Thunder Scientific 2500 series, Руководство по эксплуатации и обслуживанию

Страница: 41 / 117

3-5
3.2.4 Changing Units
The generator can operate in a variety of user selectable pressure, temperature, and flow
units.
To change units from the main control screen:
A) Press the [CHNG UNIT] key. The menu labels change to indicate the currently selected
pressure, temperature, and flow units.
B) Press [PRES] to select from psi (pounds per square inch), "Hg (inches of mercury), Tor
(Torr), bar (bars), mbar (millibars), and kPa (kilopascals) units of pressure.
C) Press [TEMP] to select from °C (degrees centigrade) and °F (degrees fahrenheit) units of
temperature.
D) Press [FLOW] to select from L/min (liters per minute), L/h (liters per hour), cfm (cubic
feet per minute), and cfh (cubic feet per hour) units of flow.
E) Press <ENTER>to return to the main control screen.
3.2.5 Control Modes
The generator has the ability to control the humidity in one of three possible modes.
Mode 1) %RH @Pc is held constant even under varying conditions of saturation
and chamber temperature. The saturation pressure tracks at a fixed
ratio above the chamber pressure. %RH @PcTc and SATUR xxx
setpoints vary under computer control.
Mode 2) %RH @PcTc is held constant by varying saturation pressure to
compensate for changes in chamber (barometric) pressure, and
differences between the saturation and chamber temperatures. This is
considered to be the most accurate RH calculation. %RH @Pc and
SATUR xxx setpoints vary under computer control.
Mode 3) SATUR xxx (saturation pressure) is controlled at a constant value
independent of chamber pressure, chamber temperature, or saturation
temperature. %RH @Pc and %RH @PcTc setpoints vary under
computer control.
SetPnt Actual
%RH @Pc 50.25
*%RH @PcTc 50.00
SATUR Psi
29.40
CHMBR Psi
SATUR
o
C 25.00
CHMBR
o
C
FLOW l/m
20.00
PRES
Psi
TEMP
o
C
FLOW
l/m