Category:Hazardous area ATEX
Availability: 4 - 8 weeks
Tags: Trip, Amplifier, ATEX
The FP87 IS. Trip Amplifier contains intrinsically safe associated electrical apparatus, type IS320, to certificate BAS02ATEX7020. Trip amplifier options include flame rectification and infra red flicker and there are a range of associated detectors and probe assemblies available - contact Elcontrol sales for details.
These units are certified to the following European standards for electrical apparatus for use in potentially hazardous atmospheres: EN60079-0: 2012 + A11 2013 - EN60079-1: 2014
The intrinsically safe field terminals are suitable for connection to apparatus in areas rated Group II, gasses up to IIC, Zone 0.(Zones, gasses, and groups are as per IEC regulations)
These units permit intrinsically safe associated apparatus to be located within IIC hazardous area, thereby reducing the required lead length for the detectors, and resultant signal attenuation. The volt-free output relay contacts within the units permit unlimited lead length runs to the control cubicle or room.
This variant is designed to work with an insulated probe rod introduced into the periphery of the flame envelope, in association with an adjacent instrument earth. As the flame probe connection is intrinsically safe, any standard type of flame rod can be used, provided it is fitted with a cover, and the body has an external earth bonding connection (of at least 6 mm2 c.s.a.). The equipment should be installed in accordance with EN 60079-14 (1997). The Elcontrol IS/FE3 is an example of a suitable probe.
The principle of operation of the unit is that of 'flame rectification'. The flame rod and earth connections provide a crude diode effect to AC current flowing through the ionised gases within the flame. When this diode effect is sensed by the unit, the output relay is energised. A simple short circuit of the flame rod to earth will not simulate this diode effect and give a false flame signal. The unit provides a local signal strength output in the form of a 0-10V DC signal.
This variant is primarily designed to work with an Infrared flame scanner. The scanner should have an external earth bonding connection (of at least 6 mm2 c.s.a.), and the equipment should be installed in accordance with EN 60079-14 (1997). The Elcontrol IS/VH32 is an example of a suitable scanner.
The principal of operation of the unit is that of 'flame flicker'. There are fluctuations in the infrared radiation emitted by the flame being monitored, due to the combustion process. When IR signals in appropriate frequency bands are detected by the unit, the output relay is energised.
The electronics of the unit are designed to attenuate the mains frequency components, which may be picked up as 'hum' on the signal input lead to the unit, guarding against a false flame signal. The unit provides a buffered signal strength output in the form of a 0-10mA current loop.
As an alternative to the Infrared viewing head, the unit may also operate using a flame rod, as would be used with the ISFR unit. In this form, the unit responds to the variations in the conductivity of the flame due to the combustion process. This technique is not as effective as flame rectification, however it may be useful in certain applications, especially if 24V DC operation of the electronics is required.
|Flame Rectification Variant:||110V or 240VAC 50/60Hz|
|IR Flicker Variant:||110V or 240V AC 50/60Hz, 24V DC|
|Power Consumption:||Typically les sthan 8VA|
Compliance with EN60079-0: 2012 + A11 2013 - EN60079-1: 2014
FP87 Certification Information:
(FP87 I.S. Trip Amplifier)
II 2 G Ex db IIC T6 Gb Ta -20°C to +50°C certificate ref: Baseefa02ATEX0033