The monitor is designed for either ceiling or wall mount and has an RS422 capability that extends the interface from the Sensor Module to the Control Module to several hundred feet. H2scan's hydrogen-specific sensor technology has no cross sensitivity to other combustible gases, thus eliminating false positive alarms and ensuring safety system reliability. Specification Information Performance Hydrogen Sensitivity Range: 0.4% to 5.0% hydrogen by volume 10% to 125% hydrogen lower flammable limit Accuracy: ± (0.03 x indication + 0.2) percent hydrogen by volume Typical Response Time: T90 of 60 sec maximum Ingress Protection: IP66 Calibration Interval: 90 days Product Life Expectancy: 10 years