H2scan’s HY-ALERTA™ 2600 Explosion Proof Area Hydrogen Monitor provides hydrogen-specific leak detection and measurement for hydrogen concentrations as low as 4000 ppm and can be scaled to any concentration up to 5% hydrogen by volume, a range representing 10% to 125% of hydrogen’s lower flammability limit.

1. • Hydrogen specific solid-state sensing technology that has both resistor
and capacitor circuits for H2 measurement/detection from 15ppm to
100% v/v.
• Palladium – Nickel alloy films provide high stability.
• Proprietary coating enables continuous operation in harsh
contaminant environments.
• Temperature control loop compensates for external fluctuations.
• Sensor capable of operation in N2, O2, other inert gas backgrounds
and multi-component, varying gas and liquid streams.
Technology Background

2. H2 Specific Resistor Circuit
• Pd catalyzes H2 (molecular) into 2H (atomic)
• Hydrogen absorbed - changes Bulk Resistivity
– Hydrogen Sensing Resistor (HRES) uses
this property to measure Hydrogen from
0.5% to multiple atmospheres.
– On-chip heater and temperature sensor
H2 Pd-Ni
H
Sqrt( % H2)
1000.5
∆R/R
HRES

3. H2 Specific Capacitor Circuit
Charge Density– Hydrogen Sensing Capacitor (HCAP) uses
this property to measure Hydrogen from 15 ppm to 0.5%
(in air).
HCAP
Pd-Ni
H2
H
Charge Density
varies with H2

4. Sensor Integration
Flexible circuit
Sensor Electronics
Protective screen
Sensor