Apollo 55000-500APO XP95 Ionisation Smoke Detector

The Apollo 55000-500APO XP95 Ionisation Smoke Detector is an analogue addressable smoke detector designed for Apollo XP95-compatible fire alarm systems. It uses an ionisation sensing chamber to provide rapid response to fast-burning, flaming fires.

The detector operates on a two-wire, polarity-insensitive addressable circuit and uses Apollo’s XPERT card addressing system. A red integral LED provides local alarm indication.

Product Functions

• Provides analogue addressable smoke detection
• Uses ionisation smoke-sensing technology
• Responds rapidly to fast-flaming fires
• Designed for Apollo XP95 systems
• Uses XPERT card addressing
• Provides individual detector identification
• Two-wire, polarity-insensitive operation
• Integral red alarm LED
• Compatible with standard and relay detector bases
• Designed for a broad range of environments
• Provides low standby current
• Uses a removable plug-in detector design

Ionisation Smoke Detection

The 55000-500APO uses a low-activity radioactive foil within its sensing chambers.

The foil ionizes the air inside the detector, creating a small electrical current. When smoke enters the chamber, this current decreases. The detector measures the change and communicates the resulting analogue value to the compatible fire alarm control panel.

Fast-Flaming Fire Detection

Ionisation technology is particularly responsive to the small combustion particles produced by fast-burning and flaming fires.

This makes the 55000-500APO suitable for applications where rapid detection of this type of fire signature is important.

XP95 Addressable Operation

The detector belongs to Apollo’s XP95 analogue addressable family.

Each detector communicates with the compatible fire alarm control panel over the addressable loop, allowing the system to identify the specific detector reporting an alarm.

The XP95 platform provides both alarm information and individual detector location identification.

XPERT Card Addressing

The 55000-500APO uses Apollo’s XPERT card addressing system.

The coded address card is installed in the detector base. When the detector is inserted, it reads the address from the base.

This allows replacement detector heads to retain the existing location address without manually reprogramming the replacement detector.

Alarm LED

The detector incorporates an integral:

Red Alarm LED

The LED illuminates when the detector enters an alarm condition, providing local visual confirmation of detector activation.

Compatible Detector Bases

Compatible bases include:

45681-210APO — XP95 Standard Mounting Base

45681-242APO — XP95 Low-Power Relay Base

The plug-in base architecture allows the detector head to be removed or replaced without disturbing the installed field wiring.

Electrical & Detection Information

Model: 55000-500APO

Series: XP95

Device Type: Addressable Ionisation Smoke Detector

Detection Technology: Ionisation

Operating Voltage: 17–28 VDC

Quiescent Current: 280 µA average

Peak Quiescent Current: 500 µA

Alarm Current: Approximately 2 mA with LED illuminated

Supply Wiring: Two-wire, polarity insensitive

Status Indicator: Red alarm LED

Addressing: XPERT Card

Base: Separately ordered.

Product Status

The 55000-500APO is a legacy/obsolete Apollo XP95 detector. Some current suppliers identify the 58000-500APO Discovery Ionisation Smoke Detector as its replacement.

For existing systems, control-panel protocol, detector-base compatibility, and applicable local requirements should be verified before selecting a replacement.

55000-500APO Datasheet