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42 Troubleshooting
HM860 FLOWMETER
For all applications, except anhydrous ammonia,
the HM860 FLOWMETER should be thoroughly
flushed with clean water immediately after each
use.
Periodic disassembly and cleaning of the HM860
FLOWMETER is recommended for maximum
lifetime and accuracy. Some chemicals may tend
to curdle or become gummy and may require fre-
quent flushing, especially at low flow rates. Do
not allow the flowmeter to dry out before it has
been thoroughly flushed.
CAUTION: ALWAYS FOLLOW MANU-
FACTURER’S RECOMMENDATIONS
WHEN WORKING WITH CHEMICALS.
1. The HM860 FLOWMETER SENSOR will
output a pulse, as the North and South poles
on a magnet pass over the sensor’s end.
To check the sensor, plug the sensor cable into
the 8605 controller flow input. Set the flow meter
calibration to 1.00. Clear the total volume dis-
play by depressing the Total Volume key for 3
seconds.
The controller total volume display should count
up by one each time a magnet is passed un-
der the bottom of the sensor (sensor is removed
from flowmeter).
2. Make sure direction of flow (arrow on
flowmeter) is correct.
3. Check flowmeter for debris slowing or stop-
ping the turbine. For the flowmeter to mea-
sure accurately it must be kept very clean.
4. For application rates under 5 gallons per
minute, the flowmeter should be mounted
vertically with the flow going up.
5. Make sure magnet on turbine is positioned
under sensor.
6. Make sure sensor is inserted fully into me-
ter.
7. Flowmeter operation may be affected by
strong magnetic fields such as those cre-
ated by motors and solenoid valves.
INLET
BUSHING
TURBINE
O RING
SENSOR
BEARING
BUSHING
BEARING
OUTLET HOUSING
DECAL
CALIBRATION
DWG. NO. 2767