Campbell-scientific OBS-3+ and OBS300 Suspended Solids and Turbidity M Uživatelský manuál stáhnout pdf (Strana 27)

OBS-3+ and OBS300 Suspended Solids and Turbidity Monitors

8.1.2 Setup

1. Plug the test cable into the OBS sensor; connect the red and black leads to

the battery and clip the DMM or datalogger test leads across the blue (+)

and green (–) leads.

2. Swab sensor with an alcohol-soaked towel to sterilize it.

8.1.3 Procedure

1. In a large black tub of fresh tap water, aim the OBS sensor so that it’s the

maximum distance from the sensor optics to the far corner of the tub (see

FIGURE 8-2). Record a 10-second average of the low-range output.

Record the average output on the calibration log sheet.

2. Swap the DMM or datalogger + test lead to the high-range output lead

(white) and record a 10-second average of the high-range output. Record

the average output on the calibration log sheet.

FIGURE 8-2. Position of OBS-3+ (left) and OBS300 (right) in clean tap

water in big black tub

3. Pour the 1st SDVB standard into the appropriate size cup (see TABLE 8-1

and Section 8.1.1, Materials and Equipment).

4. Position the OBS sensor in the cup as shown on FIGURE 8-3 and record

10-second averages of the low- and high-range outputs. Record the

average outputs on the calibration log sheet.

5. Pour the standard back into its container.

6. Wipe sensor with a clean dry towel to remove residual standard.

7. Repeat steps 3, 4, 5, and 6 for the other standards.

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Campbell-scientific OBS-3+ and OBS300 Suspended Solids and Turbidity M Uživatelský manuál Strana 27