Power Supply Used for IS Instrument

All this informative stuff comes with the instrument in the Application Notes or the User Manual. If one is not to hand, telephone the instrument manufacturer for advice on obtaining a copy.

It isn't the instrument that is intrinsically safe; it is the installation. IEC60079 refers. If the design wherewithall is not to hand, hire it.

Is it possible to take Power supply of 24VDC to an Hazardeous area? If it can be, wont it be able to create spark and be a cause of explosion. If it cant be, then how is the procedure of externally powering the instrument.

Correctly installed hazardous area electrical equipment will not ignite a flammable atmosphere. That is the purpose of IEC60079.

Stop work. Consult a trained hazardous area installation designer locally. Delegate the responsibility for getting it right to this individual. Do not design, install, test or maintain electrical equipment in hazardous areas without having been trained beforehand. Training is available from various areas specifically for this purpose.

If the hazardous areas are large, then there is a process materials containment problem, which requires immediate addressing as the top priority. Consult a qualified Process Engineer locally.

Just yell instead. SUUUUEEEEYYYYY, SUUUUUEEEEEYYYYYY, Here pig, pig, pig . . .

No fuss, no muss, no sparks . . .

Suggest you consult a knowledgeable, local engineer. They would be familiar with the codes and regulations in force, wherever you are, if any.

Your prior posts do not instill confidence.

We'll look for the glow.

Intrinsic safety relies on there not being enough energy in the hazardous area to ignite the hazardous gas. A standard 24 volt power supply would have to be passed through a barrier mounted outside the hazardous area to limit the amount of energy available (commonly known as a zenner barrier). Consideration also has to be given to the inductance and capacitance of the cable as enough energy could be stored in the cable to ignite the gas.

As stated this is a subject for trained experts, if you asked this question you need help from a local expert who can properly assess the application.

Devices and simple systems are available to inexpensively convert units to IS. Most of it is eliminating the source of any sparks on the 24v range for your device.

Example: Many industrial electrical devices are used in X-P areas in the chemical industry. Using xp components within the motor and controls solves much of the sources. The source of the biggest sparks would be the connector between the battery (24v) and the fork lift propulsion/controls. Preventing sparks from occurring between the heavy load, the fork lift controls and motor, and the source of energy, the battery, is done by using a connector with 2 large contacts and 2 small contacts on each connector. The smaller contacts are located so that they control the passage of electricity to the fork lift. They make contact after the large power contacts have already made contact. When the small contacts have connected the large contacts are already connected. The small ones control the power from the battery by means of a XP relay located between the fork lift connector and the load. Thus the energy from the large contacts from the battery to the load are already in contact and can't spark when the small contacts make a completed circuit and close the relay.

The following are only 2 contact connectors but are identical in general appearance:

http://www.andersonindustrialandmining.com/Industrial/battery_connectors.html

Good Luck, Old Salt