These instruments are designed to keep under control the level of a fluid, liquid or gaseous, within vessels; they can be defined as :

• Indicators. They show the level of a liquid very clearly on their outside linear display. They can be completed with two important accessories : a Linear Sensor able to remote transmit an electric signal being proportional to the level; one or more Alarms able to give an electric or pneumatic signal when liquid reaches the max or min or any intermediate level.

• Switches. They give an electric or pneumatic signal when level reaches the preset level : max, min, etc.

• Regulators. They perform a pneumatic signal able to self-regulate loading/unloading of vessel on basis of the existing level. In these instruments the liquid and its fumes are sealed in their tight space and never come into contact with the output device : in fact the float movement is transmitted from liquid to output device only by means of magnetic field. In this way no risk of dangerous gas explosion exists. Since these instruments operate within areas with risks of explosions, they are able to assure high specific performances :

• Their chamber/body is designed in conformity of the ASME standards and in different thickness, according to the pressures and temperatures of the liquid to be controlled.

• Their connection and inspection flanges are in conformity of the ASME B16.5 standards in the ratings ANSI 150÷2500psi, or in conformity of UNI/DIN standards.

• Their housing with electric output is flame-proof, EEex dc IIC T6, with Certificate EN 50018-1994.

• Their housing with pneumatic output is water-proof.

• The instruments are produced in conformity of the PED 97/23/CE and ATEX 94/9/CE Standards : page 37.

• The instruments are in production since 1971by Domizi Snc, a company certified ISO 9001-2000.