PPC2+™ Operation and Maintenance Manual
Page 17
©2001 DH Instruments, Inc.
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3 . 1 G E N E R A L / M A N U A L O P E R A T I O N
PPC2+ is designed to offer a balance between simple, straight forward operation and the
availability of a wide variety of functions with a high level of operator discretion, if desired.
The local operator interface is through a 2 x 20 display, a 4 x 4 keypad and four direct pressure
control keys.
3.1.1
MAIN RUN SCREEN
The PPC2+ main run screen is its home display that is reached on power-up and from which
other functions and menus are accessed. It is the very top level of all menu structures.
The main run screen is where the operator works with PPC2+ to set and read pressures.
It provides complete information on the system’s current configuration and operating status.
1. Ready/Not Ready Indication (see Section 3.1.2.4):
<*> when ready, <
↑
> or <
↓
> indicating direction of
measured pressure evolution if not ready.
2. PRESSURE1: Numerical value and sign of pressure
measured by active RPT and range.
3. UNIT Current unit of measure of pressure indication (see
Section 3.2.2).
4. <M> Pressure measurement mode: <g> gauge,
<a> absolute (see Section 3.2.2).
5. Indicates whether a head correction is applied. <h> if
applied, < > (blank) if not (see Section 3.2.7).
6. Indicates whether the autozero function is ON or OFF. <z> if ON; < > (blank) if OFF (see
Section 3.4.1).
7. SR: Indicates active RPT (<H> for high, <L> for low) and range (<1> = low, <2> = mid, <3> = hi)
(see Section 3.2.1).
8. Used only when running a sequence. Indicates number of current increment over total number of
increments in the sequence or [ENTER] when ready. Changes to countdown time during count
down when next increment of sequence is on timed delay rather than enter.
9. Pressure control mode (<S> for static, <D> for dynamic) with a <C> appended if custom control
settings are in use. These control indicator characters flash when the system is controlling.
In static mode, if control is active they flash even if NO valve is operating (e.g., while inside the
hold limit and waiting for stability). Characters flash while controlling pressure down to vent but
NOT when vent valve is open (see Sections 3.2.3 and 3.2.6).
10. PRESSURE2: Numerical sign and value of either target pressure <T>, rate of change of pressure
<R> or deviation from target <D>. Target value and deviation are in the same pressure unit as the
current unit in Step 3 of this section. Rate of change of pressure is in current unit per second (see
Section 3.2.3).
2
3
7
TPRESSURE2 CC NN/NN
7
Summary of Contents for PPC2+
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