KWJ Engineering

Interlink Subsidiary

KWJ Engineering

Innovative solutions for gas detection, environmental monitoring, and application-specific engineering services.

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Core Focus

Gas Detection and Environmental Monitoring

Delivery Model

Custom Engineering + Product Integration

KWJ Engineering is part of the Interlink group ecosystem, with ties across gas-sensing organizations including SPEC Sensors and Ecosensors.

Product Catalog

KWJ Engineering designs and manufactures gas detection solutions across seven product categories — from pocket-sized wearable detectors to fixed multi-gas monitoring systems, bare electrochemical sensors for OEM integration, and complete wireless IoT monitoring networks. Products cover 14+ target gases including CO, O3, H2S, H2, CO2, CH4, NO2, and more.

KWJ products are typically engagement-led. Contact the team for pricing, custom configurations, and volume enquiries.

Gases Detected

KWJ instruments and sensors cover a broad spectrum of target gases for safety, environmental, industrial, and medical applications.

CO

Carbon Monoxide

O₃

Ozone

H₂S

Hydrogen Sulfide

H₂

Hydrogen

CO₂

Carbon Dioxide

CH₄

Methane / Natural Gas

NO₂

Nitrogen Dioxide

NO

Nitric Oxide

O₂

Oxygen

N₂

Nitrogen

Cl₂

Chlorine

C₂H₅OH

Ethanol

Freon

Refrigerant Gases

LPG

Propane / LPG

Wearable Instruments

Wearable Instruments

4 products

Personal gas detectors small enough for a keychain or phone case, providing real-time exposure monitoring, dosimetry, and audible/visual alarms for worker safety and personal health.

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Pocket CO 300

Wearable Instruments

Pocket CO 300

The world's smallest carbon monoxide detector, alarm, and dosimeter — monitors low CO levels, collects max/average dosimetry data, and fits on a keychain.

CO

Pocket H2S 300

Wearable Instruments

Pocket H2S 300

The world's smallest and most affordable hydrogen sulfide detector — 0.0 to 50.0 ppm range with dual alarm levels and 8-hour TWA monitoring.

H2S

Pocket Ozone

Wearable Instruments

Pocket Ozone

Compact, portable ozone detection for air quality monitoring — ideal for ozone treatment areas, HVAC systems, and personal safety monitoring.

O3

SPARROW CO & Air Quality Monitor

Wearable Instruments

SPARROW CO & Air Quality Monitor

Smartphone-connected wearable CO and air quality monitor with SPEC Sensors electrochemical sensor, real-time graphing, location mapping, and customizable health alerts.

CO

Portable Instruments

Portable Instruments

6 products

Handheld and field-portable gas detection instruments for leak surveys, compressed air testing, multi-gas analysis, and on-site safety monitoring in industrial and environmental applications.

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A285 Portable Multi-Gas Instrument

Portable Instruments

A285 Portable Multi-Gas Instrument

Portable multi-gas detector for CO, hydrogen, biogas, and CO2 in a weather-resistant Pelican case with AC/DC power and sample flow regulation.

COH2CO2Biogas

634 Pro Surveyor

Portable Instruments

634 Pro Surveyor

Dual-sensor methane and hydrogen gas leak detector with LED meter — 1 ppm through 1% gas range, no field calibration required.

CH4H2

626 Trooper 2

Portable Instruments

626 Trooper 2

Portable gas leak detector for methane, natural gas, and propane — designed for utility companies, arson investigation, and field service applications.

CH4LPG

627 ATV

Portable Instruments

627 ATV

Portable methane and hydrocarbon detector designed for pipeline surveys from vehicles — rugged all-terrain design with extended range.

CH4

923 Portable Hydrocarbon Detector

Portable Instruments

923 Portable Hydrocarbon Detector

Portable instrument for detecting methane, natural gas, propane, and other hydrocarbons in leak detection and safety applications.

CH4LPGHydrocarbons

A356 Portable CO Monitor

Portable Instruments

A356 Portable CO Monitor

Portable carbon monoxide monitor with electrochemical sensor for field safety checks, indoor air quality surveys, and compressed air testing.

CO

Fixed Instruments

Fixed Instruments

6 products

Wall-mounted and surface-mounted continuous monitoring systems for facility safety, biogas plants, compressed air quality, and indoor environmental monitoring with alarm outputs.

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A360 Fixed CO & O2 Monitor

Fixed Instruments

A360 Fixed CO & O2 Monitor

Wall-mounted fixed monitor for continuous carbon monoxide and oxygen detection — 115 VAC, dust-resistant, with alarm relay and digital display.

COO2

A345 Fixed Multi-Gas Monitor

Fixed Instruments

A345 Fixed Multi-Gas Monitor

Fixed multi-gas monitoring system for biogas, CO2, and methane detection in biogas plants, landfills, and wastewater treatment facilities.

CO2CH4Biogas

A241 Fixed Multi-Gas Monitor

Fixed Instruments

A241 Fixed Multi-Gas Monitor

Fixed monitoring system for methane, H2S, and biogas applications — designed for wastewater, biogas digesters, and industrial gas safety.

CH4H2SBiogas

A383 Fixed O2, Methane & Biogas Monitor

Fixed Instruments

A383 Fixed O2, Methane & Biogas Monitor

Fixed instrument for continuous oxygen, methane, and biogas monitoring in agricultural, industrial, and environmental settings.

O2CH4Biogas

A401 Fixed Multi-Gas Monitor

Fixed Instruments

A401 Fixed Multi-Gas Monitor

Comprehensive fixed monitoring for methane, H2S, CO2, and biogas — designed for demanding multi-gas environments requiring continuous surveillance.

CH4H2SCO2Biogas

A269 Fixed Freon Monitor

Fixed Instruments

A269 Fixed Freon Monitor

Fixed monitoring system for Freon/refrigerant gas leak detection in commercial and industrial HVAC, refrigeration, and cold storage facilities.

Freon

Inline Instruments

Inline Instruments

3 products

Instruments designed for continuous monitoring of compressed air and gas supply lines, with digital displays, alarm relays, and 4-20mA analog outputs for process integration.

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A316/A310 Inline Monitor

Inline Instruments

A316/A310 Inline Monitor

Inline CO monitor for compressed air systems — 115 VAC, dust-resistant, digital ppm display, internal alarm relay, and 4-20mA output terminals.

CO

A409 Inline CO Monitor

Inline Instruments

A409 Inline CO Monitor

Inline carbon monoxide monitor for compressed air and gas line applications with continuous digital monitoring and alarm capability.

CO

A333 Inline O2 & N2 Monitor

Inline Instruments

A333 Inline O2 & N2 Monitor

Life-safety inline alarm for bottled gas cylinders (O2, N2, Halocarbon, air) — used in hospitals, clinics, nursing homes, and laboratories.

O2N2

Electrochemical Gas Sensors

Electrochemical Gas Sensors

4 products

Bare electrochemical sensor elements in MFS, R-Series, and T-Series form factors for OEM integration, instrument design, and research applications detecting CO, H2S, NO2, NO, and more.

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CO-MFS Electrochemical CO Sensor

Electrochemical Gas Sensors

CO-MFS Electrochemical CO Sensor

Three-electrode electrochemical carbon monoxide sensor — 0 to 1,000 ppm range, 15.9 x 27.9 mm, 5 grams, <60 second response time.

CO

H2S-MNS Electrochemical H2S Sensor

Electrochemical Gas Sensors

H2S-MNS Electrochemical H2S Sensor

Three-electrode electrochemical hydrogen sulfide sensor — 0 to 500 ppm range, same compact MFS/MNS form factor at 15.9 x 27.9 mm.

H2S

NO2-MNS / NO2-SNL Electrochemical NO2 Sensor

Electrochemical Gas Sensors

NO2-MNS / NO2-SNL Electrochemical NO2 Sensor

Three-electrode electrochemical nitrogen dioxide sensor — 1 to 10 ppm range in the compact MNS form factor for OEM and instrument integration.

NO2

3ET T-Series Nanotechnology Sensors

Electrochemical Gas Sensors

3ET T-Series Nanotechnology Sensors

Ultra-compact nanotechnology-based sensors — 0.57-inch square footprint, under 2 grams, T90 response under 30 seconds, developed from TTI merger.

COH2S

OEM Sensor Modules

OEM Sensor Modules

2 products

Signal-conditioned sensor modules combining electrochemical sensing elements with ultra-low-power analog front ends, producing calibrated voltage outputs for seamless OEM integration.

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ULPSM-CO Sensor Module

OEM Sensor Modules

ULPSM-CO Sensor Module

Ultra-Low Power Sensor Module for carbon monoxide — combines a SPEC Sensors electrochemical element with an analog front end producing linear voltage output at microwatt power.

CO

ULPSM-CO V2 Sensor Module

OEM Sensor Modules

ULPSM-CO V2 Sensor Module

Second-generation Ultra-Low Power CO Sensor Module with improved signal processing and smaller form factor for next-generation OEM integration.

CO

Wireless Sensor Networks

Wireless Sensor Networks

4 products

Complete IoT wireless gas monitoring solutions — battery-powered sensor modules, USB/Ethernet/Cellular gateways, and a web-based dashboard with SMS and email alarm notifications.

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Sensor Integration for Smart City Infrastructure

Wireless Sensor Networks

Sensor Integration for Smart City Infrastructure

Application-specific sensor integration program for smart-city infrastructure, combining field deployment strategy with connected gas sensing architecture.

Multi-gas

KWJ-WSN CO Wireless Sensor Module

Wireless Sensor Networks

KWJ-WSN CO Wireless Sensor Module

Wireless carbon monoxide sensor module — detects 0 to 1,000 ppm CO in ambient air, transmits wirelessly to the KWJ-WSN Dashboard, coin-cell battery powered.

CO

KWJ-WSN USB Gateway

Wireless Sensor Networks

KWJ-WSN USB Gateway

USB gateway that connects KWJ wireless sensor modules to PC software or online monitoring — bridges sensor network to the KWJ-WSN Dashboard.

KWJ-WSN Ethernet Gateway

Wireless Sensor Networks

KWJ-WSN Ethernet Gateway

Ethernet gateway for the KWJ wireless sensor network — plugs directly into a network port, no PC required, connects to the online monitoring system.

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