(1) Before-operation services.
(a) Assure that the overflow pipe is tight and fill
the bath with water up to the level of the overflow pipe. The
position of the overflow pipe is set to maintain the level of the
water at least 1 inch (25.4 mm) above the immersed bomb. as specified.
by ASTM D323.
(b) Check the thermo-regulator for the presence of
gas bubbles in the mercury column. If bubbles are present or the
mercury in the column is separated, heat the bulb gently in a beaker
of water or oil until the bubbles are driven up into the expansion
chamber. Cool slowly in a vertical position, allowing the mercury to
recede slowly to form a solid column without bubbles or separation.
(2) After-operation services.
(a) To drain the bath, unscrew the overflow pipe un-
til it is free; lift the small pipe out of the bath or push it to the
side until all the water is drained out.
(b) Wipe all components with a clean, damp cloth.
(3) Lubricating. Through the oil cap of the motor, apply
several drops of a good grade machine oil, such as PE1, every 4
(4) Calibrating the thermoregulator. To calibrate the
thermoregulator, immerse the regulator in the bath at a temperature
lower than that at which the bath is to be regulated. Place a
calibrated ASTM D323 No. 18F thermometer in the bath. Bring bath
temperature up to 96 degrees F to 98 degrees F (35.6 degrees C to
36.7 degrees C), rotate the micro-set magnetic coupler until the
indicator light on the control box is out; rotate the magnetic coupler
until the indicator light is on; continue making minor adjustments
until the bath temperature is maintained at 99.8 degrees F to 100.2
degrees F (37.5 degrees C to 37.8 degrees C).
b. Troubleshooting. Table 3-5 is a troubleshooting chart for
the Reid Vapor Pressure Apparatus.
a. Cleaning. Clean the glass tube, when necessary, to remove
deposits of oxidized mercury from the interior surface. Drain the
mercury and remove the top and bottom plugs on the tube. A suitable
brush with either naphtha or acetone moved rapidly up and down in the
tube will provide efficient tube cleaning. Refill the manometer,
reservoir with clean mercury. Refer to instructions on filling the
reservoir (para. 2-2, f. (4) (b) 4).