Forsensal 4 Gas Detector with Pump (CO, EX/LEL, O2, H2S, Calibration Kit)

Forsensal 4 Gas Detector with Pump — Sample-Draw CO, EX, O2 & H2S

The Forsensal 4 gas detector with pump brings sample-draw testing to a budget price — a portable gas detector that pumps a remote sample of oxygen (O2), combustible gas (LEL), carbon monoxide (CO) and hydrogen sulfide (H2S) and ships with a calibration kit and a 3000mAh battery, aimed at crews who need a pump without the premium-instrument cost.

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The Forsensal 4 Gas Detector with Pump is a rechargeable electrochemical four-gas instrument (CO, EX/LEL, O2, H2S) with a built-in sample-draw pump and an included calibration kit, built for confined-space pre-entry testing.

Key features

• Built-in pump for sample-draw testing of sewers, tanks and confined spaces
• Reads oxygen (O2), combustible gas (LEL), carbon monoxide (CO) and hydrogen sulfide (H2S) — written CO, EX, O2 and H2S on the unit
• Large 3000mAh rechargeable battery for extended runtime
• Includes a calibration kit so you can verify accuracy out of the box
• Audible, visual and vibration alarms
• LCD display with belt clip for portable use

Specifications

Where the Forsensal 4 Gas Detector with Pump fits

• Sewer and drain gas sampling
• Confined-space pre-entry testing on a budget
• Tank and vault checks
• Maintenance and utility work
• Backup pump unit for a tool crib

What the Forsensal 4 Gas Detector with Pump detects (and what it doesn’t)

It detects oxygen (O2), combustible gas (LEL), carbon monoxide (CO) and hydrogen sulfide (H2S) and uses a built-in pump to draw remote samples — handy for sewers, drains and tanks. It does not read VOCs, CO2 or single toxics like chlorine or ammonia; those need a PID or dedicated sensor. The included calibration kit lets you verify accuracy; still bump-test before use. For a NIST-certified pump alternative, compare the Forensics Detectors 4 Gas Monitor with Pump. For single-worker wear, add a clip from Personal & Wearable Gas Detectors.

Cross-shopping? This unit sits in our Portable Gas Detectors hub alongside the Forensics Detectors 4 Gas Meter, Forensics Detectors USB 4 Gas Monitor, TopTes Guard-863Pro, TopTes Guard-101. If one worker needs all-shift wear instead of a carried meter, see Personal & Wearable Gas Detectors; for a fixed install or a job-site perimeter, see Fixed Gas Detection Systems and Area & Transportable Gas Monitors.

How the Forsensal pump detector compares

• Choose the Forsensal 4 Gas + Pump for the lowest-cost way to get sample-draw plus an included calibration kit.
• Step up to the Forensics Detectors 4 Gas Monitor with Pump if you need a NIST certificate and probe for formal permit programs.
• If you do not need a pump at all, the diffusion TopTes Guard-101 costs less.

Frequently asked questions

What gases does the Forsensal 4 gas detector with pump detect?

It reads oxygen (O2), combustible gas (LEL), carbon monoxide (CO) and hydrogen sulfide (H2S) (labelled CO, EX, O2 and H2S on the unit). For VOCs you need a separate PID; see the Portable Gas Detectors hub.

Does the Forsensal come with a calibration kit?

Yes — it includes a calibration kit so you can verify accuracy out of the box. You should still bump-test before each use with four-gas calibration gas.

What is the pump for?

The built-in pump draws a remote sample so you can test a sewer, drain, tank or confined space before anyone enters, rather than relying on diffusion of the air around the unit.

How big is the battery?

It uses a 3000mAh rechargeable battery for extended runtime across long shifts and pump operation.

How does it compare to the Forensics pump monitor?

The Forsensal is lower cost and includes a calibration kit; the Forensics 4 Gas Monitor with Pump adds a NIST certificate and probe, which formal permit programs often require.

Can I use it for confined-space entry?

Yes — its sample-draw pump and O2/CO/H2S/LEL set suit pre-entry testing. Follow the standard sequence: oxygen first, then combustibles, then toxics.

Is it NIST calibrated?

It includes a calibration kit but is not sold with a NIST certificate as standard. If you need documented NIST calibration, choose the Forensics pump monitor.

Does the pump need maintenance?

Yes — keep the pump path and probe clean and free of moisture and debris so samples draw correctly, and check flow per the instructions.

What alarms does it have?

Audible, visual and vibration alarms trigger when any monitored gas exceeds its set point.

What does it not detect?

No VOCs, CO2 or gas-specific toxics like ammonia or chlorine. For VOC work, use a PID — see the Portable Gas Detectors hub.

Is it in stock and how does it ship?

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

Do I still need a personal monitor?

For per-worker exposure, yes — pair it with a wearable clip from Personal & Wearable Gas Detectors; the pump unit handles pre-entry and shared testing.