Alphasense CO-CE Electrochemical Carbon Monoxide Sensor (Smoke-Resistant, High-Range)

Overview

The Alphasense CO-CE is a high-performance electrochemical gas sensor engineered for reliable, continuous detection of carbon monoxide (CO) in demanding industrial and environmental monitoring applications. Based on a three-electrode amperometric cell architecture, the sensor operates via controlled oxidation of CO at the working electrode, generating a current proportional to gas concentration. Its design incorporates proprietary catalytic electrode formulations and diffusion-limiting membranes that significantly suppress interference from common combustion by-products—including NO₂, SO₂, H₂S, and hydrocarbons—making it uniquely suited for smoke-laden or flue-gas environments where conventional CO sensors exhibit drift or poisoning. Unlike standard low-range CO sensors (typically 0–1,000 ppm), the CO-CE is optimized for high-concentration measurement up to 10,000 ppm, with validated linearity over 0–500 ppm and robust tolerance to transient exposures exceeding 100,000 ppm without permanent degradation.

Key Features

• High-range capability: Full-scale output calibrated to 10,000 ppm CO, supporting applications such as boiler flue monitoring, landfill gas analysis, and industrial process safety.
• Smoke-resistant electrode chemistry: Engineered catalyst layer and hydrophobic membrane reduce fouling and cross-sensitivity to particulate-laden exhaust streams.
• Stable baseline performance: Low zero-current drift (<±2 ppm equivalent over 30 days under stable conditions) and minimal temperature coefficient (±0.05 ppm/°C typical).
• Fast dynamic response: t₉₀ ≤ 75 seconds across the full range, enabling timely alarm activation in rapidly evolving hazardous scenarios.
• Compact cylindrical form factor (Ø20.2 × 23 mm): Compatible with standard 19-mm socket mounts and OEM gas module integration.
• Long service life: Rated for 24 months of continuous operation under specified environmental conditions; shelf life of 6 months when stored unpowered at 20–25 °C and <60 %RH.

Sample Compatibility & Compliance

The CO-CE sensor is intended for use in ambient air, diluted stack gases, and ventilated industrial headspaces. It is not rated for direct insertion into undiluted high-temperature flue gases (>60 °C) or corrosive acid-gas streams (e.g., wet HCl or HF). When integrated into certified analyzers, the sensor supports compliance with EN 45544-1:2019 (electrochemical gas detectors for workplace monitoring) and meets functional safety requirements per IEC 61508 SIL 2 when deployed in redundant configurations. Its linear response and documented repeatability support traceability under ISO/IEC 17025-accredited calibration protocols. No intrinsic certification (e.g., ATEX, IECEx) is embedded in the sensor itself; system-level certification remains the responsibility of the end-equipment manufacturer.

Software & Data Management

As a transducer-level component, the CO-CE outputs an analog current signal (typically 0–200 nA at full scale) requiring external signal conditioning. When paired with Alphasense’s AS-Interface or third-party gas controller platforms (e.g., Dynament GCS, Systech UV-2000), it supports digital compensation for temperature and humidity via onboard thermistor (NTC 10 kΩ) and optional RH sensor inputs. Raw output data is compatible with SCADA systems using Modbus RTU or analog 4–20 mA conversion. For regulatory environments governed by FDA 21 CFR Part 11 or EU Annex 11, full audit trails—including calibration history, sensor replacement logs, and drift verification records—must be maintained at the host instrument level; the CO-CE itself does not store or transmit metadata.

Applications

• Fixed-point CO monitoring in boiler rooms, incinerator control systems, and biomass combustion facilities.
• Portable multi-gas detectors for confined space entry (permit-required) where high CO exposure risk coexists with smoke or incomplete combustion signatures.
• Environmental emission monitoring systems (CEMS) requiring extended-range CO quantification upstream of catalytic converters or scrubbers.
• Research-grade combustion diagnostics, including engine exhaust characterization and pyrolysis off-gas profiling.
• Fire detection augmentation in early-stage smoldering scenarios where CO rises before significant smoke or heat generation.

FAQ

What is the recommended calibration frequency for the CO-CE sensor?

For critical safety applications, bump testing is advised before each use; full two-point calibration (zero and span) should occur every 30–90 days depending on exposure history and regulatory requirements.
Can the CO-CE operate continuously at 50 °C?

Yes—its specified operating upper limit is +50 °C, but prolonged exposure near this threshold may accelerate electrolyte evaporation; active thermal management is recommended above 40 °C.
Does the sensor require a warm-up period before stable readings?

A 30-minute stabilization period is recommended after power-on or extended storage to ensure consistent baseline and sensitivity.
Is the CO-CE compatible with PID or NDIR-based instruments?

No—it is exclusively an electrochemical transducer and must be interfaced with dedicated potentiostatic circuitry; it cannot be substituted into optical-based platforms.
How does the CO-CE handle hydrogen interference?

It exhibits <5 % cross-sensitivity to H₂ at concentrations up to 1,000 ppm, which is mitigated through factory compensation and optional algorithmic correction in host firmware.