VICI 450 Dynacalibrator - Manual (Page 18)

14
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 indicator
lights when main power is on. To reset the circuit breaker, press in on the white
tab on the front of the breaker.
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. To
reset the circuit breaker, press in on the white tab on the front of the breaker.
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 writ-
ten to memory so that after a power failure the unit will return to the condition
previously established.
DILUTION FLOW CONTROL VALVES
• Turn the SPAN 1 knob to adjust the flow rate of the SPAN 1 dilution stream
for zero air output or mixing with carrier and trace gas.
• Turn the SPAN 2 knob to adjust the flow rate of the SPAN 2 dilution stream
prior to its mixing with carrier and trace gas.
DILUTION FLOWMETERS
The two ball floats and gauges indicate the relative SPAN 1 and SPAN 2 dilution
stream flow rates, as set by the respective dilution flow control knobs. Factory
calibrated flow rates at integral float settings are provided at the rear of the
manual.
OVEN TEMPERATURE LIMIT THERMOSTAT
This thermostat setting provides a safety shutoff at a user-defined setpoint. The set
point should be 5 - 10 degrees above the normal run temperature of the perme-
ation device in use. If the oven runs out of control, this thermostat will shut down
the oven heat and give a “PFAIL” indication in the temperature display window.
Getting Started