ADEMCO Multiplex Motion Sensor 4278EX-SN

( Brand: Ademco ), ( Manufacturer Part Number: 4278EXSN ), ( Model: 4278EX-SN ), ( Type: Motion ), ( Connectivity: Infrared )

Review ADEMCO Multiplex Motion Sensor

The ADemco 4278EX-SN Multiplex Motion Sensor is a versatile and advanced security device designed to detect intruders and enhance the overall security of your property. This motion sensor is part of the ADemco 4278EX Series, which is known for its reliability and ease of installation.

The 4278EX-SN sensor utilizes multiplex technology, which allows it to communicate with up to 31 devices on a single two-wire loop. This feature reduces the need for additional wiring and simplifies installation, making it an ideal solution for larger installations or those with limited wiring capacity.

The sensor's detection range is adjustable from 10 to 30 feet, allowing you to customize the coverage area to fit your specific security needs. It also features adjustable sensitivity levels, which help minimize false alarms caused by pets or other small movements.

The 4278EX-SN sensor is designed with a sleek and compact form factor, making it easy to conceal and blend in with your decor. It is also equipped with a tamper switch, which alerts you if the sensor is opened or removed, providing an added layer of protection against potential intruders.

The sensor is also designed to be compatible with various security panels, including those from ADemco, Honeywell, and DSC. This compatibility allows for seamless integration into existing security systems, making it a flexible and versatile option for both new and existing installations.

The ADemco 4278EX-SN Multiplex Motion Sensor is also built to last, with a durable and weather-resistant housing that can withstand harsh environmental conditions. It is also backed by a robust warranty, ensuring peace of mind and protection against any manufacturing defects.

In summary, the ADemco 4278EX-SN Multiplex Motion Sensor is a reliable, versatile, and easy-to-install security device that offers adjustable detection range, sensitivity levels, and communication capabilities. Its sleek design, compatibility with various security panels, and durability make it an excellent choice for both residential and commercial security applications.

Pros and Cons of buying a ADemco 4278EX-SN Multiplex Motion Sensor

The ADemco 4278EX-SN is a multiplex motion sensor designed for use with security systems. This device can detect motion and send an alert to the control panel. In this analysis, we will examine the pros and cons of investing in this motion sensor.

A. Multiplex Functionality

The 4278EX-SN is a multiplex device, meaning it can share a single wire with other sensors in the system. This reduces the need for additional wiring, making installation easier and more cost-effective.

B. Compatibility

This sensor is compatible with various security panels and systems, including those from ADemco, Honeywell, and DSC. This versatility allows for greater flexibility in choosing a security solution.

C. Pet Immunity

The 4278EX-SN includes pet immunity, which can be adjusted from 15 to 50 pounds. This feature ensures that small pets do not trigger false alarms, reducing the likelihood of unnecessary notifications.

A. Limited Coverage Area

The sensor has a relatively small coverage area of approximately 40 feet in diameter. This might not be sufficient for larger spaces, requiring the installation of multiple sensors.

B. Sensitivity Adjustment

The sensitivity of the sensor cannot be adjusted locally. Instead, adjustments must be made through the control panel, which may require additional steps and potential inconvenience.

The ADemco 4278EX-SN Multiplex Motion Sensor offers several advantages, such as multiplex functionality, compatibility, and pet immunity. However, it also comes with some drawbacks, including a limited coverage area and the need to adjust sensitivity through the control panel.

If you're looking for a multiplex motion sensor that is easy to install, offers pet immunity, and is compatible with various security systems, the ADemco 4278EX-SN might be a good choice for you. However, consider the coverage area and sensitivity adjustment limitations before making a final decision. If you require a sensor with a larger coverage area or the ability to adjust sensitivity locally, you may want to explore other options.

Details:

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part #: 4278exsn prices

• $6.30-$99.99

specifications secimotions:

• brand: Ademco
• mpn: 4278exsn
• model: 4278ex-sn
• type: Motion
• connectivity: Infrared

shipping secimotions:

• transit: 4-13 Days
• type: Calculated
• cost: $0.00
• class: Standard
• carrier: USPS
• service: USPS Ground Advantage

general secimotions:

• condition: Open box
• Surveillance Smart Home Electronics > Home Surveillance > Sensors Motion Detectors

payments secimotions:

• credit card: Mastercard
• other
• wallet: Apple-pay

returns secimotions:

• policy: No Returns

offer secimotions:

• started: January 13, 2026
• quantity: 1
• options: Ship-to-home
• sold: 0
• best offers: True
• availability: In Stock

seller secimotions:

• city: Watertown, New York
• # reviews: 158
• rating: 100.0%

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