Modus Instruments W Operating Manual

GE

Sensing

Modus W Series

Modus W Series is a General Eastern
product. General Eastern has joined
other GE high-technology sensing
businesses under a new name—
GE Industrial, Sensing.

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General Eastern Liquid
Differential Pressure
Transmitters

The Modus W Series pressure transmitters are designed
to measure low differential pressures of liquids or gases.
A wide selection of standard pressure ranges and
electrical ratings is available.

These transmitters feature no moving parts to wear out,
a proven long term stability of piezoresistive devices, only
316 stainless steel in contact with the fluid, and an
all-welded construction.

Modus W Series transmitters are an excellent choice for
many HVAC, process and automation monitoring
requirements. Typical applications include measurement
of differential pressure across flow elements, heat
exchangers, pumps and filters, liquid level monitoring
and other demanding differential pressure measurement
and control applications.

The transmitters are housed in a compact, heavy duty,
gasketted, cast aluminum enclosure designed to IP 65 of
IEC 529 standards and Type 4. The die cast aluminum
enclosure incorporates a recessed neoprene gasket to
prevent the 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 electrical terminals are made through
knockouts on the front of the box. A choice of two
knockouts and three hole sizes are available to
accommodate usage of 0.5 in (12.7 mm) conduit or
metric sizes PG11 and PG13.

Pluggable terminal block connectors are provided with
wire protection and captive terminal screws.

The Modus W Series includes one model: Model W30.

This model is available with the following power and
signal configuration

Model W30

• Two-wire

• DC Voltage In

• 4 to 20 mA out

The span or zero adjustment is performed with a 20-turn
potentiometer for fine resolution. A 50% adjustment in
output is possible.

The Series W transmitters comply with the European
requirements of Council Directive 89/336/EEC.

GE

Sensing

Operation

The pressure transmitter consists of two high accuracy
piezoresistive sensors with stainless steel isolation
diaphragms. Both sensors measure static pressure, and
the difference between these two measurements is
computed electronically. The use of high accuracy and
stable sensors makes this measurement possible. Since
each sensor measures the full static pressure, there is no
possibility of over-pressurizing the transmitter if one
sensor is disconnected from the line. No complex and/or
expensive balancing valves are needed.