TX 401M-NDIR Point Gas Detector For Hydrocarbons and CO2 - ATEX II 2GD - EEx d IIC
3-wire 4-20mA + RS485 Modbus + 3 alarm relays + 18-bit microprocessor
Real non intrusive + one man local calibration and configuration
Measuring Principle
Detection principle based on measuring the absorption of infrared radiation passing through a volume of gas using a single beam dual detector method.
Dual pyroelectric detector with each individual detector (reference an active) optically filtered by integral windows to respond to specific bands of infrared radiation.
The optical filter associated with the active detector transmits radiation within a band of infrared wavelengths (1 to 5 μ) that are absorbed by the target gases.
The optical filter associated with the reference detector transmits radiation within a neutral band of infrared wavelengths unaffected by target gases. The reference detector therefore acts to monitor the throughput of infrared radiation and compensates for any changes in incident radiation that are not caused by absorption due to the target gases. The reference detector also provides a first means of temperature compensation.
TX401M-NDIR Advantages
- Extremely robust IP66 flameproof aluminium dye casting junction box with yellow chromatic epoxy painting RAL 1007. Optional AISI 316L stainless steel execution.
- 3-pieces removable AISI 316L sensor enclosure for easy replacement of the sensor
- ?All weather? IP65 sensor protection with integrated calibration adapter.
- Ideal for harsh environment as chemical and petrochemical industry, offshore oil and gas platforms, onshore oil and gas terminals, refineries, LNG/LPG storage and bottling plants, bio-ethanol plants, solvent and painting industry, Industrial hygiene & safety monitoring, Soil contamination and remediation, Landfill, Biogas and Biomass applications, Hazmat sites and spills, waste water, paper and pulp, ...
- All-in-one detector: 5 digit display, 4 LED status alarm, 4-20mA output, RS485 half/full duplex Modbus RTU, 3 freely programmable alarm relays, automatic temperature compensation, non-intrusive one man local calibration
- Heated optics avoiding condensation
- Continuous monitoring of detector failure en sensor operation en life time.
Infrared Advantages
Safe operation - Immune to catalytic poisoning - Good response time - Extremely long operating life - Works in inert atmospheres - High reliability, no moving parts - High stability - Low long term drift
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