The FIRESAFE 832 combines the following features to produce a remarkably safe and reliable firing system. The modular design allows the system to be expanded from 64 to 256 shots, with the full range of features regardless of size.     45 VOLT DC FIRING Ensures reliable firing of multiple fuse heads per shot and over greater distances.   TWIN FIRING BATTERIES Full standby battery built in.   7.5 VOLT DC SYSTEM OPERATION Continuity and status indication provided by low voltage system.   TWIN SYSTEM BATTERIES Full standby battery built in.   STANDARD ALKALINE BATTERIES FOR BOTH FIRING AND SYSTEM Batteries available almost anywhere.   BATTERY CHANGEOVER SWITCHES FOR BOTH FIRING AND SYSTEM. Change to standby batteries with the flick of a switch.   BUILT IN ILLUMINATED VOLTMETER FOR BATTERIES. Test battery voltage at any time.   SEPARATE BATTERY FOR METER OPERATION Meter uses its own power supply, not dependant on system battery.   SYSTEM KEY SWITCH   FIRING KEY SWITCH Separate firing key allows for testing of system and firing circuits with System Key whilst firing is disabled.   KEYS ONLY REMOVABLE IN "OFF" POSITION   BOTH KEYS MUST BE INSERTED AND ON TO FIRE   SAFETY SWITCH (DEAD MAN SWITCH)   PROBE FIRING   HIGH INTENSITY INDICATOR LED'S Maximum visibility with minimum current. Longer battery life and lower test current.   NICKEL PLATED FIRING CONTACTS Corrosion resistant and high conductivity.   RUBBER CAPPED SWITCHES   LED INTENSITY SWITCH SELECTABLE PER MODULE   OFF SWITCH PER MODULE   FIRING PROBE CONTACT HOLES BEVELLED Probe will slide to contact at bottom of hole even if inserted slightly off centre.   MODULAR DESIGN   AIR TIGHT PELICAN CASE   SAFE/ARM SWITCH PER FIRING CIRCUIT Safe position provides stray current protection to cct. No need for shunting plugs on cable.   SEPARATE LED INDICATION PER FIRING CIRCUIT OF SAFE POSITION   SEPARATE LED INDICATION OF FIRING CIRCUIT CONTINUITY IN ARMED POSITION PER CIRCUIT LED will only light if cct continuity exists.   SEPARATE DIODE PROTECTION PER FIRING CIRCUIT Each firing cct is protected by multiple diodes to protect against stray currents.   HEAVY DUTY POWER DIODES USED THROUGHOUT   ALL LEDS PROTECTED BY TRANSPARENT MYLAR SCREEN   PRINTED CIRCUIT BOARDS USED THROUGHOUT Providing high reliability and no wires to short out.   MACHINE SOLDERED   37 PIN D CONNECTOR ON MODULE FIELD REPLACEABLE   ON BOARD SYSTEM VOLTAGE REGULATOR PER MODULE   LED INDICATOR FOR VOLTAGE REGULATOR FAULT PER MODULE   ALL CIRCUIT BOARDS SPRAY SEALED   ONLY TWO WIRES REQUIRED PER MODULE TO CONNECT TO MAIN SYSTEM PANEL   BUILT IN OHM METER TO MEASURE FIRING CTT RESISTANCE