Double level pressure switch for gas
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Double level pressure switch for gas

The pressure switches of series 5-1648-0-* are engineered to keep under control the pressure of SF6 gas inside middle voltage switchgears. These pressure switches are double switching level type and are therefore suitable for the monitoring of two different levels of pressure. This feature allows to manage a first alert level under which to foresee a gas filling up inside the switchgear, and a second intervention level over which the switchgear is put in emergency protection. The switchgear must also be provided of a pressure connection with male thread 1/4” BSP suitable to hold the...

Contrarily to the normal pneumatic pressure switches, this system is equipped with a sophisticated expansion system through metallic bellow which grants a nearly unlimited life avoiding the performance deterioration typical of other systems like, for instance, devices with nitril membrane. Functioning scheme The image represents the functioning diagram of the pressure switches of series 51648-0-*. The left part represents the area in contact with gas, the central part represents the microswitches while the right part represents the calibration spring which sets out the intervention levels...

Principle of functioning The principle of functioning of a pressure switch is that a gas under pressure develops a thrust of given entity if applied to a mobile element of known section. This thrust is proportional to the pressure applied on the section in question. If such thrust is opposed to a spring which has its force calibrated on the pressure willing to be monitored, the result will be that at reaching of the determined calibrated pressure, the switching of the electrical contact installed on the pressure switch will occur. Functioning of the pressure switch The system shown in the...

Overall dimensions The figure represents the outer view with the overall dimensions of the pressure switch code 5-1648-0-*. The device is fixed to the host structure by means of a thread 1/4” BSP female, obtained on the lower side of the device. On the same side an OR gasket in nitrile rubber is assembled for front holding. The lower part of the pressure switch, as well as the bellow, are made of stainless steel while the housing is made of anodized aluminium. The outer protection class of the pressure switch body is IP 42.

Technical Data’s MECHANICAL FEATURES Body Threaded connection Limit of mechanical resistance Max working pressure Max hysteresis Operating temperature Clamping torque Anodized aluminium Stainless steel 30 bar 5 bar 30% of calibration value -40/+85 °C 25 Nm Max ELECTRICAL FEATURES Max commutable tension Max commutable current Protection class Electrical connection Electrical scheme TECNOFLUID ENGINEERING srl Via Dei Mille, 1 20031 CESANO MADERNO (MB) TEL. 0362.645981 FAX 0362.645999 e-mail: info@tecnofluid.info http: www.tecnofluid.info