59
SPM Flex Gas Detector
Cleaning the tape-contact surfaces
Over prolonged monitoring periods, the chemical components of some
Chemcassette cartridges can be deposited on the detector’s tape transport
surfaces� When replaced by a cartridge with a different target gas, these deposits
may cause stains on the Chemcassette tape that are falsely interpreted as gas
concentrations� This chemical incompatibility has been particularly noted in the
combinatons in this chart�
Chemical Incompatibilities
When this Chemcassette
cartridge...
...is replaced by this Chemcassette
cartridge:
Gas family Part number Gas family Part number
F
2
/O
X
1265-3004
or 1265-4004
Hydrazine
1265-3008
or 1265-4008
XP Cl
2
1265-3002
or 1265-4002
O
3
1265-3011
or 1265-4011
XP Hydrides
1265-3000
or 1265-4000
XP Mineral
Acids
1265-3001,
1265-4001,
1265-3012,
or 1265-4012
To prevent these false readings, whenever changing a Chemcassette cartridge to
one of a different gas family, thoroughly clean all of the detector’s tape transport
surfaces (the entire area of the optics gate) with methanol or 6% IPA alcohol
using cotton swabs or a similar non-abrasive cloth
2
�
2 Refer to TechNote 971304
Hydrazine/Oxidizer Gas Monitoring Applications
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