrument is in compliance with the
directives.
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully to make sure
that no damage has occurred during shipment. If noticeable damage is evident, notify
your dealer.
Note: Save all packing material until you
are sure that the instrument functions
correctly. All defective items must be
returned in the original packing together with the supplied accessories.
GENERAL DESCRIPTION
HI 99141 is a portable, microprocessor-
based pH and temperature meter with a
special probe.
HI 72911 is a rugged double junction pH
electrode with a flat tip and stainless-steel
body that also functions as a matching pin.
The electrode has an annula PTFE junction
for maximum surface contact and the
flat tip is easy to clean and prevents solids
in solution from collecting on the sensor.
Moreover, a built-in temperature sensor allows simultaneous pH and temperature
readings and a mini amplifier renders measurements impervious to noise and electrical interferences.
Each meter comes with:
• HI 72911 pH/temperature probe
• 3x1.5V AA alkaline batteries
• instruction manual
• plastic carrying case
LCD DESCRIPTION
1. Automatic Temperature Compensation
indicator
2. Stability indicator
3. Battery percentage
4. pH calibration indicator
5. Low battery indicator
6. Selectable temperature unit
7. Secondary display
8. Primary display
9. Measuring unit for primary display
ACCESSORIES
HI 72911 Combination amplified pH elec-
trode with built-in temperature
sensor, flat tip and stainlesssteel body
HI 7004L pH 4.01 buffer solution, 500 mL
HI 7006L pH 6.86 buffer solution, 500 mL
HI 7007L pH 7.01 buffer solution, 500 mL
HI 7009L pH 9.18 buffer solution, 500 mL
HI 7010L pH 10.01 buffer solution, 500 mL
HI 70300L Storage solution, 460 mL
HI 7061L Cleaning solution, 460 mL
HI 70670 Cleaning solution for salt depos-
its on electrodes, available in 20
mL sachet (25 pcs.), 230 mL and
460 mL bottle
HI 70671 Cleaning & disinfection solution
for algae, fungi & bacteria, available in 20 mL sachet (25 pcs.),
230 mL and 460 mL bottle
HI 721312 Hard carrying case
HI 710007 Blue shockproof rubber boot
HI 76405 Electrode holder
SPECIFICATIONS
Range -2.00 to 16.00 pH
-5.0 to 105.0°C / 23.0 to 221.0°F
Resolution 0.01 pH
0.1°C / 0.1°F
Accuracy ±0.02 pH
(@20°C/68°F) ±0.5°C up to 60°C; ±1°C outside
±1°F up to 140°F; ±2°F outside
Typical EMC ±0.02 pH
Deviation ±0.2°C or ±0.4°F
Temperature Automatic
Compensation
pH Calibration Automatic, 1 or 2 point
with 2 sets of standardized buffers
(4.01/7.01/10.01 or 4.01/6.86/9.18)
(included) HI 72911
Probe
amplified pH-electrode with built-in tempera-
ture sensor and matching pin
Battery Ty pe 3 x 1.5V AA / IEC LR6
Battery Life approx. 1500 hours
Auto-off after 8 minutes of nonuse
Environment 0 to 50°C (32 to 122°F);
RH 100%
Dimensions 150x80x38 mm (5.9x3.2x1.5”)
Weight 245 g (8.6 oz.)
To clean the meter, it is recommended to use water.
Hanna Instruments reserves the right to modify
the design, construction and appearance of its
products without advance notice.
ISTR99141R2 06/03
OPERATIONAL GUIDE METER SETUPpH MEASUREMENT & CALIBRATION
To connect the probe
With the meter turned off, connect the HI 72911
probe to the DIN socket on the top of the meter by
aligning the pins and pushing in the plug. Tighten
the nut to ensure a good connection. Remove the
protective cap from the probe before taking any
measurements.
To turn the meter ON and check the battery
status
Press the ON/OFF/MODE button until the display
lights up. At start-up, all the LCD segments are
displayed for 1 second, then the percent indication of the remaining battery life is shown for another second (E.g. % 100 BA TT). The meter then
enters the normal measuring mode.
Note: If the display needs to be checked, keep the
ON button pressed while turning the meter on.
The meter will display all segments as long as
the button is pressed.
To freeze the display
While in measurement mode, press the SET/
HOLD button, HOLD appears on the secondary
display and the reading will be frozen on the LCD
(E.g. pH 5.73 HOLD). Press any button to return to
normal mode.
To turn the meter OFF
While in normal measurement mode, press the
ON/OFF/MODE button. OFF will appear on the
secondary display. Release the button.
Note: The meter is provided with an acoustic sig-
nal feature which can be disabled using the
switch located in the battery compartment.
Note: When the meter detects the absence of a
temperature probe at its input, the Automatic
Temperature Compensation is turned off, and
the meter uses a default value of 25°C (77°F)
for the temperature measurement and compensation. In this condition, the secondary LCD
shows 25.0°C (77.0°F) blinking. When a probe
is connected, the meter automatically returns
to the ATC mode, the ATC t ag is turned on, and
the temperature is shown on the secondary
display .
• Make sure the meter has been calibrated before use.
• If the probe is dry, soak it in HI 70300 storage
solution for one hour to reactivate it.
• Place the tip of the probe into the sample to be
tested.
• Stir briefly and wait until the symbol on the top
left of the LCD is turned off.
• The LCD shows the pH value (automatically
compensated for temperature) on the primary
LCD, while the secondary LCD shows the temperature of the solution.
• If measurements are taken in different samples
successively, rinse the probe tip thoroughly to
eliminate cross-contamination. After cleaning,
rinse the probe tip with some of the sample to
be measured.
pH calibration
For better accuracy, frequent calibration of the
instrument is recommended. In addition, the
instrument must be recalibrated whenever:
a) The pH electrode is replaced.
b) After testing aggressive chemicals.
c) Where high accuracy is required.
d) At least once a month.
• From normal mode, press and hold the ON/
OFF/MODE button until OFF on the secondary
display is replaced by CAL. Release the button.
• The LCD enters the calibration mode, displaying “pH 7.01 USE” (or “pH 6.86 USE” if the NIST
buffer set was selected). After 1 second the meter
activates the automatic buffer recognition feature. If a valid buffer is detected, then its value is
shown on the primary display, and REC appears on the secondary LCD. If no valid buffer is
detected, the meter keeps the USE indication
active for 12 seconds, and then replaces it with
WRNG, indicating that the sample being measured is not a valid buffer.
• For a single-point calibration with buffers pH
4.01, 9.18 or 10.01, the meter automatically accepts the calibration when the reading is stable;
the meter will show on the primary display the
accepted buffer, with the message “OK 1” on
the secondary display, and an audible signal is
produced. After 1 second the meter automatically returns to the normal measuring mode.
If a single-point calibration with buffers pH 7.01
or 6.86 is desired, then after the calibration point
has been accepted the ON/OFF/MODE button
must be pressed in order to return to the normal measuring mode. After the button is
pressed, the meter shows "7.01" (or "6.86") "OK 1", and an audible signal is produced. After
1 second, the meter automatically returns to
the normal measuring mode.
Note: It is always recommended to carry out a
two-point calibration for better accuracy.
• For a
two-point calibration, place the probe in
pH 7.01 (or pH 6.86) buffer . After the calibration
point has been accepted, the “pH 4.01 USE”
message appears. The message is held for
12 seconds, unless a valid buffer is recognized.
If no valid buffer is recognized, then the WRNG
message is shown. If a valid buffer (pH 4.01,
pH 10.01 or pH 9.18) is detected, then the meter
completes the calibration procedure. When the
buffer is accepted, the LCD shows the accepted
value with the “OK 2” message on the secondary display. The meter then returns to the normal measuring mode.
Note: When the calibration procedure is com-
pleted, the CAL tag is turned on.
To quit calibration and to reset to the default values
• After entering the calibration mode and before
the first point is accepted, it is possible to quit
the procedure and return to the last calibration
data by pressing the ON/OFF/MODE button. The
secondary LCD displays ESC for 1 second and
the meter returns to normal mode.
• T o reset to the default values and clear a previous calibration, press the SET/HOLD button
after entering the calibration mode and before
the first point is accepted.
The secondary LCD displays CLR for 1 second, the meter resets to the default calibration
and the “CAL” tag on the LCD disappears.
Setup mode allows the selection of the temperature unit and of the pH buffer set.
T o enter the Setup mode, press and hold the ON/
OFF/MODE button until CAL on the secondary display is replaced by TEMP and the current temperature unit (E.g. TEMP °C). Then:
• for °C/°F selection, use the SET/HOLD button.
After the temperature unit has been selected,
press ON/OFF/MODE to enter the buffer set
selection mode; press ON/OFF/MODE twice to
return to the normal measuring mode.
• to change the calibration buffer set, after setting the temperature unit, the meter will show
the current buffer set: “pH 7.01 BUFF” (for 4.01/
7.01/10.01) or “pH 6.86 BUFF” (for 4.01/6.86/
9.18). Change the set with the SET/HOLD button, then press ON/OFF/MODE to return to normal mode.
BATTERY REPLACEMENT
The meter displays the remaining battery percentage when turned on. When the level is
below 5%, the
of the LCD blinks to indicate a low battery condition. If the battery level is low enough to
cause erroneous readings, the Battery Error
Prevention System (BEPS) turns the meter
off.
Unscrew the 4 screws located on the back of
the meter and carefully replace the 3 AA batteries located in the battery compartment,
while paying attention to their polarity. Reattach the back making sure that the gasket is
in place and tighten the 4 screws to ensure a
watertight seal.
- +
symbol on the bottom left
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