Teledyne LXT-220 User Manual
Teledyne Analytical Instruments
OPERATING INSTRUCTIONS FOR
LXT-220
Dissolved Oxygen
Controller
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.
P/N Mxxxxx
ECO:
LXT-220 DO
Teledyne Analytical Instruments ii
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
whole or in part, in any form or by any means, whether it be electronic, mechanical,
magnetic, optical, manual, or otherwise, without the prior written consent of Teledyne
Instruments/ Analytical Instruments, 16830 Chestnut Street, City of Industry, CA 91749-
1580.
Warranty
This equipment is sold subject to the mutual agreement that it is warranted by us free from
defects of material and of construction, and that our liability shall be limited to replacing or
repairing at our factory (without charge, except for transportation), or at customer plant at
our option, any material or construction in which defects become apparent within one year
from the date of shipment, except in cases where quotations or acknowledgements provide
for a shorter period. Components manufactured by others bear the warranty of their
manufacturer. This warranty does not cover defects caused by wear, accident, misuse,
neglect or repairs other than those performed by TI/AI or an authorized service center. We
assume no liability for direct or indirect damages of any kind and the purchaser by the
acceptance of the equipment will assume all liability for any damage which may result from
its use or misuse.
We reserve the right to employ any suitable material in the manufacture of our apparatus,
and to make any alterations in the dimensions, shape or weight of any parts, in so far as
such alterations do not adversely affect our warranty.
Important Notice
This instrument provides measurement readings to its user, and serves as a tool by which
valuable data can be gathered. The information provided by the instrument may assist the user
in eliminating potential hazards caused by his process; however, it is essential that all
personnel involved in the use of the instrument or its interface, with the process being
measured, be properly trained in the process itself, as well as all instrumentation related to it.
The safety of personnel is ultimately the responsibility of those who control process
conditions. While this instrument may be able to provide early warning of imminent
danger, it has no control over process conditions, and it can be misused. In particular, any
alarm or control systems installed must be tested and understood, both as to how they
operate and as to how they can be defeated. Any safeguards required such as locks, labels,
or redundancy, must be provided by the user or specifically requested of TI/AI at the time
the order is placed.
Therefore, the purchaser must be aware of the hazardous process conditions. The purchaser
is responsible for the training of personnel, for providing hazard warning methods and
instrumentation per the appropriate standards, and for ensuring that hazard warning devices
and instrumentation are maintained and operated properly.
Teledyne Instruments/ Analytical Instruments, the manufacturer of this instrument, cannot
accept responsibility for conditions beyond its knowledge and control. No statement
expressed or implied by this document or any information disseminated by the
manufacturer or its agents, is to be construed as a warranty of adequate safety control under
the user’s process conditions.
Dissolved Oxygen Controller
Teledyne Analytical Instruments iii
Specific Model Information
Instrument Serial Number: _______________________
Instrument Range: _______________
Calibrated for: _______________
LXT-220 DO
Teledyne Analytical Instruments iv
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. Each safety message is associated with a safety alert symbol.
These symbols are found in the manual and inside the instrument. The
definition of these symbols is described below:
GENERAL WARNING/CAUTION: Refer to the
instructions for details on the specific danger. These cautions
warn of specific procedures which if not followed could cause
bodily Injury and/or damage the instrument.
CAUTION: HOT SURFACE WARNING: This warning is
specific to heated components within the instrument. Failure
to heed the warning could result in serious burns to skin and
underlying tissue.
WARNING: ELECTRICAL SHOCK HAZARD: Dangerous
voltages appear within this instrument. This warning is
specific to an electrical hazard existing at or nearby the
component or procedure under discussion. Failure to heed this
warning could result in injury and/or death from
electrocution.
Technician Symbol: All operations marked with this symbol
are to be performed by qualified maintenance personnel only.
NOTE: Additional information and comments regarding a
specific component or procedure are highlighted in the form
of a note.
CAUTION: THE ANALYZER SHOULD ONLY BE USED FOR THE
PURPOSE AND IN THE MANNER DESCRIBED IN
THIS MANUAL.
No
Symbol
Dissolved Oxygen Controller
Teledyne Analytical Instruments v
IF YOU USE THE ANALYZER IN A MANNER OTHER
THAN THAT FOR WHICH IT WAS INTENDED,
UNPREDICTABLE BEHAVIOR COULD RESULT
POSSIBLY ACCOMPANIED WITH HAZARDOUS
CONSEQUENCES.
This manual provides information designed to guide you through
the installation, calibration operation and maintenance of your new
process controller. Please read this manual and keep it available.
Occasionally, some instruments are customized for a particular
application or features and/or options added per customer requests.
Please check the front of this manual for any additional information in
the form of an Addendum which discusses specific information,
procedures, cautions and warnings that may be peculiar to your
instrument.
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.
LXT-220 DO
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Table of Contents
List of Figures.............................................................................. ix
List of Tables ................................................................................ x
Introduction ................................................................................ 13
1.1 Overview 13
1.2 Main Features of the Transmitter 14
1.3 Optional Features 14
1.4 Front Panel 16
1.5 Internal Connections 17
Installation .................................................................................. 19
2.1 Unpacking the Instrument 19
2.2 Mounting 19
2.3 Electrical Connections 20
2.3.1 AC Power 21
2.3.2 Sensor Wiring 21
2.4 Configuring the LXT-220 22
2.5 Calibration 22
Operation .................................................................................... 23
3.1 Using the Front Panel Keys 23
3.1.1 Menu Selection Keys 23
3.1.2 Calibrate Keys 23
3.2 Menus 24
3.2.1 Contrast 25
3.2.2 Main Menu 26
3.2.3 Output Graph 26
3.2.4 Parameter Selection Menu 27
3.2.4.1 Calibration Submenu 27
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3.2.4.2 Setup Submenu 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 Operational Password 33
3.3.1.3 Changing Configuration Password 34
3.3.2 4-20 mA Output Assignments 35
3.3.3 Manual Mode Assignment 36
3.3.4 HART Output Assignments 38
3.3.5 Relay Assignments 40
3.3.6 Temperature Calibration 40
3.3.7 4-20 Trim 41
3.3.8 Input A/D Converter Trim 42
3.3.9 PID Assignments 43
3.4 Calibration 44
3.4.1 Manual Output Mode 44
3.4.2 Parameter Selection Menu 45
3.4.2.1 Buffer Menu 46
3.4.2.2 One-Point Buffer Calibration (Standardize) 46
3.4.2.3 Two-Point Buffer Calibration (Span) 47
3.4.2.4 Calibration Using a Grab Sample as a Standard 48
3.4.2.5 Calibration Error Detection & Electrode
Operational Guidelines 49
3.4.2.6 Back-to-Factory Calibration 49
Maintenance ................................................................................51
4.1 Routine Maintenance 51
4.1.1 Cleaning 51
4.1.2 Replacement of the Microprocessor: 51
Appendix .....................................................................................53
A.1 Specifications 53
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A.4 Model Designation 55
Index............................................................................................ 59
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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
LXT-220 DO
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List of Tables
Table 3-1: Protection Level Exceptions......................................... 33
Table 4-1: Troubleshooting........................................................... 52
Dissolved Oxygen Controller
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This is a general purpose instrument designed for liquid
measurements in a non-hazardous area. It is the customer's
responsibility to ensure safety especially when hot or
flammable liquids are being analyzed since the potential of
leaks always exist.
The customer should ensure that the principles of operating
this equipment are well understood by the user. Misuse of
this product in any manner, tampering with its components,
or unauthorized substitution of any component may
adversely affect the safety of this instrument.
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.
LXT-220 DO
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Dissolved Oxygen Controller Introduction
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Introduction
1.1 Overview
Teledyne’s Model LXT-220 Dissolved Oxygen Controller is a
robust and versatile instrument for the measurement and process control
of dissolved oxygen in a liquid component. 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
range. It can also be programmed as reverse acting; for example, a 4-20
mA output for a range of 0 to 10 ppm can be reversed to 10 to 0 ppm.
The standard instrument accepts a single input typically from a
Teledyne SP1 or SP2 Dissolved Oxygen probe however a dual input
option is available. This optional dual input extends the functionality of
the instrument to accept conditioned input from a variety of sensors for
specific process measurements such as:
• Second Dissolved Oxygen (DO) channel
• Resistivity/conductivity
• pH
• Oxidation-Reduction Potential (ORP)
• Specific Ion
For process control, the microprocessor based LXT-220
Transmitter employs a multi-bus system architecture for PID
temperature control and sensor-specific process variable outputs such as
DO, pH, ORP, Resistivity/Conductivity, and ion-specific element (ISE)
output as a function of multiple inputs. Up to six field-configurable
alarm or control relay outputs are available to the user to match
individual process needs. These relays can be field configured as high or
low alarms. Hysterisis (dead band) is defined by setting the ON and OFF
relay values. These relays can be configured to any of the input
parameters. (See Section 3.3.5).
Introduction LXT-220 DO
Teledyne Analytical Instruments 14
The LXT-220 can be upgraded with pre-pHault Diagnostics &
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
The LXT-220 Controller for dissolved oxygen applications
incorporates the following standard features:
• Front panel membrane switches
• Menu driven backlit display with contrast adjustment
• Automatic Calibration. This allows calibration points to be
defined upon initialization of the transmitter.
• An easy back to factory calibration menu allows the instrument
to return to a predetermined factory calibration. The default
parameters are: zero electrode offset and –157.5mV/FS slope.
• 4-20mA current output fully expandable to any range within the
transmitter’s full operating range. The output is field selectable
and fully programmable. The current output can be configured to
be reverse acting.
• Temperature Conversion. Temperature can be displayed in either
Fahrenheit or Celsius. The units can be toggled from one to the
other in the field with the conversion calculation performed
automatically.
1.3 Optional Features
The Model LXT-220 DO Controller is a versatile instrument
designed to meet the needs for liquid analytics and process control
across a wide range of applications. There are many options available
for the transmitter including:
• Dual Input: An optional second input can be provided for pH,
ORP, resistivity/conductivity, or Specific Ion. The second input
can also be used as a second analysis for dissolved oxygen or as
specific compensation for the primary input.
Dissolved Oxygen Controller Introduction
Teledyne Analytical Instruments 15
• PID Output: An optional PID output is available and provides a
4-20 mA, three-mode control signal. Proportional band is
adjustable from 0.1 to 1,000%. Reset and Rate are adjustable
from 0.00 to 100 repeats per minute and 0.00 to 1,000 minutes,
respectively. 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. The additional
outputs are fully isolated from the inputs and the primary output
and are "floating" so they can have either a positive or negative
common.
Note: These isolated outputs are floating and require an external
24 VDC power source to operate. TI/AI can supply an
internal 24 VDC power supply to power these outputs.
Contact the factory for additional information.
• Alarm Relays: Up to six alarm or control relays are available for
the primary channel, or divided between the two channels on
dual output transmitters. Relay outputs can be field configured as
high or low alarms. Hysteresis (dead band) is defined by setting
the "ON" and "OFF" relay values. The relays can be configured
to any of the input parameters.
• HART Output: This option provides both digital and analog
outputs that is useful for monitoring and controlling process
variables in a multiple output instrument.
• Optional Software
Differential Output: Provides an output expressed as the
difference between two inputs.
Ratio Output: Provides an output expressed as the ratio of two
inputs. This is applicable to percent rejection in some
applications.
Averaged Output: Provides an output expressed as the average
of two inputs.
Introduction 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 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. The
keys are in two groups:
MENU SELECT: UP/DOWN (▲/▼) These keys are used to
change the display menu and move the cursor vertically. Any
menu can be accessed using the appropriate MENU SELECT key.
These keys are also used to exit the calibration mode and save
calibration data.
CALIBRATE KEYS: UP/DOWN/LEFT/RIGHT (▲/▼/◄/►)
The horizontal CALIBRATE keys are used to enter the calibrate
mode and move the cursor horizontally. To enter the calibrate
mode, both horizontal CALIBRATE keys must be pressed
simultaneously. Once in the calibrate mode, the cursor can be
positioned by pressing the appropriate individual CALIBRATE
key. These keys are also used to select an item from a menu. See
Section 3.1)
The vertical CALIBRATE keys are used to perform numeric
adjustments to displayed values. Pressing the ▲ CALIBRATE key
will increase the value; pressing the ▼ CALIBRATE key will
decrease the value.
Figure 1-1: LXT-220 Front Panel
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1.5 Internal Connections
All user connections are made inside the unit on removable terminal
blocks. Two conduit holes are provided on the NEMA-4X housing, one for
low level 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. These can be changed in the field if the
application prefers a different arrangement.
Figure 1-2: Internal Layout of the LXT-220 DO Controller
Introduction LXT-220 DO
Teledyne Analytical Instruments 18
Dissolved Oxygen Controller Installation
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Installation
Installation of the LXT-220 Controller involves:
• Unpacking the instrument
• Mounting
• Making Electrical Connections
• 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. If damage is noted, save
the shipping container as proof of mishandling for the carrier.
2. Check the contents of the shipping container with the items and
quantities shown on the packing list. Immediately report any
discrepancies to TI/TAI.
3. Save the original packing material until you are satisfied with the
contents. In the event the transmitter must be returned to the
factory, the packing material will allow you to properly ship it to
TI/TAI.
4. Familiarize yourself with the instrument before installation, and
follow proper installation and wiring procedures.
2.2 Mounting
Three typical installation configurations are available for the LXT220:
• Universal mounting plate
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