VICI 500 Dynacalibrator - Manual (Page 16)


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 17). 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
Turning the knob on the Dilution Flow Control Valve clockwise will increase the
diluent flow that will mix with any selected carrier flow. If neither Span 1 nor
Span 2 are selected, this flow will act as a Zero gas at the SPAN OUTLET.
DILUTION FLOWMETER
The ball floats and gauge indicate the dilution stream flow rate, and are con-
trolled 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.
CHAMBER switches and indicators
Series 500 Dynacalibrators have two permeation chambers. Each chamber has a
switch which places the chamber in line with the diluent stream, and two indica-
tors to provide visual confirmation of the switch setting. Each chamber is func-
tionally independent, so that the user can select either, both, or neither chamber
to be in line with the diluent stream. These options allow four possible settings:
• ZERO, or CHAMBER 1 VENT/CHAMBER 2 VENT: Zero is effectively enabled
when neither chamber is selected; only the diluent stream passes through
the SPAN OUTLET. Use this setting to make sure there are no residuals in the
output stream.
• CHAMBER 1 SPAN/CHAMBER 2 VENT: With Chamber 1 set to SPAN, the carrier
flow from Chamber 1 is mixed with the diluent flow set by the Dilution Flow
Control Valve. This combined flow is dispensed through the SPAN OUTLET
port on the back panel. Increasing diluent flow decreases the concentration
delivered; decreasing diluent flow increases the delivered concentration. In
this setting, Chamber 2 carrier is vented and does not mix with the diluent.
• CHAMBER 2 SPAN/CHAMBER 1 VENT: With Chamber 2 set to SPAN, the carrier
flow from Chamber 2 is mixed with the diluent flow set by the Dilution Flow
Control Valve. This combined flow is dispensed through the SPAN OUTLET
port on the back panel. Increasing diluent flow decreases the concentration
delivered; decreasing diluent flow increases the delivered concentration. In
this setting, chamber 1 carrier is vented and does not mix with the diluent.
• CHAMBER 1 SPAN/CHAMBER 2 SPAN: With Chambers 1 and 2 both set to
SPAN, Carrier 1 and Carrier 2 are both mixed with the diluent flow controlled
by the Dilution Flow Control Valve. The combined total flows of Carrier 1,
Carrier 2, and Dilution Flow are distributed to the SPAN OUTLET port on the
rear panel. The total flows of all three streams must be used for an accurate
calculation of the delivered concentration.
Getting Started