Hanna Instruments HI98127, HI98128 - Waterproof pH Tester Manual

Please read this instruction manual carefully before using the instrument.

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For technical support, contact your local Hanna Instruments Office or email us at tech@hannainst.com

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Operational Guide

To turn the meter on and check the battery status

Press and hold the /MODE button until the LCD lights up. All the used segments on the LCD will be visible for 1 second (or as long as the button is pressed), followed by the percent indication of the remaining battery life (E.g. "% 100 BATT").

Taking measurements

Submerge the electrode in the solution to be tested while stirring it gently. The measurements should be taken when the stability symbol on the top left of the LCD disappears. The pH value automatically compensated for temperature is shown on the primary LCD while the secondary LCD shows the temperature of the sample.

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 5.78 HOLD"). Press any button to return to normal mode.

To turn the meter off

While in normal mode, press the /MODE button. "OFF" will appear on the secondary display. Release the button.

Notes: Before taking any measurements make sure the meter has been calibrated ("CAL" tag present on the LCD). If measurements are taken in different samples successively, rinse the probe thoroughly to eliminate cross-contamination and after cleaning, rinse the probe with some of the sample to be measured.

Setup

Setup mode allows the selection of temperature unit and pH buffer set. To enter the Setup mode, press the /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 the /MODE button to enter the buffer set selection mode; press the /MODE button 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 pH 4.01 / 7.01 / 10.01) or "pH 6.86 BUFF" (for NIST 4.01 / 6.86 / 9.18). Change the set with the SET/HOLD button, then press /MODE to return to normal measuring mode.

pH Electrode Maintenance

• When not in use, rinse the electrode with water to minimize contamination and store it with a few drops of HI70300 storage solution in the protective cap.
  DO NOT USE DISTILLED OR DEIONIZED WATER FOR STORAGE PURPOSES.
• If the electrode has been left dry, soak in storage 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 HI7061 cleaning solution for half an hour. Afterwards, rinse it thoroughly with tap water and recalibrate the meter.

The pH electrode can be easily replaced by using the supplied tool (HI73128).

Insert the tool into the electrode cavity as shown above.

Rotate the electrode counterclockwise.

Pull the electrode out by using the other side of the tool. Insert a new pH electrode following the above instructions in reverse order.

Battery Replacement

The meter displays the remaining battery percentage every time it is switched on. When the battery level is below 5%, the symbol on the bottom left of the LCD lights up to indicate a low battery condition. The batteries should be replaced soon. If the battery level is low enough to cause erroneous readings, the meter shows "% 0 BATT" and the Battery Error Prevention System (BEPS) will automatically turn the meter off. To change the batteries, remove the 4 screws located on the top of the meter (fig. 1).

Once the top has been removed, carefully replace the 4 batteries located in the compartment while paying attention to their polarity (fig. 2).

Replace the top, making sure that the gasket is properly seated in place, and tighten the screws to ensure a watertight seal.

Note: Batteries should only be replaced in a safe area using the battery type specified in this instruction manual. Old batteries should be disposed in accordance with local regulations.

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, contact your local Hanna Instruments Office.

Each meter is supplied with:

• HI73127 pH electrode
• HI73128 electrode removal tool
• 1.5V batteries (4 pcs.)
• Instruction manual
• Calibration card

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

HI98127 (pHep^®4) and HI98128 (pHep^®5) are waterproof pH and temperature meters. The housing has been completely sealed against humidity and designed to float. All pH readings are automatically temperature compensated (ATC), and temperature values can be displayed in °C or °F units.

These meters can be calibrated at one or two points with auto-buffer recognition and against five memorized buffer values. A stability indicator is displayed on the LCD to ensure measurements are highly accurate.

At start-up, these meters indicate battery level and will display a low battery symbol to alert the user if the batteries need to be replaced. In addition, the Battery Error Prevention System (BEPS) avoids erroneous readings by turning the meter off when battery voltage levels are too low.

The included HI73127 pH electrode can be easily replaced and the stainless steel encapsulated temperature sensor facilitates faster and more accurate temperature measurement and compensation.

Functional Description

LCD Description

1. ATC (Automatic Temperature Compensation) indicator
2. Stability indicator
3. Battery life percentage indicator
4. Low battery indicator
5. Secondary display
6. Primary display
7. Measuring unit for primary display

Hanna Instruments reserves the right to modify the design, construction, or appearance of its products without advance notice.

All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments Inc., Woonsocket, Rhode Island, 02895, USA.

Specifications

Calibration

For better accuracy, frequent calibration of the instrument is recommended. In addition, the instrument must be recalibrated whenever:

1. The pH electrode is replaced.
2. After testing aggressive chemicals.
3. Where high accuracy is required.
4. At least once a month.

Calibration procedure

From normal measuring mode, press and hold the /MODE button until "OFF" on the secondary LCD 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 it replaces it with "WRNG", indicating 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 displays the accepted buffer, with the message "OK 1". After 1 second the meter automatically returns to the normal measuring mode. If a single-point calibration with buffer pH 7.01 (or pH 6.86) is desired, then after the calibration point has been accepted the /MODE button must be pressed in order to return to normal mode. After the button is pressed, the meter shows "7.01" (or "6.86") - "OK 1" and, after 1 second, it automatically returns to the normal measuring mode.

Note: A two-point calibration is recommended for better accuracy.

For a two-point calibration, place the electrode in pH 7.01 (or pH 6.86) buffer. After the first 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, 9.18 or 10.01) 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, and then the meter returns to the normal measuring mode.

Note: When the calibration procedure is completed, the "CAL" tag is turned on.

To quit calibration and reset to 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 /MODE button. The secondary LCD displays "ESC" for 1 second and the meter returns to the normal measuring mode.
• To 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.

Recommendations for Users

Before using Hanna Instruments products, make sure that they are entirely suitable for your specific application and for the environment in which they are used. Any variation introduced by the user to the supplied equipment may degrade the meter' s performance. Avoid touching the electrode area. To avoid damages or burns, do not put the meter in microwave oven. For yours and the meter's safety do not use or store the meter in hazardous environments.

Accessories

Electrode

pH Buffer Solution

Electrode Cleaning Solution

Electrode Storage Solution

Other Accessories

Warranty

HI98127 and HI98128 are warranted for a period of one year against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. The electrode is warranted for a period of six months. This warranty is limited to repair or replacement free of charge. Damage due to accidents, misuse, tampering or lack of prescribed maintenance is not covered. If service is required, contact your local Hanna Instruments Office. 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 (RGA) number from the Technical Service department and then send it with shipping costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection.

IST98127 06/18