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Differential Pressure is sensed by the movement of a precisely
ground floating piston/magnet in a precision bore against a
calibrated spring. Any variation in pressure on either side of the
piston/magnet will cause the magnet to move proportionally to the
change in differential pressure. A rotary pointer magnet located
close to the internal magnet, but outside the pressure housing,
follows the movement of the piston magnet and indicates differential
pressure on the dial. Piston-Type Differential Pressure Gauges are
available with one or two hermetically sealed reed switches. The
switches are adjustable within a defined percentage of the full
scale range of the gauge and are available in SPDT and SPST,
normally open or normally closed configurations for various
load/power ratings. The switches can be set to activate or
deactivate on rising or falling pressure. Switches are "CE" marked
per the EU low voltage directive.
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Differential
Pressure is sensed by the movement of an elastomer diaphragm against a precision
calibrated range spring. The change in position of the diaphragm in
response to the change in Differential Pressure moves an internal
magnet. This magnet, in turn, causes a rotary magnet external to the
gauge body to rotate. This rotary magnet has a pointer attached
which indicates the differential pressure on the dial. Diaphragm-type Differential Pressure Gauges are
available with one or two hermetically sealed reed switches. The
switches are adjustable (see table for the adjustment range) within
a defined percentage of the full scale range of the gauge and are
available in SPDT and SPST, normally open configurations for various
load/power ratings. The switches can be set to activate or
deactivate on rising or falling pressure. Switches are “CE” marked
per the EU low voltage directive.
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The Model 105/106/116 bellows
design provides a simple, compact, accurate, direct-acting, low range
differential pressure indicator. The Model 109 encapsulated
Bourdon tube design provides a simple, compact, and accurate differential
pressure indicator.
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Mid-West Instrument has been designing and manufacturing
indicating differential pressure switches for use in Hazardous Locations
for over 30 years. Their products carry CSA, UL, and or ATEX
certifications that apply to the entire assembly as mandated by the
applicable Hazardous Locations Standards. In order to mark their product
with the CSA & UL marks, Mid-West Instrument is subject to unannounced
visits by personnel from each certification lab 4 times per year. In
addition, for the ATEX certification, they are subject to a comprehensive
audit from a Notified Body representative once every
year.
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“O.E.M.” Indicators &
Gauges sre competitively priced Differential Pressure Indicators, Gauges &
Switches for the O.E.M customer. Housings available in Glass reinforced
Plastic, Aluminum and Stainless Steel. Working pressure of 300, 1,000 and
3,000 PSIG.
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VERIS Verabar
Averaging Pitot Tubes and VERIS Accelabar Flow Meter. Mid-West Models
105, 106, 130, 140, and 142 Differential Pressure gauges are all available
with Flow Dials.
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The Model 150 “Vari-Damp®” all purpose pulsation dampener
features both a fine thread needle valve for adjusting dampening
characteristics and a Precision Controlled
Flow Rate Ball Check to block line surges, shock waves, or
fluid hammer. The Model 200 “Gauge Minder” features a pressure limiting valve
that blocks off excess pressure to the instrument, preventing
calibration failure, internal damage, and “blowout” from
over-ranging - a principal cause of instrument failure.
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