AQUATERR INSTRUMENTS M-300 Kullanıcı Kılavuzu - Sayfa 10

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CALIBRATING THE SALINITY FUNCTION (Salinity Multimeter)

Caution: This should only be done as a last resort after you have tried everything else and

We have provided two methods of calibrating the salinity function. The first method is more

convenient for laboratory or controlled conditions; the second is more convenient in the field.

The calibration knob "CAL" is located on the upper left hand side of the meter's panel. Make

sure that the knob to the right of the meter's panel "W" is turned the furthest clockwise

position for liquids and set to 100 for soils.

First Method:

Using a Bench Top Meter – If you have a calibrated bench-top or laboratory EC meter:

1. Prepare a water sample at or near the field EC using table salt and your bench top

meter.

2. Follow instructions for measuring liquid salinity. Remember to give the meter two to

three minutes to reach temperature equilibrium.

3. Compare the Multimeter meter reading to the bench top reading.

4. Adjust the Multimeter calibration knob "CAL" (left of the meter) until the meters

agree.

Second Method:

Air – This will set your meter to a repeatable value, but not to the accuracy which can be

obtained by calibration with a bench top meter.

1. Place the Multimeter in the sample and wait two or three minutes to reach

temperature equilibrium (the longer the better).

2. Quickly take the meter out of the sample, wipe off the tip and press EC button.

3. When the EC-ON light comes on adjust the calibration knob "CAL" (left of the

meter) until the Multimeter reads 0.1 in the air. This is the best starting point for

field use.

If neither of these methods work, remove the battery cover (four small Phillips head screws),

and carefully disconnect the battery cable from the battery. Then locate the coarse zero set

(see diagram), and using a small screwdriver, rotate the small screw counterclockwise to

increase, clockwise to decrease, and follow the above directions.

you are certain that it is required.