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7. MAINTENANCE
S304/305 Dust Monitors needs very little maintenance. To achieve maximum
reliable operation the recommended maintenance interval is 2 months.
Maintenance is done by removing the unit from the socket and cleaning the
probe to prevent signal leakage to ground.
If the particles in the gas are sticky and tend to build up, use air purge adaptor
and compressed clean and dry process air to keep the sensor base clean.
Inside enclosure maintenance is not needed.
8. TROUBLESHOOTING
The Monitor is not giving output signal
1. Check the power and signal wiring is right connected.
2. Check there is power on and three digit display is showing measurement
readings and it is possible to change and save parameters.
3. Check the parameter settings
If the monitor is not giving any output signal after checks 1,2 and 3 contact
your local distributor.
The Monitor is giving 4mA or 20mA continuously after
autosetup procedure.
1. Check that there is normal process going on and during
autosetup there are normal operation conditions. Check that the
dust concentration really is not the zero or over the range.
2. Check the power and signal wiring is right connected
3. Check the signal is not leaking to ground.
- Contact between sensor probe and duct wall is not allowed.
- The gas should not be condensing
- Check the sticky dust does not build up to the base of the
sensor and does not make the bridge between sensor probe and
duct wall. If the dust is bridging, the air purge is needed.
4. Check the parameter settings and check the monitor is not in the
service mode
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