Apollo 55000-440APO XP95 I.S. Heat Detector

Name: Apollo 55000-440APO XP95 I.S. Heat Detector – Datasheet & Quote
Brand: Apollo
SKU: 55000-440APO

An intrinsically safe heat detector for dirty or smoky areas

The Apollo 55000-440APO is the XP95 Intrinsically Safe (I.S.) heat detector. A single NTC thermistor gives a count output proportional to the external air temperature, linear over 25 C to 90 C. It is ideal for environments that are dirty or smoky under normal circumstances, and it is unaffected by wind or atmospheric pressure.

It shares the common profile of the XP95 I.S. optical smoke detector but has a low air-flow-resistance white polycarbonate case. It connects to a two-wire, polarity-sensitive loop of 14 V to 22 V dc and uses the XP95 native protocol, Discovery compatible.

Technical specifications

Parameter	Specification
Part number	55000-440APO
Detection principle	Linear approximation over 25 C to 90 C; single NTC thermistor, continuous sampling
Sensitivity	1 C per count between 25 C and 90 C; -20 C returns 8 counts
Analogue value at 25 C	25 +/- 5 counts
Supply voltage	14-22 V dc, two-wire, polarity sensitive
Quiescent / surge current	150 microamps; 1 mA for 0.3 s; max power-up time 4 s
Alarm / remote LED current	700 microamps / 500 microamps (internally limited)
Ex classification	Ex ia IIC T4 GA (up to +60 C); Ex ia IIC T5 GA
Certificates	BASEEFA BAS02ATEX1289X; IECEx BAS 12.0091X
Operating temperature	-20 to +45 C (T5); -20 to +60 C (T4)
Storage temperature / humidity	-30 to +80 C; 0-95 % RH
IP rating	IP 44
Dimensions / weight	100 mm diameter x 42 mm height; 105 g
Standards	EN 54-5 vibration, impact and shock; EMC 2014/30/EU; CPR; Marine Equipment 2014/90/EU; ATEX 2014/34/EU

Loop loading and remote indication

A safety barrier is mandatory in an I.S. system, and its high series impedance limits how many I.S. detectors can be fitted. Apollo gives a typical maximum of 20 detectors per I.S. circuit, restricted to 12 optical detectors in an IIC environment, depending on barrier type, devices fitted and the number of detector LEDs the panel illuminates at once.

The detector supplies a remote LED drive point. The remote LED must be a standard high-efficiency red LED and needs no series resistor because current is limited to about 500 microamps. It cannot be controlled independently of the integral LED. The Apollo MiniDisc Remote Indicator 53832-070 is suitable using terminals X and Y.

Selection and what to confirm before ordering

Choose a heat detector where smoke detectors would be unreliable because of normal smoke, dust or steam. The datasheet provides temperature-proportional counts only, so alarm thresholds are set by the control panel. Confirm the mounting base, the I.S. barrier and panel compatibility, and the zone, gas group and temperature class of the installation, because the T4 and T5 ratings carry different ambient limits. A SIL 2 variant (55000-440SIL) is listed separately by the manufacturer, so quote the exact suffix.

The manufacturer specification states that the EMC Directive conformity does not cover connected apparatus. For general-area use see the Apollo 55000-600 XP95 optical smoke detector in the same XP95 family.

Documents and quotation

The manufacturer document for the 55000-440APO is listed under Documents on this page: Apollo PP5029 XP95 I.S. Heat Detector specification (Issue 4, 2026). 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.

Apollo XP95 loop devices

XP95 is the Apollo range of analogue addressable detectors and interfaces. Besides detectors, it includes modules that link the loop to other equipment. The Sounder Control Unit on our site is one of these: it lets the control panel switch and supervise a circuit of conventional sounders fed from an external power supply.

Ordering Apollo devices: what we need

Apollo identifies each device by a part number in the form 55000-000, for example 55000-182 for a DIN-rail sounder control unit. 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.