The Vershoven industrial telephone model A24, order number 01.01001, is a weatherproof device specifically designed for use in dusty and humid environments. It is suitable both as a station telephone in telephone systems and as an end device in industrial or outdoor applications. The telephone features a robust control panel with 16 keys designed for high mechanical stress. Optional key backlighting is available, facilitating operation in poorly lit areas. An integrated hearing amplifier can be activated as needed to improve audibility for users with hearing impairments. The handset cord is designed as a spiral spring, ensuring a flexible and durable connection. An infinitely adjustable holder ensures the handset remains securely positioned even under vibrations.

Applications
The A24 is designed for industrial environments where high mechanical stress, dust, humidity, or temperature fluctuations occur. It is suitable, for example, in production halls, warehouses, outdoor areas, or manufacturing facilities where reliable communication under challenging conditions is required. The weatherproof design allows outdoor use, provided environmental conditions remain within specified limits.

Functions and Equipment in Detail
The telephone supports both multi-frequency dialing (MFV) and pulse dialing (IWV), ensuring compatibility with various telephone systems and networks. Functions include redial, mute, speakerphone, speed dial, and the ability to store up to four destination numbers. Additionally, up to two special function keys can be added, which can be assigned various functions such as handset/headset, ground/flash, or hearing amplifier, depending on requirements. The keys are robust and designed for frequent use.

Technology Explained Simply
The A24 housing is made of polyamide, a high-strength plastic that resists mechanical stress and chemical influences. The IP 66 protection rating means the device is dust-tight and protected against water jets from any direction, making it suitable for outdoor use or in humid indoor environments. The operating temperature range is between -25°C and +55°C, with a storage temperature range of -40°C to +70°C. Relative humidity must not exceed 95%. The ring tone volume is between 60 and 90 dB(A) at a distance of one meter, ensuring good audibility even in noisy environments. The terminal blocks are suitable for cable cross-sections from 0.08 to 2.5 mm², including single, multi, and fine-stranded cables. Cable glands are M16 with a diameter of 5 to 10 mm. Blind plugs are available in sizes M12 and M16. The handset connects via an M12Flex mounting with a diameter of 3 to 6.5 mm. The locking screws are made of V4A steel (1.4571), ensuring high corrosion resistance.

Compatibility and Accessories
The A24 is designed for use in telephone systems with multi-frequency and pulse dialing. It can be used as a station telephone or end device. The optional special function keys can be assigned various functions depending on requirements, such as handset/headset, ground/flash, or hearing amplifier. Key backlighting is available as an option. CE conformity according to EN 50081, EN 50082, EN 60950, and network access according to CTR21 ensure compliance with required standards.

Installation and Mounting
Installation is carried out using the integrated cable glands and blind plugs. The M16 cable gland allows secure fastening of cables with a diameter of 5 to 10 mm. Blind plugs in sizes M12 and M16 are used to seal unused connection openings. The infinitely adjustable handset holder facilitates installation and secures the handset during vibrations. The terminal blocks are compatible with various cable types, enabling flexible installation.

Operational Advantages
The A24 offers high reliability in demanding environments. The weatherproof design, robust construction, and integrated features such as the hearing amplifier and special function keys enhance user-friendliness and functionality. The infinitely adjustable handset holder and spiral handset cord ensure secure and flexible operation. Compliance with CE standards and network access according to CTR21 guarantee compatibility and safety during operation.