Pressure Switch P77

The P77 series pressure controls may be used for control functions
or limit functions, depending on model number.

Product Description

All models are provided with alarm contacts. All standard models have  phosphor bronze bellows and brass pressure connections.
Models for use with ammonia are provided with stainless steel bellows and connectors.
Devices conforming to PED 97/23/EC Cat. IV (HP models) have the fail-safe function with double bellows.
Their IP54 classification means that these pressure controls are suitable for almost all applications.

Features
•Generous wiring space
•Splash-proof enclosure (IP54)
•SPDT contacts are provided as standard on single pressure controls.
•Trip-free manual reset
Application
These pressure controls are designed for use in a variety of applications
involving refrigeration high or low pressure.
Models supplied have a “whole range” design, enabling them to be used
with refrigerants R22, R134A, R404A, R410A, CO2 and all other
non-corrosive refrigerants which are within the operating range
of the control. They may also be used for other high or low pressure
applications such as air, water etc. Models which can be used
with ammonia are included in the program. Also models tested
and approved to PED 97/23/EC Cat. IV (supersedes DIN and TUV approval)
are included in the program.

Technical Document