Specifications

RUSKA 7250, 7250i, 7250xi & 7250LP

Users Manual

4-8

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 7250.

Step/Jog

In addition to entering the pressure set-point through the key-pad, the pressure set-point

can be changed using either the step or the jog functions. The Step function is used

primarily when the operator is taking pressure steps in equal pressure increments. The

size of the pressure step is user defined. The Jog function is most often used when

calibrating mechanical gauges such as a dial gauge and the operator wishes to change the

pressure until the mechanical gauge indicates a cardinal point. The operator can then read

the higher resolution Calibrator to determine the actual pressure value when the

mechanical gauge is indicating a cardinal point. The Step/Jog [F5] toggles between Step

and Jog, to switch between these modes, press the function key 5 [F5].

Stepping

Assure that the word Step is highlighted in the Step/Jog [F5]. Using the rotary knob,

rotate the knob clock-wise to increase the set-point, or counter clock-wise to decrease the

controller set-point. The scratchpad will be updated to a new set-point. The step size

defaults to 10% of full scale. Press ENTER to accept the new set-point.

Setting Step Size

From the Main Menu, press Menu [F6] | Setup [F2 | User [F2]. Using the rotary knob,

move the cursor to highlight Step Size. Enter the desired step size in the current pressure

units and press ENTER.

Jogging

Assure that the word Jog is highlighted in the Step/Jog [F5]. From the Main Menu, the

pressure set-point can be modified by rotating the rotary knob clockwise to increase

pressure and counter-clockwise to decrease pressure. Each increment or decrement will

change the pressure in the least significant digit. Continually rotating the rotary knob, the

pressure will continue to change until the rotation is stopped.

The Menu key is used to access the less commonly accessed configuration type functions.

This accesses the Setup, Calibration, Program, Test and Display functions.