Honeywell Midas, User Manual

Page: 75 / 160

Midas
®
Gas Detector
8-2
8 Maintenance
Midas
®
is a fully serviceable product designed with
modular components that can be readily replaced
by trained service personnel so as to minimize the
time that the gas detector is not available.
External in-line air filters should be replaced every
three months or more frequently if the system is
sampling in environments that have high levels of
particulate matter or very acidic / wet atmospheres.
Similarly, the internal particulate filter should be
replaced once a year or more frequently if the
sample lines are prone to heavy contamination.
Every sensor cartridge is shipped with a 12 month
warranty and an extended 2 year warranty sensor
cartridge is also available for purchase. All sensor
cartridges are factory calibrated to traceable
national standards before shipment to the end user.
Note that testing or calibrating with the wrong
(incorrect, out of date, non-traceable) calibration
gases, calibration equipment, methods or operating
conditions can actually damage the sensor
cartridge’s lifetime and alter the calibration
adversely. Only qualified calibration technicians
should attempt to calibrate the Midas
®
gas detector.
Note
For details regarding sensor cartridge
calibration and bump testing method refer
to Section 17 .
The internal pump module is designed to operate
for a minimum of 24 months and it is recommended
that this pump module (part number MIDAS-A-007)
be replaced every 2 years.
Recommended Maintenance Schedule
Component Frequency
Pump 2 years/as needed
Pyrolyzer (all models) 1 year
Internal Filter 2 years/as needed
External Sample Line Filter 780248 3-6 months
1991-0147 3-6 months
1830-0055 3-6 months
1830-0027 1 month
Leak Check Leak Check every 6 months
or after pump, pyrolyzer or
internal filter replacement.
Bump Test 6 months
Flow Calibration Flow Calibrate after pump,
pyrolyzer or internal filter
replacement.
See Appendix B for the correct filter requirement for
your application.
Note
The CO2 cartridge MIDAS-S/E-CO2 bias
battery will last only about 9 months. After
replacement, allow at least a day for the
cartridge to reach equilibrium.