RKI Instruments 71-0191RK - Manual (Page 21)

Conversion Table Tab • 18
may contain any character in upper- or lower-case.
• Factor
This value is the response factor for the listed gas relative to
methane. The factor for each pre-defined gas is factory defined.
The factor for any user-defined gases must be obtained through
testing as described in “Obtaining a Relative Response Factor” on
page 28. Even if not all of the user-defined catalytic combustible
channels are being defined, the Factor column must have a valid
number entered. A valid number for the Factor is a value between
0.01 and 25.00.
• 1st
This column is for the low alarm point of each gas in ppm units.
• 2nd
This column is for the high alarm point of each gas in ppm units.
• Ratio
The ratio is the ppm value of the LEL for each gas. This value is
specific to each gas and can be easily determined. The maximum
value it may be set to is 150,000 ppm. If an invalid number is
entered, the box will turn red when the csv file is imported back
into the Maintenance Data Loader Program.
NOTE: If you define a gas whose LEL is above 50,000 ppm, the
%LEL reading in Measuring Mode will reflect the defined
ppm ratio, but the ppm reading in Measuring Mode will not
indicate above 50,000 ppm. For example, if you set the ratio
to be 150,000 ppm and set the catalytic combustible channel
to display the reading in ppm, the gas reading will not
indicate higher than 50,000 ppm, the equivalent of 33 %LEL
and 5% volume for this ratio, but will continue to indicate
%LEL readings up to 100 %LEL and %volume readings up to
15 %volume, the equivalent of 150,000 ppm, if the display
units are changed to %LEL or %volume. In addition, all
adjustable ppm parameters cannot be set higher than 50,000
ppm.