便携式溶解氧探头（MINI-DO）用户手册资源-CSDN文库

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USER MANUAL

MINI DISSOLVED OXYGEN PROBE (MINI-DO)

Specifications

Dimensions dia 15mm, length 90mm

Measuring principle galvanic cell, self temperature compensating

Type % saturation

Output c. 25 mV at 100% O

2

saturation, output impedance is c. 2 kOhm

Wiring White wire is zero (0 or GND,) brown wire is positive

Flow requirements typically 1 cm/sec, depending on oxygen saturation and temp

Cable 3 m, other lengths available on request

Measuring range 0-200%

Accuracy typically better than ± 1% of measured value, depending on calibration

Repeatability typically better than ± 0.5% of measured value

Response time T

90

(90% of end value) is <20 sec

Maintenance

Between sample measurements, immerse the tip of the probe in distilled water. For long-time

storage keep the probe in the moist storage chamber to avoid evaporation of the electrolyte

fluid.

Calibrating the probe

1. Connect the probe to an oxygen analyzer.

2. Place the probe in a calibration chamber with a water saturated atmosphere or in a

mixed air-equilibrated water sample.

3. When the reading stabilizes, adjust the meter reading according to the chart in table 1,

following the meter manufacturer’s instructions. If measuring in a saline solution,

remember to correct for changes in oxygens solubility in water according to tabulated

values, i.e. Green&Carrit, 1967. Journal of Marine Biology 25:140-147 (appendix).

4. Next, place the tip of the probe in oxygen free distilled water. Oxygen free distilled

water can be achieved by purging nitrogen gas into the sample water or by dissolving

approximately 10 grams of Na

2

SO

3

in 500 mL of distilled water.

5. When the reading is stable, adjust the zero control on the meter until the reading

displayed indicates zero.

6. Rinse the probe with distilled water.

7. Place the probe into the sample, and record the sample dissolved oxygen when the

reading is stable.

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