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Módulos ultravioleta MultiGas NDUV
Description
The RITTER »MultiGas« UV sensor is the world’s first gas analysis module based on miniaturized UV-LEDs. The stability and lifetime of these UV-LEDs enables high-precision gas analysis down to the ppm range. By using two UV-LEDs two gases can be detected simultaneously. Furthermore, with this approach measuring ranges from ppm to Vol.-% can be realized.
In the spectral range from 200 nm to 500 nm, nitrogen oxides (NO + NO2), aromatic hydrocarbons, hydrogen sulphide, ozone, sulphur dioxide and chlorine can be reliably detected with this new sensor platform.
The entire unit can be disassembled for easy maintenance/service.
The individual internal modules are sealed by means of O-ring connections.
In order to achieve an optimum adaptation to the required measuring range, the lengths of the modular measurement cells (= cuvettes) can be implemented in the range of 5 mm (large measurement range in percentage level) up to 250 mm (small measurement range in ppm level).
Cuvettes with a length ≥ 20 mm are coated with a resistant gold layer in order to improve the reflection properties for low concentration level detection. Cuvettes used with aggressive gases are gold-coated as well.
The internal mechanical parts are made out of aluminium, optionally out of stainless steel.
For fast response applications the measuring system delivers a stable result within t90 ≈ 1-2 seconds.
Applications
Specifications NDUV Sensor
General features
Measurement technology: Innovative NDUV Sensor
(non-dispersive ultraviolet sensor) Detectable gases: Number of simultaneously detectable gases: max. 2 Measurement ranges: Flow rate range: 1 ltr/d ~ 300 ltr/h
For higher flow rates the sensor can be operated in bypass Max. gas inlet pressure: 300 mbar Pressure loss (without additional optional sensors): 10 @ 100 / 35 @ 200 / 70 @ 300 (mbar @ ltr/h) Temperature compensation: Yes Data acquisition software: Yes Lifetime of UV radiation source: > 8 000 h Measurement cuvette: Stainless steel with silicone coating inside Cuvette sealing: Viton O-ring Internal tubing: FKM / Viton (fluorinated rubber) Casing: High-quality table-top casing, aluminium Dimensions (W x H x L): 464 x 189 x 305 mm Weight: approx. 6.5+ kg Gas connections: PVDF screw-type tube connection for tube Øi 4 mm, Øo 6 mm Measuring response
Linearity error: < ± 1% F.S. Repeatability: ± 0.5% F.S. Long term stability zero N2: < ± 1% F.S. / 24 h Long term stability span: < ± 1% F.S. / month Temperature influence of zero point: < 1% F.S. / 10K Temperature influence of span: < 2% F.S. / 10K Cross sensitivity: < 2% F.S. Pressure influence: < 1.5% / 10 hPa of reading Warm-up time: 1 min (initial), <60 min for full specification Response time (t90): 1.5 – 15 sec Sampling frequency by software: ≤ 10 Hz Detection limit: Resolution: 0.5 x detection limit Electrical features
Power supply: 24 VDC incl. power plug 100 ~ 240 VAC
50/60 Hz: 24 VDC Supply current (peak) <0.4 A Average power consumption < 7.5 W Interface: USB (standard), RS232 / CANbus / CANopen (options)
incl. data transmission cable 1 m Analogue voltage output (option): 0-2 V / 0-5 V / 0-10 V Climatic conditions
Operating temperature: +25 ~ +45 °C Storage temperature: –20 ~ +60 °C Operating pressure: 800 ~ 1200 hPa (mbar) Ambient humidity: 0 ~ 95% rel. humidity
Condensing inside of sensor must be prevented!
The H2S sensor works according to the principle of non-dispersive UV absorption (NDUV). The measuring wavelength used is in the lower nanometer range, which enables inter-ference-free measurements with water vapour and hydrocarbons. This makes the sensor ideal for use in biogas measurements, as accompanying gases such as NH3, CO2, CH4 and H2O do not affect the accuracy of the measurements.Specifications H2S Sensor
General features
Measurement technology: Innovative NDUV Sensor
(non-dispersive ultraviolet sensor)
Dual beamDetectable gases: Number of simultaneously detectable gases: max. 2 Measurement ranges: Flow rate range: 6 ~ 300 ltr/h
For higher flow rates the sensor can be operated in bypassMax. gas inlet pressure: 300 mbar Pressure loss (without additional optional sensors): 10 @ 100 / 35 @ 200 / 70 @ 300 (mbar @ ltr/h) Temperature compensation: Yes Data acquisition software: Yes Lifetime of UV radiation source: > 8 000 h Measurement cuvette: Stainless steel with silicone coating inside Cuvette sealing: Viton O-ring Internal tubing: FKM / Viton (fluorinated rubber) Casing: High-quality table-top casing, aluminium Dimensions (W x H x L): 300 x 100 x 81 mm Weight: approx. 1670 g Gas connections: PVDF screw-type tube connection for tube Øi 4 mm, Øo 6 mm Measuring response
Linearity error: < ± 1% F.S. Repeatability: ± 0.5% F.S. Long term stability zero N2: < ± 1% F.S. / 24 h Long term stability span: < ± 1% F.S. / month Temperature influence of zero point: < 1% F.S. / 10K Temperature influence of span: < 2% F.S. / 10K Cross sensitivity: < 2% F.S. Pressure influence: < 1.5% / 10 hPa of reading Warm-up time: 1 min (initial), < 15 min for full specification Response time (t90): 1.5 – 15 sec Sampling frequency by software: ≤ 10 Hz Detection limit: Resolution: 0.5 x detection limit Electrical features
Power supply: 24 VDC incl. power plug 100 ~ 240 VAC
50/60 Hz: 24 VDCSupply current (peak): <0.4 A Average power consumption: < 7.5 W Interface: USB (standard), RS232 / CANbus / CANopen (options)
incl. data transmission cable 1 mAnalogue voltage output (option): 0-2 V / 0-5 V / 0-10 V Climatic conditions
Operating temperature: +5 ~ +45 °C Storage temperature: –20 ~ +60 °C Operating pressure: 800 ~ 1200 hPa (mbar) Ambient humidity: 0 ~ 95% rel. humidity
Condensing inside of sensor must be prevented!
For the detection of NO an EDL (electrodeless gas discharge lamp) is used. In the EDL, N2 and O2 are converted to NO and produce a selective UV radiation. With this radiation, a cross-sensitivity-free NO measurement is made possible. This method is called UV resonance absorption spectroscopy (UVRAS). A combination of both the UVRAS and NDUV technology allows the simultaneous gas analysis of NO, NO2 and SO2 in the lower ppm range which is particularly important in flue gas analysis (Continuous Emission Monitoring, CEM).Specifications UVRAS Sensor
General features
Measurement technology: UV resonance absorption spectroscopy (UVRAS) Detectable gases: Number of simultaneously detectable gases: max. 3 per sensor unit Measurement ranges: Flow rate range: 1 ltr/d ~ 300 ltr/h
For higher flow rates the sensor can be operated in bypassPressure loss (without additional optional sensors): 10 @ 100 / 35 @ 200 / 70 @ 300 (mbar @ ltr/h) Temperature compensation: Yes Data acquisition software: Yes Lifetime of UV radiation sources: LED > 20 000 h (NO2, SO2)
EDL > 8 000 h (NO)Measurement cuvette: Stainless steel with silicone coating inside Cuvette sealing: Viton O-ring Internal tubing: FKM / Viton (fluorinated rubber) Casing: High-quality table-top casing type 2, aluminium Dimensions (W x H x L): 464 x 189 x 305 mm Weight: approx. 6.5+ kg Gas connections: PVDF screw-type tube connection for tube Øi 4 mm, Øo 6 mm Measuring response
Linearity error: < ± 1% F.S. Repeatability: ± 0.5 % F.S. Long term stability zero N2: < 3 ppm / 24 h Long term stability span: < ± 1 % F.S. / month Temperature influence of zero point: < 1 % F.S. / 10 K Temperature influence of span: < 2 % F.S. / 10 K Cross sensitivity: 500 ppm NO2 < 2 ppm
100 ppm SO2 < 2 ppm
100 ppm N2O < 10 ppm
20 °C D.P. H2O < 10 ppm Pressure influence: < 1.5% / 10 hPa of reading Warm-up time: 1 min (initial), < 60 min for full specification Response time (t90): 1.5 ~ 15 sec Sampling frequency by software: ≤ 10 Hz Detection limit: Resolution: 0.5 x detection limit Electrical features
Power supply: 24 VDC incl. power plug 100 ~ 240 VAC
50/60 Hz: 24 VDC Supply current (peak): 1.5 A Inrush current: 0.2 ~ 0.7 A Power consumption: 36 W Interface: USB (standard), RS232 / CANbus / CANopen (options)
incl. data transmission cable 1 m Analogue voltage output (option): 0-2 V / 0-5 V / 0-10 V Climatic conditions
Operating temperature: +5 ~ +40 °C Storage temperature: –20 ~ +60 °C Operating pressure: 800 ~ 1200 hPa (mbar) Ambient humidity: 0 ~ 95% rel. humidity
Condensing inside of sensor must be prevented!
Table of Measurement Ranges
Table of Detection Limits (= 3 σ) in Percent of Full Scale
Recalibrations
The following recalibration intervals are recommended for UV sensors: