Pressure switch made by Sirai.
CE-cURus approved
ISO 228 G connection 1/4"M for pipe ø 4x6 mm
adjustable scale 0.5÷1.4 bar
fixed differential 0.18 (± 0.03) bar
fluid temperature max :140°C
max contact load 20A
GENERAL FEATURES
This switch is designed so as to open a two-pole electric circuit when the
pressure in the system rises and to close it when the pressure
decreases. Designed for electric boilers of coffee machines as main application.
In conformity with EU Directive 2011/65/EC (RoHS 2 Directive)
PROTECTION DEGREE
IP00
AMBIENT TEMPERATURE
80°C max
CALIBRATION
The pressure switch can be adjusted at will at pressure value “P”: in this way
the opening pressure (P+-P) is set.
The P setting is made by the bushing “B” as shown in the section overleaf:
each clockwise turn of the screw is about 0,025bar. The p value is pre-fixed and understood as the differential of the pressure switch. Once the adjustment is made, the pressure switch closes the circuit at pressure “P” and opens it at pressure “P+-P
TECHNICAL FEATURES
Housing and cover in fibreglass reinforced PBT (Polybutylene- terephtalate).
Both supporting plate and main lever are in zinc plated steel. A diaphragm
in PTFE (polytetrafluoroethylene) backed by a diaphragm in FPM
(fluoro-carbon elastomer) is the sensing element wetted by the medium: it
can withstand overpressures equivalent to max. pressure plus about 50%.
Snap action switch is vibration resistant type.
Silver contacts with double break for each phase. Diaphragm housing in forged brass with pressure intake for bi-conical connection.
