RKI Instruments Eagle 1 Manual - Manual (Page 49)

Eagle Instruction Manual Calibration • 42
Calibration
Calibrate the Eagle when you replace a sensor. Also calibrate the Eagle
periodically to assure proper sensor response.
You can program the Eagle to notify you when it is due for calibration
(see “Updating the Time Calibration Setting” on page 39). The
frequency of calibration depends upon the amount and type of use. A
typical calibration frequency is once per month.
Calibration Supplies and Equipment
To calibrate the Eagle, you need:
• Known calibrating samples of combustible and the appropriate
toxic gases. 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.
NOTE: If your catalytic combustible channel is calibrated to
something other than methane, use an appropriate gas
cylinder to perform the calibration.
• An oxygen-free source, such as 100% nitrogen or CO in a nitrogen
balance
• A demand-flow regulator to provide adequate sample gas flow
For one-source, auto-calibration, you can use the RKI Four-Gas
Cylinder to adjust all the sensors at the same time, automatically, with
no need for a zero-oxygen source. This section includes instructions
for calibration with the demand-flow regulator and RKI Four-Gas
Cylinder. This section also includes instructions for calibration with
individual gas sources.
Preparing for Calibration
1. Take the Eagle to a non-hazardous location with fresh-air
conditions.
2. Turn on the Eagle and allow one minute for warm up.
3. Press and hold the AIR/▲ button until a tone sounds.
The Eagle automatically sets the combustible gas and toxics
circuits to zero and the oxygen circuit to 20.9%.
4. Screw the regulator to the calibration cylinder.