Many options available

List Price for 0-100 Vol% H2 in N2:    3400 €

If you are not sure whether this unit is suitable for your application, please do not hesitate to contact us for further information

  • TCD 3000 is a gas analyzer with the build-in TCD 3000 GC detector. The measuring principle takes advantage of the fact that the thermal conductivity of a gas mixture depends on the concentration of the individual components. Using this technique, (quasi) binary gas mixtures can be analyzed precisely. In this product all the advantages of our TCD 300 GC OEM are packed in a ready-to-use gas analyzer. Its compact size allows easy integration, and its plug-and-play style makes it quickly ready to use. Further customization is possible through many additional options. The device runs with IP67 protection class.
  • The unit is completely equipped with metal-to-metal connections, so that a high degree of tightness and pressure resistance over 200 bars can be guaranteed.
  • The sensor has corrosion and humidity protection.
  • This gas analyzer is an ideal solution for analyzing the concentration and purity of hydrogen or helium. Of course, is also suited for other gases and binary compositions, such as H2 in O2, He in Ar and CO2 in N2. For further information, please have a look at the listed gas types or contact us.


  • Fast: t90 < 0.5 s
  • Miniature: B=54 mm, H=80 mm, D=34 mm; 500 g
  • High stability < 50 ppm a week*
  • High sensitivity: < 0.5 ppm
  • Easy to use


  • Precise analysis of purity or qas concentration in binary gas mixtures
  • Very low noise: < 1 ppm
  • Very High Dynamic Range: 106
  • Concentration: 20 ppm to 100 % level
  • Detection limits: 1 ppm


  • Control and reading.via RS-485
  • 4-20 mA
  • TTL 3.3 V on Request


  • Dimensions without tubes (W x H x P in mm): (54 x 80 x 34)
  • Tubes on reauest
  • Protection class: IP67
  • Technical Details
  • Accessories
  • Downloads
  • More Information
  • Options
  • Gas Types

Technical Details

General: TCD3000
Measurement process Thermal conductivity
Sampling Analyzer extractive
Connection 6 mm pipe
Dimensions (WxHxD in mm) 145 x 80 x 85
Protection class IP 67
Pressure-proof to 20 bar absolute
Power supply 18 V to 36 V DC / 700 mA
Ambient temperature range -20° C to 50° C
Weight to 1800 g
T90 time at 60l/h < 1sec
RS232 Yes
Current output 1x, 0/4-20 mA
Voltage output 2x, 0-10 V
Display Yes
Relays 3x
Service program SetApp 2.0 Yes
Calibration on site Yes
Flow measurement Yes
Flow monitor Yes
Multi Gas Mode Yes, additional up to 99 gas pairs
Protection against corrosion Yes
Protection against condensate and dust Yes
Suitable for inflammable gases Yes
Additional Modules Compatible Yes (O2)
Moisture measurement Yes
Cross-sensitivity compensation Yes, external signal required
Specifications gas analysis:
Noise 50 ppm
Drift at zero point per week 100 ppm
Repeatability 50 ppm
Non-linearity 50 ppm
Measuring error with ambient temperature change per 10°K 50 ppm
Flow influence between 60 l/h and 90 l/h per 10 l/h 50 ppm
Fault with measurement gas change (Pabs > 800 hPa) per 10 hPa 50 ppm




More Information

About function:


The measuring principle is based on thermal conductivity. Gas mixtures differ in their thermal conductivity dependent on their compositions. Different values for analyte and carrier gas ensure high measurement accuracy where even smallest amounts of gas can be determined precisely.

About calibration:

We recommend to do a calibration at one point with a pure gas or bottle gas. After the gas is applied to the device wait until the concentration is stable. The calibration process can be started via the keys on the front of the analyzer or via RS232 command. Then it takes ten seconds for the actual calibration.

We recommend a calibration, resp. a check of the calibration if one of the following criteria is met:

  • After bringing the device into service
  • On a regular cycle, depending on the precision aimed for.

    To find out the appropriate time between calibrations, we recommend to begin with a more frequent check of the calibration.

    The time between calibrations can range between:

    • several month for a measuring task in the Vol.% range
    • days to weeks for a measuring task in the sub-Vol.% range
    • directly before every measurement if highest accuracy is needed
  • When the situation of the measurement regarding pressure, temperature or gas flow changes


About calibration:

The calibration should be performed according to the following criteria:

  • After bringing your device into service
  • When the measurement characteristics changes, such as pressure, temperature of gas flow
  • At regular intervals, depending on the desired precision
  • Once in a few month for Vol.% accuracy
  • Once in a few days or weeks for sub-Vol.% accuracy
  • Right before measurement if highest accuracy is desired

We recommend a calibration with pure gas or bottle gas. To initiate, apply pure gas or bottled gas to the device and wait until the concentration is stable. The calibration process can be started via the keys on the front of the analyzer or via RS-485 command and takes  approximately 10 seconds.


About Pneumatic Connection

The pneumatic connections of TCD3000 are bidirectional. 
The units are delivered with fittings for 6mm pipes. The metal-sealing fittings can be mounted radially. This makes the device very easy to mount and dismount. 
Flow range is designed for 10 l/h -120 l/h. 
The following options are available on request: 
Reduction of pipe diameter, 
larger/smaller flow range, 
larger pressure range 
For installation, use dimensionally accurate, cleanly cut and deburred tubes with a smooth surface. The fitting needs a straight pipe end of at least 1.5 x d. 
Insert the tube as far as possible into the fitting. 
Screw fitting nut on by hand as far as it will go. 
Tighten the fitting nut with an open-end wrench by approx. 1¾ turns. The tube must be pressed against the main part. 


About operation

The thermal conductivity analyzer needs pneumatic connection to sample gas.

Further, it is designed for wall mounting.
The analyzer has cables with open ends, a connection to a 24 V source is necessary for operation. A 4- 20 mA output, relays and RS-232 can be connected as required.


About measuring ranges:

    We offer 0-100 Vol.% H2 in N2 (and many other background as Ar, CO2, O2, CH4…)

  • The smallest range for low H2 concentration is 0-0.5Vol.% H2 in N2.
  • The smallest range for high H2 concentration is 98-100Vol.% H2 in N2.

    Helium is similar with the ranges:

  • The smallest range for low He concentration is 0-0.8Vol.% He in N2.
  • The smallest range for high He concentration is 97-100Vol.% He in N2.

Any range in between is available.

About operation:

The analyzer need pneumatic connection to the sample gas. It is designed for wall mounting.

The analyzer comes with cables with open ends. Connection to 24V is necessary for operation.

Connection of 4-20mA output, relays and RS232 are available and can be connected as required.

Choosing the right solution:

If you are not sure whether this unit is suitable for your requirements, please contact us for product advice.
In download area you can find a measuring task form, which supports you find out specification of your application.


Gas Types


Please do not hesitate to contact us if you would like a quote or have a question. You can reach us via the contact form and via the e-mail address below. Before making an offer, we clarify the requirements with a form for the measuring task. This way we want to make sure that you will receive the device from us that best fits your measuring task.

Contact Info

phone : +49 (0)69 247544980

e-mail:   [email protected]

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