The Fluid Transfer Interlock Monitor incorporates ten large, high intensity LED’s that inform the operator which interlocks
are open. The Interlock Monitor separates the interlock system into ten parallel circuits, each circuit being electronically
monitored. When the circuits are ‘opened’, (equipment removed from stowage) the unit changes the colour of the circuit
LED from green to red. The unit ensures that the vehicle brakes are applied until all switches are ‘closed’ (equipment
cor- rectly stowed).
The current in the interlock circuits is limited to intrinsically safe levels such that no sparking can occur if a wiring
fault develops. The use of dual colour LED’s eliminates the possibility of the true state of a circuit not being shown
due to a failed LED or lamp.
The unit can be easily retrofitted to vehicles that are fitted with electrically actuated brake interlock systems using
interlock switches which are ‘closed’ when the equipment is stowed and which have been wired through a central
junction box. The links in the junction box are removed to make the circuits parallel, a multi-core cable is installed
between the junction box and the cab where the monitor box is mounted in view of the driver. The interlock monitor is
then linked to the relay con- trolling the solenoid valve in the brake line.