Configurable gas channels
Supports simultaneous detection of one to four gases, depending on installed sensors and the selected configuration.
G40S Portable Multi-Gas Detector
Portable Gas Detection · Industrial Safety
The G40S Portable Multi-Gas Detector is a compact, diffusion-sampling instrument designed for industrial gas-hazard awareness. Configurable for simultaneous monitoring of one to four gases, it supports different sensor selections for confined spaces, maintenance and general industrial safety applications.
- 1–4 simultaneous gas channels
- Natural diffusion sampling
- Audible, visual and vibration alarms
- High-resolution LCD display
- Compact handheld design
- Configurable monitoring functions
Typical Gas OptionsLEL · O₂ · H₂S · CO · NH₃
Sampling MethodNatural diffusion
Product TypePortable multi-gas detector
Manufacturer / BrandOtywell
The gases monitored simultaneously, measurement ranges and available options depend on the ordered sensor configuration.
G40S · Portable Safety Instrument
Portable Multi-Gas Detection for Industrial Workplaces
The Otywell G40S is a portable gas detector for checking airborne hazards during industrial operations, equipment inspection and entry into confined spaces. The device uses natural diffusion sampling and an LCD display, with audible, visual and vibration alarm functions to alert the wearer when configured alarm conditions are reached.
The detector can be configured for one to four gas channels. The manufacturer lists combustible-gas (LEL), oxygen (O₂), hydrogen sulfide (H₂S), carbon monoxide (CO) and ammonia (NH₃) among the available detection options. A particular unit detects only the gases included in its installed sensor configuration.
01 / Product Highlights
Key Features
Designed for field safety monitoring, the G40S combines a portable form factor with configurable gas channels and alarm functions.
Natural diffusion
Measures gas entering the detector naturally through its sensing openings, without a built-in sampling pump.
Three alarm modalities
Provides audible, visual and vibration alarm indications to alert personnel to configured conditions.
LCD concentration readout
A high-resolution dot-matrix LCD presents gas measurement information and device status.
Configurable data functions
The manufacturer lists storage for up to 30,000 data records, with configurable recording intervals and modes.
Additional connected-safety options
The manufacturer lists inter-device linking, wireless communication and positioning functions; availability must be confirmed for the ordered configuration.
02 / Engineering Data
Technical Specifications
Reference specifications from the manufacturer’s G40S product listing. The ordered model, firmware, sensor package and market version may affect available functions.
| Parameter | G40S Manufacturer Listing |
|---|---|
| Product type | Portable gas detection alarm / multi-gas detector |
| Simultaneous channels | 1–4 gases, depending on configuration |
| Sampling method | Natural diffusion |
| Display | High-resolution dot-matrix LCD |
| Alarm indication | Sound, light and vibration |
| Power supply | DC 3.7 V |
| Battery | 3,000 mAh rechargeable lithium-ion battery |
| Charging time | Less than 5 hours (manufacturer listing) |
| Operating temperature | −25°C to +55°C |
| Relative humidity | 20–93% RH |
| Pressure | 86–106 kPa |
| Dimensions | 120 × 56 × 31 mm (L × W × H) |
| Weight | Approximately 210 g |
| Data records | Up to 30,000 records (manufacturer listing) |
Specifications vary with the selected gas sensor, installed features and product version. Confirm the exact configuration when selecting an instrument for a regulated or hazardous worksite.
03 / Configurable Detection
Detection Gas Options & Measuring Ranges
Common gas options shown in Otywell’s G40S product listing include the following. These are individual option reference ranges, not a statement that every G40S unit includes all gases or ranges.
| Detection Option | Manufacturer-Listed Reference Range | Typical Resolution Listed |
|---|---|---|
| Combustible gas (LEL) | 0–100% LEL | 1% LEL |
| Oxygen (O₂) | 0–30% vol | 0.1% vol |
| Hydrogen sulfide (H₂S) | 0–100 ppm | 1 or 0.1 ppm, depending on sensor |
| Carbon monoxide (CO) | 0–1,000 ppm | 0.1 or 1 ppm, depending on sensor |
| Ammonia (NH₃) | 0–100 ppm | 1 or 0.1 ppm, depending on sensor |
Sensor selection, alarm levels, measuring ranges and available gas combinations should be specified for the actual worksite. The manufacturer also lists other possible gases and ranges; confirm those options individually before ordering.
04 / Use Environments
Typical Applications
The G40S is intended for portable industrial gas monitoring where workers need a personal instrument to monitor selected atmospheric hazards.
Confined Space Entry
Personal monitoring for tank, vessel and other confined-space work, using a gas configuration selected for the entry hazards and applicable procedures.
Petrochemical & Industrial Plants
Portable monitoring during maintenance, routine inspection and work in areas where flammable or toxic gas exposure may occur.
Marine & Ship Operations
Monitoring in ship engine rooms, cargo holds and tank-inspection tasks, subject to vessel procedures and required approvals.
Utilities & Maintenance
Field gas monitoring during maintenance and inspection where the selected sensor channels match the expected hazards.
05 / Equipment Selection
How to Specify a G40S Configuration
Choosing the detector should begin with the monitoring task, not only the device model number. The following information helps define a suitable configuration.
- Target gas and atmosphere: Identify oxygen deficiency/enrichment, combustible gases and specific toxic gases that require monitoring.
- Measuring range: Choose a range appropriate for expected concentrations and the alarm function; confirm the configured sensor’s response and limitations.
- Number of channels: Specify which gases must be monitored simultaneously, within the model’s one-to-four-channel configuration.
- Operating environment: Review temperature, humidity, dust/water exposure and applicable explosion-protection requirements.
- Communication and recording: Confirm whether optional wireless networking, positioning or data logging is required.
- Inspection and calibration: Plan bump tests, calibration, sensor replacement and periodic maintenance according to the applicable site procedure and manufacturer’s instructions.
06 / Common Questions
Frequently Asked Questions
How many gases can the G40S detect at the same time?
The manufacturer lists a configurable one-to-four-gas design. The gases measured at the same time depend on the sensors installed in the ordered device. A list of available gas options does not mean every device measures all of them.
Does the G40S use pump sampling or natural diffusion?
The G40S product listing specifies natural diffusion sampling. For pre-entry remote sampling through tubing, confirm whether a different pump-equipped model is required.
What are the common gas options for the G40S?
Otywell lists combustible gas (LEL), oxygen (O₂), hydrogen sulfide (H₂S), carbon monoxide (CO) and ammonia (NH₃) among the configurable options. Specify the required channels and measuring ranges before ordering.
Is the G40S suitable for confined-space work?
It is positioned for confined-space and industrial worksite monitoring, but suitability depends on the actual gas hazards, sensor configuration, functional checks, worksite procedures and required approvals. Personal monitoring does not replace an appropriate confined-space entry program.
Can the G40S support data logging or connected functions?
Its published product information lists data recording and possible communication/positioning options. Confirm which are included in the specific hardware and firmware version being supplied.
How should a G40S be maintained?
Follow the manufacturer’s current instructions for charging, inspection, bump testing, calibration and sensor replacement. A bump test checks that gas reaches the sensor and the detector responds; it is not the same as a full accuracy calibration.