Double level density switch for gas

The density switches of series 5-1782-0-* are substantially pressure switches with double level temperature compensated, engineered to keep under control the pressure of SF6 gas inside middle voltage switchgears. These density 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...

Thanks to its structural features, this density switch grants the correct functioning of the device even in particularly unfavourable environment conditions, keeping the setting parameters practically unchanged independently from the temperature and pressure variations. This device is therefore suitable for use in environments with extremely different temperature ranges and/or high altimetry. Functioning scheme The image represents the functioning diagram of the pressure switches of series 5-1782-0-*. The left part represents the area in contact with gas, the central part represents the microswitches...

Principle of functioning This density switch is characterized by an element sensible to pressure which is placed in contact to the gas section of the circuit to be monitored, it is composed of one bellow rigidly connected to a second bellow exposed to atmosphere pressure. The two microswitches of the device are positioned between the two elements sensible to pressure. Placing the sensible element in contact to atmospheric pressure renders the device insensitive to variations of both temperature and environment pressure, allowing the reading of the switching pressures at absolute level. Functioning...

Overall dimensions The figure represents the outer view with the overall dimensions of the pressure switch code 5-1782-0-*. 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 bellows, are made of stainless steel while the housing is made of anodized aluminium. The outer protection class of the pressure switch body is IP 54.

Technical Data’s MECHANICAL FEATURES Body Threaded connection Limit of mechanical resistance Max working pressure Tolerance on calibration Operating temperature Clamping torque Anodized aluminium Stainless steel 30 bar 5 bar +/- 0.05 bar -25/+85 °C 5÷10 Nm 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: [email protected] http: www.tecnofluid.info