RKI Instruments EAGLE 2 Manual - Manual (Page 97)

EAGLE 2 Operator’s Manual Entering Calibration Mode • 87
To calibrate the EAGLE 2, you will need:
• Known calibrating samples of the gases being detected. The combustible
and toxic gas samples should have concentrations between 10 and 50% of
the full scale value. For example, if you are calibrating the catalytic
combustible gas channel, your calibration cylinder should have a
combustible gas concentration between 10% LEL and 50% LEL. An
oxygen-free source, such as 100% nitrogen is recommended for setting
the oxygen zero.
NOTE: The catalytic combustible channel can be set up for and calibrated to
a number of different combustible gases. See “Configuring the
Combustible Gas” on page 108 for instructions. Be sure that you are
using an appropriate calibration cylinder for the target gas of the
catalytic combustible channel.
CAUTION: When using auto calibration with the standard 4-gas EAGLE 2,
although the EAGLE 2 can be calibrated with an oxygen
concentration of up to 19.5%, RKI Instruments, Inc.
recommends that the multi-gas cylinder have an oxygen
concentration in the range of 10% - 16% oxygen.
• A gas collection bag with hose clamp
• A 6 LPM fixed-flow regulator or a dispensing valve
• Calibration tubing
To calibrate the combustible gas, oxygen, CO, and H
2
S sensors at the same
time, automatically, with no need for a zero-oxygen source, you can use the
auto calibration feature with a 4-gas cylinder. If the H
2
S channel is not active,
then a 3-gas cylinder may be used for auto calibration. This document
includes instructions for auto calibration with a fixed flow regulator or
dispensing valve, a sample bag, and a 4-gas cylinder. This document also
includes instructions for calibrating one channel at a time using single
calibration.
Entering Calibration Mode
To enter Calibration Mode, do the following:
1. Find a fresh-air environment. This is an environment free of toxic or
combustible gases and of normal oxygen content (20.9%).
2. While in Measuring Mode, press and hold the RANGE ▼ SHIFT button,
then press the DISPLAY ADJUST NO button and release both buttons.