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 analyses 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: See below 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 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 4mm, Øo 6 mm Measuring response
Linearity error: < ± 1% F.S. Repeatability: ± 0.5% F.S. Long term stability zero N2: < ± 1% F.S. / 24h 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% / 10hPa 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: See below Resolution: 0.5 x detection limit Electrical features
Power supply: 24 VDC incl. power plug 100 ~ 240 VAC / 24 VDC Supply current (peak) <0.4 A Average power consumption < 7.5 W Interface: USB (standard), RS232 (option) – incl. data transmission cable 1 m Analogue voltage output (option): 0-2V / 0-5V / 0-10V 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: See below Flow rate range: 6 ~ 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 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 4mm, Øo 6 mm Measuring response
Linearity error: < ± 1% F.S. Repeatability: ± 0.5% F.S. Long term stability zero N2: < ± 1% F.S. / 24h 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% / 10hPa 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: See below Resolution: 0.5 x detection limit Electrical features
Power supply: 24 VDC incl. power plug 100 ~ 240 VAC / 24 VDC Supply current (peak): <0.4 A Average power consumption: < 7.5 W Interface: USB (standard), RS232 (option) – incl. data transmission cable 1 m Analogue voltage output (option): 0-2V / 0-5V / 0-10V 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: Innovative NDIR Sensor (non-dispersive infrared sensor) Detectable gases: Number of simultaneously detectable gases: max. 3 per sensor unit Measurement ranges: See below 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 IR radiation source: > 40 000 h Measurement cuvette: Aluminium, with measurement ranges ≤1% gold-plated inside Cuvette sealing: Viton O-ring Casing: High-quality table-top casing, aluminium Dimensions (W x H x L): 171 x 86 x 290 mm Weight: approx. 2 kg Gas connections: PVDF screw-type tube connection for tube Øi 4mm, Øo 6 mm Measuring response
Linearity error: < ± 1% F.S. Repeatability: ± 0.5 % F.S. Long term stability zero N2: < 3 ppm / 24h 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: 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: See below Resolution: 0.5 x detection limit Electrical features
Power supply: 24 VDC incl. power plug 100 ~ 240 VAC / 24 VDC Supply current (peak): 1.5 A Inrush current: 0.2 ~ 0.7 A Power consumption: 36 W Interface: USB (standard), RS232 (option) – incl. data transmission cable 1 m Analogue voltage output (option): 0-2V / 0-5V / 0-10V 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
(1) Full Scale (FS)
Other ranges on request
Table of Detection Limits (= 3 σ) in Percent of Full Scale
1) Zero to Full Scale (FS)
Recalibrations
The following recalibration intervals are recommended for UV sensors: