User Guide

Instruction Manual DO 100

5 MEASUREMENT

During measurement, care must be taken not to allow the membrane of the DO probe touch

any surface. It is always advisable to insert the probe guard (refer to Figure 33 and 34 on

pages 40 and 41). The probe can either be fully or partially immersed in the solution.

The READY indicator appears on the display when the readings stabilise. It will turn off if the

readings start to fluctuate.

NOTE: It is important that the sample is stirred constantly to allow it to flow past the

membrane for better readings.

5.1 Taking Measurement

1. Rinse the probe with deionised or distilled water

before use to remove any impurities adhering to the

probe body. If it is dehydrated, soak it for 30

minutes in tap water.

2. Switch on the meter. The MEAS annunciator

appears on the top of the LCD. The ATC indicator

appears in the lower right hand corner to indicate

Automatic Temperature Compensation. See figure

on right.

3. Dip the probe into the sample.

NOTE: When dipping the probe into the sample, make

sure the tip of the probe is completely immersed. Stir the

sample gently to create a homogenous sample. Be sure

to tap probe very gently to remove air bubbles. Air

bubbles will cause errors in the reading.

4. Allow time for the reading to stabilise. Note the

reading on the display. When the reading is stable,

the READY annunciator appears.

5. To toggle between % Saturation and mg/L

measurement mode, press the MODE key. See

Figure 11.

Figure 11: Taking Measurement