UEi Test Instruments KM940 - Manual (Page 19)

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Selecting YES and will display the following screen.
RESET SENSORS
O2 % : 20.9 CO & NO = 0
PRESS ENTER
MENU TO ESCAPE
After pressing the analyser will count down for 5 seconds and
then return to the main display.
WARNING :
The sensors must only be reset if you are sure they have been
sampling fresh air for at least 3 minutes. Errors in
measurement will occur if the sensors are reset during or just
after sampling.
5.2.3 Units Menu
T EMP
GAS
PRESS.
EFF.
: C
: ppm
: mbar
: GROSS
Allows all displayed units to be changed.
TEMP :
Choose selections from Centigrade °C or Fahrenheit °F.
GAS :
Changes the toxic gas measurement units. Select from volumetric readings,
parts per million (ppm) or mass flow reading milligrams per cubic meter
(mg/m3) .
PRESS. :
Flue draught can be displayed in millibar (mbar), hectaPascals (hPa),
millimeters water gauge (mmWG) or inches water gauge (in WG).
EFF. :
Efficiency can be selected for Gross or Net values. Gross efficiency assumes
latent heat of vapourisation is lost in the boiler and hence will be lower than
Net efficiency. For Natural Gas the difference will be approximately 11%.