DC Engine Coolant Level Sensor Amphenol Casco DC Engine Coolant Level Sensor is a two-pin DC conductivity sensor designed for short-duration use at the engine start. This ECL sensor features Loctite Dri-Seal® on the threads. It offers 18PSI maximum operating pressure and -40°C to +125°C ambient temperature range. Amphenol Casco DC Engine Coolant Level Sensor is ideal for heavy truck applications.