Baker Hughes Masoneilan 12400 Series Instruction Manual & Safety Manual

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Baker Hughes Masoneilan 12400 Series Instruction Manual & Safety Manual Manual pdf 22 page image

20 | BHGE ® 2017 Baker Hughes, a GE company. All rights reserved.6. Operating the instrument6.1. GENERAL PRINCIPLESAll digital settings of the 12400 instrument are made by means of three pushbuttons and a liquid crystal display on the front ofthe instrument, or using HART communication handheld terminals or BHGE’s Masoneilan software: ValVue*, ValVue AMS* Snap-on and ValVue PRM*. Instrument settings can also be performed with any software compliant with FDT/DTM protocol.The codes or values displayed by the LCD can be seen through a window on the main cover. Access to the three pushbuttonsis obtained by opening the cover (255). It is not necessary to open the main cover for calibration or adjustment of the instrument.Except for maintenance and out of hazardous area, the cover must remain closed.6.1.1. THE LIQUID CRYSTAL DISPLAY (LCD)The LCD displays simultaneously two lines of nine ASCII characters and one line of seven digital characters.The display is also used to configure, calibrate and diagnose the 12400 instrument.For ease of operations, values, codes or short names appear on the display. The various parameters are listed in the menus(see Appendixes A, B, C, D, E, F and G).6.1.2. PUSHBUTTONSThree pushbuttons (260) are located behind the cover (255) on the front of the instrument. The left button is marked with a star , the middle button with the sign –, and the right one with the sign +. means enter the function, accept or save to memory. It may be understood as "YES". + or – means vertical movement in the program structure. It may be understood by "NO" or "NEXT" or "PREVIOUS".NOTE: Do not over push on the buttons. Press a button at least one second to perform the action. Accidental pushing of any of the buttons will not cause any malfunction.After using the buttons, check instrument is in back to NORMAL mode, which displays in sequence the current signal and thelevel of liquid. Close the cover (255).6.1.3. OPERATING MODESThe instrument can operate under three modes with associated menus: NORMAL Mode: It is the normal operating mode. As a level transmitter, the 4-20 mA output signal (AO_1) is proportional tothe level in the tank. As a level controller, the 4-20 mA output signal (AO_1) is the controller output. The local digital displayalternately displays loop current and level expressed in the unit (% or engineering unit) shown in the low left corner of thescreen. Reading of the instrument database is possible. SETUP Mode: Mode to set parameters of the instrument (configuration, calibration or diagnostic) or to read data. The outputcurrent is not proportional to the tank level. FAILSAFE Mode: The instrument automatically sets to the failsafe mode when a severe error has occurred. The outputcurrent is set to the value entered in the ADVANCED SETUP Menu.