Dear Customer, Thank you for choosing a Hanna Instruments product. Please read this instruction manual carefully before using the tester. For more information about Hanna Instruments and our products, visit www.hannainst.com or e-mail us at [email protected]. For technical support, contact your local Hanna Instruments Office or e-mail us at [email protected]. Preliminary Examination Remove the tester and accessories from the packing material and examine it carefully. If you require any further information, please contact Hanna Instruments technical support team at [email protected]. Each HI98127 and HI98128 is delivered in a cardboard box and is supplied with: • HI70004 pH 4.01 buffer solution, 20 mL sachet (2 pcs.) • HI70007 pH 7.01 buffer solution, 20 mL sachet (2 pcs.) • HI700601 pH & ORP electrode cleaning solution, 20 mL sachet (1 pc.) • HI70300N Storage solution for pH & ORP electrodes, 20 mL sachet (1 pc.) • HI73127 pH electrode • HI73128 Electrode removal tool • 1.5V batteries (4 pcs.) • Instrument quality certificate • Instruction manual Note: Save all packing material until you are sure that the tester works correctly. Any damaged or defective item must be returned in its original packing material with the supplied accessories. Specifications -2.0 to 16.0 pH (HI98127) Range -2.00 to 16.00 pH (HI98128) -5.0 to 60.0 °C (23.0 to 140.0 °F) 0.1 pH (HI98127) Resolution 0.01 pH (HI98128) 0.1 °C (0.1 °F) ±0.1 pH (HI98127) Accuracy ±0.05 pH (HI98128) (@25 °C / 77 °F) ±0.5 °C (±1.0 °F) Temperature Automatic compensation Environment -5 to 50 °C (23 to 122 °F); RH 100% Automatic, one or two-point with two sets Calibration of standard buffers (pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18) Electrode HI73127 pH electrode (included) Battery type 1.5V (4 pcs.) Battery life Approx. 300 hours Auto-off After 8 minutes of non-use Dimensions 171 x 41 x 26 mm (6.7 x 1.6 x 1.0”) Weight 84 g (3.0 oz) Functional Description Battery compartment General Description & Intended Use HI98127 (pHep®4) and HI98128 (pHep®5) are compact pH and temperature testers. They feature a two-buttons operation system and are easy to use. The compact and waterproof casing is designed to float if accidentally dropped in water. The testers measure temperature in both °C and in °F. All pH measurements are temperature compensated automatically (ATC). The testers display a stability ( ) tag that will disappear once the reading has stabilized. Battery level and low-battery indicator are clearly displayed on the LCD to alert the user in the event that low battery power could adversely affect readings. BEPS (Battery Error Prevention System) Tester will automatically shut off if there is not enough power to get an accurate measurement. pH Probe: HI98127 & HI98128 are supplied together with HI73127 pH replaceable electrode with a stainless steel round connector and extendable cloth junction. This design has no pins to line up or that can break. Temperature Sensor: The stainless steel temperature sensor facilitates faster and more accurate temperature measurement. 1. Automatic Temperature Compensation (ATC) indicator 2. Stability tag 3. Battery life percentage indicator 4. Low battery indicator 5. Measurement unit 6. First LCD line 7. Second LCD line Operational Guide Turning the Tester ON / OFF Press and hold /MODE. All LCD segments will be displayed for a few seconds followed by battery life percentage indicator. To turn the tester off, from measurement mode, press /MODE. “OFF” will be displayed on the second LCD line and then the tester will turn off. HOLD Mode From measurement mode, press and hold SET/HOLD until “HOLD” is displayed. pH reading will be frozen on the LCD. Press either buttons to resume measurement mode. Liquid Crystal Display /MODE button SET/HOLD button Setup Setup mode allows the selection of temperature unit and pH buffer set. To enter the setup mode, select pH mode and press /MODE until “TEMP” and the current temperature unit are displayed (e.g. “TEMP °C”). Then: • Press SET/HOLD to select temperature unit. After the temperature unit has been selected, press /MODE to select the buffer set. To return to measurement mode, press /MODE twice. Temperature sensor • After setting the temperature unit, the tester will display the current buffer set: “pH7.01 BUFF” (for pH 4.01/7.01/10.01) or “pH6.86 BUFF” (for NIST pH 4.01/6.86/9.18). Press SET/ HOLD to change the buffer set and press /MODE to resume measurement mode. It is recommended to calibrate the tester frequently, especially if high accuracy is required. More frequent calibrations may be required depending on the type of sample being tested. The tester should be recalibrated: • whenever the pH electrode is replaced • at least once a month • after testing aggressive samples pH Calibration Procedure From measurement mode, press and hold /MODE until “CAL” is displayed. The tester enters calibration mode and displays “pH 7.01 USE” or “pH 6.86 USE”, if NIST buffer was selected. Buffer value will be displayed on the first LCD line and “REC” message will be displayed on the second line. If used buffer was not valid, “USE” message will be displayed for 12 seconds and replaced by “WRNG” indicating measured sample is not valid. • For one-point calibration using pH 4.01, 10.01 or 9.18 buffer solution, once the reading has stabilized, the tester automatically accepts the calibration point. Accepted buffer point and “OK 1” message are displayed and then the tester returns to measurement mode. • For one-point calibration using pH 7.01 (or 6.86) buffer solution, press /MODE after calibration point has been accepted. The tester will display “pH 7.01” (or “pH 6.86”) and “OK 1” and then return to measurement mode. • For a two-point calibration using pH 7.01 (or pH 6.86) buffer solution, after the first calibration point has been accepted, “pH 4.01 USE” will be displayed for 12 seconds (unless a valid buffer is recognized). • If valid buffer solution is recognized (pH 4.01, 10.01 or 9.18), the calibration point is accepted and the accepted value and “OK 2” are displayed. The tester then returns to measurement mode. • If no valid buffer solution is recognized, “WRNG” message is displayed. Note: When the calibration procedure is completed, the “CAL” tag is turned on. Exiting Calibration • When in calibration mode, it is possible to exit calibration procedure by pressing /MODE, before first-point calibration has been accepted. The tester displays “ESC” and returns to measurement mode and last calibrated data. • When in calibration mode, it is possible to clear a previous calibration and return to default values by pressing SET/HOLD, before the first calibr