In operation, smoke or dust particles blown into the sensing chamber, cause a change in resistance. This is then translated by circuitry to output a detonating signal.

Operates on the change in light intensity. Unit uses a light-sensitive photocell which produces a constant electrical resistance.

When light intensity is increased, resistance is changed and the detonator is initiated.

In ITA-111, the circuitry is designed so that it triggers when the circuit board (and improvised explosive device) are moved from a location where the light is bright, to an area of reduced or subdued light, shadow or darkness. The light level drop can be set using the two sensitivity settings. They have been factory set for normal room light at our location but may have to be reset by you. It is recommended that you make a sketch of the adjusting screw slot position on each of the two potentiometers (variable resistors) before any adjustment is made. Otherwise, you may have trouble returning to the factory setting.

Designed to initiate a detonator when the room being monitored is entered. This device senses heat movements, changes.

Humidity sensor. Uses commercial humidity sensor and is designed to initiate detonator as relative humidity changes.