Measurement and Testing

Updated HY-ALERTA Spec Sheet

Nov 28 2017 Read 176 Times

You can now view our updated spec sheet for our HY-ALERTA™ 600B, 1600 & 2620 - here>>

The H2scan HY-ALERTA™ fixed area monitors provide fast hydrogen-specific leak detection and safety monitoring from 0.4% to 5% hydrogen (10% to 125% of hydrogen’s lower explosive limit). No cross-sensitivity to other combustible gases prevents false alarms and improves reliability. Capable of operating with or without air/oxygen present.


The HY-ALERTA™ area monitor is a reliable, consistent hydrogen gas detector for industrial markets. H2scan uses a solid-state non-consumable sensor for direct hydrogen measurement in air or inert gases, with no cross sensitivity to other combustibles.


How it Works
A thin film palladium-nickel alloy absorbs and desorbs hydrogen as it comes in contact with the sensor. The palladium catalyzes the hydrogen molecule into atomic hydrogen, which gets absorbed into the metal lattice and changes the bulk resistivity. This change in resistance is calculated very accurately and reported in real time. The analyzer is hydrogen specific because even though palladium can catalyze several elements, only hydrogen can penetrate the lattice structure at a rate that is meaningful to the measurement. As a result it is unaffected by any other gases. Since it is a solid state device, the sensor does not degrade over time. The output reports the partial pressure of the hydrogen in the background, which corresponds to the hydrogen concentration.


Ease of Use

With no moving parts, the analyzer is extremely reliable and easy to use. Once installed, it typically only requires a quick calibration every three months, using readily available bottled gas mixtures of 1% and 2% hydrogen in air. No other maintenance is necessary. Communication is either via an analog 4-20mA output or serial communication using RS232 or RS422, depending on the model.


Performance and Safety

The safety monitor is intended for use in an air, oxygen, or inert gas background where hydrogen is only occasionally present for short periods, as may occur if there is a leak or off gassing from batteries. The detection range is from 4000 ppm to 5% hydrogen, covering 10% to 125% of hydrogen’s lower explosive limit. The monitors can be ceiling, wall, or pole mounted for optimal performance. H2scan offers general use, intrinsically safe, and explosion proof models to meet any safety monitoring need.


For further information, please contact:

For further information or to place an order, please contact:



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