UEi Test Instruments KM9106/P User Manual

Page 25

KM9106 Operators Manual

Selecting YES allows you to set an oxygen reference value different to that shown in
the fuel constants. For example 3% is set in the Natural Gas constants, to reference
the toxic gas values to a different value select using the screen below (Use the number
setting sequence as detailed in Setting Time) :-

SET REFERENCE O2

REF. %O2 . . 03.0

This may need setting if a local authority require gas readings to be referenced to a
certain oxygen value. As a general rule gaseous fuels are normally referenced to 3%
oxygen.

NOTE: The readings can change dramatically if the wrong Oxygen reference is

set and either ppmn or mg/m3n as the gas units. If you are unsure of the
reference value set ppm or mg/m3 as detailed above.

SET NOx CALC’N

Allows the calculation for NOx to be altered. Select YES to enter the following
routine.

SET NOx REF.

REF %NOx. = 05

With only the NO sensor fitted there is no way of measuring NO2 and an allowance is
made in the calculation of the NOx value. This NOx value is calculated from the
formula shown below :-

•

NOx = NO + (P% x NO)

where P% = REF. %NOx and is set to 5% as default.

With both NO and NO2 sensors fitted the formula is as follows :-

•

NOx = NO + NO2

SET NOx REF

NOx = SUM