Description

Apollo Discovery Carbon Monoxide Detector – 58000‑300APO

The Apollo Discovery Carbon Monoxide (CO) Fire Detector incorporates a long‑life electro‑chemical carbon monoxide sensor that is tolerant of low levels of common vapours and household products. The sensing technology is fast, accurate, and requires very low power.

Detection performance is enhanced by a rate‑sensitive response. Rapid increases in carbon monoxide levels, typically associated with hot fires, result in an earlier response. The analogue signal from the detector is rate‑limited to reduce nuisance alarms caused by short‑term high CO levels from sources such as pipe smokers or gas flame ignition.

Operation

The Discovery CO detector features five operating modes, each with a specific combination of sensitivity and response delay. The appropriate mode can be selected by the user for the intended application.

Application

CO detectors do not detect smoke particles or heat and are not universal replacements for smoke detectors.

Apollo does not recommend the use of CO detectors as the primary method of fire detection where:

• The protected area is an escape route
• There is a requirement to detect overheating of electrical equipment or cables
• The protected area is exposed to sources of CO (e.g. vehicle exhausts), hydrogen, or high levels of alcohol vapour from cleaning agents
• There is a requirement to detect fires involving flammable liquids

CO fire detectors are particularly suitable for supplementing smoke detection where there is:

• A risk of deep‑seated smouldering fires
• A risk of fire starting in an enclosed space
• A likelihood of stratification occurring

CO detectors may be used as the primary fire detector where:

• The main fire risk is smouldering fires
• Optical smoke detectors are unsuitable
• The fire compartment does not exceed 50m²

Typical applications include hotel bedrooms, halls of residence, sheltered accommodation, and hospital wards.

Drift Compensation

Due to the inherent stability of CO cells, Discovery CO detectors do not require drift compensation. The detector is set to report a drift value of 16.

Cell Test

The Discovery CO detector includes a remote test feature to verify that the electro‑chemical cell is fitted and active. Testing should be carried out at least annually, and preferably more frequently, to ensure the cell has not dried out. The test does not affect the cell, even if performed daily.

If the detector returns a pre‑set analogue value of 25 during testing, this indicates sensor failure. The detector should then be returned to Apollo’s Service Department for cell replacement and recalibration. A 30‑second delay should be observed when carrying out the cell test.

Precautions When Investigating Alarms

Carbon monoxide is a colourless, odourless gas that cannot be detected by human senses. If a CO detector enters alarm condition, a potentially dangerous level of CO may be present. Extreme caution must be exercised when investigating alarms, even if no combustion products are visible or detectable by smell.

CO fire detectors must be clearly identified at the fire control panel so that appropriate safety precautions can be taken.

Communication

Discovery detectors use a digital communications protocol developed from XP95. Unlike XP95, Discovery allows communication in three modes:

• Normal Mode – Operates similarly to XP95, with re‑defined analogue value bits enabling the fire control panel to distinguish between Discovery and XP95 devices.
• Read Mode – Allows the fire control panel to access information stored in the detector’s non‑volatile memory.
• Write Mode – Enables the fire control panel to write information to the detector.

During Read or Write modes, the detector can signal an alarm using alarm flag and alarm address bits.

Discovery detectors are compatible with XP95 and Soteria systems. However, Discovery features are not available when used with XP95 fire control panels. Fire control panels incorporating drift compensation algorithms should disable these algorithms when communicating with Discovery devices.

For fire control panels operating with CoreProtocol, refer to the control panel manufacturer’s operating instructions.

Product Specification
Specifications are given at 23°C and 50% relative humidity unless stated otherwise.

Product Code:	58000-300
Detector Principle:	Ambient carbon monoxide level
Supply Wiring:	Two-wire supply, polarity sensitive
Terminal Functions:	L1 -ve & L2 +ve: Supply in and out connections, +R: Remote indicator positive connection  (internal 2.2kΩ resistance to positive)
Operating voltage:	17-28V DC
Communication protocol:	Apollo Discovery 5-9V to peak to peak
Quiescent current:	300µA
Power-up surge current:	1mA
Maximum power-up time:	10 seconds
Alarm current, LED illuminated:	3.5mA
Remote output characteristics:	Connects to positive line through 4.5kΩ (5mA maximum)
Sampling Frequency:	1 per seconds
Clean-air analogue value:	25±2
Alarm level analogue value:	55
Alarm indicator:	2 red Light Emitting Diodes (LEDs); illuminated red in alarm; optional remote LED
Storage temperature:	Continuous: +10°C to +30°C – Transient: -40°C – +55°C
Operating temperature:	Continuous: 0°C to 50°C – Transient: -20°C to +55°C
Storage Pressure:	If air freighted this product should be places in a pressurised hold.
Operating pressure:	Suitable for installation up to 2,000m above sea level
Operating Humidity:	Continuous 15% to 90% RH; Transient 0% to 99% RH
Effect of temperature on detector:	Less than 15% change in sensitivity over rated range
Effect on wind:	None
Cell Life:	Maximum 7 Years (assumes regular checks are satisfactory)
Vibration, Impact & Shock:	To EN54
IP rating:	54 in accordance with BSEN60529
Dimensions (D x H):	100 x 42mm, 100 x 50mm (Height in Base)
Weight:	Detector: 105g – Detector in Base: 160g
Materials	Housing: White polycarbonate V-0 rated to UL94 – Terminals: Nickel plated stainless steel