Hanna Instruments HI 993310, Instruction Manual, Page: 9 / 10

9
Onion
Bean
Strawberry
1.50-2.00
2.00-2.50
2.00-2.50
Lettuce
Egg plant
Melon
Potato
Pepper
Pea 1.00-1.50
2.50-3.00
1.50-2.50
2.00-3.00
2.00-3.00
1.00-1.50
Tomato
Celery
Marrow 2.50-5.00
2.00-2.50
2.00-2.50
To measure the conductivity of diluted soil solutions follow this
procedure:
A) Sample preparation:
1) Extract the soil by:
- Taking one 1 sample for every 1000 m
2
(0.25 acre) of homogeneous
plot of land;
- Even for smaller plots, at least 2 samples are recommended (the
more samples are taken, the more representative the end-result will
be);
2) Avoid extracting samples from soil showing obvious anomalies.
Treat this type of soil separately;
3) Sample quantity:
Take the same quantity of soil for each sample. For example, use
bags with the same dimensions (1 bag per sample);
4) Depth of extraction:
General: dig and discard 5 cm (2") of the topsoil
Herbaceous crops: from 20 to 40 cm (8" to 16")
Orchards: from 20 to 60 cm (8" to 24'’);
5) Spread the soil samples on pages of a newspaper and let the soil
dry in a shady place, or in an oven at 40° C (104°F);
6) Crumble the dried soil and mix all the samples together to obtain
a homogeneous mixture. Discard stones and vegetable residues;
7) From this mixture, take the soil sample for the analysis.
PREPARATION OF SAMPLE PREPARATION OF SAMPLE
PREPARATION OF SAMPLE PREPARATION OF SAMPLE PREPARATION OF SAMPLE
12
OPERATIONAL GUIDE OPERATIONAL GUIDE OPERATIONAL GUIDE OPERATIONAL GUIDE OPERATIONAL GUIDE
• Each meter is supplied complete with a 9V battery and two
probes. Slide off the battery compartment cover on the back of
the meter (see page 15). Install the battery while paying
attention to its polarity.
• Connect the right probe for your measurement. Connect HI 76305
(stainless steel) for soil salinity or HI 76304 (plastic) for water
conductivity
• Connect the probe to the meter securely by aligning the pins with
the socket and pushing the plug in. Always detach the probe by
holding on the connector (and not rhe cable).
• Make sure that the meter has been calibrated before taking any
measurements (see page 7 for calibration).
• Immerse the conductivity probe into the
sample (approx. 5 cm/2"). If possible, use
plastic beakers or containers.
• For soil salinity measurements, directly insert
the stainless steel probe to a depth of 15
cm (6") in the soil.
• Turn the instrument on by pressing the
ON/OFF key.
• Press the "C" key for Water Conductivity or "S" for Soil Salinity
measurement.
NOTE: Ensure that the probe is also changed when the type of
measurement is changed
• In Water Conductivity mode wait for a couple of minutes for the
temperature sensor to reach thermal equilibrium with the sample
before taking measurements.
When the sample's temperature is lower than 20°C or higher
TOP VIEW of
HI 993310
Socket for
probe
5 cm
(2“)
ON
OFF
C S