Eagle Instruction Manual Appendix C: Non-Standard Toxic Gas Sensors • 56
Mode to the Battery Voltage screen. If the battery voltage is close to
being considered dead, 4.5 volts, replace the batteries. A set of
batteries with full capacity will maintain a bias voltage on non-
standard toxic sensors in a stored Eagle for at least 3 months. RKI
Instruments Inc. recommends that you check the battery voltage on a
stored Eagle that includes non-standard toxic sensors monthly to
insure that the batteries are not dead.
WARNING: If the non-standard toxic sensors are allowed to be
without a bias voltage for an extended period, they will
deteriorate and no longer operate properly. Be sure to
keep fresh batteries in the Eagle when it is not being used
or if it is stored.
Calibrating Non-Standard Toxic Gas Sensors
Recommended calibration frequency for non-standard toxics sensors
is 3 to 6 months. Use the Single Calibration method to calibrate non-
standard toxic gas sensors as described in the Calibration section of
this manual with the following exception.
1. At the Single Calibration screen, press the SHIFT/▼ button to
scroll down to the appropriate gas, then press the
POWER/ENTER button.
2. Screw the regulator to the appropriate calibration cylinder.
3. Connect the tubing from the regulator to the Eagle’s probe. Allow
2 minutes for the reading to stabilize.
4. If necessary, use the AIR/▲ (increase) and SHIFT/▼ (decrease)
buttons to adjust the reading to match the concentration listed on
the calibration cylinder.
Go to the next section, “Adjusting the sensor potentiometers,” if
you are unable to match the reading to the concentration of the
cylinder.
5. Press the POWER/ENTER button to set the span value. SINGLE
CALIBRATION END displays, then the Single Calibration menu
displays.
6. Disconnect the tubing from the probe.
7. Unscrew the regulator from the calibration cylinder.
8. With the Single Calibration menu displayed, press the SHIFT/▼
button until the prompt is next to the last channel, then press the
SHIFT/▼ button again. The ESCAPE message displays.
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