Scantronic SDR-WEXT-00 | Wired External Sounder & Strobe | Grade 2, Blue Strobe, 105dB

FAQs

What is the difference between the 85dB and 105dB sound output settings?

The SDR-WEXT-00 offers selectable sound output levels to accommodate different installation requirements and local noise regulations. The 85dB setting provides adequate alarm notification for residential properties, smaller commercial premises, or locations where noise restrictions apply, such as properties in close proximity to neighbours or areas subject to environmental health regulations limiting alarm volumes. The 105dB setting delivers significantly louder alarm output suitable for larger commercial or industrial premises, noisy environments where higher volume is needed for alarm audibility, or locations where maximum deterrent effect is desired. Installers select the appropriate output level during commissioning based on property size, ambient noise levels, local authority requirements, and customer preferences. The 20dB difference represents a substantial increase in perceived loudness, as decibel scales are logarithmic.

How does the built-in NiMH battery work and how long does it last?

The SDR-WEXT-00 incorporates a built-in 9V 180mAh NiMH (Nickel-Metal Hydride) rechargeable battery that provides backup power to maintain sounder operation during mains power failures. The battery is continuously trickle-charged from the control panel’s power supply when mains power is available, ensuring it remains fully charged and ready to support alarm operation if mains power is lost. During power outages or if intruders attempt to disable the system by cutting power, the battery enables the sounder to continue operating, maintaining alarm signalling capability. The duration of battery-powered operation depends on alarm activation frequency and duration, but typical standby capacity supports alarm signalling for adequate emergency response time. NiMH batteries offer good recharge characteristics and reliable performance across the sounder’s wide operating temperature range. Battery condition is monitored by the control panel, with alerts generated if charging issues occur.

Can the SDR-WEXT-00 be used with non-Scantronic control panels?

Yes, the SDR-WEXT-00 is specifically designed for compatibility with both Scantronic i-on10 control panels and third-party alarm control units. Unlike some Scantronic external sounders that utilize proprietary wireless protocols requiring Scantronic panels, the SDR-WEXT-00 uses standard wired connections that are compatible with industry-standard external sounder circuits. This makes the unit suitable for installations where installers prefer Scantronic sounder quality and features but are working with different manufacturer control panels. The wired interface follows conventional external sounder wiring practices, with connections for positive and negative power supply, trigger circuit, and tamper detection. Installers should verify that the control panel provides appropriate voltage (13.8-14.2V DC) and current capacity (270mA alarm current) to drive the sounder correctly, and that panel programming supports the sounder’s operational characteristics.

What does the built-in tamper protection detect?

The SDR-WEXT-00’s built-in tamper detection monitors for attempts to remove the sounder from its wall mounting or to open the cover to access internal components. The tamper circuit is connected to the control panel and generates an immediate tamper alarm if the sounder is removed from its mounting bracket or if the cover is opened while the system is armed. This tamper protection prevents intruders from disabling the external sounder before attempting entry, and alerts monitoring personnel to interference attempts. The tamper detection operates continuously regardless of system arm status in most configurations, ensuring the sounder’s security integrity is maintained at all times. The combination of plastic housing with inner metal cover provides both mechanical strength and tamper detection, protecting the internal electronics, battery, and speaker assembly from tampering or damage.

How does the built-in spirit level assist with installation?

The integrated spirit level simplifies the installation process by enabling installers to ensure the external sounder is mounted perfectly level without requiring separate tools. When mounting the sounder to external walls, achieving straight alignment is important both for professional appearance and to ensure weather sealing is optimal. The built-in spirit level provides immediate visual feedback during installation, allowing installers to adjust mounting position or bracket alignment until the unit is perfectly level before securing all mounting fixings. This feature is particularly valuable when installing on uneven walls, rendered surfaces, or where visual alignment with building features is important for aesthetic reasons. The spirit level eliminates the need to fetch separate levelling tools and speeds up the installation process, contributing to professional results with reduced installation time.

What maintenance does the SDR-WEXT-00 require?

The SDR-WEXT-00 is designed as a low-maintenance external sounder with the built-in NiMH battery continuously maintained by trickle charging from the control panel. Primary maintenance requirements include periodic testing of both the sounder audio output and strobe function during routine alarm system maintenance visits, typically performed annually or as required by insurance or monitoring company agreements. The control panel monitors battery charging status, alerting if battery condition deteriorates. Over time, rechargeable NiMH batteries gradually lose capacity and may require replacement after several years of service, though this is typically a straightforward procedure performed by qualified alarm engineers. External housing should be inspected for damage, proper sealing, or accumulation of debris that might affect the strobe lens or speaker vents. The tamper circuit should be tested periodically to verify security integrity is maintained. The robust construction and wide operating temperature range minimize weather-related maintenance issues.