55000-193APO Heat Detector CS, Two‑Wire AlarmSense, 84°C, EN54-5

Introduction to the 55000-193APO Heat Detector CS and its key features

The 55000-193APO AlarmSense Heat Detector (CS) is a purpose-built, two-wire fixed-temperature (high-temperature / CS) detector designed for environments where smoke-based detection is unsuitable or prone to nuisance alarms. With an approximate static response range of 84C to 100C and EN54-5 third-party certification, this detector is intended for demanding applications such as commercial kitchens, plant rooms, dusty workshops and warehouses. Its simple two-wire AlarmSense compatibility, 360 visibility alarm LEDs and white polycarbonate housing make it a straightforward choice for both new installs and retrofits where robust, reliable heat detection is required.

Detailed description of specifications and benefits

The 55000-193APO combines a clear set of technical specifications with practical benefits for installers, facilities managers and system designers. Below are the key technical details followed by what they mean in real-world use.

• Model: 55000-193APO
• Detector type: Fixed-temperature heat detector (CS / high temp)
• Sensing element: Matched-pair thermistor
• Static response temperature: Approx. 84C min  100C max
• Application temperature: Typical 55C, max 80C
• Supply voltage: 9  33 V DC (two-wire)
• Quiescent current: < 50 A @ 15 V
• Alarm current: Varies with voltage (example figures: 1.5 mA @ 28.5 V; ~25 B1 2 mA @ 10.5 15 V; 1.5 mA @ 18 24 V; 2 mA @ 33 V)
• Reset voltage / time: Reset voltage  2 V; reset time approx. 1 s
• Weight: ~80100 g
• Dimensions:  100 mm  42 mm (detector); ~50 mm depth with base
• Material / finish: White polycarbonate
• IP rating: IP44 commonly listed (verify on datasheet)
• Compatible base: AlarmSense base 45681-244APO
• Approvals: EN54-5 (third-party certified)

• Reliable performance in challenging environments Because it responds to temperature rather than smoke particulates, the detector avoids the nuisance alarms that can be triggered by dust, steam or cooking fumes. This makes it ideal for kitchens, boiler rooms, maintenance areas and industrial spaces.
• Simplified installation Two-wire AlarmSense compatibility and polarity insensitivity reduce wiring complexity and installation time, while compatibility with standard AlarmSense bases ensures easy replacement or retrofit.
• Clear alarm indication Twin LEDs provide 360 visibility for quick visual identification of alarmed units, helping first responders and maintenance staff locate the source rapidly.
• Standards compliance EN54-5 third-party certification provides confidence that the detector meets recognized European performance and reliability criteria (always verify certificate details for your project).
• Low quiescent current Minimal standby power draw helps when designing circuits for battery-backed systems or where many detectors are powered on the same loop.

Use cases and scenarios where the 55000-193APO excels

Fixed-temperature (CS) heat detectors like the 55000-193APO are purpose-designed for locations where smoke detectors are ineffective or will generate false alarms. Typical use cases include:

• Commercial kitchens: Cooking produces steam, grease-laden particulates and transient smoke that can trigger optical smoke detectors. A fixed-temperature heat detector avoids these nuisance alarms while still providing dependable high-temperature detection in a fire event.
• Industrial workshops and manufacturing: Areas with dust, fibers, or regular particulate generation (sanding, machining, textiles) benefit from heat detection where smoke sensors would be overwhelmed.
• Plant rooms and boiler houses: Enclosures with high ambient temperatures, cycling machinery and ducting demand detectors that tolerate higher operating temperatures without false triggering. The 84C response threshold and 55C typical application temperature make this detector well suited to such environments.
• Warehouses and storage facilities: Large open spaces with variable conditions, or storage of materials that create dust or particulates, can rely on fixed-temperature detectors to reduce false alarms while protecting assets.
• Retrofit and contractor projects: Where existing wiring infrastructure is AlarmSense-compatible, this two-wire device is easy to integrate into existing loops, simplifying upgrades and replacements.

Comparisons with similar products on the market

When selecting detectors for a fire detection scheme its important to choose the right sensing technology for the environment. Heres how the 55000-193APO compares with common alternatives:

• Fixed-temperature detectors trigger at a preset threshold (in this case ~84C100C). They are reliable for slow-developing fires that reach a high steady temperature.
• Rate-of-rise detectors respond to rapid temperature increases even if the absolute temperature is lower. They can detect fast-developing fires earlier but may be more susceptible to false alarms from machinery heat spikes.
• The 55000-193APO is a fixed-temperature (CS) device and is therefore best where ambient temperatures are relatively stable or where quick temperature spikes are less common than sustained high heat.

• Smoke detectors (optical or ionisation) typically provide earlier detection for smouldering or smoky fires in clean indoor environments but are prone to nuisance alarms in kitchens, dusty or humid areas.
• Heat detectors like the 55000-193APO are the preferred choice where smoke detectors cannot be used reliably. They sacrifice some early detection for greater robustness against false alarms.

• Multi-sensor detectors combine heat and smoke sensing for greater overall sensitivity and lower false alarm rates in many commercial settings. However, they are more complex and may still suffer in very dirty environments.
• The 55000-193APO is a single-mode heat detector, offering the simplicity and durability needed for harsh conditions. For mixed environments, a combination of detector types or multi-sensor devices might be considered.

Customer testimonials and installer feedback

Specific customer reviews for this model may vary by vendor and project, and none are quoted directly here. However, installer and facilities feedback on fixed-temperature, AlarmSense-compatible heat detectors typically highlights these themes:

• Fewer nuisance alarmsin kitchens and dusty production areas compared with optical smoke detectors, reducing unwanted disruption and service calls.
• Easy retrofit installationwhen replacing old detectors on compatible bases or when adding detectors to existing two-wire loops.
• Robust operationin higher ambient temperatures and challenging conditions, with visible LEDs aiding rapid identification of triggered units.

For project-specific references, ask your supplier for case studies or site references demonstrating the detectors performance in environments similar to yours.

Conclusion: Why the 55000-193APO is a strong choice

The 55000-193APO Heat Detector CS delivers a focused, dependable solution where smoke detection is impractical. Its fixed-temperature sensing, matched-pair thermistor element and EN54-5 certification provide assurance for applications that demand high-temperature detection without the false alarms associated with smoke sensors. The two-wire AlarmSense compatibility and low quiescent current make it easy to specify and install on typical alarm loops, while the 360 alarm LEDs aid fast visual identification of alarmed devices.

Recommended where environments are dusty, smoky or humid, or where kitchens and plant rooms create conditions unsuitable for smoke detectors. Its modest suggested price point (suggested price  16.56) and straightforward compatibility with standard AlarmSense bases make the 55000-193APO a practical, cost-effective choice for contractors and facilities teams seeking a rugged heat detection solution. Always confirm the detectors IP rating, alarm-current characteristics and certificate details from the official datasheet before final specification, and ensure installation and commissioning are carried out by a competent fire alarm installer in accordance with BS 5839 (or local standards).