Brookfield Dial Stepper Viscometer - Manual (Page 19)

Brookfield Engineering Laboratories, Inc. Page 19 Manual No. M00-151-H0612
Brookfield Viscosity Standard Fluid General Information
We recommend that Brookfield Viscosity Standard Fluids be replaced on an annual basis, one year from
date of initial use. Exposure to outside contaminants, such as solvent, standard of different viscosity
or other foreign material, requires replacement annually. Oil Fluids do have an expiration date on the
label that should be adhered to.
Viscosity Standard Fluids may be stored under normal laboratory conditions. Disposal should be in
accordance with state, local and federal regulations as specified on the material safety data sheet.
Brookfield Engineering Laboratories does not recertify Viscosity Standard Fluids. We will issue duplicate
copies of the Certificate of Calibration for any fluid within two years of the purchase date.
Brookfield 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 or Thermosel, the fluid is
normally discarded.
The following sections explain how to perform a calibration check on your viscometer using different
spindle geometries. For additional assistance, videos on these procedures are available on the Brookfield
website, www.brookfieldengineering.com.
Calibration Procedure for LV #1-3(61-63) and RV,HA,HB #1-6(01-06) Brookfield Spindles
Please note that the LV #4 and the RV, HA and 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 spindle surface area that
makes contact with the viscosity standard. The difficulty 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 by using one of the recommended spindles to verify calibration of your instrument:
1) Place the viscosity standard fluid (in a 600 ml low form beaker) into the water bath.
2) Lower the Viscometer 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 first immersing the spindle at an angle, and then connecting it
to the Viscometer.
4) The viscosity standard fluid, together with the spindle and guardleg (if used), 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 Viscometer reading.
Note: The spindle must rotate at least five (5) times before readings are taken.