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Manual de funcionamiento – Sensores MultiGas

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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 Rango de medición
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 infrarrojo NDIR Módulo ultravioleta NDUV Módulo ultravioleta NDUV / UVRAS

* Calibración con 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.

Tenga en cuenta: 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 / Hojas de datos / 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
    Tenga en cuenta:  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. Si corresponde: conecte el puerto de salida de gas del sensor a otros componentes, como bolsas de muestreo de gas, tubos de escape, etc.
    • La conexión del tubo al puerto de salida de gas se realiza de la misma manera que se describe anteriormente.
  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

Descripción

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.

Aplicaciones

  • 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
Caja: 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.

Tabla de rangos de medición

Rangos de medición / Valor de escala completa (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 Rangos de medición a petición

Módulo infrarrojo NDIR Módulo ultravioleta NDUV Módulo ultravioleta NDUV / UVRAS

* Calibración con propano

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

Límites de detección / % del valor del fondo de 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 Rangos de medición a petición

Módulo infrarrojo NDIR Módulo ultravioleta NDUV Módulo ultravioleta NDUV / UVRAS

* Calibración con propano

Definición de límite de detección

El límite de detección es el valor de medición más pequeño que puede obtenerse con una incertidumbre específica. Esta incertidumbre incluye la resolución, el ruido y la estabilidad del sensor de gas para un gas específico y un rango de medición específico. Para evaluar el valor del límite de detección, se realizan varias mediciones individuales en las mismas condiciones de medición. Con los resultados de las mediciones individuales obtenidas se calcula la desviación estándar "Sigma" (σ). Los valores indicados en la tabla equivalen a la triple cantidad 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

Descripción

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.

Aplicaciones

  • 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
Caja:  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

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
Caja: 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
Caja:  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!

Tabla de rangos de medición

Rangos de medición / Valor de escala completa (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 infrarrojo NDIR Módulo ultravioleta NDUV Módulo ultravioleta NDUV / UVRAS

* Calibración con propano

(1) Full Scale (FS)

Other ranges on request

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

Límites de detección / % del valor del fondo de 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 infrarrojo NDIR Módulo ultravioleta NDUV Módulo ultravioleta NDUV / UVRAS

* Calibración con propano

Definición de límite de detección

El límite de detección es el valor de medición más pequeño que puede obtenerse con una incertidumbre específica. Esta incertidumbre incluye la resolución, el ruido y la estabilidad del sensor de gas para un gas específico y un rango de medición específico. Para evaluar el valor del límite de detección, se realizan varias mediciones individuales en las mismas condiciones de medición. Con los resultados de las mediciones individuales obtenidas se calcula la desviación estándar "Sigma" (σ). Los valores indicados en la tabla equivalen a la triple cantidad 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

Opciones (installed inside of the sensor casing)

8.1. Sensor de oxigeno

El sensor de oxígeno es un módulo de sensor disponible como opción además de un sensor RITTER MultiGas NDIR o NDUV. La concentración de oxígeno medida se muestra en el software proporcionado. Hay dos versiones disponibles:

a) Especificaciones para gases no agresivos

Tecnología de medición: Sensor electroquímico
Rangos de medición (Versión estándar): 0 – 25% or 0 – 100%
Precisión de la medición: ±2% de lapso (escala completa)
Resolución: < 0.5% de lapso (escala completa)
Tiempo de respuesta (t90): ≈ 15 s; versión para automóviles ≈ 5 s
Vida útil: aprox. 5 años
Hier steht mein Test

b) Especificaciones para H2S y gases ácidos similares

Tecnología de medición: Sensor electroquímico
Rangos de medición (H2S versión resistente): 0.5 – 35%
Precisión de la medición: ±2% de lapso (escala completa)
Resolución: < 0.5% de lapso (escala completa)
Tiempo de respuesta (t90): ≈ 15 s; versión para automóviles ≈ 5 s
Vida útil: aprox. 5 años

8.2. Sensor de presión

Un cambio en la presión del gas provoca un cambio en el número de moléculas por volumen y, por tanto, un cambio en la densidad del gas. Este cambio de densidad tiene a su vez una influencia significativa en el resultado de la medición de la concentración por el sensor. Mediante la medición de la presión del gas dentro de la célula de muestra (cubeta), se compensa / corrige el valor de la medición de la concentración.

El sensor de presión es un módulo de sensor disponible como opción además de un sensor RITTER MultiGas NDIR o NDUV. El valor de la presión medida se muestra en el software suministrado. Hay dos versiones disponibles:

a) Especificaciones para gases no agresivos

Rango de medición: 800 – 1,200 mbar abs.
Precisión de la medición: ±1% de lapso (escala completa)
Resolución: <1 mbar
Tiempo de respuesta (t90): 1 s
Incluye compensación de temperatura

b) Especificaciones para H2S y gases ácidos similares

Rango de medición: 0.2 – 3.5 bar abs.
Precisión de la medición: ±1% de lapso (escala completa)
Resolución: 2 mbar
Tiempo de respuesta (t90): 1 s
Incluye compensación de temperatura

8.3. Sensor de humedad

El sensor de humedad es un módulo de sensor disponible como opción además de un sensor RITTER MultiGas NDIR o NDUV. Los valores de humedad medidos (absolutos y relativos) se muestran en el software suministrado.

Especificaciones

Tecnología de medición: Sensor de humedad de polímero
Rango de medición: 0-100% rH
Precisión de la medición: ±2% rH de lapso (escala completa)
Resolución: ±1% RH
Tiempo de respuesta (t90): 12 s
Incluye compensación de temperatura
Valores indicados (en software): absoluto (% absH) y la humedad relativa (% rH)

8.4. Salida de tensión analógica

Para la conexión a un dispositivo de adquisición de datos analógicos, el puerto de salida de tensión analógica proporciona alternativamente los siguientes niveles de tensión:

  • 0–2V
  • 0–5V
  • 0–10V

El rango de tensión está preestablecido según el pedido y no puede ser modificado por el usuario.

El módulo de salida de tensión analógica permite la salida simultánea de hasta 4 valores diferentes en 4 canales separados:

  • 3 x señales de concentración de gas (excluyendo el sensor de oxígeno)
  • 1 x valor de humedad del sensor de humedad

Tenga en cuenta: Las asignaciones de las respectivas mediciones de concentración de gas a los respectivos canales. Estas asignaciones se indican en el Protocolo de Calibración de la unidad de sensor.

RITTER Analog Voltage Output

Asignación de contactos a los canales de las mediciones de concentración de gas en la toma y el enchufe de la salida de tensión analógica:

Vista a la toma de corriente
Vista para enchufar
Número de contacto Asignación al canal Colores del cable
1 canal 1 blanco
2 canal 2 verde
3 canal 3 amarillo
4 canal 4 gris
5 masa marrón

El cable de conexión se entrega con los hilos abiertos para ser conectado al dispositivo de adquisición de datos analógicos del usuario.

8.5. Calentamiento y termofijación de la carcasa del sensor

Para evitar la condensación de gas húmedo en el interior del sensor, la carcasa del sensor puede calentarse y termostatizarse. De forma estándar, el regulador de temperatura está preajustado a 50 °C; bajo petición, se pueden alcanzar temperaturas más bajas.

El elemento calefactor y el regulador de temperatura están montados en el soporte de la cubeta de medición.

Especificaciones

Controlador de temperatura 30-50°C
Precisión del control ± 0,2 K
Potencia calorífica 12 Watt / 30 Watt con elemento calefactor externo