AQUATERR INSTRUMENTS M-300 사용자 설명서 - 페이지 6

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COMMON PROBLEMS (Soil Moisture Measurements)

PROBLEMS

Widely varying readings, due to lack of Soil

Compaction caused by wiggling the probe.

Lower/higher than expected readings.

Probe in water, meter will not read 100.

SOLUTIONS

With the sensor in air, push the "EC" button and wait until the "EC-ON" light illuminates. The EC

reading should be zero. If the reading is not zero, turn the upper left knob "CAL" until the

display shows a zero reading.

The Salinity Multimeter senses the salinity of the moisture component in the soil, thus the

more water present, the better the readings will be. The best time to take a reading is shortly

after irrigation. Also, make sure the sensor has intimate contact with the soil and take several

readings at each location. Make sure that the sensor has reached temperature equilibrium (in

the soil for two to three minutes) before calibrating, and recalibrate when temperature

changes occur.

1. Push the probe into the soil to the desired depth. If the ground is too hard use an auger.

The sensing window and wings must be in contact with the soil for repeatability.

2. Push the "MSTR" button. The reading is the soil moisture level. Set the moisture

compensation knob "W" (upper right corner) to the moisture level being displayed.

3. Push the "EC" button. After about 4 seconds the "EC–ON" light will illuminate and the

meter will read the salinity in µS. (microSiemens).

4. WIPE OFF the probe with a towel between readings. Soil carry-over (attached to sensor)

between readings can be a significant problem with salinity readings.

When measuring the salinity of a liquid with your Meter, the most accurate reading is made

when the liquid just covers the winged portion of the probe (about 4 inches (10cm) above the

tip). Make sure the sensor has reached temperature equilibrium with the liquid (in the liquid

for 2-3 minutes) before calibrating and is recalibrated whenever temperature changes occur.

1. Place sensor into the liquid.

Insert probe, press the dirt around the

probe by standing close to both sides of the

probe. Then take reading.

Recalibrate the meter in irrigation water.

Change the battery. Remove battery cover

with a screw driver and replace the 9 volt

battery inside with a new one.

MEASURING SOIL SALINITY

MEASURING LIQUID SALINITY