DH Instruments PPCK PLUS, Operation And Maintenance Manual

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PPCK+™ Operation and Maintenance Manual
Page 19
©2001 DH Instruments, Inc .
Pressing [ENTER] within a menu or function generally causes execution or forward
movement in the menu tree. Pressing [ENTER] from the main run screen allows an
automated pressure control command to be given.
Pressing [ESCAPE] moves back in the menu tree and/or causes execution to cease
or suspend. Pressing [ESCAPE] repeatedly eventually brings you back to the main
run screen and from there will allow a momentary viewing of the PPCK+
introduction screen.
Pressing [+/-] changes a numerical sign when editing. It also toggles through
multiple screens when available.
Pressing [
←
] or [
→
] allows reverse or forward cursor movement when editing
data entry. These keys also allow the target pressure value to be jogged up and
down while controlling or when editing the target value.
Some screens go beyond the two lines provided by the display. This is indicated by a
flashing arrow in the second line of the display. Press the [ ← ] and [ → ] keys to move
the cursor to access the lines that are not visible or directly enter the number of the
hidden menu choice if you know it.
3.1.2.2 MANUAL PRESSURE CONTROL KEYS
The manual pressure control keys provide direct operator control of pressure
increase, decrease and vent. They can be useful in adjusting pressure when
automated pressure control to a target value is not needed.
The manual pressure control keys interrupt and override automated pressure control.
Pressing the [VENT] key causes PPCK+ to execute its vent routine in which
pressure is controlled to near atmospheric pressure and then the exhaust valve is
fully opened. A RED LED just above the
[VENT] key indicates the PPCK+ is in vent
mode. The vent valve will remain open until the [VENT] key is pressed again,
another manual pressure control key is pressed, or an automated pressure control
command is given.
Pressing [
↑
] or [
↓
] causes pressure to increase or decrease at the slow slew rate.
These are momentary keys that are active only as long as they are pressed.
Releasing the key stops the pressure increase or decrease.
Pressing and holding the [FAST] key while pressing the [
↑
] or [
↓
] causes the
pressure increase or decrease speed to change from slow to fast.
Figure 4. Manual Pressure Control Keys