Page 55 - Sterilization Training Manual

June 26, 2013
Subject: Two Point Calibration – Linearity H2O Channel
Product: SEC Signature DIR
The response curve for water vapor (H2O) is inherently non-linear. The sensor uses a linearization algorithm to produce an output linear to concentration. The Zero operation (with N2) teaches the sensor what no gas looks like, the Span operation teaches the sensor what 1/4 scale (75 mg/l) looks like. The sensor then uses these two points to align the analog signal to the digital linearization curve. This ensures linearity over the full, fixed sensing range, 0-300 mg/l. Accurate Zero and Span points are critical to producing an accurate linear output.
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