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Teledyne Analytical Instruments OPER A TIN G INSTRUCTIONS FOR LX T -2 20 Dissolved Oxygen Controller DANGER To xic g ase s a nd o r fl a mmabl e liq ui ds may b e pre s ent i n t his m onit ori ng sy ste m. Personal protective e q uipment may be required when servicing this instrument.
LXT-220 DO Teledyne Analytical Instruments ii Copyright © 2005 Teledyne Instruments/ Analytical Instruments All Right s Reserved . No par t of this m anual may be r epro duced, tra nsmitted, transcri.
Dissolved Oxygen Controller Teledyne Analytical Instruments iii Speci fic Model Info rma tion Instrument S erial Nu mber: _______________________ Instrument Ra ng e: _______________ Calibrated for: __.
LXT-220 DO Teledyne Analytical Instruments iv Safety M e ssages Your safety and the saf ety of others is very important. We have provided ma ny important safety messages in this manual. Please read these me ss ages carefully. A safety message alerts you to potential hazards that could hurt you or others.
Dissolved Oxygen Controller Teledyne Analytical Instruments v IF YOU USE THE ANALYZER IN A MANNER OTHER THAN THAT FOR WHICH IT WAS INTENDED, UNPREDICTABLE B EHAVIOR COULD RESULT POSSIBLY ACCOMPANIED WITH HAZARDOUS CONSEQUENCES .
LXT-220 DO Teledyne Analytical Instruments vi T ab le of Contents List of Fig ures .............................................................................. ix List of Ta bles ......................................................................
Dissolved Oxygen Controller Teledyne Analytical Instruments vii 3.2.4.2 Setup Sub menu 28 3.2.4.3 Status Menu 29 3.2.4.4 Exit/Stay Menu 30 3.3 Configuring the LXT-220 30 3.3.1 Password Protection 31 3.3.1.1 Changing Protection Level 33 3.3.1.2 Changing Opera tional Passwo rd 33 3.
LXT-220 DO Teledyne Analytical Instruments viii A.4 Model Designation 55 Index ........................................................................
Dissolved Oxygen Controller Teledyne Analytical Instruments ix List of Figures Fig ure 1-1 : LXT-220 Fron t Panel ...................................................16 Figure 1-2 : Internal Layout of the LXT-220 DO Controller .. ....... ....17 Fig ure 2-1 : Opening th e Front P an el .
LXT-220 DO Teledyne Analytical Instruments x List of T ables Tab le 3-1 : Pro tectio n L evel Excep tio ns......................................... 3 3 Tab le 4-1 : Troub le shoo ting .
Dissolved Oxygen Controller Teledyne Analytical Instruments xi This i s a genera l purpo se instrument designed for liquid meas urements i n a non-hazardous ar ea. It is th e customer's responsibility to ensure safety es pecially w hen hot or flammable liquids are being analyzed since the potential of leaks always exist.
LXT-220 DO Teledyne Analytical Instruments xii.
Dissolved Oxygen Controller Introdu c tion Teledyne Analytical Instruments 13 Introduction 1.1 Over view Tele dyn e ’s Model LXT-220 Dissolved Oxygen Controller is a robust and versatile i nstru m ent fo r the measurement and process control of dissolved oxygen in a l iquid component.
Introdu c tion LXT-220 DO Teledyne Analytical Instruments 14 The LXT-220 can be upgraded with pre-pHault Diagnostics & HART Communications opti on w hich alerts the operator to a pending DO, pH, O RP, or ISE el ectrode failure.
Dissolved Oxygen Controller Introdu c tion Teledyne Analytical Instruments 15 • PID Outp ut: An optional PID output is ava ilable and provides a 4-20 mA, three-m od e con trol signal. Proportional band is adjustable from 0.1 t o 1,000%. R e s et and Rate a r e adjustabl e from 0.
Introdu c tion LXT-220 DO Teledyne Analytical Instruments 16 1.4 Front Panel The operator interfaces with the instrument from the front panel. Figure 1-1 shows a standard single c h a nne l LXT-220 DO instrument front panel . T he panel includes the LCD display capable of outputting information in bot h a tex tural and graphical format.
Dissolved Oxygen Controller Introdu c tion Teledyne Analytical Instruments 17 1.5 Int ernal Conn ecti ons A ll u ser co nne c tio ns ar e mad e i nsi de th e uni t on re mov ab le te rmin al bl ock s .
Introdu c tion LXT-220 DO Teledyne Analytical Instruments 18.
Dissolved Oxygen Controller Installation Teledyne Analytical Instruments 19 Installation Installation of t h e LXT-220 Contro ller involves: • Unpacking the i ns trument • Mounting • Making Electrical Connections • Configuring the Ins trument • Calibration 2.
Installation LXT-220 DO Teledyne Analytical Instruments 20 • Handrail m oun t ing pl ate • Panel mounting confi gur a tions. U-bolts may be orde r e d separ ately. Refer to the following applicati on dr a w ings for mounting details: 4024011 Dime n sions, wall & pipe mounting.
Dissolved Oxygen Controller Installation Teledyne Analytical Instruments 21 2.3.1 AC Power The LXT-220 re qu i res a 115 VAC 60 H z power source. A 24VD C unit is availa b l e as an op tion. CAUT I ON: MAKE SURE THE CIRCU I T BREAKER PROTECTING THE AC INPUT LINE IS OFF BEFORE WIRING THE LXT-220.
Installation LXT-220 DO Teledyne Analytical Instruments 22 illustrates the prop e r s ensor wiring and is also shown on the affixed label on the bac ksid e of the front pan el. 2.4 Configuring the LX T -22 0 The LXT-220 Cont ro l ler is used for measurement and control for a wide range of liquid a n a ly tical applications.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 23 Operation No one instrument h a s all the options described in this document. Some options must be s pecified at the time the instrument is purchased, and are not f i eld-al terable.
Operation LXT-220 DO Teledyne Analytical Instruments 24 3. With t h e cursor on a user se lectable menu item, for instance SETUP in the Paramete r Se l e ction Menu, pressing both horizontal CALIBRATE ke ys w ill take you to the next lower level of scr e ens: 4-20 mA scr een, Relay Setup screen, etc.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 25 There may be additional menus not shown in Figure 3-1 depe nd i ng on the opti ons you selected.
Operation LXT-220 DO Teledyne Analytical Instruments 26 2 D O 8 .4 0 8 4.0 % 2 5 .0 O C 1 D O 9 .2 8 9 2.8 % 2 5 .0 O C Ma in Men u , pH 2 O RP 5 00 50 .0 % 25 .0 O C Ma in Men u , ORP Proce du re: 1. Press the upper MENU SELECTION key to rea ch the Contrast Menu.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 27 1 DO . 00 p p m Cal .0 m V Z ero Cali brat ion M en u DO 3.2.4 Parameter Selection Menu This menu allows you to select what fun c t ion you would like to perform.
Operation LXT-220 DO Teledyne Analytical Instruments 28 4m A 1 .0 0 p p m 2 0m A 1 10 .00 p p m (n o w 18 .84 m a) ( ch1 P V ) Cu rre n t outp u t me n u Plot 4- 20 1 Sam ple .
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 29 1 On > 10 .00 p p m 1. Off < 9. 85 p pm ( ch1 P V ) Re la y s et up menu DO L o cus -1 7.0 O C El ectro de Data m enu O RP Noi se f ilt er 10 El ectro de Data m enu O RP 3.
Operation LXT-220 DO Teledyne Analytical Instruments 30 F ri 12: 00 :3 7 ( v ola t il e ) T ime of da y clo ck I n p ut -1 50. 4 m V a 0 mV .00 p pm El ectro de Data m enu O RP E xit Sta y Ex it / St ay m enu 3.2.4.4 E XI T /S TAY M ENU This menu c onf i rms tha t the user wishes to leave t he se ction that they are c urren tly in.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 31 INPUT A/D CONVERTER TRIM Some instrume n ts ha ve two ch annels measuring two unrelated quantities, and i n t hos e cases both channels can be configured from the same confi gur a tion menus.
Operation LXT-220 DO Teledyne Analytical Instruments 32 Figure 3-2: Numerical E ntry Us ing Front Panel Keys After successfully e n t er ing the operational password it remai ns valid for 60 sec onds af t er exiting the calibration mode on that display.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 33 The protecti on l ev el for the operational displays is the number on the le f t s ide of the second line. None of the operational displays are password protected i f t he pro tection level is 0.
Operation LXT-220 DO Teledyne Analytical Instruments 34 Press both (CALIBRATE) ◄ / ► keys again to e n te r a n ew operati on a l passw ord. 1 to 8 digits may he entered.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 35 The confi gur a tion p assword is rarely used and the configuration settings are m ore sensit ive, so the password should use more digits than the operational password.
Operation LXT-220 DO Teledyne Analytical Instruments 36 cyclic. Use eit h e r of th e ME NU SE LE CT ▲ / ▼ keys to acce p t the selection and m ov e th e cursor back to the left. The displa y ed selec t i on remai ns in e ffect until ch anged and the selecti on is rem e mbered through power outages of inde f i nite l ength.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 37 output field for each channel. The manual mode a s signment allows the percent ou t put dis pl ay to be associated with any of the 4-20 outputs, in- cluding t h e H ART output. When in the manual mode the 4-20 output is controlled from t h e keybo ard.
Operation LXT-220 DO Teledyne Analytical Instruments 38 a functi on wi t h its own manu al mode output. The 4-20 assignment display will s how if the output is associated w ith an assignable ma nu a l mode. Rega rd l ess of the cause, the affected operational di spl a y manu al mode fields will be g i n w ith a question mark when a conflict exists.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 39 HART analog 2:, HART analog 3:, HART an alog 4: The next t hre e displays assign the second, third, and fourth variables. The assignments are changed in the same w ay as for the 4-20 outputs.
Operation LXT-220 DO Teledyne Analytical Instruments 40 T rim O C . 0 U nit 2 5.0 O C Temperature Calibration If the 4-20 selected for the HART analog output is assigned to “missing” or “ unused.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 41 4m A 1 t rim . 00 0 4 to 20 mA trim The bott o m lin e shows the measured temperature. To change the displayed tempe r a tur e so it agrees with a measured value, place the cursor on the top line t h e n s imultaneously depress both CA LIB RATE ◄ / ► keys.
Operation LXT-220 DO Teledyne Analytical Instruments 42 1 in g a in 1 .0 00 0 40 0.0 m V Input A/D converter trim The next d i s play is for trimming the 20 mA point of output #1 and it works the same a s the 4 mA trim. The 4 mA and 20 mA trims do not interact, a nd t he endpoint trims are linearly interpolated for other output values.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 43 On two channel units the ne x t and last display is for trimming the channel 2 a na log input. 3.3.9 PID Assignments Two independe n t P roportional Integral Derivative (PID) controllers are available as options on all instruments, including one channel units.
Operation LXT-220 DO Teledyne Analytical Instruments 44 displays for them i n the se tup section, and they can be used for alarm purposes or otherwise. The bottom line of the displa y wi l l id entify the relay a s be i ng assigned to a PID output, and it will also show what the input to t h e PID proce s sor is assigned to.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 45 D O 7 .8 0 M 50 .0 % 2 5. 0 O C Ma in Men u , DO Proce du re: 1. If not at t h e M ain Menu, press the appropriate MENU SELECTION key to reach the Main Menu.
Operation LXT-220 DO Teledyne Analytical Instruments 46 Bu ffer S e tup S tatus Pa ramet er S elect ion Me nu 1DO .0 0 p p m Cal . 0 mV St an dar di zati on m enu pH • BUFFER: Perform a 1 or a 2 point c al ibration • SETUP: Set up the ra ng e of the 4-20 mA output • STATUS: Information onl y.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 47 2DO 8 .40 p p m Cal -17 3.8 m V / F S Sp an cal ibrat io n me nu pH 3. Clean t h e el ectrode and insert the sensor into the desired buffer. 4. Press both horizontal CA LIBRATE keys simultaneously to enter the calibrate mode.
Operation LXT-220 DO Teledyne Analytical Instruments 48 3. For diagnostic reasons note the DO and m V/FS values from the prior calibration. 4. Press both horizontal CA LIBRATE keys simultaneously to enter the calibrate mode.
Dissolved Oxygen Controller Operation Teledyne Analytical Instruments 49 2 DO 10. 0 p p m Cal -1 57. 5 m V / FS St an dar di zati on m enu @ fact ory d ef ault set ting s 1 DO .0 0 p p m Cal . 0 m V St an dar di zati on m enu DO @ f actory def au lt set ting s 4.
Operation LXT-220 DO Teledyne Analytical Instruments 50 3. This procedure i s required at BOTH of the calibration points..
Dissolved Oxygen Controller Maintenance Teledyne Analytical Instruments 51 Maintenance 4.1 Routine Maintenance Aside from normal c leaning rou tine maintenance is limited to recalibration. For recalibration, see Section 3.4 Calibration . However, if service of t h e int ernal components is required always turn off t h e pow er to the i ns trument.
Maintenance LXT-220 DO Teledyne Analytical Instruments 52 Table 4-1: Troubleshooting SYMPTOM POSSIBLE CAUSES SUGGESTED ACTION No power to the instrumen t. Check powe r supply to be su r e the correct voltage is being supplied to the transmitter. Contras t level is set too low.
Dissolved Oxygen Controller Appendix Teledyne Analytical Instruments 53 Appendix A.1 Specifications Packaging: NEMA-4X weatherproof encl osure suitable for g e ner al purpose application Power Requireme nts : 1 15/ 220 V A C or op ti on ally 24 V DC 0.
Appendix LXT-220 DO Teledyne Analytical Instruments 54 Maximum Loop Impedance: 800 Ω on 4-20 outputs with internal 24VDC Digital Interface : HART opti on Operating Temper atur e : -4° t o 158°F (-20° to 70°C) Dimensions: 5.67” H, 5.67” W, 6.97” D Temp.
Dissolved Oxygen Controller Appendix Teledyne Analytical Instruments 55 A.2 Model Designation The standa rd L XT-220 con troller is 110VAC powered unit in a 1/2 DIN, NEMA 4X enc losure. It incorporate s a backlit graphics display and a mem br a ne k eypad.
Appendix LXT-220 DO Teledyne Analytical Instruments 56 Chann el 3 Input: EX Input from an e x t ern al 4 to 20mA device EX1 Input from an e x t ern al relay contact device * Sentinel Diagnostic: DIAG1.
Dissolved Oxygen Controller Appendix Teledyne Analytical Instruments 57 Optional power require m e n ts: PS1 Standard powered by 120VAC PS2 24 VDC internall y g e ner a ted to power the 4 to 20 mA out.
Appendix LXT-220 DO Teledyne Analytical Instruments 58 output must be s pecified. Output configuration options: MA 4-20 mA, standard TMP 4-20 mA, Tempe r a tur e (adjustable -100 to +200°C) PID 4-20 .
Dissolved Oxygen Controller I ndex Teledyne Analytical Instruments 59 Index A to D conve rter trim, 42 AC power. See power accuracy, 42, 53 address, 55 air, 47 alarm, 13, 15 HI, 13 LO, 13 alarm relay,.
Index LXT-220 DO Teledyne Analytical Instruments 60 HART assignment, 38, 39 hysteresis, 15 hysterisis, 13 impedance, 54 incrementing a value, 16 input, 13, 27 conditioned, 21 dual, 14 input range, 42 installation, 19 internal clock, 54 internal layout, 17 internal power s upply, 15 isolation, 53 keyboard control, 37 LCD.
Dissolved Oxygen Controller I ndex Teledyne Analytical Instruments 61 re lay se tp oi nts , 40 release manual output, 45 repeatability, 53 reset, 15 resistivity, 13, 14, 53 response time, 53 res tore .
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