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Módulos ultravioleta MultiGas NDUV

RITTER · Made in Germany Folha de dados
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

  • Biogas analysis
  • Natural gas analysis
  • Environmental and Process Measurement
  • TOC analysers
  • Continuous Emission Monitoring (CEM)
  • Elemental analysis
  • Industrial gas analysis

Specifications NDUV Sensor

HXXO20220804153226 2560

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!

Specifications H2S Sensor

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.

General features

Measurement technology:Innovative NDUV Sensor
(non-dispersive ultraviolet sensor)
Dual beam
Detectable 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 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):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 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: +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!

Specifications UVRAS Sensor

HXXO20220804153654 2560

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).

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 bypass
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 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:

  • Zero-point:
    • Concentrations < 300 ppm: Every 48 hours with inertgas, e.g. Nitrogen
    • Concentrations ≥ 300 ppm: Every 24 hours with inertgas, e.g. Nitrogen
      The recalibration of the zero point is described in the software manual.
  • End-point (full scale): Every 3 months with suitable calibration gas