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Teledyne Analytical Instruments LXT-220 Operating Instructions Manual

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OPERATING INSTRUCTIONS FOR
LXT-220
Dissolved Oxygen
Controller
P/N Mxxxxx
ECO:
DANGER
Toxic gases and or flammable liquids may be present in this monitoring system.
Personal protective equipment may be required when servicing this instrument.
Hazardous voltages exist on certain components internally which may persist
for a time even after the power is turned off and disconnected.
Only authorized personnel should conduct maintenance and/or servicing.
Before conducting any maintenance or servicing, consult with authorized
supervisor/manager.
Teledyne Analytical Instruments

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  • Page 1 Hazardous voltages exist on certain components internally which may persist for a time even after the power is turned off and disconnected. Only authorized personnel should conduct maintenance and/or servicing. Before conducting any maintenance or servicing, consult with authorized supervisor/manager. Teledyne Analytical Instruments...
  • Page 2 All manuals and user guides at all-guides.com LXT-220 DO Copyright © 2005 Teledyne Instruments/ Analytical Instruments All Rights Reserved. No part of this manual may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any other language or computer language in...
  • Page 3 All manuals and user guides at all-guides.com Dissolved Oxygen Controller Specific Model Information Instrument Serial Number: _______________________ Instrument Range: _______________ Calibrated for: _______________ Teledyne Analytical Instruments...
  • Page 4 All manuals and user guides at all-guides.com LXT-220 DO Safety Messages Your safety and the safety of others is very important. We have provided many important safety messages in this manual. Please read these messages carefully. A safety message alerts you to potential hazards that could hurt you or others.
  • Page 5 Manuals do get lost. Additional manuals can be obtained from TI/AI at the address given in the Appendix. Some of our manuals are available in electronic form via the internet. Please visit our website at: www.teledyne-ai.com. Teledyne Analytical Instruments...

  • Page 6: Table Of Contents

    Installation .................. 19 2.1 Unpacking the Instrument 2.2 Mounting 2.3 Electrical Connections 2.3.1 AC Power 2.3.2 Sensor Wiring 2.4 Configuring the LXT-220 2.5 Calibration Operation ..................23 3.1 Using the Front Panel Keys 3.1.1 Menu Selection Keys 3.1.2 Calibrate Keys 3.2 Menus...
  • Page 7 All manuals and user guides at all-guides.com Dissolved Oxygen Controller 3.2.4.2 Setup Submenu 3.2.4.3 Status Menu 3.2.4.4 Exit/Stay Menu 3.3 Configuring the LXT-220 3.3.1 Password Protection 3.3.1.1 Changing Protection Level 3.3.1.2 Changing Operational Password 3.3.1.3 Changing Configuration Password 3.3.2 4-20 mA Output Assignments 3.3.3 Manual Mode Assignment...
  • Page 8 All manuals and user guides at all-guides.com LXT-220 DO A.4 Model Designation Index.................... 59 Teledyne Analytical Instruments viii...

  • Page 9: List Of Figures

    Dissolved Oxygen Controller List of Figures Figure 1-1: LXT-220 Front Panel...........16 Figure 1-2: Internal Layout of the LXT-220 DO Controller .....17 Figure 2-1: Opening the Front Panel ..........20 Figure 2-2: LXT-220 Electrical Connections ........21 Figure 3-1: Available Menus and Submenus .........25 Figure 3-2: Numerical Entry Using Front Panel Keys ....32...

  • Page 10: List Of Tables

    All manuals and user guides at all-guides.com LXT-220 DO List of Tables Table 3-1: Protection Level Exceptions......... 33 Table 4-1: Troubleshooting............52 Teledyne Analytical Instruments...
  • Page 11 Since the use of this instrument is beyond the control of Teledyne Instruments/ Analytical Instruments, referred as TI/AI, no responsibility by TI/AI, its affiliates, and agents for damage or injury from misuse or neglect of this equipment is implied or assumed. Teledyne Analytical Instruments...
  • Page 12 All manuals and user guides at all-guides.com LXT-220 DO Teledyne Analytical Instruments...

  • Page 13: Introduction

    Highly customizable, the Model LXT-220 comes standard with a single 4-20mA current output but can have as many as five. The current output is field selectable and may be expanded to any range within the transmitter’s full operating...

  • Page 14: Main Features Of The Transmitter

    HART Communications option which alerts the operator to a pending DO, pH, ORP, or ISE electrode failure. The LXT-220 is housed in a rugged NEMA-4X housing with all operator switches conveniently located on the front panel. 1.2 Main Features of the Transmitter...
  • Page 15 The PID output can be assigned and configured to any of the available outputs. • Multiple Output: The standard LXT-220 DO Controller is provided with a single output. With the multiple output option, up to four additional outputs can be added. These outputs can be defined in the field as the process variable (DO, pH, ORP, resistivity, conductivity), temperature, or PID.

  • Page 16: Front Panel

    1.4 Front Panel The operator interfaces with the instrument from the front panel. Figure 1-1 shows a standard single channel LXT-220 DO instrument front panel. The panel includes the LCD display capable of outputting information in both a textural and graphical format. There are 6 membrane switches (keys) that control the operation of the unit.

  • Page 17: Internal Connections

    DC signal and the other for 115VAC power wiring. Access to the terminal blocks is gained after removing the 4 captive jackscrews on the front of the instrument. Figure 2 shows the internal layout of the LXT-220 Controller. A label on the enclosure cover shows the terminal block arrangement for all the wiring along with the model number and the factory assignment of the output signals.
  • Page 18 All manuals and user guides at all-guides.com Introduction LXT-220 DO Teledyne Analytical Instruments...

  • Page 19: Unpacking The Instrument

    • Configuring the Instrument • Calibration 2.1 Unpacking the Instrument The LXT-220 Controller has been carefully packaged to protect it from damage during shipment and dry storage. Upon receipt please follow the procedure outlined below: 1. Before unpacking, inspect the condition of the shipping container to verify proper handling by the carrier.

  • Page 20: Electrical Connections

    All manuals and user guides at all-guides.com Installation LXT-220 DO • Handrail mounting plate • Panel mounting configurations. U-bolts may be ordered separately. Refer to the following application drawings for mounting details: 4024011 Dimensions, wall & pipe mounting. The unit is supplied with a universal-mounting bracket. Two slots on each side will accommodate U-Bolts for pipe mounting.

  • Page 21: Ac Power

    THE AC INPUT LINE IS OFF BEFORE WIRING THE LXT-220. Application drawing 4024003 illustrates the proper power wiring for single channel LXT-220 as does the affixed label on the backside of the front panel. The wires are best fed through the right conduit as shown in Figure 2-2.

  • Page 22: Configuring The Lxt-220

    Configuring the instrument is described in Section 3 of this manual. 2.5 Calibration Prior to using the instrument for the first time, the LXT-220 must be calibrated. The specific calibration procedure used depends on the application. Among other things, the calibration routine establishes the correspondence between the 4-20mA output signal and the application dependant measurable parameter.

  • Page 23: Operation

    3.1 Using the Front Panel Keys Cursor positions or numeric adjustments are performed by pressing the appropriate keypad. The LXT-220 uses an "underscore" cursor in each of the menus. Holding down the keypad will automatically scroll the cursor or numeric values.

  • Page 24: Menus

    To exit the calibrate mode, press either of the MENU SELECTION keys. 3.2 Menus The LXT-220 contains a series of menus and submenus from which different functions can be accessed. Even though the display only shows 4 menus per screen, you can scroll through all available menus by using the MENU SELECT ▲...

  • Page 25: Contrast

    Display contrast can be adjusted to allow for variations of ambient lighting and viewing angle by using this menu. The Contrast Menu is the same for all LXT-220 controllers and is always located as the uppermost menu. To access this menu from the Main Menu, press the ▲...

  • Page 26: Main Menu

    3.2.2 Main Menu This menu appears after the copyright display when power is first applied to the LXT-220. The MAIN MENU displays the measured process variable, temperature, and the current output in percent of full- scale. While in this menu, the current output can be adjusted and locked in a manual mode to provide an undisturbed output during sensor calibrations.

  • Page 27: Parameter Selection Menu

    With the cursor on BUFFER, if you press ◄ and ► together the LXT-220 will enter the calibration menus (standardize and span). Scrolling to and choosing SETUP brings you to where you can configure and setup the instrument. The STATUS section allows the user to view the calibration engineering data (mV input from the sensor and the zero potential from the last cal).

  • Page 28: Setup Submenu

    The standard LXT-220 provides a single output channel but options are available to expand the number of current outputs to 4. See Section 3.3 Configuring the LXT-220 in this manual for information on assigning other parameters to additional outputs.

  • Page 29: Status Menu

    (on) and the bottom line defines the point in which the relay is de-energized (off). The LXT-220 can contain up to 6 sets of relay contacts. Refer to Section 3.3.5 Relay Assignments to set up the number of contacts.

  • Page 30: Exit/Stay Menu

    3.3 Configuring the LXT-220 To initially configure or reconfigure the instrument, use the left- side ▲ and ▼ MENU SELECT keys to scroll to the bottom of the menus list and stop when the CONFIGURE/TRIM option is displayed.

  • Page 31: Password Protection

    1 to 4. No digits are shown on the keyboard. It is necessary to remember that the top key is 1, the right key is 2, the bottom key is 3, and the left key is 4. See Figure 3-2. Teledyne Analytical Instruments...

  • Page 32: Figure 3-2: Numerical Entry Using Front Panel Keys

    All manuals and user guides at all-guides.com Operation LXT-220 DO Figure 3-2: Numerical Entry Using Front Panel Keys After successfully entering the operational password it remains valid for 60 seconds after exiting the calibration mode on that display. During that time a second display can be accessed without re-entering the password.

  • Page 33: Changing Protection Level

    To enter a new operational password, navigate to the old password (or no PW) using the (CALIBRATE) ◄/ ► keys and select by pressing both (CALIBRATE) ◄/ ► keys simultaneously. This brings up the new operational password screen. New opr password Teledyne Analytical Instruments...

  • Page 34: Changing Configuration Password

    All manuals and user guides at all-guides.com Operation LXT-220 DO Press both (CALIBRATE) ◄/ ► keys again to enter a new operational password. 1 to 8 digits may he entered. Press either of the menu keys to accept the new password when done.

  • Page 35: Ma Output Assignments

    3.3.2 4-20 mA Output Assignments The next group of displays are used to assign the 4-20 mA outputs. Note: The LXT-220 has been configured at the factory for your specific application as specified at the time of the order. Using the MENU SELECT ▲/▼ keys, scroll down to the 4-20 mA ASSIGN option and select it by pressing both CALIBRATE ◄/ ►...

  • Page 36: Manual Mode Assignment

    All manuals and user guides at all-guides.com Operation LXT-220 DO cyclic. Use either of the MENU SELECT ▲/▼ keys to accept the selection and move the cursor back to the left. The displayed selection remains in effect until changed and the selection is remembered through power outages of indefinite length.
  • Page 37 The percent output field does not appear in the operational display unless a 4-20 is assigned to it. Conversely, when changing the 4-20 assignments a conflict can arise if a 4-20 with a pre-existing manual mode control is reassigned to Teledyne Analytical Instruments...

  • Page 38: Hart Output Assignments

    All manuals and user guides at all-guides.com Operation LXT-220 DO a function with its own manual mode output. The 4-20 assignment display will show if the output is associated with an assignable manual mode. Regardless of the cause, the affected operational display manual mode fields will begin with a question mark when a conflict exists.
  • Page 39 It is possible to assign the analog output to other sources, but other assignments are non-standard, and the units displayed by the remote system will not be correct. Teledyne Analytical Instruments...

  • Page 40: Relay Assignments

    All manuals and user guides at all-guides.com Operation LXT-220 DO If the 4-20 selected for the HART analog output is assigned to “missing” or “unused” then the digital representation of the output current will be “not a number”, but with up to four digital variables still being transmitted.

  • Page 41: Trim

    CALIBRATE keys are depressed and the output current is set to 4.00 mA, overriding the output assignment. Measure the 4-20 output #1 current with an ammeter, and adjust the number on the top line until the meter reads 4.00 mA. Teledyne Analytical Instruments...

  • Page 42: Input A/D Converter Trim

    All manuals and user guides at all-guides.com Operation LXT-220 DO The next display is for trimming the 20 mA point of output #1 and it works the same as the 4 mA trim. The 4 mA and 20 mA trims do not interact, and the endpoint trims are linearly interpolated for other output values.

  • Page 43: Pid Assignments

    4-20 output scaling is fully specified by the PID setup parameters in the same section. If relays are assigned to a PID output there will be setpoint Teledyne Analytical Instruments...

  • Page 44: Calibration

    3.4.1 Manual Output Mode In order to perform calibrations without interfering with control or recorder functions, the LXT-220 incorporates a manual output mode. In the manual output mode, the current output is set to the desired level and saved until changed or released from the manual mode. On LXT-220s with the optional PID controller output on channel 2, the current output displayed is the PID controller output.

  • Page 45: Parameter Selection Menu

    This "M" signifies that the transmitter output is in manual. 3. Press only the left-hand ◄ CALIBRATE key and observe the "M" disappear, releasing the LXT-220 from the manual output mode. The % output value will return to the real-time current output.

  • Page 46: Buffer Menu

    All manuals and user guides at all-guides.com Operation LXT-220 DO Buffer Setup Status Parameter Selection Menu • BUFFER: Perform a 1 or a 2 point calibration • SETUP: Set up the range of the 4-20 mA output • STATUS: Information only. Shows the data stored from the last calibration.

  • Page 47: Two-Point Buffer Calibration (Span)

    Span calibration menu pH Procedure: 1. Perform a one-point calibration as outlined in Section 3.4.2.2. 2. Press the appropriate MENU SELECTION key to reach the Electrode Span Menu and locate the cursor under the "2" as illustrated. Teledyne Analytical Instruments...

  • Page 48: Calibration Using A Grab Sample As A Standard

    ALIBRATION SING A AMPLE AS A TANDARD The LXT-220 allows easy standardization to a grab sample value by placing the process value into the first calibration point. Procedure: 1. Record the O value of the process when the sample is extracted.

  • Page 49: Calibration Error Detection & Electrode Operational Guidelines

    3.4.2.6 B ACTORY ALIBRATION This feature allows the LXT-220 to be reset to "typical electrode" for electrode potentials. As the electrode ages it will deteriorate and the mV/FS will decay and will eventually require replacement. If the membrane is torn or coated the calibration will be either sluggish or out of range.
  • Page 50 All manuals and user guides at all-guides.com Operation LXT-220 DO 3. This procedure is required at BOTH of the calibration points. Teledyne Analytical Instruments...

  • Page 51: Routine Maintenance

    4.1.1 Cleaning Although the LXT-220 NEMA 4X enclosure can withstand harsh environments, it may become necessary to clean the front panel if it becomes coated or dirty. Cleaning the front panel can be performed with a detergent and water.
  • Page 52 All manuals and user guides at all-guides.com Maintenance LXT-220 DO Table 4-1: Troubleshooting SYMPTOM POSSIBLE CAUSES SUGGESTED ACTION The LCD does not No power to the Check power supply display. instrument. to be sure the correct voltage is being supplied to the transmitter.

  • Page 53: Appendix

    Response Time: 90% of step change in 1 second Accuracy: ±0.10% of full scale Linearity: ±0.05% of full scale Sensitivity: ±0.05% Stability: ±0.2% per year @ 0 to 70°C Repeatability: ±0.1% Input/Output Isolation: Max 300V between process input and any 4-20mA output Teledyne Analytical Instruments...
  • Page 54 All manuals and user guides at all-guides.com Appendix LXT-220 DO Maximum Loop Impedance: 800Ω on 4-20 outputs with internal 24VDC Digital Interface: HART option Operating Temperature: -4° to 158°F (-20° to 70°C) Dimensions: 5.67” H, 5.67” W, 6.97” D Temp. Compensation: Automatic, -30 to 140°C, RTD. Accuracy within ±1.0°C over a 0-100°C span.
  • Page 55 Dissolved Oxygen Controller Appendix A.2 Model Designation The standard LXT-220 controller is 110VAC powered unit in a 1/2 DIN, NEMA 4X enclosure. It incorporates a backlit graphics display and a membrane keypad. This instrument requires an external 24VDC to power the outputs. An option is available for an internally generated 24VDC powered instrument.
  • Page 56 All manuals and user guides at all-guides.com Appendix LXT-220 DO Channel 3 Input: Input from an external 4 to 20mA device Input from an external relay contact device * Sentinel Diagnostic: DIAG1Sentinel Diagnostic on channel 1 DIAG2Sentinel Diagnostic on channel 2...
  • Page 57 Optional power requirements: Standard powered by 120VAC 24 VDC internally generated to power the 4 to 20 mA output cards LXT-220 controller powered by 24 VDC Special options: Output = function of dual inputs: ratio, free chlorine, differential, average: SPECIFY!
  • Page 58 As an example: MODEL NUMBER EXAMPLE: LXT-220-PH/MA-PS2-UM This indicates the LXT-220 Controller for pH applications with a standard single 4-20mA output. The controller has an internal 24 VDC power supply to power the output card. The instrument is equipped with a universal mounting plate.
  • Page 59 22 conduit hole, 17 feature codes, 57 configuration password. See password features, 14 CONFIGURE/TRIM, 30 figures listing, ix configuring LXT-220, 30 flashing asterisk, 49 connections, 17 front panel, 16 contrast, 52 gasket, 51 contrast menu, 24, 25...
  • Page 60 All manuals and user guides at all-guides.com Index LXT-220 DO HART assignment, 38, 39 opening the front panel, 20 hysteresis, 15 operating temperature, 54 hysterisis, 13 operation, 23 impedance, 54 operational password, 32 incrementing a value, 16 options, 14 input, 13, 27...
  • Page 61 39 white screen, 25 specific compensation, 14 wiring, 21 specific ion, 13, 14, 42, 53 wiring label, 17, 21 specifications, 53 zero electrode offset, 14, 22 stability, 53 zero potential, 27, 29 standardization, 22, 44, 46 Teledyne Analytical Instruments...

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