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Section 3 - Maintenance
The operating life of the consistometer can be extended measurably if operating and
maintenance instructions provided in this manual are adhered to. Avoidance of down time
and parts replacement depends on the proper cleaning, lubrication, replacement of filters, and
calibration of instrumentation and controls. The following procedures will correspond with
the maintenance schedule time intervals included in this manual.
Chillers
Instruments using a chiller sometimes produce condensation when used. The use of a fan or
air-conditioned environment will help in keeping the moisture level lower. Wipe away any
condensation that may occur inside the cabinet.
After Every Test
Pressure Cylinder
1. Inspect and replace the O-ring on the cylinder plug if cuts, damage, or imbedded particles
are present. If none of these conditions are noted, wipe the O-ring and the plug groove
free of cement particles or other foreign matter and lubricate the O-ring with a light film
of grease or oil.
2. The thread of cylinder plug has been lubricated with molybdenum disulfide grease by the
factory. If molybdenum disulfide grease is not immediately available, a mixture of white
lead and lubricating oil will be a satisfactory substitute.
Potentiometer Mechanism
The potentiometer mechanism (pot mech) must be cleaned after every test. Using a nylon
brush, lightly brush down the unit with mild dish washing soap. Clean all cement sediment
from the contact springs, resistor, and exterior surfaces. Rinse the assembly thoroughly with
water. Apply a light coat of mineral oil to the resistor surface and bearings to prevent
oxidation.
Slurry Cup
All components of the slurry cup must be cleaned and inspected thoroughly after every test to
ensure proper operation of the consistometer.
1. Inspect the plug for any wear such as dishing or rounding out of the inner taper.
Excessive wear of the tapered seat will prevent the proper centering of the paddle shaft
and result in binding the paddle to the interior wall of the slurry cup.
2. Inspect the shaft tip for wear and ensure that the shaft is straight. Excessive wear of the
sharp tip or a bent shaft will prevent the shaft from centering in the cup base plug. Either
of these conditions will result in binding of the paddle to the interior wall of the slurry
cup. Inspect the shaft that is in contact with the diaphragm, replacing when worn.
3. Replace the paddle any time damage such as bent or broken vanes exists. The paddle
weight should be recorded before the first use. Weigh the paddle after every 20 tests.
When the original weight of the paddle has dropped by 20%, replace the paddle.
SECTION 3 – MAINTENANCE
3-1
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