Brookfield DV-III Ultra Rheometer - Manual (Page 116)

Brookfield Engineering Laboratories, Inc. Page 116 Manual No. M/98-211-B0104
Brookfield Engineering Laboratories, Inc. Page 116 Manual No. M98-211-E0912
Calibration Procedure for LV (#1-3) and RV,HA,HB (#2-6) Brookfield spindles :
Note: The LV #4 (#64) and RV, HA, HB #7 spindles have been omitted from this
procedure. Brookfield does not recommend the use of these spindles to perform
a calibration check on your instrument. Reasons pertain to the small amount
of surface area that makes contact with the viscosity standard, the difficulty of
establishing the immersion mark precisely and the need for precise temperature
control at 25°C in the immediate vicinity of the spindle.
Follow these steps using one of the recommended spindles to verify calibration of your
instrument.
1) Place the viscosity standard fluid (in the proper container) into the water bath.
2) Lower the DV-III Ultra into measurement position (with guard leg if LV or RV series Rheometer
is used).
3) Attach the spindle to the Rheometer. If you are using a disk shaped spindle, avoid trapping air
bubbles beneath the disk by first immersing the spindle at an angle, and then connecting it to
the Rheometer.
4) The viscosity standard fluid, together with the spindle, should be immersed in the bath for a
minimum of 1 hour, stirring the fluid periodically, prior to taking measurements.
5) After 1 hour, check the temperature of the viscosity standard fluid with an accurate
thermometer.
6) If the fluid is at test temperature ( + /- 0.1
° C of the specified temperature, normally 25 ° C),
measure the viscosity and record the Rheometer reading.
Note: The spindle must rotate at least five (5) times before readings are taken.
7) The viscosity reading should equal the cP value on the viscosity fluid standard to within the
combined accuracies of the Rheometer and the standard (as discussed in the section entitled,
Interpretation of Calibration Test Results).
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 fluid 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 fluid and attach the extension link, coupling nut and free hanging
spindle (or directly attach the solid shaft spindle) to the DV-III Ultra.
4) Allow 30 minutes for the viscosity standard, sample chamber and spindle to reach test
temperature.