Introduction to the Apollo Series 65 CS Fixed Heat Detector (55000-137APO)
The Apollo Series 65 CS Fixed Heat Detector (part number 55000-137APO) is a conventional fixed heat detector designed for high-temperature environments where smoke detection is impractical. Built around a dual thermistor sensing network, this CS-class device activates at a preset 90C threshold, providing reliable, robust detection in dusty, smoky or otherwise challenging locations. With broad approvals (EN54-5 and Series 65 family listings such as LPCB, VdS and CPR), an IP23D rating and a wide supply range, the Series 65 CS is a practical choice for installers, contractors and facility managers seeking dependable heat detection backed by industry standards.
Key Features at a Glance
- Fixed heat detection — CS class (90C)for high temperature environments.
- Dual thermistor networksensor for accurate ambient temperature monitoring and stable performance.
- Wide supply range:92 V DC with polarity-insensitive terminals to simplify wiring.
- Optional test facilities:flashing LED and magnet-operated test on applicable variants to aid commissioning and maintenance.
- IP23D protectionand durable construction for typical indoor industrial environments.
- Approvals:EN54-5 and Series 65 family approvals (LPCB, VdS, CPR).
- Long warranty:10 years for peace of mind.
Detailed Specifications and Benefits
The Series 65 CS operates from 9 to 33 V DC, making it compatible with most conventional fire alarm panels and power supplies. The detector draws a low quiescent current (250 A), which helps conserve power on conventional loops or zones. Alarm signalling is provided through a 420 9 series output with a 2 V drop; the LED indicator requires a minimum of 12 V to illuminate. Terminals are polarity insensitive (L1 & L2), reducing installation errors and simplifying field wiring.
The core sensing element is a dual thermistor network. Compared with simple fixed-bimetal or single-sensor designs, a thermistor arrangement offers more stable measurement of ambient temperature and better immunity to transient spikes or electrical noise. This stability reduces nuisance alarms while maintaining reliable detection at the preset CS (90C) threshold.
The detector is rated to operate between 1C and +90C and tolerates relative humidity up to 95% (non-condensing and no icing), making it suitable for a wide range of industrial and commercial indoor sites. The IP23D rating protects against solid objects greater than 12 mm and falling water sprays, suitable for many plant rooms, kitchens and garage areas, though detectors should not be subjected to continuous condensation or icing.
Physically the unit is compact and lightweight ( 6 mm body diameter 100 mm 42 mm height, approximately 80 g), and it mounts to the standard Series 65 detector bases (sold separately). This modular approach gives installers choice in base type and simplifies stock management when multiple detector types are used on a site.
Certification to EN54-5 and Series 65 family approvals such as LPCB, VdS and CPR shows the detector meets recognised European performance and manufacturing standards. A 10-year warranty underlines manufacturer confidence and reduces long-term maintenance concerns for property owners.
Use Cases and Scenarios Where the Series 65 CS Excels
Fixed heat detectors like the Series 65 CS are intended for areas where smoke detectors are prone to nuisance alarms or where smoke detection performs poorly. Typical applications include:
- Plant rooms and boiler houses:Dust, soot and combustion fumes make smoke detectors unreliable; the CS heat detector provides robust temperature-based detection.
- Commercial kitchens and canteens:Cooking fumes and transient smoke trigger smoke alarms; a heat detector avoids frequent false alarms while responding to sustained overheating events.
- Garages and vehicle workshops:Diesel and petrol vapours plus particulates can confuse smoke sensors—heat detection is more appropriate.
- Dusty or smoky industrial environments:Manufacturing, processing or storage areas where airborne particles would cause nuisance alarms for optical sensors.
- Enclosed equipment cabinets and machinery spaces:Where heat accumulation is the primary hazard and direct smoke is unlikely as an early indicator.
Because Series 65 detectors are conventional and compatible with standard bases, they are particularly well suited to retrofit projects or buildings with existing conventional fire alarm panels. The wide supply voltage range and polarity-insensitive terminals further simplify installation in diverse power configurations.
How It Compares to Similar Products
When evaluating fixed heat detectors, consider sensor type, activation class, approvals, power requirements and environmental ratings. The Apollo Series 65 CS offers several competitive advantages:
- Thermistor sensing vs alternatives:Thermistor networks typically provide more stable, accurate temperature readings than single-element thermocouples or basic bimetal detectors. This results in fewer false trips and consistent activation at the specified class temperature.
- High temperature class:The CS (90C) rating makes this detector suitable for hotter environments where lower-class devices might trigger nuisance alarms.
- Wide voltage range and low quiescent current:Some competing devices demand tighter voltage tolerances or draw more standby current; Series 65s 93 V range and 250 A quiescent current facilitate greater system flexibility and lower power consumption.
- Certifications and approvals:EN54-5 and Series 65 family approvals (LPCB, VdS, CPR) give assurance of performance and regulatory compliance. Lower-spec or unapproved devices may be less acceptable for regulated installations.
- Installation and maintenance features:Optional flashing LED and magnet test variants make commissioning and periodic testing quicker than some basic fixed heat detectors that lack local test functions.
In short, compared to many fixed heat detectors on the market, the Series 65 CS balances robust detection performance, installer-friendly features and recognised approvals—making it a strong choice for both new installations and retrofits.
Customer Feedback and Typical Reviews
Actual purchaser feedback varies by site and use case. Below are representative, anonymised comments based on typical installations and installer reports. These are illustrative of how end users commonly describe the Series 65 CS:
- Installation contractor:"The polarity-insensitive terminals and broad voltage range saved time on site, and the detector seated cleanly on our standard Series 65 base. No wiring headaches and a quick commissioning process."
- Facilities manager (commercial kitchen):"Since replacing problematic smoke detectors with CS heat units, nuisance alarms dropped to zero. They detect genuine overheating without being triggered by everyday cooking activity."
- Site engineer (manufacturing plant):"Robust build and EN54 approval were major deciding factors. The thermistor sensor feels more reliable in dusty conditions than optical-based options we've tried."
If you require verified case studies or references, ask your Apollo supplier for local project examples or installer testimonials specific to your sector.
Conclusion: Why the Series 65 CS (55000-137APO) Is a Strong Choice
The Apollo Series 65 CS fixed heat detector is a purpose-built solution for environments where smoke detection is unsuitable. Its dual thermistor sensing, CS (90C) activation class, wide supply voltage range and low standby current combine to deliver reliable, installer-friendly heat detection. Approved to EN54-5 and backed by Series 65 family listings (LPCB, VdS, CPR) and a 10-year warranty, it offers regulatory confidence and long-term value. Practical features such as polarity-insensitive terminals, optional flashing LED and magnet test facilities, and compact compatibility with Series 65 bases make it a convenient, cost-effective option for plant rooms, kitchens, garages and other challenging indoor spaces.
Whether you are retrofitting a conventional panel or specifying detectors for a new installation, the Apollo Series 65 CS (55000-137APO) delivers a balanced mix of performance, approvals and practical features that professional installers and facility owners appreciate.
