Download AS40 Autosampler Manual

AS40 Automated Sampler
17. Tighten each pressure bolt fingertight, then use an open end
wrench to tighten an additional one-eighth turn.
NOTE
For optimum operation, all eight pressure bolts must be evenly
tightened against the slider. For optimum leak-free operation, a
torque wrench may be used to evenly tighten the pressure bolts
to the recommended 0.56 to 0.71 N-m (80 to 100 in-oz).
Overtightening may break off the bolt in the valve body.
18. Reset Default Set switch #10 to the Run position.
19. See Section 5.4 if cleaning the valve slider does not eliminate
the backpressure problem.
5.4 Replacing a Damaged Port Face
A scratched port face may cause a leak around the pressure bolt
of the bleed valve. A plugged port face will cause excessive
backpressure.
1. Place the sampler on its left side, exposing the bleed valve in its
compartment in the right front corner of the AS40 chassis. The
bleed valve is accessible only from the bottom of the AS40.
Remove the valve from its mounting clips for access to the valve
components.
2. Remove the bleed valve from its clip mount for easy access to
all of the ports.
3. Disconnect the tube fitting from the suspect pressure bolt (see
Figure 5-3), then unscrew the pressure bolt from the valve body.
5-8
Doc. 034970-02 6/94