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The liquid level sensors are all manufactured from stainless steel, with an integrated military specification D38999 connector. Varying in length between 125mm and 580mm, they have been developed for inverted mounting with an M22x1.5 mounting thread and a designed life expectancy of 30 years.
Sealed to IP67 and with an operating temperature range of -40°C to +125°C, the sensors also conform to severe environmental and Defence Standard EMC tests.
Another key challenge for all the sensors was the requirement for the negative supply and signal to be fully isolated from the sensors metal housing and able to withstand a 28V positive supply to the housing and sensor probe.
Of the three non-contact linear position sensors, two are adaptations of the Blade25 and Blade60 position sensor range. With heavy duty wiring and Mil-Spec connectors added, the standard product proved adept at coping with the tough environmental standards and operating conditions.
The third non-contact induction sensor was designed specifically to measure the position of the final drive secondary brake release mechanism. The dual purpose sensor measures the wear of the brake pads and the state of the secondary brakes (applied/released).
Having a measuring range of 5mm with an accuracy of +/-0.1mm, the Pulse Width Modulation (PWM) output voltage range was 0>4.2V with an output range of 10% to 90%.
Once again a life expectancy of 30 years was specified with an IP67 rating and -40°C to +125°C operating temperature range. As with all the other sensors, stringent environmental and Def-Stan EMC test limits are complied with.