Brookfield DVE - Calibration Check for LV, RV, HA, HB Spindles

AMETEK Brookeld Page 37 Manual No. M15-356-B0916
Brookeld does not recertify Viscosity Standard Fluids. We will issue duplicate copies of the
Certicate of Calibration for any uid within two years of the purchase date.
Brookeld Viscosity Standard Fluids are reusable provided they are not contaminated. Normal
practice for usage in a 600 mL beaker is to return the material from the beaker back into the bottle.
When using smaller volumes in accessories such as Small Sample Adapter, UL Adapter, ermosel
or Spiral Adapter, the uid is normally discarded.
Calibration Check Procedure for LV (#61-63) and RV,HA,HB (#1-6) Brookeld Spindles
NOTE: e LV-4 (#64) and the RV, HA, HB #7 spindles have been omitted from this
procedure. Brookeld does not recommend the use of these spindles to perform
a calibration check on your instrument. Reasons pertain to the small amount of
spindle surface area that makes contact with the viscosity standard, the diculty
of establishing the immersion mark precisely and the need for precise temperature
control at 25°C in the immediate vicinity of the spindle. When using RV-1 or HA/
HB-1 spindles for calibration, select speeds less than 50 rpm and use a viscosity
standard greater than 100 cP.
Follow these 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 DVE 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 guard leg, 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).