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gasQSTM static

The gasQS static precisely determines the thermal conductivity with the aid of a microthermal sensor. For binary gas mixtures (e.g. biogas) it can derive the percentage of the gases as well as calculate various gas properties such as calorific value and density with high accuracy. The two-wire connection allows easy integration into the control system without further knowledge of the bus systems. The simple screw-in connection requires only minimal intervention in the pipe system and does not require an exhaust pipe.

gasQS static sensitivity

High sensitivity

gasQS static measurement

Fast measurement

gasQS static commissioning

Easy commissioning

gasQS static moving parts

No moving parts

gasQS static pressure range

Wide pressure range

Prices and purchase orders

We would be happy to provide you with your personal offer in case of an inquiry.

Calibration check

gasQS™ static does not have specified due dates for calibration. Mems AG designed the device from the very beginning in such a way that reliable long-term behavior of the sensor is warranted. Our recommendation

Standard versions

For the specifications, please select the appropriate standard version below. If the characteristics do not fit your application, please contact us.

gasQSTM static – binary gas mixtures

A binary gas mixture (BG) is a mixture of two components such as methane and carbon dioxide. These are often found in applications with biogas plants. In addition to binary mixtures, one also speaks of quasi-binary mixtures. These are two gas mixtures of known composition.

Measuring range: binary gas mixtures 1, e.g. biogas
Accuracy: Percentage of gas in % < ± 1 % typ. mol %
Higher calorific value (Hs) ± 1 % of measured value
Density (dn)± 1 % of measured value
Repeatability2:Percentage of gas in % ± 0.1 % typ. mol %
Higher calorific value (Hs) ± 0.1 % of measured value
Density (dn) ± 0.1 % of measured value

Specifications

 
Measuring time:0.1 second
Measuring interval:1 second
Reaction time: T90 within approximately 10 s 3
Operating/storage temperature: - 20 bis + 80 °C 4
ATEX device protection class: Ԑx II 1G Ex ia IIC T4 Ga (SEV 15 ATEX 0191 X)

Media

 
Media: dry, neutral gases (10 μm filtering)
Input pressure range: Standard: - 0.5 …+ 9 bar relative / 0.5 …10 bar absolute
Extended 5: - 0.5 … + 15 bar relative / 0.5 … 16 bar absolute
Permissible overload / burst pressure: + 19 bar relative / 20 bar absolute

Electrical

 
Connector:Connector straight M12, 5 Pol, B-coded
Output signal:4 – 20 mA
Supply voltage:+12 bis +28 VDC
Maximum load:R ≤ (Vsupply - 12 V)/0.02 A [Ohm]

Mechanical

 
Gas connections: G 3/8 external thread
Dimensions (d x h): 51 x 54 mm
Weight: 0.15 kg
Degree of protection:IP65

_____
1 When mixing two gas mixtures of known composition, a binary gas mixture is created.
Information on possible applications with multi-component gas mixtures can be found in the corresponding data sheet or on request.
2 Statistical scattering value with 2 sigma of 48 measuring points
3 Strongly depending on the distance between sensor and gas line
4 Media and ambient temperature
5 For an additional charge

gasQSTM static – multicomponent gas mixtures

For gas mixtures with more than two components, the sensor is very well suited for tracking changes in gas composition due to its high sensitivity.

Measuring range: H-Gas or L-Gas or LNG gaseous 1
Accuracy2: Higher calorific value (Hs) < ± 1  MJ/m3
Relative density < ± 0.02 typ.
Repeatability3:Higher calorific value (Hs) ± 0.2  MJ/m3
  Relative density ± 0.002
Sensitivity4: Higher calorific value (Hs) ± 0.4  MJ/m3
 Relative density ± 0.004

Specifications

 
Measuring time:0.1 second
Measuring interval:1 second
Reaction time: T90 within approximately 10 s 5
Operating / storage temperature: - 20 bis + 80 °C 6
ATEX device protection class: Ԑx II 1G Ex ia IIC T4 Ga (SEV 15 ATEX 0191 X)

Media

 
Media: dry, neutral gases (10 μm filtering)
Input pressure range: Standard: - 0.5 …+ 9 bar relative / 0.5 …10 bar absolute
  Extended 7: - 0.5 … + 15 bar relative / 0.5 … 16 bar absolute
Permissible overload / burst pressure:+ 19 bar relative / 20 bar absolute

Electrical

 
Connector: Connector straight M12, 5 Pol, B-coded
Output signal: 4 – 20 mA
Supply voltage: +12 bis +28 VDC
Maximum load: R ≤ (Vsupply - 12 V)/0.02 A [Ohm]

Mechanical

 
Gas connections: G 3/8 external thread
Dimensions (d x h):51 x 54 mm
Weight:0.15 kg
Degree of protection:IP65

_____
1 Simultaneous measurement of several types of gas is only possible to a limited extent.
2 The specified accuracies apply to binary gas mixtures.
For multi-component mixtures, the accuracy varies depending on the gas family or the bandwidth to be covered.
3 Statistical scattering value with 2 sigma of 48 measuring points
4 Double value of repeatability
5 Strongly depending on the distance between sensor and gas line
6 Media and ambient temperature
7 For an additional charge

 

How often should one perform a calibration check on the gasQS™ static?

The gasQS™ static as a process instrument experiences wear from the conditions of the process in which it is installed. Temperature cycles, electronic component tolerance shift including the sensor chip and contamination build up over time on the sensor chip will all contribute to affecting the accuracy of the instrument. It should therefore regularly undergo, at a minimum, a calibration check if not a recalibration. But how often?
gasQS™ static does not have specified due dates for calibration. Mems AG designed the device from the very beginning in such a way that the above influences have the smallest possible effect on the long-term behavior of the sensor.
The entrance to the measuring chamber is protected by a double-mesh filter against the entry of dirt particles. The chip sensor has passed its long-term test in several million passenger cars as a mass flow meter of the intake air, but also in household gas meters, over more than 6 years, no reduction in performance of the sensor could be detected. When installed correctly, i.e. in upside-down position, no contamination of the chip, which would impair its function, is to be expected even in long-term operation with non-condensing gases. All electronic components meet the requirements of the strict standards of the automotive industry, so no premature aging effects should occur from this side either.
Mems suggests that gasQS™ static undergoes a calibration check every two years. However, based on the application conditions, and perhaps company quality procedures, each customer must determine when they need to send in an instrument for recalibration. The easiest way to check is to use one of the gases listed on the «Calibration Documentation» to compare the measured values obtained with those of the initial test. If this is not possible, Mems is happy to take on this task for its customers. ^top

Notice

The technical development is constantly progressing but the website does not update automatically. Therefore, technical changes to illustrations and information are reserved. We will be pleased to send you the latest version of the data sheet on request.