Brookfield BF35 Bedienungsanleitung PDF herunterladen (Seite 15)

Brookeld Engineering Labs., Inc. Page 15 Manual No. M13-10000

Section 5 - Calibration

Calibration

The BF35 Viscometer can lose calibration while in service if the bob shaft

bearings become contaminated or if the bob shaft itself is bent. If the dial does

not read zero when it should or if there is excessive dial deection when the main

shaft is turning, this may indicate that the bob shaft bearings are sticking. If the

spring appears to be non-linear, the bob shaft may be bent. Your viscometer will

require servicing if it exhibits any of these symptoms.

According to API Recommended Practice 10B-2, viscometers being used for

testing well cement should be calibrated quarterly. API Recommended Practice

13B-1 and 13B-2 specify viscometers being used for drilling uids should be

checked monthly.

Procedure

1. Choose the certied calibration uid using the temperature-viscosity chart

supplied with the calibration uid to cover the viscosity range of interest.

Make sure the lot number on the chart matches the lot number on the uid

container. Each lot of standard uid is individually certied. The viscosity

will normally vary slightly from lot to lot.

2. Clean and dry the viscometer bob, sleeve, and cup. Place the viscometer

and the calibration uid side-by-side on the counter top in a room with a

reasonably constant temperature (variation of less the 5˚F ± 2.5˚F). Allow

the viscometer and the uid to stand at least two hours to equilibrate.

3. Operate the viscometer in air for two to four minutes to loosen up the

bearings and gears. Observe the rotor sleeve for excessive wobbling and

replace if necessary.

4. Fill the cup to the scribed line with calibration uid and place it on the

viscometer stage. Move the stage upward until the uid level is to the ll

line on the sleeve.

Fill Line

Viscometer Sleeve

5. Place a thermometer capable of ± 0.2˚F (0.1˚C) into the uid and hold or

tape it in place to prevent breakage. Operate the viscometer at a low speed

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