he H2Smart™ measures Hydrogen content with high accuracy in process atmospheres. It features an integrated sampling system with flow control which assures reliable sampling and measurement. The H2Smart™ can be used stand alone or integrated into a new or existing control system.

H2Smart™ is available in 3 models:

  • Base model for % H2 measurement
  • LT model includes base capabilities plus simplified KN calculation
  • PRO model includes LT capabilities plus extended calculation of pH2, pNH3, pO2, pCO, pCO2, KN, KC, KO and dissociation



  • Internal calculation of process parameters
  • Built in pump and sampling flow control assures reliable sampling
  • Built in internal temperature control ensures stability over a large ambient temperature range and protects the system from condensation and contamination during nitrocarburizing and post oxidation processes
  • Alarms for system failures, sampling flow out of range etc.
  • No need for a reference gas cell simplifies installation and usage
  • Analog signals and industrial communications protocols supported
  • Sensing block and electronics embedded in the same enclosure
  • Integrated web server with access to diagnostics, configuration, and maintenance
  • Analog signals and industrial protocols available
  • O2 sensor and O2 sensor temperature inputs available
  • High accuracy and repeatability
  • Retrofittable on existing equipment or new installations
  • Built-in communication devices interface with process supervisory and automation systems
  • Built-in Ethernet connections
  • Remote Diagnostics/Troubleshooting possible
  • Active closed-loop sampling flow control with warning and alarm
  • System status displayed on a large, easy to read LCD display
Power requirements: 2.5 Amps max.@ 24 VDC
Outputs: 2 x analog, sourcing, individually isolated,
4 -20 mA (R<500 Ohm)
4 x digital OUT, 24 VDC, 0.7 A max.
Inputs: 1 x analog, dedicated temperature sensor (optional)
2 x digital, 24 VDC
Weight: 8.8 lb / 4 kg
Dimensions: 7.5” H x 6.7” W x 5.5” D
190 H mm x 170 mm W x 140 mm D
Process connection ¼” tubing (6mm tubing adaptor available)
Accuracy: +/- 0.5% of reading plus +/- 0.3% of full scale
Linearity: < 0.5% of full scale
Repeatability: < 0.5% of full scale
Zero drift: < 0.5% of full scale per month
Sampling flow: 0.5 lpm / (1 cfh) controlled
Response time: 95% in 30 sec @ 0.5 lpm / (1 cfh)

Factory Calibration

H2Smart™ comes factory calibrated and is ready to use out of the box. To prolong its performance and ensure continued measurement accuracy, we recommend an annual factory calibration complete with certificate.


% H2 Measurement
Simplified KN Calculation*
Full KN, KC, KO, Calculation**
Modbus TCP/IP
Profibus, Modbus RTU or CAN Bus
O2 Probe (FNC option)
Plate Assembly
Chart Recorder
  • Standard

⏹ Optional

* Simplified KN Calculation – for NH3  and dNH3  atmospheres only

** Full KN, KC, or KO Calculation – for NH3, dNH3, CO, CO2, N2 and H2O atmospheres