Cal Flame FM-204 Operator's Manual Page 265

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EAGLE 2 Operator’s Manual Infrared Hydrocarbon Calibration 255
If set to DISABLED, the gas reading for the catalytic LEL channel will
be replaced by dashes (---).
3. Press and release POWER ENTER RESET to save the setting and return
to the main menu.
4. Use the DISPLAY ADJUST NO button to scroll through the rest of
Display Mode and enter Normal Operation.
Infrared Hydrocarbon Calibration
An infrared hydrocarbon channel can be calibrated using the auto calibration
method or the single calibration method. To calibrate an infrared hydrocarbon
channel using the single calibration method, see “Calibrating Using the
Single Calibration Method” on page 64 and follow the instructions for
calibrating a single channel. If your instrument is a multi-channel instrument
that includes an infrared hydrocarbon channel, RKI Instruments, Inc.
recommends using the auto calibration method for convenience. The
calibration instructions below show a 5 channel instrument which has the
four standard channels, LEL/oxygen/H
2
S/CO, and an infrared hydrocarbon
channel.
The standard factory calibration for the autoranging infrared hydrocarbon
sensor is to 50 %LEL isobutane. If you need maximum accuracy in the %vol
range, the sensor may be calibrated to 50 %vol isobutane.
To use the auto calibration method to calibrate a multi-channel instrument
that includes an infrared hydrocarbon channel, do the following:
1. See “Calibration Supplies and Equipment” on page 56 for a description
of the necessary calibration supplies. In addition to an appropriate multi-
gas cylinder that is used to calibrate any active standard channels, you
will also need a cylinder to calibrate the infrared hydrocarbon channel.
See Table 32 on page 265 for available cylinders. Make sure your
calibration cylinder is appropriate for the infrared hydrocarbon detection
range.
2. Find a fresh-air environment. This is an environment free of toxic or
combustible gases and of normal oxygen content (20.9%).
3. While in Measuring Mode, press and hold the RANGE SHIFT button,
then press the DISPLAY ADJUST NO button and release both buttons.
4. If the unit prompts you for the password, enter it by using the AIR
YES and RANGE SHIFT buttons to select each password number and
then pressing and releasing POWER ENTER RESET to enter the number
and move on to the next one.
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