Cannon Instrument CAV-2000 - Manual (Page 86)

CANNON ® Automatic Viscometer Models CAV-2100 and CAV-2200 with VISCPRO ® Instruction & Operation Manual
Version 2g — May, 2009; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
80
Regulating pneumatic pressure
To regulate pressure to the pneumatics, including the sample vial eleva-
tion apparatus (LOAD) and tray advancement mechanism, use the control
opposite the MAIN AIR dial indicator. Turn the control clockwise to
increase pressure and/or counterclockwise to reduce it.
Regulating solvent flow
To regulate solvent flow, use the control opposite the MSOLV dial
indicator on the CSU-200. Turn the control clockwise to increase pres-
sure and/or counterclockwise to reduce it.
Regulating vacuum
To regulate vacuum to the capillary tubes, use the control opposite the
VACUUM dial indicator. Turn the control clockwise to increase vacuum
and/or counterclockwise to reduce it.
Adjusting pneumatic controls
Pneumatic controls are adjusted from the CAV drawer at the bottom of
the Bath Unit. A key is required for access to service controls through the
hinged front panel. These controls are normally set during installation
and seldom require adjustment.
CAV service drawer controls
The NVIS regulator (NVIS gauge) regulates the compressed air/nitrogen
supply used to dry the viscometer tubes. The pressure should be set
between 20-30 psi. Pull the control knob out, then rotate the knob to
adjust the pressure setting. When done, push the knob in to lock at the
desired setting.
Pneumatics for both viscometer tubes have four corresponding controls
(ADVANCE, AIR RETURN, LOAD and SHIFT) located on the inner
service drawer panel of the CAV. These controls adjust the air pressure
used to regulate the speed at which the mechanisms move. The following
table provides an explanation of the function of each panel control: