ABB LMT100 Operation Instructions Manual

Also see for LMT100: Quick start guide Operating instruction

Contents

ABB LMT100 Operation Instructions Manual Manual pdf 67 page image

L M T S E R I E S | M A G N E TO S T R I C T I V E L E V E L T R A N S M I T T E R | O I/ L M T 1 0 0/ 2 0 0 - E N R E V. B674 The removable male header connecting the HMI board to theCommunication Board may be removed and shall be put backduring the reassembly processFigure 40 HMI Connector PinNOTICE – Property damageFailure to disconnect the power supply could result indamage while removing the communication boardelectronics5 Unscrew the communication board and gently disconnectthe connector on back of the boardFigure 41 Communication Board6 Connect the sensor flat cable to the new electronic modulewith dip switch 1 in up position7 Screw the new communication into the housing8 Connect the transmitter to power supply, wait ten secondsand lower dip-switch 1 to 0 position LMT can reconfigureitself with the previous configured parameters thanks to theauto-configuration functionality9 Reset the dip switch position10 Connect back the HMI board on top the communicationboard with the double male header connector removed instep 311 Place back the window cover removed during step 2Safety Inspection and TestAn LMT Series transmitter can be divided up into four majorcomponents the float, the sensor, the transmitter and theoutput All of these components and their subcomponentsshould be evaluated during each periodic inspection Thisinspection (and possible repair) should take less than 4 hours ifthe proper tools are made available Prior to inspection, thetransmitter should be removed from service following end userspecified procedures regarding lockout, tagout, wiring andcleaning Once removed from service, the LMT Seriestransmitter should be laid on a flat even surface For detailedsafety guidelines, refer to the LMT Series Safety Manual (SMLMT100200- EN A)Float inspectionThe LMT Series will detect and report the position of the floaton its sensor tube as a level of fluid in the process In order tomeasure the fluid in the process properly, the float must movefreely up and down the sensor tube partially submerged in theliquid level If the float were to become damaged or stuck onthe sensor tube, the transmitter will still report the floatposition regardless of the actual process fluid level This bydefinition is a Dangerous Undetectable failure To prevent thisfailure the float will need to be inspected for integrity andmovement Some transmitters will have two floats mounted onthe sensor tube This inspection should be done on both floats1 Move the float up and down the length of the sensor tube Itshould move freely from the bottom of the sensor tube tothe process connection2 Remove the float from the sensor tube by removing theretaining clip or bolt from the end of the transmitter Inspectthe float for signs of excessive wear or damage3 Submerge the float in a container of water to check for leaksas air bubbles escaping from the float The float is a sealedunit and any holes in the shell of the float could allow processfluid to seep insideIMPORTANT NOTEABB floats are designed for different specific gravity rangesThe float may or may not float in the water It may be necessaryto hold the float under the water to perform this testUpon completion of float inspection, place the float back on thesensor tube paying careful attention to float orientation SomeLMT Series transmitters will be equipped with float spacersdesigned to keep the float positioned in the measurable rangeof the sensor tube It is important that the spacer be replacedwhen the transmitter is reassembledIMPORTANT NOTEWhen handling the transmitter ensure the probe does not bendduring installation A bend in the probe could prevent the floatfrom travelling freely up and down and it could damage themagnetostrictive wire fitted inside