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Figure 2-22. Fume Hood (Unit No. 19)
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TM-5-6640-214-14 Petroleum Base Laboratory Assembly NSN
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Figure 2-23. Low Temperature Kinematic Viscosimeter Cabinet (Unit No. 20)
TM 5-6640-214-14
2-23. LOW TEMPERATURE KINEMATIC VISCOSIMETER CABINET.
a. Component Parts. The low temperature kinematic viscosimeter cabinet (fig. 2-23) contains the bath, control
panels, and a refrigeration unit. The kinematic viscosimeter bath consists of an evacuated Dewar jar, thermoregulator,
heater, stirrer motor, and lights. One control panel, containing the bath heater switch and pilot light, is mounted at the
rear of the bath on the elevating platform. It also serves as a splash guard. A second control panel, mounted at the top
right front of the cabinet, contains the powerstat, selector switch, mercury switch bulb, toggle switch for compressor
motors, toggle switch for bath lights, and electronic relay. The refrigeration unit consists of three motor compressors, a
condenser assembly, and a fan and motor assembly.  The high compressor is filled with 3 pounds (1.36 kg) of
Refrigerant -12; the intermediate compressor, with 10 ounces (283 gm) of Refrigerant -22 and the low compressor, with 2
ounces (56.6 gm) of Refrigerant -22.
b. Operation. Make certain that elevating platform is properly raised and locked in position. Connect powerline of
apparatus to power source. For detailed directions for assembling apparatus and preparing samples, and for information
on testing procedures, consult the appropriate test methods in test reference.
c. Preventive Maintenance. Preventive maintenance consists of defrosting the ice cube compartment, lubricating
the fan motor, and checking lines and fittings.
2-24. REFRIGERATOR CABINET.
a. Component Parts.  The refrigerator cabinet (fig.  2-24) consists of a storage compartment, ice cube
compartment, and motor compartment. The cold storage compartment contains the thermostat control; the ice-cube
compartment contains 12 ice cube trays; and the motor compartment contains the condensers, controls, relays, and
power cord.
b. Operation. Set the temperature control in the motor compartment to desired temperature and connect power
cord to power source. Refrigeration unit is designed for continuous automatic operation.
2-25. CLOUD- AND POUR-POINT APPARATUS CABINET.
a. Component Parts. The cloud- and pour-point apparatus cabinet (fig. 2-25) consists of a bath compartment and
motor compartment. The bath compartment contains five bath units: +30 degrees F (1.1 degrees C), 0 degrees F (-17.8
degrees C), -30 degrees F (-34.4 degrees C), -60 degrees F (-51.1 degrees C), and -90 degrees F (-68 degrees C) baths.
The bath openings in the cabinet top are equipped with sliding covers. Two hinged doors at the front of the cabinet
permit access to the bath compartment. Components contained in the motor compartment area motor compressor
containing 9 pounds (4.09 kg) of refrigerant -12, a condenser, and thermostats for the +30 degrees F, 0 degrees F, and -
30 degrees F baths; a precooler motor compressor
2-42

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