Thermo Fisher Scientific EcoScan DO 6 User Manual

Page 33

Instruction Manual

DO 6

Taking Measurements

During measurement, care must be taken to ensure that the probe’s membrane
surface does not touch anything. Stir around the solution to prevent any air
bubbles from being trapped on the
membrane before taking a reading. Also,
DO NOT immerse the probe fully or allow
the water level to pass the neck of the
probe, since it is NOT waterproof.

IMPORTANT: Since the DO probe

consumes oxygen from the sample, the
sample must constantly flow past the
membrane to achieve more accurate
readings. You can use a stirrer to
accomplish this.

5.2.1

To take measurements:

1) Rinse the probe well with DI water or

rinse solution.

2) Select the appropriate measurement

mode. Press the MODE key to toggle
between modes:

a. Percentage Saturation (%)

b. Concentration (mg/L) or (ppm)

c. Temperature

(T)

3) Dip the probe into the sample. Stir the solution gently to homogenize the

sample. Make sure that the sample is continuously flowing past the
membrane sensor.

4) Take your measurements once your meter reading has stabilized.

Note: “Ur”/”Or” will be displayed if the instruments exceeds the specified
measuring range. See Section 12

for range specification.

To select between mg/L and ppm units, see Set Up menu on page 38.

mg/l

MODE

Figure 14: Measurement mode