55000-440APO is the Apollo XP95 I.S. (intrinsically safe) heat detector, classified A2S. It is an analog addressable detector from the XP95 range built for hazardous areas, where it is connected to the loop through a mandatory safety barrier. A single thermistor reports a count proportional to the surrounding air temperature, which suits areas that are normally dirty or smoky.
Specifications
| Part number |
55000-440APO |
| Range |
XP95 I.S., native XP95 protocol, compatible with Discovery |
| Classification |
A2S |
| Sensor |
Single NTC thermistor, continuous sampling |
| Detection principle |
Linear approximation from 25 °C to 90 °C, 1 °C per count |
| Supply voltage |
14 to 22 VDC, two-wire, polarity sensitive |
| Quiescent current |
150 µA |
| Power-up surge |
1 mA for 0.3 s; maximum power-up time 4 s |
| Alarm indicator |
Red LED, 700 µA; remote LED current 500 µA (internally limited) |
| Terminals |
L1 positive supply; L2 negative supply and remote LED negative; +R remote LED positive |
| Hazardous area classification |
Ex ia IIC T4 Ga and Ex ia IIC T5 Ga (ambient up to +60 °C) |
| Certificates |
BASEEFA BAS02ATEX1289X; IECEx BAS12.0091X |
| Operating temperature |
-20 °C to +45 °C (T5); -20 °C to +60 °C (T4) |
| Storage temperature |
-30 °C to +80 °C |
| Humidity |
0 to 95% RH |
| IP rating |
IP44 |
| Dimensions |
100 mm diameter x 42 mm height |
| Weight |
105 g |
| Material |
White flame-retardant polycarbonate housing; nickel-plated stainless steel terminals |
Compatibility and installation notes
- A safety barrier is a mandatory part of an I.S. system. Apollo states a typical I.S. circuit carries up to 20 detectors (12 optical detectors in an IIC environment), depending on barrier type, devices fitted and how many detector LEDs the control panel lets illuminate at once.
- The remote LED is wired in series with the integral LED and cannot be controlled separately from it, as it can on standard XP95 detectors.
- A remote LED indicator and its terminations need at least IP20 protection and segregation from other circuits per BS EN 60079-14.
- Intended for hazardous areas, dusty environments, refineries and offshore platforms.
Related models
Documents
Specifications from Apollo datasheet PP5029/2026 Issue 4. Manufacturer specifications are subject to change.
