Forensics 4 Gas Wall-Mount Monitor — CO, H2S, O2 & LEL (Relay Output)

Forensics 4 Gas Wall-Mount Monitor — Fixed CO, H2S, O2 & LEL

The Forensics 4 gas wall-mount monitor reads CO, H2S, O2 and combustible LEL from a single fixed head — a fixed gas detection system that covers all four atmospheric hazards continuously and drives ventilation or shutdown through its relay output.

Jump to: Features · Specs · What it detects · Comparison · FAQ

The Forensics 4 Gas Wall-Mount Monitor is a fixed, continuously-monitoring detector for CO, H2S, O2 and combustible LEL, with relay output and NIST-traceable calibration.

Key features

• Monitors all four atmospheric hazards — CO, H2S, O2 and combustible LEL — from one fixed head
• Continuous wall-mounted coverage of an unattended space
• Relay output drives ventilation, alarms or shutdown
• Adjustable audible and visual alarms per gas
• USA NIST-traceable calibration
• The all-in-one fixed solution where several gases are a risk

Specifications

Where the Forensics 4 Gas Wall-Mount Monitor fits

• Wastewater and pump stations
• Confined or below-grade plant rooms
• Parking and loading areas (CO)
• Digesters and tanks (H2S, O2)
• Any space with multiple gas hazards

What the Forensics 4 Gas Wall-Mount Monitor detects (and what it doesn’t)

This monitor covers CO, H2S, O2 and combustible LEL — the four atmospheric hazards — but not VOCs, CO2 or specific toxics like chlorine. For a single combustible point use the Forensics EX LEL Detector; for hydrogen the Hydrogen Detector. Mount it considering each gas’s density and the room layout, and tie the relay into ventilation or shutdown. It protects the installed space; entrants still need a Portable Gas Detectors instrument for pre-entry testing and a Personal & Wearable Gas Detectors clip during work.

Cross-shopping? This unit sits in our Fixed Gas Detection Systems hub alongside Forensics EX/LEL Wall-Mount, Forensics Hydrogen Wall-Mount, Macurco PM100-CO, Macurco GBC-24-2. For other gas-detection form factors see Portable Gas Detectors, Personal & Wearable Gas Detectors, Area & Transportable Gas Monitors, or browse the full Gas Detectors range.

Forensics fixed wall-mount family compared

• Choose the 4 Gas Wall-Mount Monitor when a space has several gas hazards and you want one fixed head.
• For combustibles only, the EX LEL Detector costs less.
• For battery-room hydrogen, use the Hydrogen Detector.

Frequently asked questions

What gases does the Forensics 4 gas wall-mount monitor detect?

CO, H2S, O2 and combustible LEL — the four atmospheric hazards — continuously, from one fixed head. It does not detect VOCs or specific toxics like chlorine.

Why choose a fixed 4-gas monitor over single-gas heads?

One unit covers all four hazards, simplifying installation and wiring where several gases are a risk. For a single hazard, a dedicated head like the EX LEL Detector costs less.

What is the relay output used for?

It triggers external action — ventilation, remote alarms or equipment shutdown — when any monitored gas reaches its set point.

Where should it be mounted?

Position it considering each gas's density and the room's release points and occupied zones; below-grade and enclosed plant rooms are common applications.

Is it NIST calibrated?

Yes — USA NIST-traceable calibration; plan periodic recalibration of each sensor with the appropriate calibration gas.

Can it replace portable detectors for entry?

No — pre-entry testing still needs a Portable Gas Detectors instrument. The fixed monitor provides continuous coverage of the installed space.

Does it monitor oxygen deficiency?

Yes — oxygen is one of its four channels, alarming on deficiency (and typically enrichment) alongside CO, H2S and combustibles.

How is it powered and installed?

It is a hard-wired fixed monitor; installation and relay wiring should follow local electrical code and any area-classification requirements.

What does it not detect?

VOCs, CO2 and specific toxics such as chlorine or ammonia. For a single combustible point use the EX LEL Detector; for hydrogen the Hydrogen Detector.

Is it in stock and how does it ship?

Use the Amazon buy button for current availability and delivery timing through our fulfillment partner.

Can it drive building ventilation automatically?

Yes — that is a core use of the relay output: energise exhaust or a shutdown circuit when gas reaches the alarm level.

How many heads does a facility need?

One per area near its release points; larger or multi-room facilities add heads positioned by airflow and gas density, often wired to a central controller.