The GE General Eastern Modus M Series family of differential pressure transmitters measure low pressures and feature a wide variety of analog signal outputs with low power consumption. A wide selection of standard pressure ranges and electrical ratings is available to the GE General Eastern Modus M Series' different pressure transmitters.
These pressure transmitters feature: no moving parts to wear out, reliable long term stability, and are virtually position insensitive. The GE General Eastern Modus M Series' pressure transmitters are typically used for monitoring cleanroom pressures, HVAC, velocity pressures, bubbler level systems, and leak detection; as well as filter differential, draft, fume hood and other low pressure applications.
The GE General Eastern Modus M Series' pressure transmitters are housed in a compact, heavy duty gasketted cast aluminum enclosure designed to IP 65 of IEC 529 standards and NEMA 4. The die cast aluminum enclosure incorporates a recessed neoprene gasket to prevent ingress of moisture or dust. Wall mounting holes are enclosed in the cast aluminum box and concealed by the cover. The wall mounting holes and the cover attaching screws are outside the gasketted area. Access to the terminals are made through a knockout on the front of the box. One knockout is standard with three hole sizes available to accommodate usage of 1/2 inch conduit and metric sizes PG11 and PG13.
Pluggable terminal block connectors are provided with captive wire protection and captive terminal screws.
Operation of GE General Eastern Modus M Series' Pressure Transmitters
The pressure sensing element is a differential capacitance cell for pressure measurements ranging from 0.1 to 5 inches of water (25 Pa to 1.0 kPa), or piezoresistive (silicon) sensors for pressure measurements ranging from 5 inches of water to 30 psi (1.0 kPa to 200kPa).
The capacitance cell is capable of sensing very low pressures, negative or differential pressures. A very lightweight, responsive diaphragm within the cell deflects a small amount when a small pressure is applied. This deflection results in a change in capacitance which is then detected and amplified electronically.
The piezoresistive sensor is a solid state device designed in a Wheatstone bridge configuration. When pressure is applied to the device, the resistance of the bridge changes by a small amount. The output of the bridge is ratiometric to the supply voltage, and a small change in resistance is detected as a change in output voltage.