Brookfield DV-E Viscometer Manuel d'utilisateur télécharger pdf (Page 26)

Brookeld Engineering Labs., Inc. Page 26 Manual No. M98-350-J0912

air bubbles beneath the disk by rst immersing the spindle at an angle, and then connecting

it to the viscometer.

4) The viscosity standard uid, together with the spindle and guard leg (if supplied), should

be immersed in the bath for a minimum of 1 hour, stirring the uid periodically, prior to

taking measurements.

5) After 1 hour, check the temperature of the viscosity standard uid with an accurate thermometer.

Fluid must be within ± 0.1°C of the specied temperature, normally 25°C. Allow longer

soak time if required to come to test temperature.

6) If the uid is at test temperature, measure the viscosity and record the viscometer reading.

Note: The spindle must rotate at least ve (5) times before readings are taken.

7) The viscosity reading should equal to the cP value on the viscosity uid standard to within

the combined accuracies of the viscometer and the standard (as discussed in Interpretation

of Calibration Test Results at the end of this Appendix).

Calibration Procedure for a Small Sample Adapter

When a Small Sample Adapter is used, the water jacket is connected to the water bath and the water

is stabilized at the proper temperature:

1) Put the proper amount of viscosity standard uid into the sample chamber. The amount varies

with each spindle/chamber combination. (Refer to the Small Sample Adapter instruction

manual.)

2) Place the sample chamber into the water jacket.

3) Put the spindle into the test uid and attach the extension link, coupling nut and free hanging

spindle (or directly attach the solid shaft spindle) to the DV-E.

4) Allow 30 minutes for the viscosity standard, sample chamber and spindle to reach test

temperature.

5) Measure the viscosity and record the viscometer reading.

Note: The spindle must rotate at least ve (5) times before a viscosity reading is taken.

Calibration Procedure for a Thermosel System

A two-step process is recommended for the Thermosel.

A) Evaluate the calibration of the Viscometer alone according to the procedure outlined in

this section, entitled Calibration Procedure for LV #1-3 (#61-63) and RV, HA, HB #2-6

Brookeld spindles.

B) Evaluate the Viscometer with the Thermosel according to the procedure described below.

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Brookfield DV-E Viscometer Manuel d'utilisateur Page 26