fann 210194, Manual

Page: 34 / 56

Stirring Fluid Loss Manual
100031980 Revision F 34
7.4 Pressure and Motor Check
Follow these steps to ensure proper operation:
1. Rotate the heating jacket until the handle and lock clamp are up. Verify the
pressure tubing does not interfere with the rotating mechanism or heating unit.
2. Fill the sample chamber 3/8-1/2 full, approximately 400 mL with distilled water
and re-assemble.
3. Install the sample chamber in the heating jacket and secure it in place with the
lock plate and knob clamp. Attach the pressure line to the side pressure port on
the sample chamber. Hand- tighten only. Make sure the valves on both ends of
the chamber are closed, and the console nitrogen vent valve is closed. Put tygon
tubing over the nitrogen vent valve outlet and the free end into a cup.
4. Connect a nitrogen source of at least 1,500 psi to the test unit. Open the supply
valve on the nitrogen bottle and adjust the bottle regulator to 1,500 psi.
5.
Remove the console’s rear panel.
Bleed off pressure before tightening fittings by turning off the bottle
and opening the nitrogen vent valve.
6. Slowly open the nitrogen supply valve on the front of the instrument and
observe all fittings and tubing for leaks.
7. If no leaks are heard or observed on pressure gauge, slowly open the paddle cap
valve. If leaks are present, the 1500 psi reading will drop. Locate the leaks.
8. Unlock and rotate the heating jacket and pressure chamber 180 degrees, then re-
lock.
9. Turn rotating shaft by hand with wrench to loosen seal drag.
10. Attach the flexible rotating shaft coupling to the motor and sample chamber
assembly paddle, but do not run flex shaft nut all the way up.
11. Turn the stirring motor to the on position. The shaft will rotate. Tighten the
nuts and operate for 10 minutes.
12. Observe that the motor and shaft run smoothly, free of excessive noise, or
change in the noise level. Check for leaks as evidenced by water on the flex
shaft. Turn the stirring motor off.