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4.
DR-7 Nomenclature
This section introduces the user to the major components of the DR-7 Direct Reading Ferrograph
Instrument. The following subparagraphs discuss the major components, their location, and the
nomenclature for each item on the DR-7 Direct Reading Ferrograph Instrument shown above.
1)
Vial Holder:
Holds two sample vials and mounts on the top of the DR-7 with two screws. Do not use
this as a handle to pick up the unit.
2)
End of Oil Sensor:
The end of oil sensor will sense the meniscus created in the precipitator capillary
tubing when the test is completed, automatically freezing the DL and DS readings. The DR-7 will
record the readings if the sensor is bypassed by pressing the STOP button when the technician
determines that the test is completed.
3)
Tubing Guide:
Used to bend and guide the capillary tubing without kinking from the vertical position
to the inclined magnet assembly. Tubing is held in place by weaving it through the three pins.
4)
LCD Screen:
This touch screen displays the set up and operational screens which have several options
available besides the calibration menu.
5)
Optics Assembly:
Holds the glass precipitator tube assembly.
6)
Magnet Assembly:
Magnets designed to attract the ferrous particles on the bottom of the glass
precipitator tube to obtain the DL and DS readings.
7)
Left Bulkhead:
Where the end of the precipitator tube connects to the pump head.
