RKI Instruments GP-01 - Manual (Page 16)

11 • Operation Model GP-01 Operator’s Manual
NOTE: The peak gas reading is cleared automatically when the Model
GP-01 is turned off.
1. The unit must be in Measuring Mode. The current gas concentration
should be displayed on the LCD.
2. Press and release the POWER/MODE button to enter Peak Gas
Display Mode. The LCD backlight will activate and the LCD will display
the peak gas reading. A small peak symbol is displayed in the upper left
corner of the LCD.
3. Press and release the POWER/MODE button once again to return the
unit to Measuring Mode.
NOTE: If you do not press a button for 20 seconds while displaying the
peak gas reading, the unit will return to Measuring Mode
automatically and the backlight will turn off.
Combustible Gas Detection
There are three issues that must be considered when checking for
combustible gas.
• The combustible gas sensor will respond to any combustible gas. The
standard calibration for the GP-01 is to methane (CH
4
). If the
instrument is to be used to monitor for a different combustible gas, such
as hexane or propane, it should be calibrated to that gas.
The table below lists the conversion factors for several hydrocarbon
gasses if the GP-01 is calibrated to methane. To use this table,
multiply the display reading on the GP-01 by the factor in the
appropriate row to obtain the actual gas concentration. For example, if
you are detecting pentane and the display reads 10% LEL, you actually
have 10% LEL x 1.35 = 13.5% LEL pentane present.
Figure 4: LCD in Peak Gas Display Mode
.
Peak
Symbol
0
Battery level
Gas concentration
% LEL