Front Panel Operation:
The 9424 powers up into the default
operating screen in the default mode of
measure and with the control set point
equal to the first pressure measured.
The screen is subdivided into functional
sections. The top row identifies the
instrument type. On the far right is the
numeric keypad, below the keypad are
the control jog functions, and below the
jog functions are the toggle buttons for
the external control signals. On the far
left of the screen is a large window
displaying the control set point value
near the top and the current measured
pressure reading below the set point value. The measured pressure reading also acts as
the pressure stable indicator. The reading is green if the pressure is stable and yellow if
the pressure is driving to a new control point. Below this window are 6 buttons labeled
Meas Mode, Ctrl Mode, Vent Mode, Unit Chg, Setup Scrn, and Edit Setup. The first
three buttons change the mode of operation from measure to control to vent. The Unit
change button brings up 4 menus of pressure units that can be selected. Pressing one of
the unit buttons immediately changes the set point value and the reading value to the new
units of measure. On initial power-up, the setup/status window is normally displayed
below the 6 buttons. The window can be called up if the SETUP SCRN, or EDIT
SETUP button is pressed. This window displays the model, serial number, pressure
range, stable window(stable tolerance), jog values, and transducer zero and span.
Keypad Entry Function:
The keypad (light blue in color)
normally found on the right side of
the screen is used for multiple
numeric data entries. Normally at
power up and whenever the set
point window is pressed, the
keypad is used for entering a
control set point value. This is
designated at the top of the keypad
with the word “SETPT:”. As
numeric values are entered they are
displayed in the window next to
“SETPT:”. The ‘CE’ key can be
used to clear the last keystroke and the ‘X’ key deletes the entire entry. Once the correct
value is entered, the ‘=’ key is used to accept the value and display it in the actual
