Thermo Scientific Sarasota FD900, User Manual

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5-6
User Guide for Sarasota ID900, FD900, & PD900 Gas Density Meters Thermo Fisher Scientific
Maintenance
Cleaning
4. Clamp the body vertically with the spool opening upward.
5. Place the cleaned spool into the body cavity, lining up the hole inthe
spool with the locating pin in the body.
6. Carefully move the spool up and down to check that it does not bind
on the pin.
7. Install the locking ring and finger-tighten to the spool. Then release
one turn.
8. Move the spool to check freedom of movement and correctseating.
9. Use a torque wrench (not supplied) for the following steps:
a.
Apply steadily increasing pressure in a clockwise direction to5.5
Nm (4 lbf.ft), which is the equivalent of tightening the ring by
hand.
b. When the torque wrench is felt to give, do not continue for more
than a quarter turn. Do not allow the wrench head to click back.
Remove the torque wrench and turn the end by hand until itclicks.
c. Loosen the lock ring two turns, move the spool to ensure correct
seating, and tighten again as in step 9. Wrench rotation should be
at a constant speed.
d. Repeat the procedure 3 times until consecutive Tair readings are to
within 0.002 to 0.003
µ
s.
10. Take a reading of Tair to within 0.001
µ
s and note the air temperature.