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SPM Flex Gas Detector
K-factor
K-factor is a feature that allows gases’ cross-sensitivity to be employed to
measure a target gas after calibrating the detector with a different gas� The
advantage for the user is that a small number of calibration gases can be used
to calibrate a detector for a wide range of target gases� The detector’s readings
are modified by the known relationship between the two� For example, a 5
ppm concentration of Gas A is seen by the detector as the same as a 5�8 ppm
concentration of Gas B� The K-factor is 1�2 (5�8 ÷ 5 = 1�16 = 1�2 when rounded to
one decimal place)� Therefore, the detector with a Gas A Chemcassette cartridge
can be used to accurately detect Gas B by multiplying the Gas A reading by 1�2�
The feature can also be used to compensate for diluted samples� For example,
when reading a gas that has been diluted 5:1, the K-factor feature will will enable
the detector to yield a reading of the undiluted gas�
K-factor conversions are performed by the detector automatically� The K-factor is
at Main menu > Set up > Monitoring > Gas.
If desired, an alternative name can be assigned to the K-factor target gas� This
would be useful if, for example, a certain dilution of a gas was being detected�
With K-factor enabled, navigate to Setup > Monitoring > Gas > K-factor > Alt� gas
name > Edit� A name with up to eight characters can be entered from that screen�
Save the name by pressing the Accept button�
Stale tape feature
When a Chemcassette cartridge is installed, the detector reads information
about it, including the Allowable Days After First Use from its RFID tag (see
“Detectable Gases” on page 62)� By default, the detector will issue a Stale
Tape maintenance fault after that number of days� For situations in which the
cartridge will be used for a short period of time and then properly stored in its
Chemcassette cartridge bag, the user may turn off the maintenance fault� If
a cartridge is installed and in Monitor mode and then reaches the Stale Tape
date or the Expired Tape date, it will continue monitoring� (While the “CAUTION:
Chemcassette is XXX days past recommended use” screen is displayed, press
the Accept button to acknowledge the maintenance fault and continue using the
cartridge�) The cartridge can then be used past the Stale Tape date (but not past
the Expired Tape date)� A history event is created for all expiration faults�
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