Level Sender Uses Piezoresistive Silicon Sensor

Fozmula has extended its range of liquid level senders with the T/LL200 series hydrostatic-based sender. When designing this sensor, Fozmula used a differential pressure measuring method rather than the absolute pressure measurement method because it was seen to offer less potential opportunities for error. Additionally, the 4-20mA industry-standard output was selected together with 0-5V as an alternate. The T/LL200 employs a high-accuracy piezoresistive silicon sensor and is not adversely affected by fluid temperature. The sensing element, mounted in a stainless-steel housing that acts as both protection and a sinker weight, has to remain at the bottom of the tank to provide accurate readings.

Connecting the sensor to the outside of the tank is done via a small capillary tube that can avoid any internal obstructions in the tank, such as supporting baffles. The tube terminates into a custom moulded header. This header offers a selection of mounting thread sizes or an SAE 5 holes flange. Designed largely for use in static fuel tanks, the sender can operate at up to 4m in depth and is individually factory calibrated to its tank. The T/LL200 is constructed of stainless steel, nylon 6 and polyurethane, allowing it to be used in a wide range of different fuels.

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