6 Maintenance
WARNING!
Use only genuine MSA replacement parts when performing any maintenance procedures provided in this manual. Failure to do
so may seriously impair sensor and gas monitoring performance, alter flameproof/explosionproof characteristics or void
agency approvals. Failure to follow this warning could cause the product to fail to perform as designed and persons who rely on
this product for their safety could sustain serious personal injury or loss of life.
Repair or alteration of the S5000 Gas Monitor, beyond the scope of the maintenance procedures provided in this manual or by
anyone other than authorized MSA service personnel, could cause the product to fail to perform as designed and persons who
rely on this product for their safety could sustain serious personal injury or loss of life.
The S5000 Gas Monitor is constantly performing a self-check. When a problem is found, it displays the appropriate error
message (see6.5 Troubleshooting). When a critical error is detected within the device, the 4-20mA output signal goes to a
fault condition of 0mA, 1.25mA, 3.5mA or user defined level.
6.1 IR Sensor Cleaning Procedure
The presence of particulate matter, oil films, liquid water, or the residue from water drops on the two monitor windows can
adversely affect its performance. The sensor guard is designed to prevent foreign solids or liquids from reaching the monitor's
optical system. Additionally, heating elements are incorporated into the device to prevent water condensation. Under severe
conditions, however, some material may collect on these surfaces and it may be necessary to occasionally check and clean
the windows.
While both windows are made of a highly durable material that is not easily scratched, avoid excessive pressure when
cleaning them. Clean, cotton-tipped applicators are the most convenient tool to remove material collected on the windows.
1. Remove the sensor guard.
2. Use a dry applicator or one moistened with distilled water to wipe the window and remove dust.
3. Use an additional clean, dry applicator to remove any residual water.
4. Use an applicator moistened with isopropyl alcohol to remove heavy deposits of solids, liquids or oil films. Clean the
window again with a second applicator moistened with distilled water; then, dry the window with a final applicator.
Avoid using excessive amounts of water or alcohol in the cleaning procedure, and inspect the window to ensure that the
entire surface is clean.
5. The device will go into a “Cleaning required” fault with an analog output of 2.0mA when cleaning is needed.
The S5000 analog output may go down to 1.25mA while the optical path is blocked, and display will indicate “Beam
Block”.
While in "Beam Block" fault, the sensor will not respond to the presence of gas.
6. When cleaning is done and the objects are removed from the sensor window, the device returns to normal operation. If
water or isopropyl alcohol was used, allow the device to operate for 15minutes to completely dry before replacing the
sensor guard continuing to monitor for combustible gas.
7. Replace the sensor guard.
When the cleaning process is complete, be sure to remove all objects from the light path. It is recommended to
check the sensor’s response to zero and calibration gas after cleaning.
73
6 Maintenance US
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