Description

Gastec GOA-40D-5 Hand-Held Oxygen Detector

Gastec GOA-40D-5 Hand-Held Oxygen Detector is a lightweight, portable galvanic cell oxygen monitor engineered for fast, accurate oxygen concentration testing in industrial tanks, confined spaces, manholes, and processing plants. Designed by Gastec Corporation, the Gastec GOA-40D-5 Hand-Held Oxygen Detector features a remote sampling cable assembly, clear digital display, dual acoustic/visual alarm thresholds, and long battery life. Designed for occupational safety and environmental monitoring, it provides real-time oxygen deficiency and enrichment alarms to safeguard personnel entering hazardous environments.

Technical Overview & Operation

The Gastec GOA-40D-5 Hand-Held Oxygen Detector utilizes a high-stability galvanic cell sensor to determine ambient oxygen concentrations ( $0.0\% \ \text{to} \ 25.0\% \ O_2$ ). Oxygen molecules diffusing through the sensor membrane react electrochemically to generate a small electric current proportional to partial oxygen pressure.

The internal microprocessor processes this current to display real-time percentage volume readouts on a clear backlit digital screen. The 5-meter extendable sensor cable enables safe pre-entry sampling inside underground vaults, storage tanks, and sewer shafts before workers step inside. If oxygen levels drop below safe thresholds (typically $< 19.5\%$ $O_2$ ) or exceed enrichment levels ( $> 23.5\%$ $O_2$ ), high-decibel buzzers and LED warning indicators activate immediately.

Specifications

Parameter	Specification
Manufacturer / Brand	Gastec Corporation
Model Series	GOA-40D Series / GOA-40D-5
Focus Keyword Target	Gastec GOA-40D-5 Hand-Held Oxygen Detector
Detection Gas	Oxygen ( $O_2$ )
Sensor Principle	Galvanic Cell Sensor
Measuring Range	$0.0% text{to} 25.0% O_2$ (Vol %)
Measurement Accuracy	$pm 0.7% O_2$ (under constant environmental conditions)
Response Time ( $T_{90}$ )	$le 20 text{seconds}$
Standard Sampling Cable Length	5 meters (16.4 ft)
Alarm Signals	Audible Buzzer ( $ge 80 text{dB}$ ) and Red Flashing LEDs
Power Source	AA Alkaline Batteries (Continuous operation up to 500+ hours)
Operating Temperature Range	-10°C to +40°C (+14°F to +104°F)

Features

Galvanic Cell Sensing: High-precision electrochemical sensor provides stable, immediate oxygen concentration readings without warm-up delays.
5-Meter Remote Sampling Cable: Standard 5-meter extension cable allows safe pre-entry gas testing of confined spaces prior to personnel entry.
Dual Audio-Visual Alarms: Loud audible buzzer paired with bright LED indicators alerts workers instantly to oxygen deficiency ( $< 19.5%$ ) or enrichment ( $> 23.5%$ ).
Compact Portable Design: Lightweight, handheld chassis fits comfortably in palm or belt holster for field operations.

Applications

Confined Space Entry Safety: Pre-entry oxygen screening for sewer manholes, underground utility vaults, storage tanks, and silos.
Chemical & Petrochemical Refineries: Monitoring storage vessel atmospheres during maintenance purges and nitrogen blanketing operations.
Marine & Cargo Hold Inspection: Oxygen content checks inside ballast tanks, ship holds, and fuel storage compartments.
Mining & Tunnelling Operations: Continuous worker safety monitoring for atmospheric oxygen depletion in underground galleries.

Gastec GOA-40D-5 Hand-Held Oxygen Detector

Technical Overview & Operation

The Gastec GOA-40D-5 Hand-Held Oxygen Detector utilizes a high-stability galvanic cell sensor to determine ambient oxygen concentrations (

0.0\% \ \text{to} \ 25.0\% \ O_2

). Oxygen molecules diffusing through the sensor membrane react electrochemically to generate a small electric current proportional to partial oxygen pressure.

< 19.5\%

O_2

) or exceed enrichment levels (

> 23.5\%

O_2

), high-decibel buzzers and LED warning indicators activate immediately.

Parameter

Specification

Manufacturer / Brand

Gastec Corporation

Model Series

GOA-40D Series / GOA-40D-5

Focus Keyword Target

Gastec GOA-40D-5 Hand-Held Oxygen Detector

Detection Gas

Oxygen (

O_2

)

Sensor Principle

Galvanic Cell Sensor

Measuring Range

0.0% text{to} 25.0% O_2

(Vol %)

Measurement Accuracy

pm 0.7% O_2

(under constant environmental conditions)

Response Time (

T_{90}

)

le 20 text{seconds}

Standard Sampling Cable Length

5 meters (16.4 ft)

Alarm Signals

Audible Buzzer (

ge 80 text{dB}

) and Red Flashing LEDs

Power Source

AA Alkaline Batteries (Continuous operation up to 500+ hours)

Operating Temperature Range

-10°C to +40°C (+14°F to +104°F)

Features

Galvanic Cell Sensing: High-precision electrochemical sensor provides stable, immediate oxygen concentration readings without warm-up delays.

5-Meter Remote Sampling Cable: Standard 5-meter extension cable allows safe pre-entry gas testing of confined spaces prior to personnel entry.

Dual Audio-Visual Alarms: Loud audible buzzer paired with bright LED indicators alerts workers instantly to oxygen deficiency ( $< 19.5%$ ) or enrichment ( $> 23.5%$ ).

Compact Portable Design: Lightweight, handheld chassis fits comfortably in palm or belt holster for field operations.

Applications

Confined Space Entry Safety: Pre-entry oxygen screening for sewer manholes, underground utility vaults, storage tanks, and silos.

Chemical & Petrochemical Refineries: Monitoring storage vessel atmospheres during maintenance purges and nitrogen blanketing operations.

Marine & Cargo Hold Inspection: Oxygen content checks inside ballast tanks, ship holds, and fuel storage compartments.

Mining & Tunnelling Operations: Continuous worker safety monitoring for atmospheric oxygen depletion in underground galleries.

Gastec GOA-40D-5 Hand-Held Oxygen Detector

Product Note:

Description