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Brand: Apollo
Apollo 55000-122 Series 65 A1R Heat Detector
Description
A conventional rate-of-rise heat detector family
The Apollo 55000-122 is the Series 65 Heat Detector class A1R in its standard version. Series 65 heat detectors monitor temperature with a dual thermistor network, or a single thermistor on the CS versions, giving a voltage output proportional to the external air temperature. They are ideal for environments that are dirty or smoky under normal circumstances and can be used where smoke detectors are unsuitable.
In the dual-thermistor versions one thermistor is exposed and the other is thermally insulated. Under stable conditions both read the same, and when air temperature rises quickly the ratio of resistances is monitored and an alarm is initiated, which gives the rate-of-rise response. The datasheet also covers B, C and CS classes and flashing-LED versions, listed below.
Technical specifications
| Parameter | Specification |
|---|---|
| Series 65 versions | A1R 55000-122 (flashing LED 55000-121); BR 55000-127 (-126); CR 55000-132 (-131); CS 55000-137 (-136) |
| Max application / static response | A1R 50 C / 65 C; BR 65 C / 85 C; CR and CS 80 C / 100 C |
| Operating temperature | A1R -20 to +50 C; BR -20 to +65 C; CS/CR -20 to +80 C |
| Supply voltage | 9 V to 33 V, two-wire monitored, polarity insensitive |
| Alarm voltage / holding | 6 V to 28 V dc; holding voltage 6 V, holding current 10 mA |
| Alarm load | 420 ohm in series with a 2 V drop |
| Quiescent / alarm current (A1R) | 45 microamps / 52 mA at 24 V; 40 microamps / 17 mA at 9 V |
| Minimum voltage to light LED | 12 V; remote output is a current sink limited to 17 mA |
| Storage temperature / humidity | -30 to +80 C; 0-95 % RH, no condensation or icing |
| IP rating | IP54 |
| Dimensions / weight | 100 mm diameter x 42 mm height; 80 g |
| Materials | White flame-retardant polycarbonate; nickel-plated stainless steel terminals |
| Approvals | CPR, LPCB, VdS, FG, BOSEC (not all detectors have all approvals) |
Choosing the right class
The datasheet gives a selection path. Where the maximum ambient temperature is above 65 C, use the CS detector, or the CR where a sudden temperature increase is expected. Where the maximum temperature is above 50 C use the BR, and where sudden increases occur and the maximum is below 50 C use the A1R. A1R detectors are intended for normal indoor ambient conditions up to 50 C.
Each class is available as standard or with a flashing LED. The remote indicator output, the 17 mA sink, and the holding voltage and current figures are given for the control panel designer.
What to confirm before ordering
Confirm the class (A1R, BR, CR or CS) against maximum ambient temperature and rate-of-rise behaviour, the standard or flashing LED version, the base and the panel zone compatibility. Check which approvals apply to the exact part number, since the datasheet notes that not all detectors have all approvals.
This page uses the A1R standard part 55000-122 as the lead model with the other classes listed above as variants; quote the exact part number when requesting prices.
Documents and quotation
The manufacturer document for the 55000-122 is listed under Documents on this page: Apollo PP2614 Series 65 Heat Detector specification (Issue 2, 2025). Browse related items in Fire & Gas Detectors. For price, availability and lead time, send an RFQ with the exact part number, quantity and project details; Seven Star LLC is an independent supplier based in Muscat and confirms stock and delivery on quotation.
See also: Apollo 55100-940 XP95 I.S. Manual Call Point.
Datasheets & Documents
- Datasheet Apollo PP2614 Series 65 Heat Detector specification (Issue 2, 2025) Download
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About brand
Apollo Fire Detectors is a British manufacturer of smoke, heat and multi-sensor fire detectors, interfaces and sounders, based in Havant, Hampshire. The company was incorporated in 1980 and joined the Halma group in 1984. Its detectors are designed and made in the UK and used with fire alarm panels from many independent panel makers in more than 100 countries.
Seven Star LLC is an independent supplier in Muscat. We list Apollo detectors and loop devices for fire alarm contractors and maintenance teams in Oman and the GCC.
Apollo company profile
| Founded | 1980, Havant, Hampshire, United Kingdom |
|---|---|
| Headquarters | Havant, United Kingdom |
| Ownership | Halma plc, since 1984 |
| Protocols | Conventional, XP95, Discovery and Soteria analogue addressable protocols |
| Product families | Soteria, Discovery and XP95 optical, heat and multi-sensor detectors, Orbis conventional detectors, manual call points, input/output interfaces, sounders and beacons |
Milestones
- 1980: The company is incorporated in Havant.
- 1984: Halma acquires Apollo.
- 2020: Apollo marks 40 years of fire detector manufacturing.
Apollo product series
XP95 is Apollo's analogue addressable range. Listed devices include the 55000-600 optical smoke detector, intrinsically safe versions of the optical smoke detector (55000-640APO), heat detector (55000-440APO) and manual call point (55100-940), the 55000-280 IR2 flame detector and its flameproof 55000-295 version, and the XP95 sounder control unit. Soteria is the newer addressable range, represented by the SA5100-600 optical smoke detector, the SA5100-700 optical heat multisensor and the Soteria Dimension FL5100-600APO.
Conventional devices include the Orbis I.S. optical smoke detector, the Series 65 A1R heat detector, the 55000-064 UV/IR2 flame detector and the Fireray One beam detector for large open spaces.
Where Apollo devices are used
Commercial and public buildings, industrial plants and warehouses, and hazardous areas in oil and gas facilities, where intrinsically safe and flameproof versions are installed with suitable barriers or isolators.
Apollo products we list
Ordering Apollo devices: what we need
Apollo identifies each device by a part number in the form 55000-000. Send that number, the range name printed on the device, the quantity and the make and model of your control panel. For detectors, state whether mounting bases are needed and which type; for hazardous areas, state the zone and the barrier or isolator in use.
Facts checked against UK Companies House records, Halma company history and trade press, October 2026.
Browse Apollo products by category: Fire & Gas Detectors.
FAQ
Questions about the Apollo 55000-122 Series 65 A1R Heat Detector
Answers from our engineering team on installation, compatibility and integration.
01What is the 55000-122?
The Apollo Series 65 A1R heat detector in standard form, a rate-of-rise conventional heat detector.
02What other Series 65 heat classes exist?
BR (55000-127), CR (55000-132) and CS (55000-137), each also available with a flashing LED.
03What supply does it use?
9 V to 33 V on a two-wire monitored, polarity-insensitive circuit.
04What is the A1R maximum application temperature?
50 C, with a 65 C maximum static response temperature.
05What is the IP rating?
IP54.
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