Instrunexus – Toxic vs Combustible Gas Simulator
Professional Interactive Training Tool | www.instrunexus.comwww.instrunexus.com
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Gas Type Selection
Measurement Unitppm
Density vs AirHeavier (1.19)
Hazard TypeToxicity
Sensor TypeElectrochemical
TLV-TWA1 ppm
IDLH50 ppm
Sensor Active
Electrochemical – ppm
Electrochemical – ppm
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Concentration Control
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Alarm & Safety Logic
SAFE ZONE
Concentration within safe limits
SAFE
LOW ALARM – 10 ppm
First warning threshold
OFF
HIGH ALARM – 20 ppm
Evacuate immediately
OFF
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Visual Gas Simulation
Gas Cloud
Breathing Zone
Safe Area
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Sensor Response Panel
Electrochemical Sensor
0
ppm
Toxic Hazard Level
0%
Hazard %
Response Time
T90
~30s
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Comparison Panel – ppm vs %LEL
Measurement
☠ ppm (Toxic)
🔥 %LEL (Combustible)
Primary Hazard
Human Toxicity
Fire / Explosion
Sensor Type
Electrochemical
Catalytic Bead
Response
Parts-per-million
% of Lower Explosive Limit
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Gas Dispersion Profile
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Heavier than Air
Gas settles at ground level and in low-lying areas. Monitor at floor level. Pit and trench accumulation risk.
Flammable RangeNon-flammable
Detection ZoneGround Level
Wind EffectAccumulates
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Zone Indicator
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Live Data Log
— Simulation not started —
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Learning Panel – Key Concepts
LEL/UEL Flammability Range
The Lower Explosive Limit (LEL) is the minimum gas concentration that can sustain combustion. Below LEL = too lean; above UEL (Upper Explosive Limit) = too rich. Detection at 20% LEL provides early warning before reaching flammable range.
TLV Toxic Exposure Limits
TLV-TWA (8-hour time-weighted average) indicates safe daily exposure. STEL (Short-Term Exposure Limit, 15 min) prevents acute effects. IDLH (Immediately Dangerous to Life/Health) requires immediate escape. All expressed in ppm.
SENSOR Selection Philosophy
Toxic gases use Electrochemical sensors (highly specific, ppm range). Combustible gases use Catalytic Bead (Pellistor) sensors (%LEL). Photoionization Detectors (PID) suit VOCs. Match sensor to gas density, application zone, and hazard type.