Brookfield DV1 User Manual

Brookeld Engineering Laboratories, Inc. Page 49 Manual No. M14-023
Follow theses steps using one of the recommended spindles to verify calibration of your instrument.
1) Place the viscosity standard uid (in the proper container) into the water bath.
2) Lower the DV1 into measurement position (with guard leg if LV or RV series viscometer
is used).
3) Attach the spindle to the viscometer. If you are using a disk shaped spindle, avoid trapping
air bubbles beneath the disk by rst immersing the spindle at an angle, and then connecting
it to the viscometer.
4) e viscosity standard uid, together with the spindle and guardleg, should be immersed
in the bath for a minimum of 1 hour, stirring the uid periodically, prior to taking
measurements.
Don’t introduce air bubbles.
e spindle can be rotated in the uid to accelerate temperature equilibrium.
5) Aer 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;
include % and cP (mPa•s).
NOTE: e spindle must rotate at least ve (5) times before readings are taken.
7) e viscosity reading should equal the cP value on the viscosity uid standard to within
the combined accuracies of the viscometer and the standard (as discussed in the end of
this section entitled, Interpretation of Calibration Test Results).
Calibration Check 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. e 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 sha spindle) to the DV1.
4) Allow sucient time for the viscosity standard, sample chamber and spindle to reach test
temperature.
5) Measure the viscosity and record the viscometer reading; include % and cP (mPa•s).
NOTE: e spindle must rotate at least ve (5) times before readings are taken.

Brookfield DV1 Specifications

General

Speed Range	0.3 to 100 rpm
Display	LCD
Number of Speeds	18
Power Supply	100-240 VAC, 50/60 Hz
Viscosity Range	1 to 2, 000, 000 cP
Temperature Measurement	Optional
Accuracy	±1% of full scale range
Repeatability	+/- 0.2%