mlu-recordum Environmental Monitoring Solutions GmbH

- Multi-Gas Calibrator



The airQrate multi-gas calibrator provides accurate concentrations of calibration gases such as ozone, sulphur dioxide, nitrogen oxide, nitrogen dioxide, and other gases required. The airQrate generates gases for zero and span calibration. An automatic multi-point calibration is available as well. Calibrations may be performed in transfer mode or absolute mode. The modular design enables a user-defined calibrator configuration in relation to the respective application. Modular components include the dilution module and the permeation module. Up to two permeation ovens may be installed or upgraded.

The airQrate may either be operated in a laboratory using 230V or in the field using 12V (here, power supply may be provided by a vehicle, for example). A large touch screen enables easy operation.
Ethernet connectivity and RS-232 interface provide remote operation.

When calibrating in the field, bulky gas cylinders become redundant due to the internal zero air generator, the permeation ovens, and the optional internal gas cylinders (1l).


Dilution system:

This module generates required calibration gas concentrations by using two powerful high-precision flow controllers.

Gas phase titration (GPT):

Ozone is mixed with excess NO where a defined amount of NO oxidises to form NO2, e.g. NO + O3 → NO2 + O2


The permeation oven is Teflon-coated. Defined calibration gas concentrations are generated by means of permeation tubes. Up to two permeation ovens may be installed in the airQrate.

Ozone generator:

A defined ozone concentration is generated by an UV lamp. The generator provides temperature and pressure control as well as UV light control (available with optional photometer).

  • Modular design
  • Optional box housing
  • Ethernet connectivity for efficient remote access
  • Enhanced user interface (optional large touch screen)
  • Automatic multi-point calibration
  • Internal zero air supply and optional internal gas cylinder
  • Gas phase titration for generating O3 and NO2
  • Permeation oven for generating SO2, H2S, NH3, and other gases

Dilution system

  • Flow repeatability: ±0.1% FS
  • Linearity of mass flow measurements: ±0.5 % FS
  • Dilution air flow: 0-5 SLPM
  • Gas cylinder flow: 0-50 SCCM
  • Calibration gas inlet: 1
  • Dilution gas inlet: 1
  • Ozone generator (optional)
  • Maximum outlet: 1 ppm @ 5 SLPM
  • Permeation (optional)
  • Temperature: 50 °C ±0.1 °C

Physical specifications

  • Analogue test channel: 8 x 10V (12-bit)
  • Digital outputs: 4 x Open Collector
  • Digital inputs: 6 x TTL
  • Temperature: 0-40 °C
  • Dimensions: 42.5 cm W x 21.9 cm H x 58.4 cm D
  • Weight: 23 kg (26 kg for 220/240VAC)
  • Power supply: 220/240VAC; 12V

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