Core Focus
Gas Detection and Environmental Monitoring
Interlink Subsidiary
KWJ Engineering
Innovative solutions for gas detection, environmental monitoring, and application-specific engineering services.
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.
Gas Sensing Technology for Industry, Community, Health & Home
Innovative solutions for gas detection
KWJ Engineering provides custom solutions, advanced sensors, innovative products, and unique services in environmental monitoring. The team builds products for detecting and monitoring gases including carbon monoxide, ozone, hydrogen sulfide, and additional environmental pollutants.
As an Interlink Electronics subsidiary, KWJ combines specialist gas-sensing expertise with broader group support for manufacturing scale, commercialization, and long-term product lifecycle support.
Founded in 1993, KWJ expanded in 2007 through a merger with Transducer Technology and in 2008 through acquisition of Eco Sensors, extending deep experience in product and sensor development.
Gases Detected
KWJ instruments and sensors detect 14+ target gases across 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
Solution Focus Areas
Browse All ProductsKWJ instruments and modules are used across smart cities, smart homes, personal wearables, and IoT applications. These four focus areas summarize current demand and engineering direction.
Personal Safety & Wearables
Pocket-sized CO, H2S, and ozone detectors for firefighters, first responders, HVAC technicians, and anyone working in hazardous gas environments.
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Pipeline & Leak Detection
Portable methane, hydrogen, and hydrocarbon leak detectors for utility companies, pipeline surveys, and arson investigation.
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Facility & Industrial Monitoring
Fixed and inline multi-gas monitoring systems for biogas plants, hospitals, compressed air quality, and industrial process safety.
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IoT & Wireless Networks
Complete wireless sensor network platforms with battery-powered modules, gateways, and web-based dashboards for distributed gas monitoring.
ExploreProduct Categories
Seven product tiers — from pocket-sized wearable detectors to complete wireless monitoring networks — let engineers and safety professionals choose the right solution for their application.
Wearable Instruments
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.
Portable Instruments
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.
Fixed Instruments
Wall-mounted and surface-mounted continuous monitoring systems for facility safety, biogas plants, compressed air quality, and indoor environmental monitoring with alarm outputs.
Inline Instruments
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.
Electrochemical Gas Sensors
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.
OEM Sensor Modules
Signal-conditioned sensor modules combining electrochemical sensing elements with ultra-low-power analog front ends, producing calibrated voltage outputs for seamless OEM integration.
Wireless Sensor Networks
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.
Engineering Services
Research and development is core to KWJ Engineering. Teams support product lifecycles from concept through mass manufacturing, with custom paths for traditional and emerging gas detection applications.
- Custom product development for gas detection systems
- Sensor module and instrument design from concept to production
- Circuit design and optimization for sensitivity and stability
- Characterization, compensation, testing, and calibration
- Firmware and algorithm development for embedded sensing
- Enclosure integration and manufacturing-ready implementation
Technical Depth
KWJ's multidisciplinary team enables specialized gas-sensing products with practical deployment constraints in mind, including calibration, manufacturability, and long-term field stability.
Chemical engineering
Mechanical engineering
Electrochemistry
Electrical engineering
Sensor design
Nanotechnology
Metrology
Embedded programming
Featured Products
Representative products spanning wearable detectors, portable leak surveyors, inline monitors, nanotechnology sensors, and wireless IoT modules.
Pocket CO 300
The world's smallest CO detector and dosimeter — key-fob sized with audible alarm and exposure tracking.
View productSPARROW CO & Air Quality Monitor
Smartphone-connected wearable with real-time CO monitoring, GPS mapping, and health alerts via iOS app.
View product634 Pro Surveyor
Dual-sensor methane and hydrogen leak detector — 1 ppm to 10,000 ppm range, no field calibration required.
View productA316/A310 Inline Monitor
Continuous compressed air CO monitoring with digital display, alarm relay, and 4-20mA output.
View product3ET T-Series Nanotechnology Sensors
Ultra-compact 0.57-inch nanotechnology sensors weighing under 2 grams with sub-30-second response.
View productKWJ-WSN Wireless CO Module
Battery-powered wireless CO sensor transmitting to cloud dashboard with SMS/email alerts.
View productAbout KWJ Engineering
Part of the Interlink Electronics group
KWJ Engineering was founded in 1993 by Ken Johnson in Newark, California after selling his previous company GasTech to Thermo Electron. In 2007 KWJ merged with Dr. Joseph Stetter's Transducer Technology, Inc. (TTI), adding nanotechnology-based sensor R&D. In 2008 KWJ acquired Eco Sensors, a leader in ozone detection instrumentation.
Interlink Electronics acquired KWJ Engineering and SPEC Sensors in December 2022, adding Silicon Valley engineering talent, a multi-decade gas sensing IP portfolio, and approximately $4 million in trailing revenue to the Interlink group.
Location & Contact
Newark, California
8430 Central Ave, Suite C, Newark, CA 94560. KWJ's facility houses sensor manufacturing, custom product development, calibration laboratories, and the engineering team that supports all KWJ and Eco Sensors product lines.
Contact Engineering TeamInterlink Gas Sensing Ecosystem
Complete gas sensing solutions across the Interlink group
KWJ Engineering is part of Interlink's connected gas sensing ecosystem alongside SPEC Sensors, Ecosensors, and Sparrow Sensors. Together these divisions cover the full stack — from raw electrochemical sensor elements and signal-conditioned modules through complete instruments, ozone monitoring platforms, and consumer-grade connected wearables.