Brookfield CAP1000 Viscometer Manual do Utilizador descarregar pdf (Página 19)

Brookeld Engineering Labs., Inc. Page 17 Manual No. M02-312A0607

• In ambient conditions outside of 15°C to 30°C, accuracy is +/- 2.0°C when the temperature

set point on the viscometer is 50°C to ≤100°C.

III.3 Calibration Verication

Accuracy of the CAP 1000+ Viscometer can be veried by performing a calibration verica-

tion.

The cones/spindles that were shipped with the viscometer were calibrated to the viscometer by

Brookeld prior to shipment. If your viscometer was returned to Brookeld or an authorized

Brookeld Dealer, then any cones/spindles that were returned for service will have been cali-

brated to the viscometer prior to shipment.

When you receive the instrument, perform a calibration verication on each cone spindle to

ensure that each spindle is measuring correctly. This will ensure that everything is in good

working order and that the instrument and/or cone spindles have not experienced a change

during shipment. If the calibration verication fails then you can take advantage of the CAP

Viscometer’s unique feature which allows the operator to recalibrate each cone spindle to the

CAP Viscometer (See Section III.4).

Calibration verication is also performed when viscosity readings with your product are sus-

pect. Verifying the calibration will determine if the cone needs to be recalibrated to the instru-

ment. This will help you to determine if the discrepant readings on your product are due to

cone/instrument performance, or your method or your product. Complete cone recalibration

is discussed in Section III.4.

To perform a cone calibration verication, you will need a mineral oil from Table III-5 or Table

III-6. Determine what range model CAP 1000+ Viscometer you have (Low Torque or High

Torque), which temperature range (L = Low, H = High; consult the instrument serial tag) and

what cone your are using.

You must use the following method, regardless of what your test calls for:

1. Put the cone in the down position, and make sure that the solvent trap is covering the

spindle.

2. Allow the viscometer to stabilize for at least 30 minutes at 25°C (Low Temp units) or at

60°C (High Temp) if the temperature that you normally operate is different; otherwise, wait

5 minutes, then make sure the cone is in the down position and that the solvent trap is on.

3. At the end of the temp stabilization period, dispense the appropriate volume of uid (consult

Table III-5 or Table III-6). Figure III-1 shows how to dispense the uid onto the plate and

determine visually if the amount is appropriate.

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Brookfield CAP1000 Viscometer Manual do Utilizador Página 19