![]() This system will read 350 ppm-m because it sees 7 ppm for 50m, which is a total of gas being read. This cloud contains 7 ppm HF and is the full length of the 50m path. It comes down to a difference between math and reality.įirst, we consider a cloud that is 50m x 10m x 10m. Below are several scenarios that will demonstrate the pros and cons of monitoring your location in ppm or ppm-m. The CCU sends a scaled signal to the 4-20mA module, which forwards a 4-20mA signal to the customer. In Open Path Detection, ppm-m is the value collected by the transceiver and reported to the CCU. ![]() This is dictated as Parts Per Million Meter Per Meter and written as (ppm*m)/m, and when simplified: ppm. Open path systems use Path Integration. In an open path system, a light wave is projected from a transceiver through open air over a known distance and returned to the transceiver for analysis. Path Integration indicates a total mass of the molecule being monitored, which is a summation of the molecules measured through each meter of the transmitted path. This summation of molecules is dictated as Parts Per Million Per Meter, ppm-m for short. Path Averaging indicates the average concentration of the molecules for the path. ![]() This document will help you understand the difference and help you decide which one is right for you. ![]() Ppm-m is not a typo! “Parts per Million” (ppm) and “Parts Per Million Per Meter” (ppm-m) are not the same.
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