Beschreibung
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.
Anwendungen
Specifications NDUV Sensor
General features
Messverfahren:
Innovative NDUV Sensor
(nicht-dispersiver UV-Sensor)
Detectable gases:
Number of simultaneously detectable gases:
max. 2
Measurement ranges:
See below
Volumenstrom-Bereich:
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
Datenerfassungs-Software:
Yes
Lifetime of UV radiation source:
> 8 000 h
Measurement cuvette:
Stainless steel with silicone coating inside
Cuvette sealing:
Viton O-ring
Gehäuse:
High-quality table-top casing, aluminium
Dimensions (W x H x L):
464 x 189 x 305 mm
Gewicht:
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
Aufwärmzeit:
1 min (initial), <60 min for full specification
Ansprechzeit (t90):
1.5 – 15 sec
Sampling frequency by software:
≤ 10 Hz
Detection limit:
See below
Resolution:
0.5 x detection limit
Electrical features
Spannungversorgung:
24 VDC inkl. Steckernetzteil 100 ~ 240 VAC / 24 VDC
Supply current (peak)
<0.4 A
Average power consumption
< 7.5 W
Schnittstelle:
USB (standard), RS232 (option) – incl. data transmission cable 1 m
Analogue voltage output (option):
0-2V / 0-5V / 0-10V
Climatic conditions
Max. Betriebstemperatur:
+25 ~ +45 °C
Storage temperature:
–20 ~ +60 °C
Betriebsdruck:
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
Messverfahren: Innovative NDUV Sensor
(nicht-dispersiver UV-Sensor) Dual beamDetectable gases:
Number of simultaneously detectable gases: max. 2 Measurement ranges: See below Volumenstrom-Bereich: 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 Datenerfassungs-Software: Yes Lifetime of UV radiation source: > 8 000 h Measurement cuvette: Stainless steel with silicone coating inside Cuvette sealing: Viton O-ring Gehäuse: High-quality table-top casing, aluminium Dimensions (W x H x L): 464 x 189 x 305 mm Gewicht: 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 Aufwärmzeit: 1 min (initial), < 15 min for full specification Ansprechzeit (t90): 1.5 – 15 sec Sampling frequency by software: ≤ 10 Hz Detection limit: See below Resolution: 0.5 x detection limit Electrical features
Spannungversorgung: 24 VDC inkl. Steckernetzteil 100 ~ 240 VAC / 24 VDC Supply current (peak): <0.4 A Average power consumption: < 7.5 W Schnittstelle: USB (standard), RS232 (option) – incl. data transmission cable 1 m Analogue voltage output (option): 0-2V / 0-5V / 0-10V Climatic conditions
Max. Betriebstemperatur: +5 ~ +45 °C Storage temperature: –20 ~ +60 °C Betriebsdruck: 800 ~ 1200 hPa (mbar) Ambient humidity: 0 ~ 95% rel. humidity // Condensing inside of sensor must be prevented!
Für den Nachweis von NO wird eine elektrodenlose Gasentladungslampe (EDL) eingesetzt. In der EDL wird N2 und O2 zu NO umgewandelt und erzeugt selektive UV-Strahlung. Mit dieser Strahlung wird eine querempfindlichkeitsfreie NO-Messung ermöglicht. Dieses Verfahren wird als UV-Resonanzspektroskopie (UVRAS) bezeichnet. 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
Messverfahren: Innovative NDIR Sensor (non-dispersive infrared sensor) Detectable gases:
Number of simultaneously detectable gases: max. 3 per sensor unit Measurement ranges: See below Volumenstrom-Bereich: 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 Datenerfassungs-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 Gehäuse: High-quality table-top casing, aluminium Dimensions (W x H x L): 171 x 86 x 290 mm Gewicht: 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
Aufwärmzeit:
1 min (initial), < 60 min for full specification
Ansprechzeit (t90):
1.5 ~ 15 sec
Sampling frequency by software:
≤ 10 Hz
Detection limit:
See below
Resolution:
0.5 x detection limit
Electrical features
Spannungversorgung:
24 VDC inkl. Steckernetzteil 100 ~ 240 VAC / 24 VDC
Supply current (peak):
1.5 A
Inrush current:
0.2 ~ 0.7 A
Power consumption:
36 W
Schnittstelle:
USB (standard), RS232 (option) – incl. data transmission cable 1 m
Analogue voltage output (option):
0-2V / 0-5V / 0-10V
Climatic conditions
Max. Betriebstemperatur:
+5 ~ +40 °C
Storage temperature:
–20 ~ +60 °C
Betriebsdruck:
800 ~ 1200 hPa (mbar)
Ambient humidity:
0 ~ 95% rel. humidity // Condensing inside of sensor must be prevented!
Tabelle der Messbereiche
Messbereiche / Messbereichs-Endwert (F.S.)
100 Vol.%
50 Vol.%
30 Vol.%
20 Vol.%
10 Vol.%
5 Vol.%
1 Vol.%
5.000 ppm
2.000 ppm
1.000 ppm
500 ppm
300 ppm
100 ppm
50 ppm
10 ppm
O3
CL2
H2S
SO2
NO2
NO
Infrarot-Modul NDIR Ultraviolett-Modul NDUV Ultraviolett-Modul NDUV / UVRAS
* Kalibrierung mit Propan
(1) Full Scale (FS)
Other ranges on request
Table of Detection Limits (= 3 σ) in Percent of Full Scale
Nachweisgrenzen / % vom Messbereichs-Endwert (F.S.)
100 Vol.%
50 Vol.%
30 Vol.%
20 Vol.%
10 Vol.%
5 Vol.%
1 Vol.%
5.000 ppm
2.000 ppm
1.000 ppm
500 ppm
300 ppm
100 ppm
50 ppm
10 ppm
O3
< 0,1%
< 0,1%
< 0,1%
< 0,2%
< 0,5%
< 0,5%
< 0,5%
CL2
< 0,1%
< 0,1%
< 0,1%
< 0,1%
< 0,1%
< 0,1%
< 0,1%
< 0,2%
< 0,5%
H2S
< 0,1%
< 0,1%
< 0,1%
< 0,1%
< 0,2%
< 0,5%
SO2
< 0,1%
< 0,1%
< 0,1%
< 0,1%
< 0,1%
< 0,1%
< 0,1%
< 0,1%
< 0,5%
< 0,5%
< 0,5%
NO2
< 0,1%
< 0,1%
< 0,1%
< 0,2%
< 0,2%
< 0,5%
< 0,5%
< 0,5%
NO
< 0,1%
< 0,1%
< 0,1%
< 0,2%
< 0,2%
Infrarot-Modul NDIR Ultraviolett-Modul NDUV Ultraviolett-Modul NDUV / UVRAS
* Kalibrierung mit Propan
Definition der Nachweisgrenze
Die Nachweisgrenze ist der kleinste Messwert, der mit einer bestimmten Unsicherheit ermittelt werden kann. Diese Unsicherheit beinhaltet die Auflösung, das Rauschen und die Stabilität des Gassensors für ein bestimmtes Gas und einen bestimmten Messbereich. Zur Ermittlung der Nachweisgrenze werden mehrere Einzelmessungen unter identischen Messbedingungen durchgeführt. Mit den erhaltenen Werten der Einzelmessungen wird die Standardabweichung "Sigma" (σ) berechnet. Die in der Tabelle angegebenen Werte entsprechen dem dreifachen Betrag von Sigma.
1) Zero to Full Scale (FS)
Recalibrations
The following recalibration intervals are recommended for UV sensors: