RKI Instruments Eagle Series - Manual (Page 51)

46 • Calibration Diffusion Eagle Instruction Manual
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 43). 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 the following:
• Known calibrating samples of combustible and the appropriate toxic
gases. The samples should have concentrations in approximately the
middle of the range of detection.
• An oxygen-free source, such as 100% nitrogen or CO in a nitrogen
balance
• A 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 a fixed-
flow regulator, RKI Four-Gas Cylinder, and Remote Detector calibration cup.
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. Attach the Remote Detector to the Eagle, either directly or with an
extender cable. (See “Starting Up the Eagle” on page 11 for more
details.)
3. Turn on the Eagle and allow one minute for warm up.
4. 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%.
5. Connect the calibration tubing to the regulator.
6. Connect the calibration tubing to the calibration cup.
7. Stand the Eagle up on its bottom end (if the Remote Detector is directly
connected).
8. Fit the calibration cup over the bottom end of the Remote Detector case.
The cup is indexed to fit the Remote Detector.