Devar - Model 18-LPI - Loop Powered Indicator - Manual

DEVAR Inc.706 Bostwick Avenue, Bridgeport, CT 06605203-368-6751 FAX 203-368-3747http://www.devarinc.com e-mail: info@devarinc.comModel LD-LPILOOP POWEREDINDICATORManual No. 990629 5/02 General DescriptionThe LD-LPI is a two-wire digital indicator that provideslocal process indication on a 3-1/2 digit liquid crystal dis-play. The Indicator features 3-1/2, easy to read, 1 inchhigh active digits and a dummy zero. It is is powereddirectly from the 4 to 20 mA input loop, dropping less than1 volt across the input terminals.The LD-LPI provides a digital readout directly proportion-al to the current input. The indicator is calibrated at thefactory to read 0 to 100.0% for a 4 to 20 mA input, how-ever, it can easily be recalibrated in the field to readdirectly in engineering units, such as temperature or flow.Each indicator comes with a selection of stick-on labels ofcommonly used engineering units such as GPM, PSI,etc.. These labels can be attached to the display so thata user can immediately determine what the indicator isreading.Recalibration of the LD-LPI is easily accomplishedthrough the use of switches and trim pots. The span canbe adjusted from 0 to 3998 counts in three switch selec-table ranges and the zero offset can be adjusted from -1999 to +1999 counts also in three switch selectableranges. Fine adjustment of span and zero is made on twononinteractive 15 turn trim pots. Another feature of theLD-LPI is a nonactive (dummy) zero, which can beenabled or disabled by means of a DIP switch. One offour decimal point positions or no decimal point is alsoDIP switch selectable. The LD-LPI provides negativepolarity indication, which appears when displaying quan-tities such as - 300 to 1000 o F. The negative sign can,if desired, be disabled by means of a DIP switch.An additional feature of the LD-LPI is the internal calibra-tor. The indicator can be field calibrated while installed ina working 4 to 20 mA loop, regardless of the currentthrough the loop, simply by switching into the calibratemode. The indicator can also be calibrated on the benchby using a conventional calibrator or by connecting a 1 to1.5 volt power source (flashlight battery) across the inputterminals and switching to the calibrate mode.The LD-LPI is housed in a rugged, indoor/outdoor NEMA4X, polycarbonate housing. This housing is corrosionresistant and dust-tight, and will withstand direct waterspray under hose pressure. Options available include a1/2 NPT water-tight conduit hub (Option M42), a panelmounting bezel (Option M46), a bracket for 2 inch pipemounting (Option M36), a 3 inch snap-track mountingbracket (Option M31S) and DIN rail mounting bracket(option M31D).Specifications1. Inputa. Range: 4 to 20 mAb. Voltage drop: 0.98V @ 20mA, 25 o Cc. Forward current over range: 100 mA max.d. Reverse current: 100 mA max.2. Displaya. Type: 3-1/2 digit LCD, with dummy zero, 1" high digitsb. Range: -1999 to 1999 countsc. Decimal point: four positions or absent, switch selectabled. Polarity sign: negative polarity indication or none,switch selectablee. Action: forward acting (count increases with current), normal calibration; reverse acting (count decreases with current), obtained by appropriate zero settingf. Over range indication: display blanks except for most significant 13. Calibrationa. Span range: 0 to 3998 counts, 3 ranges switch selectable, fine adjustment on 15 turn trim pot, noninteractive with zero potb. Offset range: -1999 to +1999 counts, 3 ranges switch selectable, fine adjustment on 15 turn trim pot, noninteractive with span potc. Resolution: better than 1 count4. Performancea. Accuracy: ± 0.1% of span counts, ± 1 countb. Temperature effect (zero): ± 0.1 count / o Cc. Temperature effect (span): ± .01% of span countsper o Cd. Operating temperature: -30 to +85 o Ce. Ripple rejection: less than 1 count with 1 mApeak-to-peak, 60 Hz ripple at inputf. Sample rate: 2 per second5. Enclosurea. Material: polycarbonateb. Ratings: NEMA 4X, Flamability UL 94-5VINSTRUCTION MANUALLD-LPI LOOP POWERED INDICATORDEVAR Inc.706 Bostwick Ave., Bridgeport CT 06605-2396Tel: (203) 368 6751 Fax: (203) 368 3747www.devarinc.com E-Mail: info@devarinc.comManual No. 990629 (5/02) Page 1 of 6Field WiringField connections are made to a compression type terminalblock located at the bottom of the enclosure. To expose theterminal block remove the cover from the enclosure, loosenthe two screws at the corners of the PC board and remove thePC board from the enclosure. Terminals 1 and 2 are the pos-itive and negative input terminals, terminal 3 is a spare whichcan be used as a tie point. The field wiring terminal block isconnected to a two point terminal block located on the top lefthand corner of the PC board. When bench testing the unit,input signals can be connected directly to the top terminalblock without removing the PC board from the enclosure.Initial Settings1. Set Input Voltage Drop (Factory Calibrated) : input 20 milliamps at the input terminals of the indicator. Adjust pot "P1" for a voltage drop of 0.95 volts between the input terminals.2. Zero Adjustment (Factory Calibrated): To prevent the interaction of the span and zero pots the 4 milliamp offset is compensated for at the output of amplifier "U1". To do this, input 4 milliamps into the indicator, set switch2. position 2 to the normal operating position, and then adjust pot "P2" for 0.000 volts between pins 3 and 6 of amplifier "U1". 3. Calibration of Internal Calibrator (Factory Calibrated): Calibrate the display to read 00.0 to 100.0 for a 4 to 20 milliamp input following the instructions for calibrating the display. With the indicator operating (the value of theinput current does not matter) switch switch 2, position2. to the Activate Internal Calibrator position. Switch switch 2, position 1 to the Calibrate Zero position and adjust pot "P3", until the display reads 00.0. Switch switch 2, position 1 to the Calibrate Span position and adjust pot "P4" until the display reads 100.0. Return switch 2, position 2 to the Normal Operating position. Note that the input current has no effect on the display while switch 2 is in the Activate Internal Calibrator position.Display CalibrationTo calibrate the LD-LPI, proceed as follows:1. Determine desired display for a 4 to 20 mA input.Example: -30.0 to 195.0 o F2. Set span switches S1-1 and S1-2 for the proper span range.Example: Span = 1950 - (-300) = 2250 counts;set S1-1 off, S1-2 off; (Note: ignore decimal point) 3. Set zero switches S1-3 and S1-4 for proper zero range.Example: Zero = -300 counts; set S1-3 off,S1-4 off4. Select decimal point.Example: Select P3 decimal point; set S1-7 on, S1-5,6,8 off5. Enable or disable negative polarity indication.Example: Enable negative sign; set S1-10 on6. Enable or disable dummy zero.Example: Disable dummy zero; set S1-9 off7. Input 4 mA and set "zero pot" for bottom of range.Example: Adjust zero pot to display -30.08. Input 20 mA and set "span pot" for top of range.Example: Adjust span pot to display 195.09. The indicator is now calibrated.Note that the dummy zero is not an active digit and should not be used when determining spanand zero counts.Using The Internal CalibratorThe LD-LPI can be calibrated using the internal cal-ibrator, while installed in a working loop, or it canbe calibrated on the bench by connecting a 1 to 1.5volt supply across the input terminals as a powersource. To use the internal calibrator proceed asfollows:1. Set the calibrating switches for the desired span and offsetranges as described in the preceding section.2. Set switch 2, position 2 to the Activate Internal Calibrator position.3. Set switch 2, position 1 to the Calibrate Zero position, then adjust the "zero pot" until the bottom of the range is displayed.4. Set switch 2, position 1 to the Calibrate Span position, thenadjust the "span pot" until the the top of the range is displayed.5. Return switch 2, position 2 to the Normal Operation position. The indicator is now calibrated.Page 2 of 6Manual No. 990629 (5/02)S1-1 S1-2 SPAN RANGEOFF ON 000 TO 1530 COUNTSOFF OFF 1530 TO 2470 COUNTSON OFF 2470 TO 3998 COUNTSS1-3 S1-4 ZERO OFFSETON OFF -573 TO -1999 COUNTSOFF OFF -573 TO 573 COUNTSOFF ON 573 TO 1999 COUNTSS1-5 ON 1. 9 9 9_SELECT DECIMALPOINTS1-6 ON 1 9. 9 9_S1-7 ON 1 9 9. 9_S1-8 ON 1 9 9 9._S1-9 ON 1 9 9 9 0 ENABLE DUMMY ZEROS1-10 ON ENABLES NEGATIVE POLARITY INDICATIONP1P2P4P310123456798+INPUT (RED)-INPUT (BLACK)TO FIELD WIRINGTERMINAL BLOCK ATBOTTOM OF ENCLOSUREZERO POTSWITCHES1-1 TO 1-10ONMOUNTINGSCREWDUMMY ZEROSPAN POTMOUNTINGSCREW2-22-1ACTIVATE INTERNAL CALIBRATORCALIBRATE SPANNORM. OPERATIONCALIBRATE ZERODEPRESS TOACTIVATE SWITCH 2Fig. 1 PC Board LayoutFig. 2 Switch Setting TablePage 3 of 6Manual No. 990629 (5/02)LD-LPI%DEVAR Inc.5.514.723.152.362.690.79LD-LPI%DEVAR Inc.1.755.913.55SPARE+ -4/20 mAINPUT+ RED- BLACKTO PC BOARD-+Fig. 3 General DimensionsNotes:1. Four mounting holes for # 6 screws are located directlybelow the cover screws.2. Acess to the enclosure can be made by drilling, punching orsawing holes into the long side of the enclosure. Locatecenter of access holes 7/8 of an inch in from the back sideof the enclosure.Fig. 4 Panel Mount Dimensions Panel Cutout: 5.45 X 3.07±.015Fig. 5 Field WiringPage 4 of 6Manual No. 990629 (5/02)OPTION -LPSADD INTERNAL LOOP POWER SUPPLYTO LD-LPI LOOP POWERED INDICATORThe Model LD-LPI-LPS provides a regulated 24 volt DC power supply, which can be used topower an external 2-wire transmitter in a 4 to 20 mA instrumentation loop. The power supplyfeatures a split bobbin power transformer and output current limiting circuitry.The 24 volt power supply is normally connected in series with the field transmitter, the looppowered indicator and any other loads in the 4 to 20 mA loop. A two position terminal block isprovided for AC power and a six position terminal block is provided for connections betweenthe transmitter, the indicator and the power supply.Specifications:Power. . . . . . . . . . . . . . . 105 to 125 V, 50/60 Hz ,5 VA210 to 250 V, 50/60 Hz, 5 VA (Option E-71)Output Voltage. . . . . . . . . + 24 VDC ±1 VOutput Current. . . . . . . . . 25 mA, Internally LimitedLine Regulation. . . . . . . . 0.004% per Volt Typ., 0.06% per Volt Max.Load Regulation. . . . . . . 0.004% Typ., 0.04% Max.Ripple. . . . . . . . . . . . . . . 20 mV P-P, Max.Temperature Range. . . . -40 to 85 OCTemperature Effect. . . . . 0.008% per OC, Typ.Page 5 of 6Manual No. 990629 (5/02)1 2 3 4 5 6+ -LD-LPI-LPSTB1TB2115 VAC+ --+ + -4/20 mAINPUT SIGNAL24 VDCPOWER SOURCE1 2 3 4 5 6++ -LOAD+ -- +X TXT+ -LOAD- +Fig. 1 Internal Wiring of LD-LPI-LPSFig. 2 Typical Wiring For 2-Wire Field TransmitterRED BLUPOWERSUPPLYLD-LPIDISPLAY1 2 3 4 5 6++ -Page 6 of 6Manual No. 990629 (5/02)OPTION -BLADD BACK LIGHTING TO THE LD-LPIOption BL adds back lighting to the LD-LPI display. This option allows the meter to be easily viewed in low light condi-tions as well as in normal light conditions. The back lighting derives its power from the 4 to 20 mA loop and adds a 2 voltburden to the loop. The total input voltage drop for the LD-LPI-BL is 3 volts at 20 mA. DEVAR Inc.SH1REVWTSCALESIZE BDRAWING NO.MECHELECDESIGNAPPROVEDCONTRACT NO.CHECKEDAPPROVEDNONE-N/A-706 Bostwick Avenue, Bridgeport, Conn. 06605TEL: (203) 368-6751 FAX; (203) 368-37471 OF 1SHEETPREPAREDFINISHMATERIALThis Drawing is the sole property of DEVAR Inc., and is submitted on the understanding that the contents hereof are not published and are not to be disclosed.to third persons withoutprior permission.-N/A-NONEDWG NO.L O A D(+)(–) (+) (–)AG AGHADD 18-SLPI, 18-SLPI-IV AND 18-SLPI-SR, ECN 3081A02-08-95IADD LD-LPI, ECN 315401-22-98AG AGJ09-09-99K515107+(–)(+)515107K+32V MAX0V0V+32V MAXDUAL CHANNEL BARRIERNON-HAZARDOUS LOCATIONHAZARDOUS LOCATIONORADD LD-LPIX & -BL BACKLIGHT OPTION, ECN 3319-BL BACKLIGHT OPTIONVmax > VocImax > IscCi plus interconnecting wiring < CaLi plus interconnecting wiring < LaRHEOSTATPOTENIOMETERNOTES:T.C.RTD––+INTERCONNECTING DIAGRAM TO INTRINSICALLY SAFE APPARATUSDEVAR MODEL NOS.INDICATORS18-SLPI18-SLPI-1V18-SLPI-SRLD-LPILD-LPIX18-LPI18-LPI-WT18-LPI-SR18-LPIX18-LPIX-SR18-LPI-1V18-LPIX-1VTRANSMITTERS18-81118-81218-212A18-215ADEVAR MODEL NOS.Vmax > VtImax > ItCi plus interconnecting wiring < CaLi plus interconnecting wiring < LaREVAPPROVEDDATEDESCRIPTIONE04-22-91AGRELEASE ECN 2826BF02-26-92AGADD 18-LPI-WT, ECN 3027AGG32V WAS 30V, ECN 308102-07-95INTRINSICALLY SAFE ENTITY APPROVEDINTRINSICALLY SAFE ENTITY APPROVEDUNSPECIFIED DIMENSION TOLERANCE DECIMAL +/- 0.005" FRACTION +/- 1/64" ANGLE +/- 1/2 DEGREENEXTASS'Y NO.LOADSINGLE CHANNEL BARRIERRNT08-16-05FMAPPROVEDADD SM-822P-1, SM-822P-1T, SM-822P-2 & SM-822R, ECN 3208SM-822 P-1SM-822 P-1TSM-822 P-2SM-822 R1. HAZARDOUS LOCATION RATINGS: CLASS I, DIVISION 1, GROUPS A, B, C, D2. ENTITY PARAMETERS: Vmax = 32 V, Imax = 150 mA, Ci = 0 µf, Li = 0 mH3. INSTALLATION OF THE SYSTEM MUST BE IN ACCORDANCE WITH ANSI/ISA RP12.64. CONTROL ROOM INSTRUMENTATION TO OPERATE AT LESS THAN 250V rms5. DO NOT CONNECT mA METER TO TRANSMITTER MONITOR TERMINALS UNLESS AREA IS KNOWN TO BE SAFE6. THE ABOVE UNITS ARE NONINCENDIVE FOR CLASS I, DIVISION 2, GROUPS A, B, C, D LOCATIONS WITH A Vmax OF 32V. BARRIERS ARE NOT REQUIRED FOR DIVISION 2 OPERATION.7. NO REVISIONS WITHOUT PRIOR FACTORY MUTUAL APPROVAL 09-13-05