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Numens -Â Model 402-003 -non-addressable Gas Alarm
402-003 non-addressable gas alarms are suitable for connection to 2-wire non-addressable fire detection control and indicating equipment. 402-003 detectors can also connect to addressable fire detection control and indicating equipment that can accept non-addressable detectors . Advanced electronics in conjunction with a semiconductor gas sensor provide early detection of natural gas with high immunity against unwanted alarms. The 402-003 gas alarm range provides fire detection and alarm system designers with a Standards-compliant, economical gas detector for life safety and property protection applications.· Advanced algorithms provide advanced detection discrimination
· Stable gas sensing chamber. No adjustment or replacement required
· High immunity against unwanted alarms
· Surface-mount device (SMD) circuit board design
· 2-wire operation
· Audible warning signal of an internal fault
· Easy installation. No programming required
· Connectable to zone monitor for use with addressable control and indicating equipment
· Sleek, low-profile housing design
· Low maintenance
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402-003 |
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Operating voltage |
DC (10.8 ~ 33) V |
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Start-up current |
≤ 100 µA |
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Start-up time |
≤ 10 min |
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Quiescent current |
50 µA |
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Quiescent condition indicator |
Green LED flashing every 5 s |
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Sampling time |
(2 ~ 4) s |
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Alarm response threshold |
(0.10 ±0.04)LEL CH4 (natural gas) |
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Alarm condition indicator |
Red LED |
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Alarm current (max) |
50 mA @ DC 24 V |
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Reset voltage |
≤ 1 V |
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Reset time |
≤ 5 s |
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Internal fault indication |
Single short audible signal every 30 s |
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Operating temperature |
(-10 ~ +50)°C |
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Operating humidity |
(0 ~ 95)% RH, non-condensing |
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Storage temperature |
(-25 ~ +80)°C |
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Storage humidity |
(0 ~ 98)% RH, non-condensing |
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Dimensions (excluding contacts) |
Φ 102 mm × 45 mm |
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Ingress protection rating |
IP-42 |
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EN 50194 a, c |
UL 1484 b, c |
CE |
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402-003 |
√ |
√ |
√ |
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402-004 |
√ |
√ |
√ |
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a EN 50194 Electrical apparatus for the detection of combustible gases in domestic premises. Test methods and performance requirements b UL 1484 Residential gas detectors cThird-party conformance assessment has not been undertaken. |
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