Cella pressure and temperature switches
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High-quality mechanical pressure and temperature switches from Cella are preferably used in process instrumentation. They open or close a circuit, depending on whether the pressure or the temperature is rising or falling. Due to the use of high-quality micro switches, the Cella instruments are notable for their very high precision and long-term stability. Furthermore the micro switches enable the direct switching of electrical loads up to AC 250 V / 20 A (while simultaneously ensuring a high switch point reproducibility). Optionally, there are inert gas-filled micro switches with gold-plated contacts available, which can be used for the switching of smaller loads.
The Cella instruments have a SIL 2 approval in accordance with IEC 61508 and are therefore particularly suitable for safety-critical applications. Pressure and temperature switches from Cella with the “intrinsically safe” (Ex ia) and “flameproof enclosure” (Ex d) types of protection are suited for use in hazardous areas. All instruments are optionally available with 2.2 test reports or 3.1 inspection certificates per EN 10204.
Cella pressure switches
Cella pressure switches with Bourdon tube or diaphragm measuring systems or with a piston with compression spring are available for gauge, absolute and differential pressure. They are suitable for gaseous and liquid, aggressive and highly viscous or contaminated media, also in aggressive ambience. All wetted materials are manufactured from stainless steel.
For applications with special requirements on the wetted parts, versions with materials from PTFE, Monel or Hastelloy are available. Optionally, the Cella pressure switches are available cleaned for oxygen service.
Cella temperature switches
The temperature switches from Cella are available for setting ranges from -30 ... +70 to 0 ... 600 °C. They are extremely robust and guarantee optimal operating characteristics and the highest measuring performances with repeatability lower than 0.5 % of span.
The process connection is made either by direct mounting or by remote mounting with capillary (max. 10 m). In principle, the operation of a mechanical temperature switch from Cella without a thermowell is possible with low process-side loading (low pressure, low viscosity and low flow velocities). However, in order to enable exchanging the temperature switch during operation (e.g. instrument replacement or calibration), we recommend to use a thermowell from our extensive thermowell portfolio.
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Mechatronic pressure measuring instruments
Mechatronic temperature measuring instruments