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GAS DETECTION

Gas Detection & Safety Device Design

HEFA Teknoloji provides technical R&D partnership to manufacturers developing gas detection devices — covering sensor selection, electronic design, embedded software, and system architecture.

We handle end-to-end engineering for CO detectors, industrial gas detection devices, parking CO/NO₂ monitoring systems, and gas monitoring panels with 4–20 mA / RS485 Modbus communication. Our goal: transform your technical requirements into a manufacturable, stable, field-reliable product.

Gas Detection Application Areas

Gas detection systems impose different engineering requirements depending on the application. Fixed-mount systems, residential devices, and multi-channel panels each require distinct architectural approaches.

Parking CO & NO₂ Monitoring Systems
  • Electrochemical sensor-based CO and NO₂ measurement devices
  • Multi-sensor network architecture
  • Monitoring panels with RS485 communication
  • RS485 Modbus RTU communication panels

Sensor stability, TWA alarm algorithms, and system reliability are critical engineering topics in parking gas monitoring.

Residential CO Detector Development
  • Electrochemical CO sensor integration
  • Low-noise analog front-end (AFE) design
  • Time-weighted alarm algorithms
  • Low power consumption architecture

Drift compensation and measurement stability are fundamental design criteria in CO detector design.

Industrial Gas Detection Device Design
  • Flammable/explosive gas detection (pellistor / catalytic sensors)
  • Toxic gas detection (electrochemical sensors)
  • Fixed-mount or portable device architecture
  • Analog front-end circuit design for sensors
  • 4-20mA and RS485 Modbus RTU communication integration
  • Alarm threshold and hysteresis management
  • Sensor fault and disconnection detection

Measurement accuracy, calibration strategy, and safe alarm behaviour are fundamental criteria in industrial gas detection device design.

Gas Monitoring & Alarm Panels
  • Multi-channel monitoring architecture
  • 4–20 mA analog communication integration
  • RS485 Modbus RTU communication integration
  • Panel design with or without display
  • Fault and alarm relay outputs
  • Event logging

Long cable line resilience, measurement accuracy, and fail-safe alarm scenarios are considered in panel design.

Gas Sensor Technologies & Selection Criteria

Sensor selection is a critical design decision that shapes the entire electronics architecture. For each application, we evaluate cross-sensitivity, temperature coefficient, ageing characteristics, signal conditioning requirements, and calibration approach.

Electrochemical

CO, NO₂, H₂S, O₃ and toxic gas detection

Pellistor / Catalytic

Flammable and explosive gas detection

MOS

Metal oxide semiconductor gas sensing

NDIR

Non-dispersive infrared for CO₂ and hydrocarbons

Gas Detection Project Development Flow

01

Technical requirement analysis and application definition

02

Sensor technology selection and characterisation

03

Analog front-end and sensor driver circuit design

04

Microcontroller and firmware architecture definition

05

PCB design and prototype production

06

Calibration protocol and test procedure development

07

Safety and alarm behaviour validation testing

08

Production readiness and serial manufacture preparation

System-Level Design in Gas Detection Devices

Gas detection device development goes beyond sensor integration — every system block must be engineered with deliberate design decisions.

  • Sensor driver circuit and analog front-end (AFE) optimisation
  • Drift and ageing compensation at hardware and firmware level
  • Field-applicable calibration strategy and temperature compensation algorithm
  • Safe dimensioning of alarm thresholds and hysteresis logic
  • Sensor fault detection: cable break, sensor poisoning, and failure management
  • Fail-safe alarm behaviour: safe-state transitions on power loss and communication failure

A gas detection device is a system where sensor, analog front-end, firmware, and alarm algorithm must all be optimised together. We approach this entire system from a single engineering perspective — not just PCB design.

Looking for Full-Cycle Engineering Partnership?

Beyond gas detection — for hardware, firmware, communication, and production-readiness covering the entire device lifecycle:

End-to-End Sensor-Based Device Development →

Who We Work With

Gas detection device manufacturersCO detector manufacturersCompanies developing industrial safety equipmentManufacturers developing gas monitoring panelsCompanies looking to redesign existing gas monitoring devices

Frequently Asked Questions

Which gas sensor technologies do you work with?
We work with electrochemical sensors (CO, NO₂, H₂S, O₃), pellistor/catalytic sensors (flammable and explosive gases), MOS (metal oxide semiconductor) sensors, and NDIR sensors (CO₂, hydrocarbons). Sensor selection is based on cross-sensitivity, temperature behaviour, ageing effects, and calibration strategy.
Can you develop both residential CO detectors and industrial gas detection devices?
Yes. We have experience developing residential CO detectors with electrochemical sensors and low-power architecture, as well as fixed and portable industrial gas detection devices with 4–20 mA and RS485 Modbus RTU interfaces.
What communication outputs do you support in gas monitoring panels?
We develop gas monitoring panels with RS485 Modbus RTU and 4–20 mA analog communication outputs. Panels can include a display or be display-free, with fault and alarm relay outputs and event logging.
How do you address sensor drift in gas detectors?
Drift compensation is addressed at both hardware and firmware levels. The analog front-end is optimised for sensor stability, and calibration strategies with temperature compensation algorithms are incorporated to maintain long-term measurement accuracy.
Do you develop complete gas monitoring systems including detectors and panels?
Yes. We develop individual gas detection devices as well as complete gas monitoring systems including multi-sensor network architectures, central monitoring panels, and communication infrastructure.
How is a 4-20mA output designed in gas detectors?
A 4-20mA analog output maps gas concentration to a constant current loop, preserving signal integrity over long cable runs. The design covers the current-source circuit, definitive current levels for fault states (2 mA or 22 mA), and cable-open/short-circuit detection. When combined with Modbus, RS485 isolation and line termination are also addressed.
What are the architectural differences between fixed-mount and portable gas detection devices?
Fixed-mount devices are designed for continuous mains power, 4-20mA or RS485 communication, and high MTBF targets — long-term stability and low maintenance cost are the primary criteria. Portable devices prioritise battery management, low-power sleep modes, compact PCB layout, and fast field calibration. Both architectures require different sensor conditioning strategies and alarm management approaches.

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