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Pressure Switches

Dwyer Mercoid Switches:

Customers tell us that this is the best pressure switch made. The Mercoid D Series is one of the world’s broadest lines of pressure switches. Whatever your application might be, it is most probable it can be fully satisfied with a D Series pressure switch.

The D Series has extremely high sensitivity and great repeatability. The DA Models are equipped with two external adjustments, one for setting high pressure operating point, the other for setting low pressure operating point. Deadband, the difference between high and low set points, is adjustable over the full scale. The DS Models are equipped with a single external adjustment for setting operating point only. The deadband is fixed at a factory setting and cannot be altered in the field. For switches choose between the snap action switch, hermetically sealed snap action switch and hermetically sealed mercury switch.


PS1 Single Pressure Controls are designed for use on
high and low pressure applications in refrigeration and
heat pump systems. By operating a set of electrical
contacts, a pressure is kept inside a certain limit.
• Adjustable pressures and differentials.
• Narrow adjustable differential depending on model.
• Range & differential pointer in units bar and psig.
• Range & differential individually lockable by wire
• High rated SPDT contacts for all versions.
• Captive terminal and cover screws.
• Manual toggle for system checkout and override.
• Factory installed wire bridge for reduced installation
• Different pressure connections.
• Automatic and manual reset versions.
• Factory set to customer specifications.
• Different types of mounting brackets.

• SPDT switch rated for 120 VAC/240 VAC at 24 FLA
and 144 LRA.
• Agency approvals include: UL/CUL file #E85974,
VDE 0631/0660, TUV, CE 73/23/EWG,
CE 93/68/EWG.
• Low pressure and high pressure versions available
with TUV approval according to EN 12263
(supersedes DIN 32733) to meet requirements of
DIN 8901 and EN378 (super cedes DIN 8975).

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