6.ELECTRICAL SYSTEM DESIGN FOR INSTALLATION IN HAZARDOUS AREAS USING ZENER BARRIERS

the galvanic isolator on and off, or by a mechanically activated switch on the hazardous area side of the isolator.

If the beacon is controlled by a switch in the positive supply, or the power supply is being turned on and off, only a single channel Zener barrier is required as shown in Fig 3. This circuit may also be used if the beacon is being controlled by a mechanically activated switch on the hazardous area side of the barrier. The power supply voltage should be between 20V and the maximum working voltage of the barrier. The circuit will continue to work at lower voltages, but the beacon light output level will be reduced.

If the beacon is being operated from a lower voltage power supply of say 12V or less, then a 15V 100 ohm barrier can be used which will improve the beacon light output levels at lower voltages.

Hazardous Area

Safe Area

Klaxon IS-XN

Galvanic

Beacon

Isolator

+

+

-

-

 

On / Off

+

Power

 

 

Supply

 

0V

Hazardous Area

Safe Area

 

Syrex IS-XN

28V

1.2W

Beacon

 

Positive

+

Barrier

+

 

 

 

-

 

On/Off

 

Power

 

 

 

 

Supply

 

 

0V

Fig 3 Using a single channel barrier.

If the beacon control switch is in the negative wire and the power supply 0V is earthed, the circuit shown in Fig 4 may be used. For simplicity the two barriers may be combined into one package. The power supply voltage should be between 21V and the maximum working voltage of the 28V barrier. The circuit will continue to work at lower voltages, but the beacon brilliance will be reduced.

Fig 5 Basic circuit for use with a galvanic isolator.

The control arrangement will vary depending upon the isolator chosen. The galvanic isolator must be able to supply an output of 30mA at about 16V.

10. CABLE PARAMETERS

The maximum permitted cable parameters are as specified on the certificate of the Zener barrier or galvanic isolator that has been selected for the installation. Normally the limits are not restrictive, but care should be taken not to exceed a capacitive limit of 83nF for IIC installations when very long cables are used.

11. BEACON FLASH RATE

The Syrex IS-XN can be set to two flash rates 1 double flash per second 1Hz (slow rate) or two double flashes per second 2Hz fast rate).

The flash rate is selected by the position of the pin header next to the input terminal block (see fig 1).

Hazardous Area

Syrex IS-XN

Beacon

+

-

Safe Area

 

28V 1.2W

 

Positive

Barrier

+

 

Power

 

Supply

Diode Return

 

Barrier

On/Off

 

 

0V

12. MAINTENANCE

The beacon should be regularly inspected to ensure that it has not been damaged. Frequency of inspection depends upon environmental conditions, but initially we recommend that this should be done annually.

No attempt should be made to repair a faulty Syrex IS-XN beacon. Suspect beacons must be returned to Klaxon Signals Ltd. or to your local agent for repair.

13. GUARANTEE

Beacons which fail within the guarantee period should be returned to Klaxon Signals Ltd. or our local agent. It is helpful if a brief description of the fault symptoms is provided.

Fig 4 Single stage alarm using two channel barrier.

7. ELECTRICAL SYSTEM DESIGN FOR INSTALLATION IN HAZARDOUS AREAS USING GALVANIC ISOLATORS.

Galvanic isolators do not require a high integrity earth connection. For small systems where a high integrity earth is not already available, the use of galvanic isolators often reduces the overall installation cost and simplifies design.

The Syrex IS-XN beacon may be powered by any galvanic isolator having output parameters within the limits specified in section 4.3, which has been certified EEx ia by an EC Notified Body. The beacon may be controlled by turning

_______________________________________________________________________________________________________________________________

Klaxon Signals Ltd. Wrigley Street, Oldham, Lancashire UK OL4 1HW

sales@klaxonsignals.com

Tel: +44 (0)161 287 5555

Document No. Klaxon Syrex IS-XN

Issue: A 11-11-05

Sheet 3 of 3

www.klaxonsignals.com

Fax: +44 (0)161 287 5511

 

 

Page 3
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Klaxon Syrex IS-XN instruction sheet Cable Parameters, Beacon Flash Rate, Maintenance, Guarantee

Syrex IS-XN specifications

The Klaxon Syrex IS-XN is a state-of-the-art industrial signaling device designed to meet the demands of challenging environments. Engineered for reliability and efficiency, the Syrex IS-XN combines cutting-edge technology with a robust design, making it ideal for industrial applications, including manufacturing, oil and gas, and chemical processing.

One of the standout features of the Syrex IS-XN is its powerful audio output. Producing up to 120 dB(A) of sound, it effectively captures attention in loud industrial settings. This high decibel level ensures that alarms can be heard over machinery noise and other ambient sounds, providing an essential layer of safety in the workplace. The device offers a variety of sound options, allowing users to select distinct alarm signals tailored to specific scenarios, ensuring that alerts are immediately recognized by personnel.

In addition to its audio capabilities, the Syrex IS-XN is equipped with innovative visual signaling options, including a vibrant LED strobe light. This combination of auditory and visual alerts enhances overall safety and situational awareness. The strobe light is highly visible even in daylight conditions, making it an effective tool for signaling emergencies, equipment malfunctions, or other critical situations.

The Syrex IS-XN is designed for versatility, featuring multiple mounting options, including wall, pole, or ceiling installation. This adaptability allows it to be integrated seamlessly into various environments, regardless of space constraints. Its durable housing is constructed from high-quality materials that are resistant to harsh weather conditions, dust, and moisture, making it ideally suited for outdoor and industrial use.

Another significant advantage of the Syrex IS-XN is its ease of installation and maintenance. The device is designed with user-friendly features that facilitate quick setup and minimal downtime. Additionally, it is compatible with a range of power supplies, including AC and DC options, further enhancing its flexibility across different systems.

The Syrex IS-XN also prioritizes energy efficiency. Its innovative design minimizes power consumption without compromising performance, making it an environmentally friendly choice for businesses looking to reduce their carbon footprint.

Overall, the Klaxon Syrex IS-XN is a versatile, reliable, and effective industrial signaling solution. With its powerful audio alerts, vibrant visual signals, durable construction, and user-friendly features, it sets a new standard for alarm systems in demanding environments, ensuring safety and efficiency in critical operations.