Sealed Sensor Systems
The sensor contains either a sealed bellows or a diaphragm that serves as an isolating interface between the process media and the DPU – transmitting pressures from the process to the DPU without attenuation. The M305 (bellows) sensor is designed for mounting inside a vessel in liquid level applications. The M350 (bellows) and M422 (diaphragm seal) sensors are designed for mounting outside the vessel in level or flow measurement applications.
The capillary tubing, used to connect the sealed sensor to the DPU, has a ¼ inch outside diameter (nominal 1/8 inch inside diameter). It is available in virtually any length that can be bent, looped, or formed to fit installation requirements. Tubing is available in copper alloys and stainless steel, with joints and connections brazed or welded to prevent leaks. The tubing is filled with a fluid suitable for the intended application.
The differential pressure unit (DPU) is a rupture-proof dual-bellows unit that has built-in overrange protection for long life, stable operation, and accuracy under the most severe operating conditions.
