position and allow the mercury to rise into the capillary of its own accord. DO
NOT TOUCH THE BULB WITH YOUR HANDS!
If you are unsuccessful repeat the cooling method except this time
gently tap (do not bounce) the thermometer bulb vertically on a desk pad after
removing from the flask.
NOTE: Where possible, thermometers should be stored in a vertical
position.
Pneumatic Lift Troubleshooting
WIRE TO
M I
P2-1 ,P2-3
FIGURE B
Pneumatic Lift maintenance
1.) The pneumatic lift system requires 60 to 80 psi for proper
operation. Please verify that your shop air meets these requirements.
2.) Clean out the in-line water filter.
3.) Verify that the unit is level and that the guide rod is not bent, see fig. C.
4.) Confirm that the hold valve switch is in the HOLD OFF position. See
figure A.
5.) If there is still no response please follow these procedures:
a.) Verify that the solenoid is getting the proper voltage. See fig. B.
Remove the solenoid electrical connector with a regular screwdriver.
Remove housing. Connect one lead of the DC voltmeter to chassis
ground and the other lead to either solenoid connectors. Enter the
solenoid cycle in the SYS, TEST mode. Measure the DC
voltage to each connection. Voltages should be a constant +4 to +5 volts or
greater on one connector and should switch from +4 to +5 volts (UP) to less
than +1 volt (DOWN) on the other connector. If these conditions are not met,
call Dynisco Polymer Test Systems tech support. If voltages are OK, proceed.
b.) Reassemble the solenoid and reenter the solenoid cycle. While the lift is
cycling, listen for the manifold to open and close; it's usually pretty noisy. If it
does not open and close, then listen if the solenoid clicks. If the Solenoid clicks
then the manifold is probably bad, if the solenoid does not click, then the
solenoid is probably bad. Call Dynisco Polymer Test tech support to order
replacement parts.
The guide rod and the pneumatic cylinder rod can be lubricated. Dynisco
Polymer Test suggests that WD-40 or machining oil be used as a lubricant. You
can also spray a small amount of WD-40 into the manifold to lubricate all
internal parts.
Series 4000 Melt Indexer Operation Manual Instrument Maintenance and Troubleshooting
67
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