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INSTALLATION &
TECHNICAL INFORMATION
PLEASE READ PRIOR TO INSTALLATION
Clifford and Snell Intrinsically Safe Combination Signal
YL50 Sounder Beacon Range
VISUAL AND/OR AUDIBLE SIGNALLING DEVICES
APPROVALS AND CONFORMITIES
1
252163, Issue 2, 23/06/2023
Website: www.moflash.com
Email: technical@moflash.co.uk
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Summary of Contents for Clifford & Snell YL50
- Page 1 INSTALLATION & TECHNICAL INFORMATION PLEASE READ PRIOR TO INSTALLATION Clifford and Snell Intrinsically Safe Combination Signal YL50 Sounder Beacon Range VISUAL AND/OR AUDIBLE SIGNALLING DEVICES APPROVALS AND CONFORMITIES 252163, Issue 2, 23/06/2023 Website: www.moflash.com Email: technical@moflash.co.uk...
- Page 2 1.0 Introduction The Clifford & Snell Intrinsically Safe combination Sounder-Beacon range of products YL5IS (Yodalight) are ATEX certified. This range is ap- proved to be installed in Group II (above ground) applications in Zones 0, 1, & 2 with gas groups IIA, IIB, IIC, and Zones 20, 21 & 22 for dust groups IIIC and carries a temperature classification of T4.
- Page 3 4.0 Zones, Groups and Temperature Classifications The Clifford & Snell YL5IS is certified to the following: YL5/IS*/*/T4 II 1 G Ex ia IIC T4 Ga, II 1 D Ex ia IIIC T 110°C Da. This means that the units can be installed in locations with the following conditions when connected to an approved system: Zones Zone 0...
- Page 4 5.0 Installation Figure 1 Key Components 1. Lens 5. Sounder PCB 2. Beacon PCB 6. Sounder Front Cover 3. Back Box 7. Retaining Screws 4. Terminal Block General Requirement The Sounder must be installed in accordance with the latest EN60079-0 or equivalent IEC specification.
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Page 5: Dimensional Drawing
DIMENSIONAL DRAWING Front View Side View Figure 2 6.0 Wiring Single Stage Alarm • Connect the leads according to the circuit diagram (Figure 3) • Supply the active device with power. The unit contains 2 printed circuit boards (one for the sounder & one for the beacon). - Page 6 Loop in/Loop out wiring A single-channel safety barrier or single intrinsically safe connection is required. Wires C & D are not included on delivery. A: +ve Supply B: 0v Supply C: +ve Link Wire D: 0v Link Wire Figure 4 Two Stage Alarm The C&S YL5IS has options for first and second sounder stages.
- Page 7 Line Monitoring If Line Monitoring is required, this can be achieved by using an end-of- line resistor. For this purpose, a wire-wound or metal film resistor with a resistance value of at least 750 Ohm and rated power of at least 2 W or a 4700 Ohm and a rated power of at least 0.4 W.
- Page 8 Barrier/Isolator Information Connection into the unit must be via a suitably rated Zener Barrier or Galvanic Isolator. If these units are powered directly without a Barrier/Isolator, the PCBs will be permanently damaged and warranty will be void. Example of single channel barrier connection Single barrier connections can be used for simple power supply installations,...
- Page 9 Galvanic Isolators The Galvanic Isolators have the advantage of not requiring an isolated high integrity earth to be installed, which is required for Zener Barriers. These Isolators are often more expensive per unit but may reduce installation costs as the earth is not required. Single isolator connections can be used for simple power supply installations,...
- Page 10 7.0 Maintenance Little or no maintenance is required during the normal working life of the product. The C&S YL5 Intrinsically Safe enclosures are resistant to most acids, alkalis and chemicals and have been designed to withstand severe weather conditions. However it is suggested that continuous supervision and periodic inspections may be required in relation to the requirements of the installation as per IEC 60079-17.
- Page 11 9.0 Technical Data • Operating voltage: 16.2 - 26.4vDC • Current Consumption: Power Certified Barrier / Current Sound Output Supply Isolator Consumption (dB(A) @ 1m) Parameters (Tone 1) 24vDC 28v/300Ω 24mA 18vDC 28v/300Ω 33mA • Entity Parameters: Beacon Sounder Combined 93mA 93mA 93mA...
- Page 12 9.0 Tone Table Second Tone Selection dB(A) @ Current First Stage Frequency Repetition Tone Description Stage DIP Switch Draw Tone (Hz) Rate Tone (±3dB) (mA) 1 2 3 4 5 Alternating 800-1000 Alternating 2500-3100 0.5 Alternating (fast) 800-1000 0.25 Alternating (fast) 2500-3100 0.25 Alternating 440-554...
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