differential pressure switches, pressure switch, pressure indicators, pressure devices

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Indicators

MICRO DELTA® differential pressure devices sense the differential pressure directly across the filter element. At a preset limit, the indicator will actuate, signalling the need to change the filter element. This permits maximum use of the element, requiring element changing only when the full dirt holding capacity is reached, rather than changing elements on a periodic time basis which may result in premature disposal of "still useful" elements. Microdelta differential pressure devices actually reduce plant operating costs by signalling the need for element replacement only when the elements have removed their designed dirt holding capacity.

Features/benefits:
Magnetically operated
Microdelta® differential pressure devices utilize a magnetically operated actuation mechanism to indicate when the preset element differential pressure has been reached. The magnetically attractive forces act through solid metal walls of the indicator housing precluding the need for external dynamic seals and their associated fluid leakage paths. Rare earth magnets are used in Microdelta differential pressure devices for their strong magnetic forces and good shock and vibration resistance.

No downstream leakage
Microdelta differential pressure devices utilize an internal seal on the pressure sensing piston, separating the fluid upstream of the

filter element from the downstream fluid stream, thereby preventing bypass leakage which could permit contamination to pass downstream and cause "silting" of the indicator sensing mechanism.

Thermal lockout available
At start-up, hydraulic fluids are cold and more viscous, causing a higher initial AP across the filter element. An optional thermal lockout is available to prevent false actuations at cold start. There is no indicator actuation below 85°F (29°C), the indicator is in transition between 85°F and lOOT, and there is positive indication above 100°F (38°C).

Electrical indicator with three wire leads
Provides a 1/2" NPT connection to facilitate making a junction with three wires to carry an electrical signal to a remote location. Frequently used when a connection to a remote sensing device, alarm, horn or light is desired.

Electrical indicator with DIN 43650 connector
Accepts DIN conduit to facilitate making a junction with three wires to carry an electrical signal to a remote location. Frequently used when a connection to a remote sensing device, alarm, horn or light is desired.

Visual indicator with and without thermal lockout
The pop-up indicator extends a red button approximately .200" to indicate that the element is clogged or that the set differential pressure has been exceeded. The button will remain extended until a clean element is installed and the button is manually reset.

Additional information can be downloaded in Adobe PDF format:
Differential pressure indicator devices (4 pages, 857kb)
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