INSTRUCTION MANUAL
HI98331
Direct Soil Conductivity &
Temperature Meter with
built-in Stainless Steel
Conductivity Probe
Warranty
The GroLine is warranted for a period of one year
against defects in workmanship and materials
when used for its intended purpose and maintained
according to instructions. 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 charge 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.
• Pour 3” of standard
HI7031
into a beaker.
• Place the probe in calibration solution
HI7031
.
The probe tip should be centered in the solution
and submersed 2” (5 cm). The probe should be
kept at least 1” from the walls and bottom of the
beaker. The meter will automatically recognize
the solution.
• If the solution is not recognized or is out of the
accepted range “---- WRNG“ is displayed.
• If the standard is recognized “REC“ is displayed
until the reading is stable and the calibration is
accepted.
• After acceptance, the “Stor” message is displayed
and meter returns to measurement mode.
Clear calibration
Place meter in calibration mode. Press and hold
ON/OFF until “Clr” is displayed. The meter will now
be at default calibration.
After restarting the meter the “Err CAL” message
will appear (for 2 seconds) until a new calibration
is performed.
Error Message
If the measured temperature is higher than
50.0 ºC or lower than 0 ºC, the 50.0 ºC or 0.0 ºC
temperature value will blink on the LCD in measure
mode. In both cases, the “Err TEMP” message will
appear. If CAL or HOLD mode was entered by the
user the meter will enter in measurement mode.
To reenter Setup press Setup button again.
To select EC unit
To select the measurement unit when “EC UNIT”
is displayed press the ON/OFF briefly to change
between mS/cm, dS/m or μS/cm.
To select the temperature unit (°C/°F)
To select the temperature unit when “TEMP” is
displayed press the ON/OFF briefly to change
between °C or °F.
To select the Auto-Off time
To select the AUTO OFF when “AOFF” is displayed
press the ON/OFF briefly to change between 8 min,
60 min or --- (disabled).
To select the HOLD mode
To select the Hold mode when “HOLD” is displayed
press the ON/OFF briefly to change between
disabled “no“, Hold mode “YES“ or Stability mode
“StAb“.
To return to measurement mode
Press and hold the Setup button for 1 second to
exit the menu (or press and hold ON/OFF button for
2 seconds after the last parameter was selected).
HI7031-023
1413 μS/cm (1.41 mS/cm)
GroLine Conductivity Standard
Solution, 230 mL bottle
HI7031M
1413 μS/cm (1.41 mS/cm)
calibration solution, 230 mL
HI7031L
1413 μS/cm (1.41 mS/cm)
calibration solution, 500 mL
HI70031P
1413 μS/cm (1.41 mS/cm)
calibration solution,
20 mL sachets (25 pcs.)
Accessories
IST98331 07/18
Setup
Button
Battery Replacement
Replace the battery when percentage indicator
approaches 0%. To change the CR2032 Li-ion
battery, turn the battery cover located on the back
of the meter counterclockwise to unlock. Remove
cover and replace with new b side facing
up. Push the ON/OFF button to start the meter.
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.
For better accuracy, frequent calibration of the
meter is recommended. In addition, the instrument
must be recalibrated whenever:
• When high accuracy is required.
• At least once a month.
Measurement
Press the ON/OFF button to turn the meter ON. Place
the probe to the desired depth and saturate the soil
if needed with deionized water. The conductivity
value, automatically compensated for temperature,
will be shown on the LCD.
The meter displays conductivity in the selected unit.
The temperature measured by the probe will be
shown on the secondary LCD.
Note: Before taking any measurement make
sure the meter has been calibrated.
Calibration procedure
• Enter calibration mode from measurement
mode.
• The meter will enter the calibration mode,
displaying “1.41 USE” .
Measurement and Calibration
Maintenance:
1) Rinse probe with water after use and between
samples. Dry off.
2) Store GroLine with the protection cover over
conductivity probe.
