Overview

Ultraviolet photometry analyzer has 2 measuring ranges as ppm or Vol.-%, and can also realize high-precision up to ppb range. It can measure 2 gas components simultaneously by using 2 UV-LEDs. Nitrogen oxides (NO+NO2), hydrogen sulphide(H2S), ozone(O3), sulphur dioxide(SO2) and chlorine(Cl2) can be measured.

Principle

Working principle:

UV photometry is based on the absorption of radiation in the spectral range from 200 nm to 400 nm. In this field, a number of important industrial gases have distinct absorption bands. 

The advantage of this gas analysis is that the measurements are not interfered with by vapors and carbon dioxide. In addition, these absorption bands show high absorption behavior and therefore can also be reliably detected at very low gas concentrations (<< ppm). In UV spectrometers, UV light-emitting diodes are chosen, whose emission wavelengths correspond spectrally to the corresponding absorption bands. This means that no other spectrometer or filter is required. This type of UV photometry is called non-dispersive UV method, also known as NDUV.

Basic structure:

The UV-LED radiation is split into a measurement and a reference path through a beam splitter. The reference beam reaches the detector directly, which converts it into a reference voltage value. Using this reference signal, the aging effect of the UV-LED is almost completely compensated. The measurement beam enters the cuvette, where the gas in the cuvette is absorbed by the radiation therein. The absorption behavior is recorded by the measurement detector and used to calculate the concentration of the gas in the measuring cuvette. The UV spectrometer is designed in such a way that the radiation components from several UV LEDs can also be coupled into the photometer. This means that multiple gases can be determined simultaneously by the UV spectrometer.

The measurement of nitrogen monoxide (NO) requires a selective UV radiation source in the spectral range around 226nm. For this purpose a gas discharge lamp filled with NO is used, which emits precisely the radiation that is required for the NO measurement. In this context, one speaks of resonance absorption. The process also referred to as UVRAS (UV Resonance Absorption Spectrometry).

Application

• Environmental and Process Measurement Technology (CEM)

• Engine development 

• Elemental analysis 

• Industrial gas analysis 

• Natural gas/biogas analysis 

• Process measurement technology 

• Biogas research

Features

• Linearity error: ±0.5%FS or 1 % F.S

• Sensor sample cell: stainless steel with inert coating (inside and outside)

• PEEK cell for corrosive gases (H2S, chlorine) on request 

• High dynamic range, 1:100

• Fast response time, t90 < 1 s possible 

• No water vapour cross sensitivity different to NDIR gas sensors 

• Convenient

    The navigation menu contains 6 languages, which can be operated easily.

• Process safety

    7" large size color LCD touch screen, convenient and safe touch operation and debugging

    Large size screen with red flashing alarm, clearly visible from long distances and in dark areas

    Alarm immediately, safe the process

• Data alarm record

    Real-time data curve display

    Record function for up to 6000 alarms

• Optional mass flow measurement and controller

• Expert calibration function

   Multi-point calibration function up to 9 point

• Powerful self-diagnosis function

    Built-in heartbeat monitoring function and watchdog

    Monitor the status of analyzer and sensors, and promptly remind customers to take necessary maintenance

    High-standard hardware and software security and password protection

• Powerful control function

    High(low) limit control function

    Optional: Timer control(automatic cleaning) function

    Optional: analog PID control function

    Optional: PWM control function

• Flexible fieldbus communication functions for IOT4.0

    Optional fieldbus MODBUS, HART, Foundation Fieldbus FF, PROFIBUS PA, PROFIBUS DP, etc.

• ATEX EExd II CT4 Optional

Measurement components and ranges

• SO2:  0 ~ 10ppm up to 10%(Vol) 

• NO:   0~ 300ppm up to 5,000ppm 

• NO2:  0 ~ 10ppm up to 5,000ppm

• O3:   0 ~ 1ppm up to 2,000ppm

• Cl2:   0 ~ 100ppm up to 30%(Vol)

• H2S:  0 ~ 100ppm up to 1% 

Product datasheet: Ultraviolet photometry analyzer , if you need more information, please contact us at info@mzdd.de.

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