• Product Overview

The MD368 Series is a commercial and residential-grade UART Smoke and Heat Alarm designed for smart home, IoT, and wireless security applications. Equipped with an integrated 4-PIN UART interface, it allows seamless integration with RF modules and operating system control panels. The series offers versatile configurations, functioning as a standalone photoelectric smoke detector, a dedicated thermal heat alarm, or a dual smoke/heat combo alarm, with a 10-year long-life lithium battery option.

 

• Core Applications

IoT & Smart Home Systems: Plug-in RF module integration via UART.

Home Security Industry: Wireless-linked fire and smoke operating systems.

Universal Fire Protection: Suitable for residential, commercial, and industrial deployments.

Regulatory Approvals & Certifications.

Smoke Detection: EN 14604.

Heat Detection: EN 54-5.

 

• Model Nomenclature & Selection Guide

[ MD368 ] + [ Sensor Type: S / H / SH ] + [ Lifespan: Blank / T ] + [ Battery Config: B1 / B3 ].

Sensor Types.

MD368S / MD368ST: Photoelectric Smoke Alarm Only.

MD368H / MD368HT: Thermal Heat Alarm Only.

MD368SH / MD368SHT: Dual Combo Smoke and Heat Alarm.

Note: "T" indicates the 10-Year Long-Life Battery type.

Battery and Lifespan Configuration Matrix.

 

• Model Name

Sensor Type Primary Battery (Detector Power) Secondary Battery (RF Module Power) Expected Battery Life.

MD368SB1 Smoke Only Panasonic CR123A 3.0V (Replaceable) Shares Primary Battery 1.2 Years (Total System).

MD368STB3 Smoke Only Energizer L91 1.5V AA * 2 (Fixed, 10-Year) Panasonic CR123A 3.0V (Replaceable) Detector: 10 Years.

MD368HB1 Heat Only Panasonic CR123A 3.0V (Replaceable) Shares Primary Battery 2 Years.

MD368HTB3 Heat Only Energizer L91 1.5V AA * 2 (Fixed, 10-Year) Panasonic CR123A 3.0V (Replaceable) Detector: 10 Years.

MD368SHB1 Combo (Smoke+Heat) Panasonic CR123A 3.0V (Replaceable) Shares Primary Battery 2 Years.

MD368SHTB3 Combo (Smoke+Heat) Energizer L91 1.5V AA * 2 (Fixed, 10-Year) Panasonic CR123A 3.0V (Replaceable) Detector: 10 Years.

 

• Key Features and Technical Benefits

High-Precision Photoelectric Chamber: Advanced optical sensor for reliable smoldering fire detection.

Optional Fixed Temperature (FT) Thermal Sensor: Reliable heat detection for kitchen or dusty environments.

Integrated 4-PIN UART Interface: Allows external RF boards to control Test Key, LED indicators, and Buzzer.

Advanced Diagnostics: Automated self-diagnostic sensor test with real-time analog sensitivity and battery capacity output.

Environmental Adaptability: Built-in intelligent temperature compensation to prevent false alarms.

Ultra-Low Power Consumption: 25uA standby current optimizes long-term battery performance.

Safety Alerts: Distinctive low battery warning signal and 85dB alarm siren.

 

• Technical Specifications

General Electrical & Physical Parameters.

Sound Level: 85dB at 3 Meters (3M).

Rating Voltage: DC 3V.

Low Voltage Warning Threshold: DC 2.6V ~ 2.7V.

Standby Current: 25uA.

Maximum Alarm Current: 60mA (Max).

Operating Temperature: 0°C to 50°C (32°F to 122°F).

Operating Humidity: 5% to 90% RH (Non-condensing).

Physical Dimensions: 120 mm (Diameter) x 52.45 mm (Height).

Sensor Sensitivity and Compliance Matrix.

Model Series.

Smoke Sensitivity Range Heat Temperature Range Compliance Standards.

MD368S Series (Smoke) • EN 14604: 0.08 dB/m ~ 0.12 dB/m.

MD368H Series (Heat) Not Applicable (N/A) • EN 54-5: Class A2S (Fixed Temp).

MD368SH Series (Combo) • EN 14604: 0.08 dB/m ~ 0.12 dB/m.

 

• Annex: Response Time & Temperature Classifications

Table 1: EN 54-5 Response Time Limits for Class A2 Detectors.

When subjected to a fixed rate of air temperature rise, the MD368 heat sensor responds within the following strictly regulated limits:

Rate of Rise of Air Temperature (°C/min).

Lower Response Limit (Min / Sec) Upper Response Limit (Min / Sec).

1 °C/min 29 min 00 sec 46 min 00 sec.

 

• FAQ

Q1: Which MD368 model should I choose for a 10-year smart home application?

A1: You should select the MD368STB3 (Smoke only), MD368HTB3 (Heat only), or MD368SHTB3 (Combo). These models utilize fixed, non-replaceable Energizer L91 Lithium 1.5V AA batteries that power the detector for 10 years, while featuring a replaceable Panasonic CR123A battery dedicated to the UART RF module.

Q2: How does the MD368 smoke alarm interface with wireless IoT systems?

A2: The MD368 series features a built-in 4-PIN connector providing a UART interface. This allows external RF modules, Sub-G, Zigbee, Z-Wave, or Wi-Fi boards to query analog sensitivity levels, monitor battery capacity, and trigger or override hardware functions like the Test Key, LED indicators, and Buzzer.

Q3: Can the MD368 heat detector be used in kitchens?

A3: Yes. The MD368H are meet with EN 54-5 (Class A2S).

+. This makes them ideal for kitchens, garages, or dusty environments where standard optical smoke detectors might trigger false alarms due to cooking particles or dust.