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Manual de Operação – Sensores MultiGas

Tabela de Conteúdos

General Specifications

1.1. Casing Types

1.2. Dimensions

Casing Type 1 Casing Type 2
A 171 mm 444 mm
B 290 mm (1) 305 mm
C 86 mm 145 mm
Weight, approx. (2) 2+ kg 6.5 – 8 kg
Connections gas in-/outlet PVDF screw-type tube connection for tube Ø 4i / 6o mm PVDF screw-type tube connection for tube Ø 4i / 6o mm
Interfaces USB ( Standard) / RS232 ( Option) USB ( Standard) / RS232 ( Option)
Power 24 V DC 24 V DC
(1) May be larger with cuvettes for ppm measurement ranges
(2)  Depending on type and number of built-in sensor modules

1.3. Assignment of Sensor Types to possible Sensor Combinations

  1. Part 1 – Pre‐configured sensors, incl. casing type 1 with gas connection fittings, data interface, plug‐in power supply – ready for use
  2. Part 2 – Pre‐configured sensors, incl. casing type 2 with gas connection glands, data interface, fittings, data interface, plug‐in power supply ‐ ready for use
  3. Part 3 – Individually combinable sensor modules, composition according to customer specification, delivery incl. housing in suitable size according to number and type of modules – ready for use
  4. Part 4 – Casings for sensor modules, assembled according to customer’s specification
  5. Part 5 – Built‐in options mounted inside of the casing
  6. Part 6 – Accessories / options

Part 1: Pre‐configured Sensors
Incl. casing type 1 with gas connection fittings, data port, power supply Ready for use

Sensor Type: 
RITTER MultiGas xxx
Article
No.
Group of Gases
IR
Number of Detectable Gases
in this Group
Group of Gases
UV
Number of Detectable Gases
in this Group
xxx = mono IR1 2678
CO2 CO N2O CH4 CnHm* CF4 SF6 H2O
1
xxx = duo IR2 2742
CO2 CO N2O CH4 CnHm* CF4 SF6 H2O
2
xxx = trio IR3 2743
CO2 CO N2O CH4 CnHm* CF4 SF6 H2O
3
xxx = mono UV1 2749
O3 Cl2 ≤ 5% SO2 NO2
1
xxx = mono UV1 Cl2 30% 2763
Cl2 ≤ 30%
1
xxx = duo UV2 2766
O3 Cl2 ≤ 5% SO2 NO2
2
xxx = duo IR1 +  UV1 2797
CO2 CO N2O CH4 CnHm* CF4 SF6 H2O
1
O3 Cl2 ≤ 5% SO2 NO2
1
xxx = trio IR1 +  UV2 na
CO2 CO N2O CH4 CnHm* CF4 SF6 H2O
1
O3 Cl2 ≤ 5% SO2 NO2
2
* Calibration with Propane

Part 2: Pre‐configured Sensors
Incl. casing type 2 with gas connection fittings, data port, power supply Ready for use

Sensor Type: 
RITTER MultiGas xxx
Article
No.
Group of Gases
IR
Number of Detectable Gases
in this Group
Group of Gases
UV
Number of Detectable Gases
in this Group
xxx = mono UV1 H2S ≤ 5.000 ppm 2672
H2S ≤ 5.000ppm
1
xxx = mono UV1 H2S ≤ 1% 2855
H2S ≤ 1%
1
xxx = UVRAS 2812
SO2 NO2 NO
1
xxx = duo IR1 + H2S ≤ 5000 ppm 2959
CO2 CO N2O CH4 CnHm* CF4 SF6 H2O
1
H2S
1
xxx = duo IR1 + (H2S ≤1% / NO) 2960
CO2 CO N2O CH4 CnHm* CF4 SF6 H2O
1
H2S ≤ 1% NO
1
* Calibration with Propane

Part 3: Individually combinable sensor modules
Composition according Customer Specification
Delivery incl. casing of suitable size according to number and type of modules Ready for use

Sensor Type: 
RITTER MultiGas xxx
Article
No.
Group of Gases
IR
Number of Detectable Gases
in this Group
Group of Gases
UV
Number of Detectable Gases
in this Group
xxx = Mod IR1 2813
CO2 CO N2O CH4 CnHm* CF4 SF6 H2O
1
xxx = Mod IR2 2814
CO2 CO N2O CH4 CnHm* CF4 SF6 H2O
2
xxx = Mod IR3 2815
CO2 CO N2O CH4 CnHm* CF4 SF6 H2O
3
xxx = Mod UV1 2830
O3 Cl2 ≤ 5% SO2 NO2
1
xxx = Mod UV1 Cl2 30% na
Cl2 ≤ 30%
1
xxx = Mod UV1 H2S ≤ 5.000 ppm 2841
H2S
1
xxx = Mod UV1 H2S ≤ 1% 2856
H2S
1
xxx = Mod UV2 2831
O3 Cl2 ≤ 5% SO2 NO2
2
xxx = Mod UVRAS 2917
SO2 NO2 NO
3
* Calibration with Propane

Part 4: Casings for Sensor Modules assembled according to Customer Specification

Casing Type: 
RITTER MultiGas xxx
Article
No.
Casing Type Suitable for
xxx =  Cas-2 (1) 2817 Casing type 2 … multiple modules up to 444 x 145 x 305 mm
xxx =  Cas-3 (1) 2818 Casing type 3 … multiple modules up to 464 x 189 x 305 mm
(1) Casing type depends on the type and number of built-in sensor modules

Part 5 Built‐in Options

Option Type: 
RITTER MultiGas xxx
Article
No.
Name Faixa de medição
xxx = O2 (2) (3) 2767 Oxgen Sensor 0 – 100%
xxx = O2-resist (3) 2824 Oxygen Sensor, H2S resistant 0.5 – 35%
xxx = P (2) (3) 2771 Pressure Sensor 800 – 1200 mbar abs.[/wpml-string] / Resolution <1 mbar
xxx = P-resist (3) 2825 Pressure Sensor, H2S resistant 0.2 – 3.5 bar abs. / Resolution 2 mbar
xxx = H (2) (3) 2773 Humidity Sensor 0 – 100% RH
xxx = A/O 2648 Analog Voltage Output 0-2V / 0-5V / 0-10V 4 Analog output ports for 4 separate gas concentrations, 16 bit
xxx = Therm-Cas 2954 Thermostated Casing Heating and thermostatting of the sensor casing at 50°C 
(1) Casing type depends on the type and number of built-in sensor modules
(2) Not suitable for SO2, Cl2, H2S
(3) Available as supplement to IR or UV sensor only

Part 6: Accessories / Options

Option Type: 
RITTER MultiGas xxx
Article
No.
Name Range
xxx = Cal-ZP-N2 2805 Calibration Gas N2  For zero-point calibration of all gases
xxx = Flow-V 2806 Mini Flow Valve Control of flow rate, incl. Manometer for calibration gas bottle
xxx = Cal-CG-Cat1 2948 Calibration with special carrier gas (Ar, H2, He) for gases category 1 Category 1 gases:
CO2 CO < 0Vol-% N2O CH4 CnHm* CF4 SF6 O3 CL2 SO2 < 10Vol-% NO2 NO
xxx = Cal-CG-Cat2 2949 Calibration with special carrier gas (Ar, H2, He) for gases category 2 Category 2 gases:
CO > 10Vol-% H2S SO2 > 10Vol-%
xxx = Cal-ReCal-Cat1 2950 Calibration for gases category 1 Category 1 gases:
CO2 CO < 0Vol-% N2O CH4 CnHm* CF4 SF6 O3 CL2 SO2 < 10Vol-% NO2 NO
xxx = Cal-ReCal-Cat2 2951 Calibration for gases category 2 Category 2 gases:
CO > 10Vol-% H2S SO2 > 10Vol-%

Módulo infravermelho NDIR Módulo ultravioleta NDUV Módulo ultravioleta NDUV / UVRAS

* Calibração com Propano

Disadvantages of electrochemical (EC) sensors in comparison to the optical gas sensors RITTER »MultiGas«

  • EC sensors become “blind” over time and then display a constant value, usually zero. This suggests misleadingly a stable zero point.
  • EC sensors must therefore be replaced preventatively every 0.5 – 2 years, after replacement the sensor must be recalibrated, as the tolerances of EC sensors are relatively high. This causes supplementary additional costs.
  • With EC sensors, mutual influence and deterioration occur by different gases, e.g. NO2 damages the SO2 sensor and vice versa.
  • In many countries (e.g. in China) EC sensors are forbidden by law with governmental inspection and approval measurements, because they show too low values if they are contaminated or aged. The user then receives “false positive” values.
  • The lifetime of the EC cells is already reduced during storage; therefore, the storage should only be a few weeks.
  • The response time (t90) is relatively long compared to the optical measuring methods – mostly about 30 sec. Optical systems are in the range < 5 sec.
  • Due to the measuring principle of the EC sensors there is always a chemical reaction between the test gas and the sensor. By this reaction, small quantities of the test gas components are converted. For example, CO is converted into CO2. With low quantities of test gas, measurements beyond the gas sensor can therefore be influenced because fewer CO molecules are present in the gas sample.

Preventive / Protective Measures regarding the Gas to be measured

a) Additional tube connection for flushing of the casing

The gas lines inside the casing and the measuring cuvette are gas-tight by means of O-rings and other gas-tight connections. However, as with all connections, a leakage rate, however slight, cannot be ruled out. With an additional tube connection for flushing of the casing, an accumulation of the measuring gas inside the casing can be prevented.

In the case of toxic or aggressive gases, a suction line can be connected via this tube connection, which creates a under-pressure inside the housing thus preventing the gas from escaping from the casing.

In case of ignitable gases (methane, hydrogen, etc.), a pressure or suction line can be connected via this tube connection creating an over- or under-pressure inside the casing thus preventing the accumulation of an ignitable gas mixture.

Por favor, note que: H2S can be perceived as an unpleasant smell even in the ppb range. Even with an O-ring seal, micro-leaks can occur, which can be extracted by flushing the housing.

b)  Heated and thermostatted casing

A condensation of the measuring gas inside of the sensor must be prevented. This is done in general for example by a condensation trap or gas cooler.Alternatively, the inside of the sensor casing can be heated and thermostatted at 50°C (standard). The heating not only avoids condensation inside of the sensor but ensures constant measurement results as well.

c)  Particle filter

Please make sure by use of a suitable filter that no particles are carried into the sensor. These might block the small orifices of the internal fittings. It is recommended to use filters of 5 micron or smaller.

Scope of Supply

No. of Items Item
1 Document folder including : Calibration Certificate / Folhas de dados / Software Manual
1 Sensor in table top casing
1 Power adapter
1 Data acquisition software (on USB memory card) 1 USB connection cable (sensor computer )
3m Viton tubing Øi 4mm/Øo 6mm

Setup

  1. Unpack all items carefully
  2. Install the data acquisition software according to the “RITTER MultiGas Software Manual”.
    Don’t start the software at this point in time.
  3. Place the sensor next to the gas source
    Por favor note:  A tube connection between gas source and sensors that is as short as possible allows a small dead space created by the tubing. In turn, a small dead space enables a fast response time of the sensor.
  4. Connect the power adapter to socket “DC 24 V” at the rear side of the sensor and to mains.
  5. Connect the data acquisition cable to the respective socket at the rear side of the sensor and to the computer:
    1. USB cable to the socket “USB”
    2. RS232 cable to the socket “RS 232” (option )
  6. Connect the gas source to the gas inlet port of the sensor by using the provided tubing as follows:
    1. Unscrew the screw cap from the gas inlet port.
    2. Slide the screw cap onto the end of the tube with the thread of the screw cap facing the tube end.
    3. Push the tube onto the cone in the center of the gas inlet port.
    4. Slide the screw cap to the gas inlet port and screw it hand-tightly in place.
  7. Se aplicável: Conecte a porta de saída de gás do sensor a outros componentes, como bolsas de amostragem de gás, tubulação de exaustão, etc.
    • A conexão do tubo à porta de saída de gás ocorre da mesma forma descrita acima.
  8. Switch-on the power switch at the front side of the sensor casing.
  9. Start the software and open the COM port(s) of the connected sensor module(s) according to the software manual.

The RITTER »MultiGas« Sensor is now ready for use.

Infrared Sensors

Descrição

Gas analysis based on the NDIR technique is an established method to determine the concentrations of gases in complex mixtures. The RITTER »MultiGas« sensors use new optical components for optimal analysis results: Up to 3 optical filters analyse the gas which flows through the sensor as one gas stream. The optional oxygen, pressure, and humidity sensors are in-line with the same single gas stream.

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 other 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 ≈ 3 seconds.

The entire unit can be disassembled for easy maintenance/service.

Aplicativos

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

Specifications

RITTER MultiGas infrared sensor

General features

Measurement technology: Innovative NDIR Sensor (non-dispersive infrared sensor)
Detectable gases:
CO2 CO N2O CH4 CnHm* CF4 SF6 H2O
Number of simultaneously detectable gases: max. 3 per sensor unit
Measurement ranges: See below
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 IR radiation source: > 40 000 h
Measurement cuvette: Aluminium, with measurement ranges ≤1% gold-plated inside
Cuvette sealing: Viton O-ring
Caixa: High-quality table-top casing, aluminium
Dimensions (W x H x L): 171 x 86 x 290 mm
Peso: 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: < ± 2% F.S. / week
Long term stability span: < ± 2% 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: 2 min
Response time (t90): ≈ 3 sec
Sampling frequency by software: ≤ 10 Hz
Detection limit: See below
Resolution: 0.5 x detection limit
Water vapour: No influence with measurements of CO2 and CH4

Electrical features

Power supply: 24 VDC incl. power plug 100 ~ 240 VAC / 24 VDC
Average power consumption: < 1W
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: +15 ~ +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!

Analysis of CnHm*

The calibration of sensors for CnHm will be performed with propane. Aromatic hydrocarbons are also measured but with a different weighting. This means that the sensitivity of the sensor is significantly smaller with these gases than with other hydrocarbons.

Tabela de intervalos de medição

Faixas de medição / Valor total da escala (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
CO2
CO
N2O
CH4
CnHm*
CF4
SF6
H2O Gamas de medição a pedido

Módulo infravermelho NDIR Módulo ultravioleta NDUV Módulo ultravioleta NDUV / UVRAS

* Calibração com Propano

Table of Detection Limits (= 3 σ) in Percent of Full Scale

Limites de detecção / % do valor total da escala (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
CO2 < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.3% < 0.3%
CO < 0.2% < 0.2% < 0.2% < 0.2% < 0.2% < 0.2% < 0.2% < 0.3% < 0.5% < 0.5%
N2O < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.3%
CH4 < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.1% < 0.3% < 0.5%
CnHm* < 0.1% < 0.1% < 0.1% < 0.2% < 0.2% < 0.2% < 0.2% < 0.5% < 0.5%
CF4 < 0.2% < 0.2% < 0.2%
SF6 < 0.1% < 0.1% < 0.1% < 0.2% < 0.5% < 0.3% < 0.3%
H2O Gamas de medição a pedido

Módulo infravermelho NDIR Módulo ultravioleta NDUV Módulo ultravioleta NDUV / UVRAS

* Calibração com Propano

Definição de Limite de Detecção

O Limite de Detecção é o valor de medição mais pequeno que pode ser obtido com uma incerteza específica. Esta incerteza inclui a resolução, o ruído e a estabilidade do sensor de gás para um gás específico e uma gama de medição específica. Para a avaliação do valor limite de detecção, são efectuadas várias medições individuais nas mesmas condições de medição. Com os resultados de medição única obtidos, é calculado o desvio padrão "Sigma" (σ). Os valores indicados na tabela são iguais à quantidade tripla de Sigma.

Recalibrations

The following recalibration intervals are recommended for IR sensors:

  • Zero-point: Weekly with inert gas, 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

Ultraviolet Sensors

Descrição

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.

Aplicativos

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

Specifications NDUV Sensor

RITTER MultiGas ultraviolet sensor

General features

Measurement technology: Innovative NDUV Sensor
(non-dispersive ultraviolet sensor)
Detectable gases:
O3 CL2 H2S SO2 NO2
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
Caixa:  High-quality table-top casing, aluminium
Dimensions (W x H x L):  464 x 189 x 305 mm
Peso:  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[/wpml-string]
Warm-up time:  1 min (initial), <60 min for full specification
Response time (t90): 1.5 – 15 sec[/wpml-string]
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[/wpml-string] 100 ~ 240 VAC / 24 VDC
Supply current (peak[/wpml-string]) <0.4 A
Average power consumption < 7.5 W
Interface: USB (standard), RS232 (option) – incl. data transmission cable 1 m
Analogue voltage output (option[/wpml-string]):  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!

Specifications H2S Sensor

image001

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:
H2S SO2
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
Caixa: High-quality table-top casing, aluminium
Dimensions (W x H x L): 464 x 189 x 305 mm
Peso:  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!

Specifications UVRAS Sensor

RITTER MultiGas-Modul UVRAS

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:  Innovative NDIR Sensor (non-dispersive infrared sensor)
Detectable gases: 
SO2 NO2 NO
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
Caixa:  High-quality table-top casing, aluminium
Dimensions (W x H x L):  171 x 86 x 290 mm
Peso:  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:
  • 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:  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[/wpml-string]):  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!

Tabela de intervalos de medição

Faixas de medição / Valor total da escala (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

Módulo infravermelho NDIR Módulo ultravioleta NDUV Módulo ultravioleta NDUV / UVRAS

* Calibração com Propano

(1) Full Scale (FS)

Other ranges on request

Table of Detection Limits (= 3 σ) in Percent of Full Scale

Limites de detecção / % do valor total da escala (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%

Módulo infravermelho NDIR Módulo ultravioleta NDUV Módulo ultravioleta NDUV / UVRAS

* Calibração com Propano

Definição de Limite de Detecção

O Limite de Detecção é o valor de medição mais pequeno que pode ser obtido com uma incerteza específica. Esta incerteza inclui a resolução, o ruído e a estabilidade do sensor de gás para um gás específico e uma gama de medição específica. Para a avaliação do valor limite de detecção, são efectuadas várias medições individuais nas mesmas condições de medição. Com os resultados de medição única obtidos, é calculado o desvio padrão "Sigma" (σ). Os valores indicados na tabela são iguais à quantidade tripla de Sigma.

1) Zero to Full Scale (FS)

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
  • End-point (full scale): Every 3 months with suitable calibration gas

Opções (installed inside of the sensor casing)

8.1. Sensor de oxigênio

O sensor de oxigênio é um módulo de sensor disponível como opção, além de um sensor NDIR ou NDUV MultiGas RITTER. A concentração de oxigênio medida é exibida no software fornecido. Há duas versões disponíveis:

HXXO20190220180334 1200

a) Especificações para gases não agressivos

Tecnologia de medição: Sensor eletroquímico
Faixas de medição (Versão padrão): 0 – 25% or 0 – 100%
Precisão da medição: ±2% de extensão (escala completa)
Resolução: < 0.5% de extensão (escala completa)
Tempo de resposta (t90): ≈ 15 s; versão automóvel ≈ 5 s
Tempo de vida: aprox. 5 anos
Hier steht mein Test

b) Especificações para H2S e gases ácidos similares

Tecnologia de medição: Sensor eletroquímico
Faixas de medição (H2S versão resistente): 0.5 – 35%
Precisão da medição: ±2% de extensão (escala completa)
Resolução: < 0.5% de extensão (escala completa)
Tempo de resposta (t90): ≈ 15 s; versão automóvel ≈ 5 s
Tempo de vida: aprox. 5 anos

8.2. Sensor de pressão

Uma alteração na pressão do gás provoca uma alteração no número de moléculas por volume e, portanto, uma alteração na densidade do gás. Esta alteração da densidade, por sua vez, tem uma influência significativa sobre o resultado da medição da concentração pelo sensor. Ao medir a pressão de gás dentro da célula da amostra (cubeta), o valor da medição da concentração é compensado / corrigido.

O sensor de pressão é um módulo sensor disponível como opção para além de um sensor RITTER MultiGas NDIR ou NDUV. O valor da pressão medida é apresentado no software fornecido. Há duas versões disponíveis:

HXXO20190221190133 xpsens lighter 2000

a) Especificações para gases não agressivos

Faixa de medição: 800 – 1,200 mbar abs.
Precisão da medição: ±1% de extensão (escala completa)
Resolução: <1 mbar
Tempo de resposta (t90): 1 s
Incl. compensação de temperatura

b) Especificações para H2S e gases ácidos similares

Faixa de medição: 0.2 – 3.5 bar abs.
Precisão da medição: ±1% de extensão (escala completa)
Resolução: 2 mbar
Tempo de resposta (t90): 1 s
Incl. compensação de temperatura

8.3. Sensor de Humidade

O sensor de humidade é um módulo sensor disponível como opção para além de um sensor RITTER MultiGas NDIR ou NDUV. Os valores da humidade medida (absoluta e relativa) são exibidos no software fornecido.

Especificações

Tecnologia de medição: Sensor de humidade polimérica
Faixa de medição: 0-100% rH
Precisão da medição: ±2% rH de extensão (escala completa)
Resolução: ±1% RH
Tempo de resposta (t90): 12 s
Incl. compensação de temperatura
Valores indicados (em software): absoluto (% absH) e humidade relativa (% rH)
HXXO20190220180649 1200

8.4. Tensão analógica de saída

Para ligação a um dispositivo analógico de aquisição de dados, a porta analógica de saída de tensão fornece alternativamente os seguintes níveis de tensão:

  • 0–2V
  • 0–5V
  • 0–10V

A gama de voltagem é predefinida de acordo com a ordem e não pode ser alterada pelo utilizador.

O Módulo de Saída de Tensão Analógica permite a saída simultânea de até 4 valores diferentes em 4 canais separados:

  • 3 x sinais de concentração de gás (excluindo sensor de oxigénio)
  • 1 x valor de humidade do sensor de humidade

Por favor note: As atribuições das respectivas medições de concentração de gás para os respectivos canais. Estas atribuições são indicadas no Protocolo de Calibração da unidade sensora.

RITTER Analog Voltage Output

Atribuição de contactos aos canais das medições de concentração de gás na tomada e no conector da Saída de Tensão Analógica:

image003
Vista para a tomada
image002
Vista para ligar
Nº de contato Atribuição ao canal Cores do Cabo de Fio
1 canal 1 branco
2 canal 2 verde
3 canal 3 amarelo
4 canal 4 cinzento
5 massa castanho

O cabo de ligação é entregue com fios abertos para ser ligado ao dispositivo analógico de aquisição de dados do utilizador.

8.5. Aquecimento e Termostato da caixa do sensor

Para evitar a condensação de gás húmido no interior do sensor, a caixa do sensor pode ser aquecida e termostato. Como padrão, o controlador de temperatura é pré-definido para 50°C; temperaturas mais baixas são possíveis a pedido.

O elemento de aquecimento e o controlador de temperatura são montados no suporte da cubeta de medição.

HXXO20190220183333 1600

Especificações

Controlador de temperatura 30-50°C
Precisão do controlo ± 0,2 K
Poder de aquecimento 12 Watt / 30 Watt com elemento de aquecimento externo