Technical Specifications:
The document outlines the specifications for the ETH20MD series electronic sounders, which are designed for environments requiring alarm systems in potentially explosive atmospheres. The sounders are available in various voltage options: 24VAC/DC, 115VAC, 115VDC, 230VAC, 48VAC, and 48VDC, with a rated current of 0.220A at 24VAC/DC. They operate within a temperature range of T6: -20°C (-40°C) to +40°C and T5: -20°C (-40°C) to +60°C. The sounders are coated in epoxy red RAL3000, with other colors available upon request. Sound power levels are 101/104 dB at 1 meter and 91/94 dB at 3 meters.

Features:
The ETH series sirens are multi-functional, offering five selectable sounds for different warning scenarios, including danger and fire evacuation. They are ATEX certified under the EN60079 standard.

Materials:
Constructed from low copper content aluminum alloy, the sounders include an electronic modular circuit and resonance unit, with sound amplified by an external exponential aluminum trumpet.

Sound Options:
Available sounds include five-tone, two-tone (550Hz/0.1sec + 440Hz/0.4sec), monotonous (550Hz), yelp (fast ramp from 600 to 1550Hz), wail (slow ramp from 600 to 1550Hz), and periodic intermittence (550Hz 1s ON / 1s OFF). Sound levels range from 72 dB at 32 meters to 90 dB at 4 meters.

Protection and Mounting:
The sounders are IP66 rated for protection and come with a stainless steel 316 mounting bracket. They are designed for continuous service and are explosion-proof, suitable for zones 1, 2, and 22, compliant with Directive 2014/34/UE.

Accessories and Coating:
Optional accessories and epoxy coatings in yellow, blue, grey, and black are available upon request.