Specifications

ZERO180 Gun SystemZERO180 Gun System

3.15 The next step is to install select-re tandem sub at bottom of gun. This system requires a

select re tandem at the bottom of each gun. Place the size 230 o-rings on the sub. Pass the

thru wire through the tandem. Insert the tip of the end seal or booster into the 9/16” ID hole in

the tandem sub.

Warning:

 Ifanydifcultyisencounteredwhileinsertingthe

tandemsub,STOPandcheckforthecauseofthedifculty!If

necessary, remove the tandem sub from the gun body and determine

the problem! Never beat or force the tandem sub into the loaded tube

strip into a carrier!

Apply grease to threads and o-rings of the sub and thread it into carrier. Before the second

o-ring engages during assembly, verify the end seal or booster has moved along the 9/16” ID

by feeling for it with a nger through the port. Once veried, nish threading the tandem and

tighten the sub while pulling out the slack in thru wire from bottom of sub.

3.16 Rotate the gun string assembly on the workbench where the port in the tandem sub is visible.

From inside the port, grab the thru wire and pull it back thru the port.

3.17 Attach a ground wire to the tandem sub in the bottom of the port. Cut a minimum of 12” piece

of 22 gauge buss wire (bare, non-insulated wire).

O-ring method: Coil 6” of the bare wire around the cross section of a size 216 o-ring leaving

approximately 6” of bare wire for making a ground connection to detonator while arming.

Snap ring method: Coil 6” of the bare wire around the cross section of a size 0125 internal

snap ring leaving approximately 6” of bare wire for making a ground connection to detonator

while arming.

3.18 Insert the o-ring or snap ring into the bottom of the port and allow the free end of the wire to

exit the port.

3.19 Choose the appropriate polarity pressure switch or dual diode and pass the wires into the sub

and out the port. Apply minimal grease to the o-rings of switch/diode and seat it in in place

with care not to push on switch pin or not to pinch wires.

3.20 Electrically connect and insulate the thru wire of the gun to the input wire of the switch/diode

(yellow for switch and white for diode). Keep the wires as short as possible to allow room for