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
General features
| Measurement technology: | Innovative NDUV Sensor (non-dispersive ultraviolet sensor) |
| Detectable gases: | |
| Number of simultaneously detectable gases: | max. 2 |
| Measurement ranges: | See Table of Measurement Ranges |
| Flow rate range: | 5 ~ 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: | < ± 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: | See Table of Detection Limits |
| 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! |
List of standard measurement ranges *1 ( and detection limits *2 )
| Standard Measuring Ranges with respective Detection Limits ( % of F.S. *3 ) | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
1 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%) |
|||||||
| SO2 | (< 0.1%) |
(< 0.1%) |
(< 0.1%) |
(< 0.1%) |
(< 0.1%) |
(< 0.1%) |
(< 0.1%) |
(< 0.1%) |
(< 0.5%) |
(< 0.5%) |
(< 0.5%) |
|||||
| H2S | (< 0.1%) |
(< 0.1%) |
(< 0.1%) |
(< 0.1%) |
(< 0.2%) |
(< 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%) |
|||||||||||
Infrared module NDIR Ultraviolet module NDUV
Definition of Detection Limit
The Detection Limit is the smallest measurement value which can be obtained with a specific uncertainty. This uncertainty includes the resolution, noise and stability of the gas sensor for a specific gas and specific measurement range. For evaluation of the detection limit value, several single measurements are taken at the identical measurement conditions. With the obtained single measurement results the standard deviation “Sigma” (σ) is calculated. The values given in the table equal the triple amount of Sigma.
Recalibrations
The following recalibration intervals are recommended for UV sensors:
V 1.0 / Rev. 2023-05-10 / Subject to alterations.
The most recent version of this data-sheet can be found at …
https://www.ritter.de/en/multigas-nduv-ultraviolet-modules/
Dr.-Ing. RITTER Apparatebau GmbH & Co. KG · Coloniastrasse 19-23 · D-44892 Bochum · Germany
For questions please contact mailbox@ritter.de or your local distribution partner (on our overview page)
https://www.ritter.de/en/multigas-nduv-ultraviolet-modules/
Dr.-Ing. RITTER Apparatebau GmbH & Co. KG · Coloniastrasse 19-23 · D-44892 Bochum · Germany
For questions please contact mailbox@ritter.de or your local distribution partner (on our overview page)