After Operation Service

TM 5-6640-213-14

NOTE

When bombs are first immersed in the bath, an equal

amount of water will drain out overflow pipe.

Next, check the thermoregulator. Inspect the

regulator closely, observing for presence of gas

bubbles in mercury column. If bubbles or separa-

tion of mercury in column exist, heat bulb gently

until bubbles are driven up into the expansion

chamber. Cool slowly in a vertical position

allowing mercury to receed slowly to form a solid

column without bubbles or separation.

b. To calibrate the thermoregulator, immerse regulator in the

bath at a temperature lower than that at which the bath is to be

regulated. Place a calibrated ASTM No. 18F thermometer in the bath.

Bring bath temperature up to 96 degrees F to 98 degrees F, rotate the

micro-set magnetic coupler until the indicator light on the control

box is out; rotate the magnetic coupler until indicator light is on;

continue making minor adjustments until the bath temperature is

maintained at the desired temperature (100 degrees F +0.2 degrees F

or -0.2 degrees F).

After Operation Service.

(1) Lubrication. Through oil cap of stirrer meter, apply

several drops of a good grade machine oil (PEl) every 4 months.

(2) To Drain Bath. Unscrew the overflow pipe until pipe

is free. Pipe can then be lifted out of bath or pushed to the side

until all water is drained out.

(3) Cleaning.

Wipe all components with clean damp cloth.

Refer to table 4-3 for troubleshooting.

Troubleshooting.

VOLT-OHM MULTIMETER.

4-8.

Battery Replacement.

(1) Two batteries are used inside the case to supply power

for resistance measurements.

One is a 1.5 volt D cell and the other

is a 9-volt battery. When it is no longer possible to adjust the

pointer to zero for the RX1 and RX1OO ranges, replace the 1.5 volt

cell. When it is no longer possible to adjust the pointer to zero on

the RX1O,OOO range, replace the 9-volt battery.

(2) To install or replace a battery, remove the cover to

the externally accessible battery compartment by loosening the single

captivated screw. A small coin may be used to loosen the screw.

4-21