Brookfield Dial Viscometer Bedienungsanleitung PDF herunterladen (Seite 5)

Brookfield Engineering Laboratories, Inc. Page 5 Manual No. M/85-150-P700

II. GETTING STARTED

II.1 Operation

The Brookfield Viscometer is powered by a precision synchronous motor. Exact speeds of rotation

are assured as the motor will turn erratically and spasmodically if synchronization cannot be

maintained.

Speed changes are affected by a gear train having either four or eight speeds. Maximum speed

(RPM) will be set at full clockwise rotation and minimum speed at full counter-clockwise rotation.

Although not absolutely necessary, it is advisable to change speeds while the motor is running.

Four speed Viscometers have a square speed control knob with one number shown on each of four

faces. The instrument’s rotational speed is indicated by the number facing up. Eight speed models

have a square speed control knob with two numbers on each face; by moving the knob through two

complete turns, speeds may be changed in sequence. No trouble will be experienced in differenti-

ating between the two speeds shown on each face since each pair is in the ratio of 20:1. To insure

rotation at the indicated speed, it is important that the face of the knob upon which this speed is shown

be closely parallel to the viscometer’s dial.

LV Viscometers are provided with a set of four spindles and a narrow guard leg; RV Viscometers

come with a set of seven spindles and a wider guard leg; HA and HB Viscometers come with a set

of seven spindles and no guard leg.

The spindles are attached to the viscometer by screwing them to the lower shaft. Note that the

spindles have a left-hand thread. The lower shaft should be held in one hand and lifted up. The

spindle should be screwed to the left. The face of the spindle nut and the matching surface on the

lower shaft should be smooth and clean to prevent eccentric rotation of the spindle. Spindles can

be identified by the number on the side of the spindle nut.

All Brookfield Dial Reading Viscometers are provided with a clutch lever located at the back of the

instrument. Depressing the lever raises the dial against the pointer and “holds” the instrument’s

reading. When the clutch is released the dial is lowered and the pointer will be freed.

Any of the controls on the Viscometer - the motor switch, speed change knob, and clutch - may be

operated independently of the other.

II.2 Viscometer Readings and Viscosity Calculations

1. Mount the guard leg, if used, (spindle protector) on the viscometer.

2. Attach the spindle (left-hand thread) to the viscometer lower shaft by lifting the coupling screw

slightly. Hold it firmly with one hand while screwing the spindle on with the other (note left-hand

thread). Avoid putting side thrust on the shaft.

To avoid trapping air bubbles under the disc-type spindles, do the following before attaching the

spindle. Begin by immersing the spindle in a diagonal path, slowly drag the spindle across the

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Brookfield Dial Viscometer Bedienungsanleitung Seite 5