TM 5-6640-212-14
5-3. Utility Oven.
5-4. High Pressure Purge Meter.
a. Thermostat Removal.
(1) Remove screws and saddle clamps which hold
a. Removal and Installation.
Meter must be
sensing bulb of thermostat in place on bottom of working
mounted in vertical position (6, fig. 2-10) with inlet of
chamber.
meter facing vertically downward and outlet of meter
(2) Carefully lift sensing bulb to a perpendicular
facing in a horizontal direction. The reading extension
position with diffuser panel.
can be rotated in any direction by loosening cap nut at
(3) Pull off reference dial.
top and turning reading extension manually.
b. Maintenance. Meter need not be removed from
(4) Lay oven cabinet on its side.
line for cleaning. The meter body is of a single piece
(5) Remove screws securing thermostat to rear of
construction and is coupled to reading extension by
oven control panel and disconnect electrical connections
means of a screwed adapter with an O-ring seal. By
to thermostat.
removing reading extension, the metering plug,
(6) Withdraw thermostat capillary out through
compression spring, and orifice can be removed and the
bottom of working chamber.
indicator housing can be disassembled. Refer to the
CAUTION
exploded view, figure 5-6. Care should be exercised in
Do not crimp or sharply bend
handling plug and orifice since damage could result in
capillary tubing.
malfunction or complete failure of meter.
b. Heater Bank.
c. Checking and Adjustment.
(1) Remove screws and saddle clamps which hold
(1) Orifice should be seated properly during
sensing bulb of thermostat in place on diffuser panel on
assembly.
bottom of working chamber.
(2) Magnetic follower and extension should be free
(2) Carefully erect sensing bulb to a perpendicular
from foreign matter to permit maximum freedom of
position with diffuser panel.
motion.
(3) Lay cabinet on its back and withdraw capillary
(3) Indicating scale can be adjusted by means
from inside working chamber out through bottom of
of an assembly screw on the mounting brackets.
working chamber.
5-5. Kinematic Viscosity Baths.
CAUTION
a. Removal.
Do not crimp or sharply bend
(1) Remove one of the circular bakelite cover and
capillary tubing.
cup assemblies and drain bath of all its white technical
(4) Stand oven in an upright position and lift out
oil.
diffuser panel. Disconnect electrical connections from
CAUTION
three buss bars of heater bank.
Be sure power is removed from bath.
(5) Remove four screws securing heater to bottom
If operated without oil, heaters will
of oven and lift out heater assembly.
burn out, or if used with water in the
c. Pilot Light and Switch.
bath, heaters will short out.
(1) Lay oven on its side, compress spring clips at
(2) Remove bayonet-type connector leading from
each side of switch and push out through front of oven
base of unit over top of controller. To remove turn
counterclockwise and pull up.
(2) Disconnect wires from defective part.
(3) Unscrew protective guard and carefully slip
d. Installation.
Install components removed in
thermoregulator up and out of protective guard.
reverse order of removal. Refer to figure 5-5 for wiring
(4) Remove thermoregulator from base and
data.
control unit and carefully lift out the outer plastic
enclosure as well as inner glass enclosure.
5-8
