Aritech DP721T Conventional Optical-Heat Multisensor Detector

1. Product Name: Aritech DP721T Conventional Optical-Heat Multisensor Detector

2. Description:

What Is the Aritech DP721T Multisensor Detector?

The Aritech DP721T is a conventional multisensor fire detector in the Dx700 series, combining optical smoke and heat detection in a single unit. It is zone-powered, has a remote indicator output and is CPR-certified.

Operating Principle

The DP721T detects smoke using optical light scattering at a sensitivity of 10%/m (+1.6%, -3.3%), while its heat sensor also monitors temperature changes. For heat detection, it evaluates a rate of temperature rise of 8°C/min above 40°C. The detector continuously monitors sensor sensitivity and operating status, automatically compensating each day for drift caused by background contamination to maintain factory calibration. Once a day, it performs a dynamic full diagnostic test of the sensing chamber and internal electronics. If sensitivity falls outside the limits or the test fails, the condition is reported to the panel and the yellow fault LED on the detector lights up.

Role in Fire Detection Systems

Using two different detection criteria together gives the detector broader coverage for different types of fire. It operates as a single device on a conventional zone and reports alarm conditions to the panel; the remote indicator output also enables alarm monitoring where the detector is not visible.

Why Choose It?

• Dual detection: The combined operation of optical and heat sensors broadens detection coverage.
• Intelligent self-diagnostics: Daily full diagnostic testing and drift compensation help reduce the risk of false alarms.
• Separate fire and fault LEDs: Alarm and fault conditions can be clearly distinguished on site.
• Wide operating voltage range: The 8.5 to 33 VDC range makes it suitable for most conventional systems.
• Easy maintenance: The optical chamber can be removed and replaced on site; the detector calibrates itself automatically when powered up.

Installation and Commissioning

The detector is ceiling-mounted on an Aritech DB702 conventional base. The base is supplied with a short-circuit link between the IN and OUT terminals; this link opens when the detector is fitted, so cable continuity can be tested only through the bases. The device is polarity-independent, reducing the risk of wiring errors. If required, the locking tab on the base provides additional protection against unauthorised removal. For maintenance, hold a magnet at the detector's test point to start the sensitivity test; no external test equipment or test gas is required.

Technical Specifications

• Status indication: White LED (red during an alarm), yellow LED (test and fault)
• User interface: LEDs
• Compatibility: Aritech conventional zones
• Reset voltage: <2.5 V (max.)
• Reset time: 1 s
• Number of alarm levels: 1
• Connection: Aritech conventional base
• Power supply type: Zone-powered
• Operating voltage: 8.5 to 33 VDC
• Current consumption: 100 µA (quiescent at 24 VDC) / <60 mA (alarm at 24 VDC)
• Detection principle: Optical light scattering and heat
• Sensitivity: 10%/m (+1.6%, -3.3%)
• Zone length: Cable-dependent
• Rate of rise (ROR): Above 40°C at 8°C/min
• Number of outputs: 1
• Output type and rating: Remote indicator
• Programmable: No
• Remote alarm output: 30 mA
• Dimensions: 100 x 50 mm (Ø x H)
• Net weight: 109 g
• Colour: Cream white (RAL 9001)
• Mounting type: Ceiling-mounted
• Housing material: Plastic
• Vandal-resistant: No
• Operating temperature: -10 to 55°C
• Storage temperature: -10 to 70°C
• Application temperature (typical): +25°C
• Relative humidity: %0 to %95 (non-condensing)
• Environment: Indoor
• IP rating: IP43
• Compliance: CE, REACH, RoHS 3, WEEE
• Certification: CPR
• Standard: EN54-7

Applications

• Offices and meeting rooms
• Hotel and dormitory corridors
• Schools and educational buildings
• Shops and commercial premises
• Hospitals and care homes
• General-purpose indoor applications

Compatible Products

The DP721T is mounted on the Aritech DB702 standard detector base. An AI672 or buzzer-equipped AI673 can be used for remote alarm indication. The detector can be used in systems with Aritech 1X-F4 and 1X-F8 conventional panels.

Frequently Asked Questions

Which detection methods does the DP721T use? It detects smoke using optical light scattering and temperature rise rate using its heat sensor.

How is the sensitivity test performed? Holding a magnet at the detector's test point starts the self-diagnostic routine; the LED indicates whether servicing is required.

Which base is it compatible with? It is compatible with the Aritech Dx700 series DB702 standard base.

At Narstek, we support your Aritech DP721T multisensor detector and conventional fire detection projects. Contact us for a quote.