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General Information

The main part of the QE-probe XS11 is a potentiometric solid electrolyte cell (zirconia sensor).
This sensor continuously receives a gas sample via gas flow over a heated catalyst (complete decomposition of NH3). Cell and catalyst have a temperature of 760 °C to avoid unwanted reaction products (e.g. CH4). The designation QE-Probe points out that the quotient of partial pressures of the reactive furnace gases (only gases reacting with oxygen) at totally reached equilibrium can be calculated from the probe signal. Water vapour and hydrogen or H2O+CO2 and H2+CO in the water gas equilibrium shall serve as an example.

The QE-Probe is calibration-, drift- and maintenance-free. The use of high-quality components and materials guarantees high long-term stability.


The QE-probe is used in hardening technology in nitriding and nitrocarburizing processes.
It serves the monitoring of the protective gas. By combining the signals of a QE-probe and a Q-probe, the nitriding character KN or carburizing character KC can be adjsuted and controlled as well as, if necessary, the carburizing character KC considering the unburnt gas compound.

Technical Data QE-Probe XS11.QE

Length300...1800 mm
Diameter25 mm
Weight1...3.5 kg
Dimensions clamp headapprox. 90x90x200
Protection degreeIP20
Power supply24 V (DC or AC)
Heating resistance AC / DC20 Ω
Heating current AC / DC1.2 A
Heating power AC / DC30 VA
Accuracy< 5 % rel. error
Sensor temperature
(in the probe head)
760 °C
Offset<10 mV
Thermocoupletype B (800 °C corresponds to 3.2 mV)
Flow measuring gasmax. 1 l/h
Clamp assignment:
(1) GroundAGND
(2) Sensor voltage-Vz
(3) Thermal voltage+Vt
(4) HeatingVH
(5) HeatingVH

Mounting recommendation:

  • stuffing box or cutting ring fitting


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