Model IR5500
39
4.8 Finish “Fi”
Apply the magnet when “
Fi
” is showing and the unit will exit the Options Mode, save
any changes that were made, and return to normal operation. This is the only way
changes made in Setup Mode are saved.
4.9 Maintenance
After the Model IR5500 has been initially aligned, the unit requires little
maintenance. Although calibration is not required, response should be tested from
time to time using the Test Gas Films designed for the IR5500.
If the Model IR5500 is operated under dusty or dirty conditions, the windows should
be cleaned periodically. This is accomplished by gently wiping them with a soft,
clean cloth, which has had a commercial window cleaning solution applied. Water
and ethanol are suitable solvents. The cleaning should be done in Test Gas Mode to
prevent false alarms.
The estimated mean time between failures (MTBF) for the Source lamp is 4 years.
Should the Source lamp need replacement, use the Lamp Replacement Kit listed in
the Spare Parts section.
The Model IR5500 Gas Detector should be stored in a clean, dry area, and within
the temperature and humidity ranges noted for environmental specifications in
Section 8.2. Insert the red dust caps into any vacant cable entry holes while the unit
is stored.
NOTE
: The IR5500 will detect vapors from alcohol and other cleaning solvents.
4.10 Display and Fault Codes
The display codes during normal operation are:
SU
Start-Up - This is displayed immediately after power is applied and lasts for
approximately two minutes.
SF
Re-Start from an optical Fault - This is displayed when an optical Fault
condition has been corrected.
0-50
Steady Numeric Indications - This is displayed when a concentration of gas
is detected in the operational mode.
0-50
Flashing Numeric Indications - This is displayed when a concentration of
test gas is at the detector in the test gas mode.
Other codes that can appear on the display are Fault codes, which are listed in the
following section.
4.11 LEL and ppm Negative Drift Faults
The ppm negative drift fault occurs when the IR5500 is zeroed with a small
background gas and strong air currents dissipate the remaining gas. Under such
circumstances, the ppm range current may decrease to 0 mA, prompting the
detector to produce a fault.