VICI 340 Dynacalibrator - Manual (Page 16)

12
Front Panel Controls and Indicators
The section entitled “Advanced Theory of Operation” beginning on page 27
includes more detailed information on the interrelation of the front-panel
controls and indicators with the internal pneumatic and electrical flow of
the units.
MAIN POWER switch, indicator, and circuit breaker
The push-button switch provides primary power to all circuits. The LED indica-
tor lights when main power is on. A 6 amp circuit breaker is installed in the main
primary power input line to all circuits.
HEATER POWER switch, indicator, and circuit breaker
The push-button switch provides primary power to the heater circuits when
the main power switch is on. The LED indicator lights when heater power is on.
A 4 amp circuit breaker is installed in the primary power line to the permeation
chamber heater circuits.
PERMEATION CHAMBER
This is the chamber which holds the permeation devices. A tool is provided to
rotate the panel lock screw 90° counterclockwise to unlock the cap.
PERMEATION CHAMBER FLOWMETER
A ball float and gauge in the carrier stream immediately pre ceding the chamber
indicates relative carrier flow. The actual carrier flow is set at the factory. Refer to
the calibration sheet at the back of the manual.
TEMPERATURE READOUT AND CONTROLLER
The front panel displays the current chamber temperature and the control
status of the instrument, indicated by the PNL and TMP lights. The chamber
temperature can be set manually through the controls on the front panel or
remotely through RS-232 communication. (Refer to the chapter entitled “Serial
Port Communications” on page 20). After a temperature set point is entered by
either method, it is written to memory so that after a power failure the unit will
return to the condition previously established.
DILUTION FLOW CONTROL VALVE
Turn the knob to adjust the flow rate of the dilution stream prior to mixing with
carrier and trace gas.
DILUTION FLOWMETER
The ball float and gauge indicate the relative dilution stream flow rate into the
mixing tee, as set by the dilution flow control knob. Factory calibrated flow rates
at integral float settings are provided at the rear of the manual.
OVEN TEMPERATURE UPPER LIMIT
A thermostat provides a safety shutoff at this user-defined setpoint, usually
5 - 10 degrees above the normal run temperature of the permeation device in
use. If the oven runs out of control and the temperature goes above this setting,
power to the oven heater is shut down and a “PFAIL” indication appears in the
temperature display window.
Getting Started