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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