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Published on: Jun 12, 2017 NEMA is an acronym for National Electrical Manufacturers Association. This organization gives electrical component enclosures ratings — such as NEMA 4X — based on their protective qualities. NEMA ratings specify whether an electrical component enclosure is…

Published on: Jun 12, 2017 It is often difficult and confusing for engineers to know what type of rating they need to look for when they desire to have a “waterproof” enclosure.  There is a big difference between waterproof, water resistant,…

Published on: Jun 12, 2017 HAZARDOUS AREA SENSORS CERTIFICATION Thermocouples and RTD Sensors are a source of Ignition Electrical equipment including temperature sensors for use in Hazardous Areas needs to be designed and constructed in such a way that it will…

Published on: Jun 12, 2017 Explosion Proof classification for a sensor/transmitter means that the housing has been engineered and constructed to contain a flash or explosion. Such housings are usually made of cast aluminum or stainless steel and are of sufficient…

Published on: Jun 12, 2017 ...likewise, no system is explosion proof if it contains non-explosion proof components. Instrument engineers are responsible for providing safe and appropriate instrumentation. To declare a system safe, simply because a single component is approved, is dangerous…

Published on: Jun 12, 2017 Installing a temperature sensor in a hazardous location requires more than an approved explosion proof connection head. To meet the safety requirements of FM, you must consider the complete system: including the sensor, the thermowell (if…

Published on: Jun 12, 2017 A thermocouple consists of two dissimilar conductors in contact, which produce a voltage when heated. The size of the voltage is dependent on the difference of temperature of the junction to other parts of the circuit.…