User manual FLUKE MOLBOX RFM

[. . . ] Operation and Maintenance Manual molboxTM RFMTM (Ver 1. 10 and Higher) Reference Flow Monitor © 1998-2007 DH Instruments, a Fluke Company 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. © 1998 - 2007 DH Instruments, a Fluke Company All rights reserved. Information in this document is subject to change without notice. [. . . ] PRINCIPLE/OPERATION See Section 3. 4. 3. 5. © 1998-2007 DH Instruments, a Fluke Company Page 72 3. OPERATION 3. 5. 2 <2presU> PURPOSE To select/change the unit of measure in which molbox RFM displays pressure values. OPERATION To set the unit of measure in which molbox RFM displays pressure values, press [SETUP] and select <2presU>. The display is: Pressure unit type: 1SI 2other 3user Select the unit type desired, then select the unit desired. After the unit selection, operation returns to the previous run screen with the selected pressure unit of measure active. The pressure units of measure available are listed in Table 15. Table 15. Pressure Units of Measure Available <1SI> <1Pa> <2kPa> <3mPa> <4mbar> <5bar> <6mmHg> <7mmWa> *3User: User defined unit. <2Other> <1psi> <2psf> <3inHg> <4inWa> <5kcm2> <3User>* <1user> The "user" unit is defined in terms of user units/Pa when the user unit is selected. See Section 7. 1. 1 for definition of the pressure unit conversions used by molbox RFM. 3. 5. 3 <3tempU> PURPOSE To select the unit of measure in which molbox RFM displays temperature values. OPERATION To set the unit of measure in which molbox RFM displays temperature values, press [SETUP] and select <3tempU>. The display is: Temperature unit: 1celcius 2fahrenheit Select the desired unit. After the unit selection, operation returns to the run screen with the selected temperature unit active. See Section 7. 1. 2 for definition of the temperature unit conversions used by molbox RFM. Page 73 © 1998-2007 DH Instruments, a Fluke Company molboxTM RFMTM OPERATION AND MAINTENANCE MANUAL 3. 5. 4 <4MOLBLOC> PURPOSE To initialize a molbloc when it is connected to molbox RFM and/or to identify the molbloc currently connected to molbox RFM. To determine the gases with which the molbloc has been calibrated. PRINCIPLE molbox uses molbloc specific calibration information contained in the molbloc's EEPROM to determine whether it should operate in molbloc-L or molbloc-S mode and in its calculation of flow through the molbloc. For the molbox RFM to correctly calculate the flow through the molbloc, it must use the specific information for the molbloc that is currently connected. molbloc EEPROM information is read and stored by molbox RFM in the molbox power up sequence when it is turned on, or by selecting [SETUP], <4molbloc>. The <4molbloc> function may be used any time there is a change in the molbloc connected to a channel to assure that molbox RFM uses the correct molbloc information on subsequent measurements. The <4molbloc> function can also be used to display identifying information on the molbloc currently connected to the molbox RFM and to determine the gases with which the molbloc has been calibrated. OPERATION To access the molbloc function, press [SETUP], and <4molbloc>. Operation is similar to operation of the [molbloc] direct function key (see Section 3. 4. 8). However, when in the molbloc identification screen, pressing [ENTER] causes a list of the gases for which the molbloc has specific calibration coefficients to be displayed. The gases are listed using their chemical abbreviationsError!After viewing, press [ESCAPE] to return to the current run screen. 3. 5. 5 <5STAB> PURPOSE To change the stability limit that serves as the criterion for the flow Ready/Not Ready indication (see Section 3. 1. 3). [. . . ] The element used in molblocs to measure Critical flow Clean Deviation Differential Downstream DUT FA (Flow Adder) FM (Flow Multiplier) Freeze Full Mod Calibration FS Gauge Head Hi/Lo K Factor Microrange Operating Pressure PA (Pressure Adder) Perfect Mass Flow Units PM (Pressure Multiplier) Process Gas PRT Psia Psig Pressure unit "pounds per square inch absolute". Pressure unit "pounds per square inch gauge". Pressure expressed relative to atmospheric pressure. Page 161 © 1998-2007 DH Instruments, a Fluke Company molboxTM RFMTM OPERATION AND MAINTENANCE MANUAL Rate Ready/Not Ready Reynolds Number A DISPLAY function in which the current rate of change of the flow in flow units/second is displayed. Indication of when flow is stable within the stability limit and below the flow Reynolds number limit. [. . . ]