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Unit C-105 Mason Creek Business Park,  21815 Katy Freeway

Katy, Texas - TX 77450

Tel: 281 646 8777     Fax: 281 646 8788     Toll Free: 1 - 866 - 447 - 8777

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Intrinsic Safety is the method of protection for control and instrumentation circuits where the nominal voltage is 24 VDC or less and the current is normally less than 100 mA. The concept of intrinsic safety is to limit the voltage and current so that there is never a spark with enough energy to create an explosion.

Intrinsic safety when properly used removes the ignition from the explosion triangle. There are three components to an intrinsically safe circuit:  the field device, intrinsically safe barrier and field wiring.

• Field devices known as intrinsically safe apparatus are classified as simple or complex.

• Simple apparatus, which do not need to be approved, are non energy storing devices such as contacts,

 thermocouples, RTDs, LEDs and resistors.

• Complex apparatus such as transmitters, solenoids, relays and transducers may store excess energy and need to

 be approved by a third party.

• Contacts, transmitters and temperature sensors are the most commonly used field devices in intrinsically safe applications.

• The intrinsically safe barrier limits the current with a resistor and the voltage with a zener diode.

• Intrinsically safe circuits are designed so that they operate properly under normal conditions, but keep the energy levels below the ignition curves when a fault condition occurs.

There are three components to a barrier that limit current and voltage: a resistor, at least two zener diodes, and a fuse. The resistor limits the current to a specific value known as the short circuit current, ISC. The zener diode limits the voltage to a value referred to as open circuit voltage, Voc. The fuse will blow when the diode conducts. This interrupts the circuit, which prevents the diode from burning and allowing excess voltage to reach the hazardous area. There always are at least two zener diodes in parallel in each intrinsically safe barrier.

If one diode should fail, the other will operate providing complete protection.

RSSUS also supply IS Pressure Transmitters and Proximity Switches and other IS instrumentation allowing IS control to be used in hazardous locations, reducing the need for bulky cabling, glands and enclosures.  

Please contact us to discuss your particular needs a member of our technical team

will be happy to assist.  Toll Free: 1 866 447 8777

INTRINSICALLY SAFE SYSTEMS

RSSUS design, manufacturer, install and commission Intrinsically Safe - IS certified instrumentation & control systems for varied Onshore and Offshore applications. Below are some of the basic components that contribute to an IS circuit:

• Sensors Pressure, Temperature, level, Pulse, Encoder
• Displays HMI Screens, single layer text, multi layer text, Black/White, Colour
• Enclosures Stainless Steel, Cast Alloy, Poly Carbonate
• Barriers PSU, Converters, Repeaters, Programmable, Signal Splitters