Figure 2-4. General layout of detonating cord firing system.

TM 9-1375-213-12-3

TO 11A20-15-1

c. Heat and Sun.

NOTE

(1) Batteries, When the daytime tem-

Extra force is necessary to push the

erature goes above +9F, use of the mercury

transmitter's fire button at extremely

battery in the receiver will generally give a

cold temperatures. If the rubber boot

longer on-duty time. Mercury batteries gener-

over the FIRE button has been cut,

ally have better high temperature characteris-

moisture can penetrate into the switch

tics than the alkaline types. Because of their

mechanism below and if it freezes,

physical differences (see para 1-11), they may

extremely high force may be necessary

not work properly with some receivers. When

to push the FIRE button.

using a mercury battery ALWAYS check out

the receiver (para 3-9) before the mission (see

Note, para 1-11). Though alkaline batteries

operate well at elevated temperatures, they occa-

b. Moisture. As mentioned above, protect

sionally leak. The leaked material can quickly

both receiver transmitter from moisture.

corrode the contacts which will break the electri-

Both components are moisture resistant and

cal connection between battery and receiver

the internal parts are protected, but the exter-

and turn off the ower (open circuit). When

nal push buttons, switches, and binding posts

this happens, the battery may still be good but

are vulnerable so special care should be taken

it can't get its power to its receiver through the

to protect them, Neither component will oper

corroded contacts. See the maintenance chap-

ate when submerged in water. If they do drop

ter (para 3-4) for corrective action.

into water quickly retrieve them and dry them

off immediately.

2-11