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Teledyne LXT-230 manual

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Table of contents for the manual

  • Page 1

    Model LXT-230 Transmitter Installation and Operating Manual for pH and ORP Teledyne Analytical Instruments 16830 Chestnut Street • City of I ndustry, CA 91748 888 -789-8168 • ask_tai@tele dyne.com • www.teledyne-ai.com[...]

  • Page 2

    Model LXT-230 Instruction Manu al / 2 TABLE OF CONTENTS UNPACKING THE INSTRUMENT ....... ...... ....... ...... ...... ....... ...... ....... ...... ...... ....... ...... ....... 4 1.0 GENER AL DESCRIPTION ....... ...... ....... ...... ...... ....... ...... ....... ...... ...... ....... ...... ....... .... 4 1.1 Membrane Switches . ...... ...... ...[...]

  • Page 3

    Model LXT-230 Instruction Manu al / 3 6.6 Calibrati on Error Dete ction & Electro de Operational Guidelines ....... ...... ....... ...... .... 15 6.7 Back-to-Factory Calibration ..... ...... ....... ...... ....... ...... ...... ....... ...... ....... ...... ...... ... 15 6.8 Output Calibration ........... ....... ...... ....... ...... ...... ..[...]

  • Page 4

    Model LXT-230 Instruction Manu al / 4 UNPACKING THE INSTRUMENT Your Teledyne inst rument has been care fully packaged to protect it from damage during shipment an d dry storage. Upon receipt please f ollow the procedure outlined bel ow. 1. Before un packing, inspect the conditi on of the shipping container to verify proper handlin g by the carr ier[...]

  • Page 5

    Model LXT-230 Instruction Manu al / 5 Fahrenheit. A toggle function in the Temperature Calibration Menu allows this selection to be performed in the field. 1.7 PID Outpu t (Optional) An optional PID output is available and provides a 4-20 mA, three-mode control signal to a transducer or a final control element. Prop ortional band is adjustable from[...]

  • Page 6

    Model LXT-230 Instruction Manu al / 6 2.0 INSTALLATIO N 2.1 Mounting Three typical inst allation configurations ar e avail able for the LXT-230 transmitte r: universal mounting, han drail mounting, and panel mounting configurations. The universal mounting configuration allows the LXT-230 to be mounted on a wall or a 2” pipe stand. U-bolts may be [...]

  • Page 7

    Model LXT-230 Instruction Manu al / 7 3.0 FAMILIARIZATION This se ction will pro vide an overview of the front panel key functions and the disp lay menu s for a single channel pH and ORP transmitter. Multiple channel transmitters will have the same menus. 3.1 Key Functions Cursor positions or numeric adjustments are performed by pressing the approp[...]

  • Page 8

    Model LXT-230 Instruction Manu al / 8 3.2.2 Main Menu This menu appears after the Copyright Display when power is first applied to the LXT-230. The Main Menu di splays the measured process variable, temperature, and the current output in pe rcent of f ull- scale. While in this menu, the current output can be adj usted and locked in a manual mode to[...]

  • Page 9

    Model LXT-230 Instruction Manu al / 9 The t op line displays the buffer, or calibr ation point , at which the last calibrat ion was performed. For pH transmitters, the bottom line displays the electro de slope, or efficiency, in millivolts per pH (mV/pH). ORP t ransmitters express efficiency in absolute mi llivolt s per millivolt (m Va/mV). When in[...]

  • Page 10

    Model LXT-230 Instruction Manu al / 10 4.0 SENTINEL DIAGNOSTICS The basic menu structure of the LXT-230 transmitter is architecturally the same as the LXT- 230 pH , ORP and PION, with the only va riable being the diagnostic information on the main and special diagnostic menus. The critical path to y our process measurement is via the TAI sensor/ele[...]

  • Page 11

    Model LXT-230 Instruction Manu al / 11 To file the input, with the microprocessor, exit the calibrate mode by pressing either menu selection key. The u pper half of the split screen menu displays absolute reference potential (±2 millivolts) directly from the electrode vi a the diagnostic signal co conditione r located in the sensor. This half of t[...]

  • Page 12

    Model LXT-230 Instruction Manu al / 12 5.0 MAINTENANCE If service of the internal components is required, always turn off the power to the instrument. 5.1 Clean ing Cleaning the front panel can be performed with a detergent and water. DO NOT USE ACETONE, ACID OR CAUSTIC SOLUTIO NS ON THE ENCLOSURE SURFACE. If the enclosure cover must be rem o ved, [...]

  • Page 13

    Model LXT-230 Instruction Manu al / 13 6.0 CALIBRATION 6.1 Manual Output Mode To perform calibrations with out interferi ng with control or recorder functions, the LXT-230 incorporates a manual output mode. The current output is set to the desired level and saved until ch anged or released fro m the manual mode. NOTE: Prior to any calibratio n the [...]

  • Page 14

    Model LXT-230 Instruction Manu al / 14 2 pH 4.00 -58.2 mV/pH 2 ORP 180 .0 mV .980 mV/ORP Procedure: 1. Press the appropriate MENU SELECTION key to reach the Electrode Standardization Menu and locate the cursor under the "1" as illustrated in section 3.2.4. 2. For diagnostic reasons n ote the p H and mV values from the prior calibration. 3[...]

  • Page 15

    Model LXT-230 Instruction Manu al / 15 diagnostic tool in determining the degrada tion of the ele ctro de. Large differences between calibrations m ay indicate coating or damage to the measurement half-cell. 6.5 Calibration Us ing a Grab Sample a s a Standard The L XT-230 allows easy standard ization t o a grab sample value by placin g the process [...]

  • Page 16

    Model LXT-230 Instruction Manu al / 16 Procedure: 1. Press the appropriate MENU SELECTION key to reach the Output Calibration Menu. 2. Position the cu rsor on the top line to change the 4 mA point or the bottom line to change the 20 mA point. 3. Press both horizontal C ALIBRATE keys simultaneously to enter the calibrate mode. 4. To change the value[...]

  • Page 17

    Model LXT-230 Instruction Manu al / 17 4. To toggle back to the first unit of measurement, press the CALIBRATE keys again. Trim °C .0 Unit 25.0°C Trim °F .0 Unit 77.0°F[...]

  • Page 18

    Model LXT-230 Instruction Manu al / 18 7.0 LXT-230 MODEL NUMBER DESIGNATORS Channel 1 Input & Output LXT-230- PH/MA pH LXT-230- OR/MA ORP LXT-230- PION/MA Specific Ion (see n ote 1) Note 1: F or PION, the model number will reflect the ion being measured; for example, Ca f or calcium, Fl for fluoride, et c . Channel 2 Input PH pH OR ORP PION Spe[...]

  • Page 19

    Model LXT-230 Instruction Manu al / 19 8.0 TROUBLESHOOTING GUIDE Symptom Possible Causes Suggested Acti ons No power to the instrument. Check power supply to be sure the correct voltage is being su pplied to the transmitter. (13.5 to 50 VDC) Check polarity of transmitter wiring. Contrast level is set too low. Set contrast level t o a higher value. [...]

  • Page 20

    Model LXT-230 Instruction Manu al / 20 Electrode Span Menu, then perform a buffer calibration. Check the sensor and electrode for proper operation. Wrong temperature correction has been calibrated in the temperature trim. Examine the temperature and the Temperature Calibration Menu. Adjust trim as required. LCD turns black. Power to the transmitter[...]

  • Page 21

    Model LXT-230 Instruction Manu al / 21 APPENDIX A - SPECIFICATIONS MEASUREMENT RANGE pH: 0.00 to 14.00, fully expandable and reversible, standard. -2.00 to 14.00 pH , op tional. ORP: +1000 to -1000 mV, fully expandable and reversible, standard. OUTPUT 4-20 mA or 20-4 mA, linear and expan dable. Up to a maximum of 3 out puts. POWER REQUIREMENTS (wit[...]

  • Page 22

    Model LXT-230 Instruction Manu al / 22 Temperature Trim Allows for compensation for any differen ces in RTDs b y progr amming the offset into the transmitter. Temperature Display Temperature can be field configured to display in OC or OF. Display Contrast Fully adjustable f or ambient lighting conditions[...]