MDA Scientific midas, Руководство по эксплуатации

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9 ROUTINE 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 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Note that testing or calibrating with the wrong (incorrect, out of date, non-traceable) calibration gases,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 18.
The internal pump module is designed to operate for a minimum of 18 - 24 months and it is recommended that
this pump module (part number MIDAS-A-007) be replaced every 2 years.
9.1 Sensor Cartridge Replacement
To avoid the possibility of unwanted alarms or faults Zellweger Analytics recommend that the sensor cartridge be
replaced without power to the MIDAS
®
unit. If fitting a sensor cartridge to a unit that is powered, please refer to
section 8.4.3 to inhibit the detectors outputs.
9.1.1 Sensor Cartridge Fitting/Replacement
1. Unscrew the thumbscrew located on the front panel and remove the cover by pulling it forwards off the main
chassis (see diagram 22).
2. Ensure the power switch on the terminal module is in the off position.
3. Remove the old sensor cartridge from the unit (if fitted) by unclipping the two sensor cartridge locking
tabs located either side of the sensor cartridge and using them to firmly pull the sensor cartridge out
(see diagram 23).
4. Fit the new sensor cartridge by aligning the pins at the top of the sensor cartridge with the socket in the
sensor cartridge chamber.
5. Carefully push the sensor cartridge into the sensor cartridge chamber until fully home and lock in place
using the tabs either side of the sensor cartridge (see diagram 24).
6. Switch the power switch on the terminal module to the ‘on’ position.
7. Refit the detector’s cover by aligning the slots either side with the locating tabs on the mounting bracket
assembly and pushing the cover horizontally until home. Tighten the thumbscrew located on the front panel
(see diagram 25).
NOTE: If replacing a sensor cartridge with a different gas type sensor cartridge the display will scroll the
message ‘CHANGE GAS?’ If you are changing the sensor cartridge gas type press ‘
✓
’ to accept. If not, fit
the correct sensor cartridge. The pass code (if set) must be entered to change sensor cartridge gas type.
To set the correct gas for a multi gas type sensor cartridge refer to section 8.2.2.