OfiTE 800 - Calibration

OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 12
Calibration
The Model 800 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.
The OFITE Calibrating Instrument (Part No. 130-45-1) and the Calibration
Check Kit (Part No. 132-49) are available to facilitate calibration. The
Calibrating Instrument uses a dead-weight method of calibrating, while the
Calibration Check Kit is uid based.
130-45-1 Calibrating Instrument
132-49 Calibration Check Kit
Equipment:
#130-45-1 Calibrating Instrument for 8-Speed Viscometer (Requires a trained
technician)
#132-49 Calibration Check Kit
Calibration Fluids, “Certied”:
#132-84 Calibration Fluid, 20 CP, 16 oz (500 mL)
#132-81 Calibration Fluid, 50 CP, 16 oz (500 mL)
#132-80 Calibration Fluid, 100 CP, 16 oz (500 mL)
#132-83 Calibration Fluid, 200 CP, 16 oz (500 mL)
#132-82 Calibration Fluid, 500 CP, 16 oz (500 mL)