Hanna Instruments HI 991000 User Manual

Battery replacement

The meter displays the remaining percentage when turned

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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. If the battery level is low enough to cause erroneous readings, the Battery Error Prevention System (BEPS) turns the HI991000 off.

To ensure a watertight seal, the batteries are accessed by separating the front and back halves of the meter. The 4 Philips-head screws are located on the 4 corners of the back of the meter. Once the back has been removed, carefully replace the 4 AAA batteries located in the battery compartment, paying attention to their polarity. Re-attach the back, making sure that the gasket is in place.

Calibration solutions

HI 77400P pH 4.01 & 7.01 (20 mL, 5 pcs each) HI 770710P pH 7.01 & 10.01 (20 mL, 5 pcs each) HI 70004P pH 4.01 calibration solution (20 mL, 25 pcs) HI 70006P pH 6.86 calibration solution (20 mL, 25 pcs) HI 70007P pH 7.01 calibration solution (20 mL, 25 pcs) HI 70009P pH 9.18 calibration solution (20 mL, 25 pcs) HI 70010P pH 10.01 calibration solution (20 mL, 25 pcs)

HI 991000 Instruction Manual

Portable pH Meter

SPECIFICA TIONS Range pH 0.00÷14.00

Temperature 0.0÷60.0°C or 32.0÷140.0°F

Resolution pH 0.01pH

Temperature 0.1°C or 0.1°F

Accuracy pH ±0.01pH (@20°C/68°F)Temperature ±0.5°C or ±1°F

Typical EMC pH ±0.03pH Deviation Temperature ±0.5°C or ±1°F

Temperature Automatic Compensation

pH Calibration 1 or 2 point with auto-buffer recognition

pH 4.01/7.01/10.01 or pH 4.01/6.86/9.18

Probe HI 1291 pH/temperature probe (included) Battery Type/Life 4 x 1.5V AAA with BEPS / 500 hours Environment 0 to 50°C (32 to 122°F); RH 100% Dimensions 143x80x38mm (5.6x3.2x1.5”)

Other accessories

HI 710007 Protective rubber boot

HI991000 is in compliance with the CE directives

EN 50081-1, EN 50082-1 and EN 61010-1.

http://www.hannainst.com

IS991000R2 11/00

Stabilty indicator

Battery percentage

Low battery indicator

ATC

CAL

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ppm ppt µS pH

°C °F

Primary display

Secondary display

Selectable temperature unit

OPERA TIONAL GUIDE To connect the probe

Connect the HI 1291 probe to the DIN socket on the top of the HI991000 by aligning the pins and pushing in the plug. Tighten the nut to ensure a good connection. Remove the protective cap from the HI1291 probe before taking any measurements.

To turn HI991000 on and to check battery status

Press the ON/OFF/MODE button for 2 seconds. All the used segments on the LCD will be visible for a few seconds, followed by a percent indication of the remaining battery life. Eg. % 100 BA TT.

To turn HI991000 off

Press the ON/OFF/MODE button from normal measuring mode. OFF will appear on the bottom display.

To freeze the display

Press the SET/HOLD button for 2 seconds until HOLD appears on the bottom display. Eg. pH 5.73 hold.

Press any button to return to normal mode.

pH MEASUREMENTS & CALIBRATION

• Make sure the meter has been calibrated.

• If the electrode has been left dry, soak in pH 7 to reacti-

vate.

• Place the tip of the probe in the sample to be tested.

• Shake the probe briefly while submerged and wait until

the ! symbol on the top left of the LCD is turned off.

• The LCD will show the pH value automatically compen-

sated for temperature and the temperature of the sample.

• If measurements are taken in different samples succes-

sively, rinse the probe tip thoroughly to eliminate crosscontamination; and after cleaning, rinse the probe tip with some of the sample to be measured.

• Press the SET/HOLD button for changing the buffer set.

• Press the ON/OFF/MODE button to return to normal pH measuring mode.

pH calibration

• Press and hold the ON/OFF/MODE button for 3 seconds, until OFF on the bottom display is replaced by CAL.

• Release the button. The LCD will display pH 7.01 USE or pH 6.86 USE (if you selected the NIST buffer set).

• For a

TO CHANGE THE TEMPERATURE UNIT (FROM °C T O °F)

Press the ON/OFF/MODE button for 6 seconds, until CAL on the bottom display is replaced by TEMP and the current temperature unit. Eg. TEMP °C.

Use the SET/HOLD button to change the temperature unit, and then press ON/OFF/MODE until the meter returns to normal measuring mode.

single point pH calibration, place the 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 and will display OK for 1 second.

If the pH 7.01 buffer (or 6.86 if you selected the NIST buffer set) was used, press the ON/OFF/MODE button to return to the pH measuring mode.

two point pH calibration, place the probe in pH 7.01 (or 6.86, if you selected the NIST buffer set). The LCD will display the recognized buffer value and OK for 1 second and then display pH 4.01 USE.

Place the probe in the second buffer value (pH 4.01 or

10.01, or, if using NIST, pH 4.01 or 9.18). When the second buffer is recognized, the LCD will display OK for 1 second and the meter will return to normal measuring mode.

Calibration buffer set

• Press the ON/OFF/MODE button for 6 seconds, until CAL on the bottom display is replaced by TEMP and the current temperature unit. Eg. TEMP °C.

• Press the ON/OFF/HOLD button again to 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).

To reset to the default calibration

To clear a previous calibration, press the ON/OFF/MODE button after entering the calibration mode. The bottom LCD will display ESC for 1 second and the meter will return to normal measuring mode. The “CAL” symbol on the LCD will disappear. The meter will be reset to the default calibration.