User manual DHI PPC4E

[. . . ] PPC4E Pressure Controller/Calibrator Operation and Maintenance Manual © 2010 Fluke Calibration Warning · High pressure liquids and gases are potentially hazardous. Energy stored in these liquids and gases can be released unexpectedly and with extreme force. High pressure systems should be assembled and operated only by personnel who have been instructed in proper safety practices. If there is any doubt as to the effectiveness of the supply outlet earth, do not connect the PPC4E. [. . . ] [Reset] to erase the list of Favorites, [Back] to return to <Pressure>, [Esc] or exit to the Main Run Screen without making a change. 4. 7. 6. 1. 2 All Units If the desired unit has not been used recently and is not in the Favorites list, then <All Units> can be selected. First Enter the scrolling list then scroll through and Select the desired unit of measure. or Enter to select, to exit the menu. Note Units representing a water column (inches/meters/millimeters of Water) are all represented with a selection of temperatures from which to calculated density. [Back] to return to the <Pressure> tab, [Esc] or exit to the Main Run Screen without making a change. 4. 7. 6. 1. 3 User Units If a unit of measure is needed that is not among the predefined units then up to five user defined units may be created. To create a user defined unit first the conversion from the new unit to Pascal (Pa) must be specified. In order to edit a user defined unit, select [Settings], <Pressure>, Pressure Unit, <User Units>. To edit the name using the text editing screen, Select and Enter the Unit Name field. Selecting and Entering a letter allows brings up the character drop down list. [OK] to accept and return to the Unit edit screen, [Back] to reject changes and return to the Unit edit screen, [Esc] or to reject changes and exit to the Main Run Screen. Enter the appropriate value for the number of Units/Pa in the second field of the User Defined unit screen. For example, the unit kiloPascal (kPa) would have Units/Pa equal to 0. 001. [OK] to accept and return to the Main Run Screen, [Back] to reject changes and return to the <User Units> tab, [Esc] or exit to the Main Run Screen without making a change. 4. 7. 6. 2 Measurement Mode PURPOSE To set the measurement mode (absolute, gauge or negative gauge) for the active range (see Section 3. 2. 10). OPERATION [Settings], <Pressure>, Measurement Mode brings up the Measurement Mode screen with the available mode selections. The shortcut to Measurement Mode is the measurement mode field from the Main Run Screen (see Figure 7). Select and Enter to change the selected mode and return to the Main Run Screen with the new mode active. Page 63 © 2010 Fluke Calibration PPC4TM OPERATION AND MAINTENANCE MANUAL If an Axxx RPT or a utility sensor is active, all thee measurement modes are supported: absolute, gauge and negative gauge. If absolute and negative gauge modes are OFF then only gauge mode is available. [Esc] or to return to the Main Run Screen without making a change. Note Absolute and negative gauge modes on an Axxx RPT can be turned OFF in the calibration function (see Section 6. 2. 5). When absolute and negative gauge modes are turned OFF for an Axxx RPT, only gauge mode can be activated. 4. 7. 6. 3 Head PURPOSE To cause a pressure fluid head correction to be added or subtracted to the pressure measured by the PPC4E reference pressure transducer in order to predict the pressure at a height other than the PPC4E's reference level (see Section 3. 2. 15). Note Use of the Head function to ensure in tolerance measurements is most important in low absolute pressure ranges. (7. 5 cm) is adequate to ensure that, even in the worst case, the uncertainty on the head correction will be insignificant relative to the tolerance on the measurement. In this screen edit: Height: The height of the UUT or measured pressure above the reference level of the PPC4. The reference height of the PPC4E pressure measurement is the middle of the PPC4E TEST port. The head height should be entered as a positive value if the device or system under test is higher than the PPC4E and negative if it is lower. [. . . ] The device or devices pneumatically connected to the PPC4E TEST port that the PPC4E is being used to test or calibrate. (see also UUT) Control mode in which the pressure is constantly adjusted to remain as close as possible to the target value. The full scale value is the maximum pressure or the span of a measurement range. Measurement mode in which the PPC4E indicates gauge pressure (difference from atmospheric pressure), but only in the positive direction (above atmosphere). [. . . ]