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Point calibration we could very closely track the CPF/RPM curve with linear
approximations over a relatively wide flow range. The microprocessor determines all
calibration constants required based on operator-entered flow rates and measured turbine
RPM during the calibration process. These constants are permanently stored in Flash
memory or until overwritten. Recalibration is only required if or when a different type of
filter media is to be used.
The Model H-810 has been designed using the latest in technology. The unit is
microprocessor-based with Flash memory to permanently store operational parameters
until overwritten. The microprocessor keeps track of turbine RPM by counting pulses
from a reflective sensor/breaker disk located in the head adapter.
INSPECTION AND MAINTENANCE OF FLOW SENSOR
1. Carefully remove front barrel (See Figure 2, Item 2) by turning
counterclockwise.
2. Inspect six holes in barrel focusing plate and clean holes with isopropyl
alcohol if there is any dirt present.
3. Inspect fan for wear around edges and the presence of dirt. This is a
compression fitted fan, which may be readily removed from the shaft for
cleaning or replacement.
4. Check space setting between front of bearing support and rear of fan. This
should be 0.5 inches.
5. Verify that fan turns freely without binding and is free of wobble, which may
indicate a bent fan shaft.
6. Replace barrel and cinch down tight. Again verify that the fan turns freely by
blowing into the barrel. The fan should come to a stop gradually and without
resistance.
7. To clean photo sensor, remove right case half (four screws). Remove photo
sensor circuit board assembly (two screws). Clean photo sensor using a soft
cloth or cotton swab and reassemble.
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