Brookfield DV-E Viscometer - Manual (Page 15)

Brookfield Engineering Labs., Inc. Page 15 Manual No. M98-350-J0912
II.4 Autorange and CGS or SI Units Selection
The
AUTO RANGE key allows you to determine the maximum calculated viscosity (full scale
reading) possible with the current spindle/speed setting. Pressing the key at any time will cause
the current viscosity display to change and show that maximum viscosity. The screen torque display
will now display “%100” to indicate this special condition. This maximum viscosity and %100
value will be displayed for as long as the AUTO RANGE key is depressed. Figure II-7 shows the
AUTO RANGE function for the situation where the No. 2 RV spindle is rotating at 10 RPM. The
full scale range is 4000 cP (or 4000 mPa
.
s).
cP 4000
10RPM %100
S02
Figure II-7
Pressing and holding the AUTO RANGE key during power on will enable the viscosity unit
displayed to toggle between CGS (cP) and SI (mPa•s) units. To change the unit format:
1. Turn the power off.
2. Press and hold the AUTO RANGE key and turn the power ON.
The DV-E
will retain the unit selection when the viscometer is turned OFF.
CGS SI
Viscosity: cP mPa
. s
1 cP = 1 mPa•s
II.5 Out of Range
The DV-E
gives indications for out of specification or out-of-range operation. When % (Torque)
readings exceed 100.0 % (over-range), the display changes to that shown in Figure II-8. You must
either reduce the speed or use a smaller size spindle to correct this condition.
cP EEEE
10RPM %EEEE
S02
Figure II-8
If you operate at spindle speeds that produce % (Torque) below 10.0 % (under-range), the DV-E
displays both % (Torque) and cP (Viscosity) with flashing unit designations, as shown is Figure
II-9
. You must either increase speed or use a larger size spindle to correct this condition.
The parameters of % (Torque) and cP (Viscosity) will also flash prior to one complete spindle
revolution. It is not recommended that readings are taken while parameters are flashing.