User manual FLUKE MFC SWITCHBOX

[. . . ] MFC SwitchboxTM User's Manual © 1997-2008 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. © 1997-2008 DH Instruments, a Fluke Company All rights reserved. Information in this document is subject to change without notice. [. . . ] After entering the MFC range, you will be prompted to enter the device type. The device type for any voltage based profile can be either `measure' or `control'. If the profile indicates measure, then channel one will be used for control whenever the channel is selected that is associated with this profile. If the profile indicates control, then the selected channel will be used for both measurement and control. When calibrating MFMs, the range of the MFC setup for channel 1 must be wide enough to cover the range of all the MFMs being calibrated on the other channels. For details on configuring the MFC channels and profiles see the molbox1 or MFC-CB Operation and Maintenance Manual. Once the MFC channels have been configured using the setup menu, the MFC channel can be selected by pressing the MFC function key on the molbox1 or MFC-CB front panel. When the MFC function key is first pressed the screen prompts the operator to select the MFC channel (<0> disables). The MFC Switchbox must be connected to the molbox1 or MFC-CB at the time of this selection, but does not have to be connected during the MFC setup described above. Entering <1>, <2>, <3>, <4> or <5> selects the corresponding channel on the MFC Switchbox and enables the MFC function. When not using the MFC Switchbox, select Channel #1 when activating the MFC function. The operator is then prompted to select the MFC profile. The profile number that is associated with the selected channel is automatically displayed. This screen allows the operator to override the profile selection made during setup. The number refers to the profile number. When the profile number desired is entered a summary of the profile is displayed. When [ENTER] is pressed again, the display returns to the main run screen and the MFC function is active using the MFC profile selected. The MFC Switchbox must be connected to the molbox1 prior to pressing [ENTER] or the message that actually triggers the switching inside the MFC Switchbox will be missed. With molbox1, the text <MFCn> or <MFMn> (where n is the channel number and the type depends on the channel configuration) will be displayed in the bottom right hand corner of the main run screen. With MFC-CB, the text <Dn, c> (where n is the number of the active MFC-CB channel and c is the number of the active MFC Switchbox channel. When the MFC function is active, pressing [ENTER] from the main run screen or an MFC run screen allows entry and execution of the MFC setpoint command. Page 7 © 1997-2008 DH Instruments, a Fluke Company MFC SWITCHBOX USER'S MANUAL When the selected channel is associated with a `measure' profile type, the control signal is sent to the device on channel 1. This setpoint must be set in voltage and will set flows according to the range specified in the profile for the device connected to channel 1. The measurements will be taken from the selected channel using the profile associated with the selected channel to define the flow value. If the profile for channel 1 indicates a current based MFC, then attempting to select a channel with a `measure' profile type will result in the error message <Voltage mode needed on channel 1 control>. Pressing the [ð] arrow key any time the MFC control function is active causes an instant display of the current MFC profile summary allowing a quick check of the characteristics of the currently active MFC profile. [. . . ] Troubleshooting Checklist SYMPTOM PROBABLE CAUSE MFC control cable not connected between the switchbox and the MFC, or it is incorrectly connected. The MFC Switchbox is not correctly connected to the molbox1. SOLUTION Check the MFC Cable connections. MFC doesn't appear to be responding when the MFC Switchbox is used. MFC doesn't appear to be responding when the MFC Switchbox is used. [. . . ]