Hanna Instruments hi 991301 User Manual

0.00 to 14.00

0.00 to 20.00 mS/cm

0.00 to 10.00 ppt

0.0 to 60.0°C or 32.0 to 140.0°F

0.01pH

0.01 mS/cm

0.01 ppt

0.1°C or 0.1°F

±0.01pH

±2% F.S.

±0.5°C or ±1°F

±0.03pH

±2% F.S.

±0.5°C or ±1°F

Automatic

ß=0.0 to 2.4%/°C

1 or 2 point with auto-buffer recognition
4.01/7.01/10.01 pH or 4.01/6.86/9.18 pH

Automatic (25°C/77°F) 1 point at:

12.88 mS/cm, 6.44 ppt (0.5 conv.) 9.02 ppt (0.7 conv.)

0.45 to 1.00 (CONV)

Conversion Factor
Probe  HI 1288

pH/EC/TDS/temp. probe (included)

4 x 1.5V AAA with BEPS / 500 hours

0 to 50°C (32 to 122°F); RH 100%

143x80x38mm (5.6x3.2x1.5”)

To connect the probe
Connect the HI 1288 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 HI 1288 probe before taking any mea-
surement.

To turn the meter on and to check battery status
Press  and hold 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 

BATT

.

To select the measurement unit (pH or EC or TDS)
Press the SET/HOLD button while in normal measurement
mode. The meter will display pH or EC or TDS.Temperature
will always be displayed on the bottom. Eg. 

pH

 5.73 

22.5 

°C

.

To freeze the display
Press and hold the SET/HOLD button for 2 seconds until
HOLD appears on the secondary display. Eg. 

pH

 5.73 

hold.

Press any button to return to normal mode.

To turn the meter off
Press the ON/OFF/MODE button while in normal measure-
ment mode. 

OFF

 will appear on the lower part of display.

Release the button.

Use the SET/HOLD button to change the temperature unit,
and then press the MODE button three times, until the meter
returns to normal measurement mode.

To reset to the default calibration
To clear a previous calibration, press the MODE button af-
ter entering the calibration mode. The lower LCD will dis-
play ESC for 1 second and the meter will return to normal
measurement mode. The “CAL” symbol on the LCD will
disappear. The meter will be reset to the default calibration.

Battery replacement
The meter displays the remaining battery percentage every
time it is turned on. When the battery level is below 5%, the

-    +

 symbol on the bottom left of the LCD lights up to indi-

cate a low battery condition. If the battery level is so low as
to cause erroneous reading, the Battery Error Prevention
System (BEPS) will automatically turn the meter off.
To change the batteries, remove the 4 screws located on
the back of the meter. Once the back has been removed,
carefully replace the 4 AAA batteries located in the compart-
ment while paying attention to their polarity. Replace the
back, making sure that the gasket is properly seated in
place, and tighten the screws.

Calibration solutions
HI 77400P

pH 4.01 & 7.01 (20 mL, 5 pcs each)

pH 7.01 & 10.01 (20 mL, 5 pcs each)

pH 4.01 calibration solution (20 mL, 25 pcs)

pH 6.86 calibration solution (20 mL, 25 pcs)

pH 7.01 calibration solution (20 mL, 25 pcs)

pH 9.18 calibration solution (20 mL, 25 pcs)

pH 10.01 calibration solution (20 mL, 25 pcs)

12.88 mS/cm @25°C (20 mL, 25 pcs)

6.44 ppt (g/L) @25°C (20 mL, 25 pcs)

Other accessories
HI 710007

Protective rubber boot

HI 991301 is in compliance with the CE directives.

    IS991301R3  02/02

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