PROGRAMMING
4-6
gas that contains a known concentration of a given gas is
used to set the second point of reference.
Note: The span value must be set prior to calibrating for
fresh air or span.
The user can store calibrations for up to 8 different
measurement gases. The default gas selections are as
follows:
Cal Memory #0……Isobutylene
Cal Memory #1……Hexane
Cal Memory #2……Xylene
Cal Memory #3……Benzene
Cal Memory #4……Styrene
Cal Memory #5……Toluene
Cal Memory #6……Vinyl Chloride
Cal Memory #7……Custom?
Memory #0 functions differently than the other 7
memories. For Memory #0, isobutylene is always the
calibration gas. When the gas is changed in Memory #0 to
one of 100 other preprogrammed chemicals or to a user-
defined custom gas, a correction factor is applied to all the
readings. During calibration, the unit requests isobutylene
gas and displays the isobutylene concentration
immediately following calibration, but when the unit is
returned to the normal reading mode, it displays the
selected gas and applies the correction factor.
The other 7 cal memories require the same calibration gas
as the measurement gas. These memories may also be
modified to a preprogrammed chemical or to a user-
defined custom gas. In the gas library, only the gases that
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