3. OPERATION
Page 25 © 1998 DH Instruments, Inc.
OPERATION
To change the pressure unit of measure, press the
UNIT function key. The display is:
1psi 2kPa 3inHg
4inWa 5mmHg 6ft
Select the desired pressure unit. ENTER selects the unit and goes to measurement mode
selection: 1gauge or 2absolute. Making the selection returns to the main run screen with the
selected measurement unit and mode active.
If the pressure unit selected is inWa the reference
temperature for water density must be specified.
When inWa is selected as the unit, the next display is:
Select inWa ref temp
4ºC 20ºC 60ºF
Select the desired reference temperature for water density using the
← or → key to move
the cursor. ENTER returns to the main run screen with the inWa based on water density at
the selected reference temperature as the pressure unit. The current inWa reference
temperature can be viewed by observing the position of the cursor in the reference
temperature screen.
No reference temperature selection is necessary for the unit mmWa as the only reference
temperature commonly used for mmWa is 4º C.
See Section 9.3 for tables of the conversion factors used by PPC2 AF.
The choice of six units available under the UNIT function can be modified from a wider
selection by the user. See Section 3.4.1.
3.2.3 CONTROL
PURPOSE
To set the automated pressure control mode for the currently active range with default control
parameters.
PRINCIPLE
The CONTROL function allows the active control mode for the current range to be set to
either static control or dynamic control (see Section 3.1.2.3). The control mode set is specific
to the current range and will be maintained with that range when ranges are changed.
When the control mode is set using the CONTROL function, CONTROL parameters are set
to system default parameters which have been determined to be those most suitable for the
typical user to operate within PPC2 AF pressure control and measurement specifications
(see SYSTEM DEFAULT CONTROL PARAMETERS below). If desired, control mode
parameters can be customized by the user using the CUSTOM CONTROL function
(see Section 3.2.6).
For a complete description of the operation and purpose of static and dynamic control modes,
see Section 3.1.2.3.
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