Fluke RUSKA 7252, User Manual

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RUSKA 7252
Users Manual
4-8
Note
For Calibrator’s with pressure ranges greater than 100 psi (700 kPa), the
supply pressure port must be plugged or connected to a properly set
pressure supply in order to measure pressure greater than 100 psi
(700 kPa).
Controlling Pressure
The
Control
[
F2
] function key is used to place the Calibrator into the Control Mode. A
pressure set-point should be entered into the Calibrator prior to placing the unit into the
control mode. This is to assure that the operator is aware of the set-point valve prior to
entering into the control mode.
Setting the Pressure Set-Point
The pressure set-point is the destination of the pressure control algorithm. It should be set
before entering Control mode. The pressure set-point is set to zero at power-up or
whenever a pressure error occurs.
1.
The pressure set-point can be set from the dual display menu or the Main Menu of
the single channel mode. (On the dual channel display mode, use the rotary knob to
select which channels set-point is being edited.)
2. Use the numeric keypad to enter the new pressure set-point in the current pressure
units.
3. Press ENTER to accept the entry or press CLEAR to clear the numeric scratchpad.
Note
The set-point can also be changed using either the Step or the Jog function.
See Chapter 6, Step/Jog.
Entering/Exiting Control Mode
1. The Control mode is set from the Main Menu . (Press PREVIOUS until the Main
Menu appears.)
2. Press Control [ F2 ] to enter Control mode. ENTER must be pressed to confirm entry
into Control mode.
Note
Any entry in the numeric scratchpad will also be taken as the new pressure
set-point.
3. Press MEASURE key found in the keypad to exit Control mode. No confirmation is
necessary.
Vent
The Vent [ F3 ] function is used to rapidly vent the pressure in the system to atmosphere.
This system does not have a designated internal vent valve. Instead, the vent mode is
implemented with a fast multi-step procedure. For gauge instruments, the Calibrator
controls pressure at the maximum rate towards zero psig. When the primary sensor reads
that the pressure is within 1% FS pressure of zero psig, the controller is turned off and the
zero solenoid valve that ties the reference port to the test port is opened. This physically
vents the test port to atmosphere. If the Calibrator is at a sub-atmospheric pressure, then
the system will control to zero psig, at maximum rate, turn off the controller, and open
the zeroing solenoid valve, again venting the test port to atmosphere. This function is not
available on permanent absolute versions of the RUSKA 7252.