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Trace Oxygen Analyzer 

Operational Theory 

 

 

Teledyne Analytical Instruments  

11 

 

 

 

The output from the temperature compensation amplifier is sent to 

an analog to digital converter (ADC), and the resulting digital 
concentration signal is sent to the microcontroller. 

The digital concentration signal along with input from the front 

panel buttons (KEYBOARD) is processed by the microcontroller, and 
appropriate output signals are directed to the display and alarm relays.  
The same digital information is also sent to a 12-bit digital to analog 
converter (DAC) that produces the 0-10 V dc analog concentration 
signal and the 0-10 V dc analog range ID output. A voltage current 
converter (E–I CONV) produces the 4-20 mA dc analog concentration 
signal. 

Summary of Contents for 3300TB

Page 1: ...IONS FOR MODEL 3300TB Trace Oxygen Analyzer P N M70362 1 25 18 Use and Disclosure of Data Information contained herein is classified as EAR99 under the U S Export Administration Regulations Export reexport or diversion contrary to U S law is prohibited ...

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Page 5: ... 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 ...

Page 6: ...t for which this manual is supplied are indicated by a check mark in the box Instrument Serial Number _______________________ Options Included in the Instrument with the Above Serial Number Auto Calibration Valves Three gas inputs for sample zero and span gases with three solenoid actuated gas flow control valves built in Valves are automatically synchronized to the analyzer s electronic control s...

Page 7: ... are used throughout the Instruction Manual These symbols are visual indicators of important and immediate warnings and when you must exercise CAUTION while operating the instrument See also the Safety Information on the next page STAND BY Instrument is on Stand by but circuit is active GROUND Protective Earth CAUTION The operator needs to refer to the manual for further information Failure to do ...

Page 8: ...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 ...

Page 9: ...your new analyzer 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 M...

Page 10: ...tomer should ensure that the principles of operation of 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 no responsibility by Teledyne its affiliates and agents for damage...

Page 11: ...2 2 Anatomy of a Micro Fuel Cell 6 2 2 3 Electrochemical Reactions 7 2 2 4 The Effect of Pressure 8 2 2 5 Calibration Characteristics 8 2 3 Electronics 9 2 3 1 General 9 2 3 2 Signal Processing 10 Installation 13 3 1 Unpacking the Analyzer 13 3 2 Location and Mounting 14 3 2 1 Control Unit Installation 14 3 2 2 Installing the Micro Fuel Cell Cell Block Orientation 14 3 3 Electrical Connections 15 ...

Page 12: ...24 4 6 Calibration 25 4 7 Displaying Percent PPM on the LED Display 26 4 8 Supplementary Information 26 Maintenance 27 5 1 Replacing the Fuse 27 5 2 Sensor Installation or Replacement 28 5 2 1 When to Replace a Sensor 28 5 2 2 Ordering and Handling of Spare Sensors 29 5 2 3 Removing the Micro Fuel Cell 29 5 2 4 Installing a Micro Fuel Cell 31 5 2 5 Cell Warranty Conditions 31 Appendix 33 A 1 Model...

Page 13: ...racteristic Input Output Curve for a Micro Fuel Cell 9 Figure 2 3 Block Diagram of the Signal Processing Electronics 10 Figure 3 1 Electrical Connectors for AC Control Unit 15 Figure 3 2 Contact ID for FAILSAFE Relay Operation 17 Figure 3 4 Piping Diagram for Vacuum Service Option 19 Figure 4 1 Front Panel Controls and Indicators 21 Figure 5 1 AC Fuse Replacement 27 Figure 5 2 Exploded View of MFC...

Page 14: ...d yet simple to use The main features of the analyzer include High resolution accurate readings of oxygen content from 0 10 ppm through 9999 ppm with a large bright meter readout Simple push button controls Nylon cell holder Advanced Micro Fuel Cell for trace analysis Has six months warranty and an expected lifetime of eight months Unaffected by oxidizable gases Fast response and recovery time Mic...

Page 15: ...unted NEMA 4 rated enclosure RS 232 Serial Digital port for output of concentration and data to computer terminals or other digital devices A Sample flow control valve 1 3 Front panel Description All controls except the power switch are accessible from the door and gas panel See Figure1 1 Thefront panel has seven push button membrane switches a digital meter and an alarm indicator LED for operatin...

Page 16: ...upwards as they are displayed on the LED readout Down Arrow Increment values of parameters downwards as they are displayed on the LED readout Digital LED Readout The digital display is a LED device that produces large bright 7 segment numbers that are legible in any lighting environment It has two functions Meter Readout As the meter readout it displays the oxygen concentration currently being mea...

Page 17: ...dc concentration output 0 10 V dc range ID or optional over range output 4 20 mA dc concentration output negative ground Alarm Connections Alarm 1 Alarm 2 and Sensor Failure Alarm connections Sensor Connector Internal Sampling System Sensor Connector RS 232 Port Serial Digital Output of concentration and range signals Figure 1 2 Rear Panel ...

Page 18: ...rocessing input output and display functions for the analyzer 2 2 Micro Fuel Cell Sensor 2 2 1 Principles of Operation The oxygen sensor used in the Model 3300TB series is a Micro Fuel Cell designed and manufactured by Analytical Instruments It is a sealed plastic disposable electrochemical transducer The active components of the Micro Fuel Cell are a cathode an anode and the 15 aqueous KOH electr...

Page 19: ...any environment or sample stream It is effectively sealed although one end is permeable to oxygen in the sample gas The other end of the cell is a contact plate consisting of two concentric foil rings The rings mate with spring loaded contacts in the sensor block assembly and provide the electrical connection to the rest of the analyzer Figure 2 1 illustrates the external features Figure 2 1 Micro...

Page 20: ...oper position keeping the electrical output constant The entire space between the diffusion membrane above the cathode and the flexible rear membrane beneath the anode is filled with electrolyte Cathode and anode are submerged in this common pool They each have a conductor connecting them to one of the external contact rings on the contact plate which is on the bottom of the cell 2 2 3 Electrochem...

Page 21: ... cell under constant pressure If the total pressure increases the rate that oxygen reaches the cathode through the diffusing membrane will also increase The electron transfer and therefore the external current will increase even though the oxygen concentration of the sample has not changed It is therefore important that the sample pressure at the fuel cell usually vent pressure remain relatively c...

Page 22: ...ng uses an Intel microcontroller with on board RAM and ROM to control all signal processing input output and display functions for the analyzer System power is supplied from a universal power supply module designed to be compatible with most international power sources The power supply circuitry is on the Power Supply PCB which is mounted vertically just behind the rear panel of the Control Unit T...

Page 23: ...Block Diagram of the Signal Processing Electronics In the presence of oxygen the cell generates a current The sensor has an internal thermistor compensation network The output of the sensor is converted to voltage millivolt range This output is fed to a voltage amplifier The internal thermistor network provides temperature compensation of the sensor output The resistance of the network changes wit...

Page 24: ...ital concentration signal along with input from the front panel buttons KEYBOARD is processed by the microcontroller and appropriate output signals are directed to the display and alarm relays The same digital information is also sent to a 12 bit digital to analog converter DAC that produces the 0 10 V dc analog concentration signal and the 0 10 V dc analog range ID output A voltage current conver...

Page 25: ...Operational Theory Model 3300TB Teledyne Analytical Instruments 12 Blank Page ...

Page 26: ...to open it Leaking or exhausted cells should be disposed of in accordance with local regulations Refer to the Material Safety Data Sheet in the Appendix Any damage or scarring of the delicate permeable membrane on the sensing end of the cell will require cell replacement Prevent contact with membrane by any solid object 3 1 Unpacking the Analyzer As soon as you receive the instrument carefully unp...

Page 27: ...uld be installed at viewing level in a sheltered area Refer to the Outline diagram D 70361 for the physical dimensions of the analyzer 3 2 2 Installing the Micro Fuel Cell Cell Block Orientation A Micro Fuel Cell is included as a separate item It must be installed prior to instrument use Also once it is expended or if the instrument has been idle for a lengthy period the Micro Fuel Cell will need ...

Page 28: ...Micro Fuel Cell follow the procedures in Chapter 5 Maintenance 3 3 Electrical Connections Figure 3 1 shows the Model 3300TB rear panel of the control unit For detailed pinouts see the wiring interconnection drawings in the Drawings section at the rear of this manual To gain access to the terminal blocks the analyzer door screws must be loosened and the door opened Figure 3 1 Electrical Connectors ...

Page 29: ...ith the polarity noted See Figure 3 3 The outputs are 0 10 V Range Voltage rises with increasing oxygen concentration from 0 V at 0 percent oxygen to 10 V at full scale percent oxygen Full scale 100 of programmed range 0 10 V Range ID 03 33 V Low Range 06 66 V High Range 10 V Air Cal Range 4 20 mA Range Current increases with increasing oxygen concentration from 4 mA at 0 percent oxygen to 20 mA a...

Page 30: ...larm 2 can both be configured as either HI or LO A HI alarm will activate when concentration is above threshold while a LO alarm will activate concentration is below threshold Figure 3 2 Contact ID for FAILSAFE Relay Operation The specific descriptions for each type of alarm are as follows Alarm 1 Programmable as high or low alarm actuates when concentration is above threshold Can be set anywhere ...

Page 31: ...the sensor and altering the O2 reading The pressure required will depend on the sampling system When venting into a constant pressure such as the atmosphere controlling input pressure is simple If you are venting into a system of varying pressure then some form of pressure regulation is required to maintain a constant pressure across the sensor The Sample and Span pressure is not to exceed 50 psig...

Page 32: ...pan and Sample gas are at different pressures The calibration accuracy will be adversely affected if the Span and Sample gases are at differing pressures If the span gas is provided from pressurized source a control valve must be added between the analyzer and the span gas source This valve is used to adjust the span flow rate to match the sample flow rate Do not adjust the span flow rate with the...

Page 33: ...alytical Instruments 20 Set the sample pressure to 5 10 psig 34 5 68 9 kPa nominal for non vacuum service units Set the flow Once the above checks have been made you can connect to the power source The instrument is now ready for operation ...

Page 34: ...olves setting the system parameters Defining the user selectable analysis ranges Setting alarm setpoints Calibrating the instrument All of these functions are performed via the front panel controls shown in Figure 4 1 Analyzing for the trace oxygen level in the gas passing through the cell block is the default mode of operation As long as no front panel buttons are being pressed the Unit is analyz...

Page 35: ...nts the displayed value upwards Increments the displayed value downwards Any of the functions can be selected at any time by holding down the appropriate button Each function will be described in the following sections Although the operator can use any function at any time the order chosen in this manual is appropriate for an initial setup 4 3 Setting the Analysis Ranges The two user definable ana...

Page 36: ...tion 4 4 Setting the Alarm Setpoints The alarm setpoints can be adjusted over the full range of the analyzer 0 9999 ppm oxygen content The set point values are expressed in ppm only 4 4 1 Set Alarm 1 Alarm 1 can be set either as a high or low alarm To configure this alarm to your preferences 1 Press the SET ALARM 1 function button once 2 The display will flash either HI or LO depending on what the...

Page 37: ...ds no key is pressed the instrument will return to the sample mode and display oxygen concentration 3 To change the setting at which the alarm will be actuated press the SET ALARM 2 function button once more The alarm setpoint will flash on the LED display Press either the Up or Down keys to raise or lower the displayed value as required until the display reads the desired percent concentration if...

Page 38: ... to ambient air or instrument grade air 20 9 oxygen Allow time for the sampling system to purge and the analyzer to achieve equilibrium Note If the analyzer output goes above the high alarm setpoint or below the low alarm setpoint the display will go blank and the front panel ALARM Indicator beneath the SET Function buttons will blink Hold down the SPAN button until the ALARM Indicator stops blink...

Page 39: ... analisis or you can press the UP button and then the DOWN button Pressing the UP and DOWN buttons causes the analyzer to time out in five seconds instead of five minutes If during the span procedure you press the RANGE or ALARM buttons either the range or alarm routine will be activated any changes to span will be rejected the 60 second alarm delay will not occur i e the alarms will be responsive...

Page 40: ...n as described in chapter 4 Operation 5 1 Replacing the Fuse CAUTION Remove power to the unit before replacing the fuse When a fuse blows check first to determine the cause then replace the fuse using the following procedure 1 Disconnect the AC power and place the power switch located on the rear panel in the O position Remove the power cord from the receptacle 2 The fuse receptacle is located in ...

Page 41: ...ter Large zero offsets will result in inaccurate SPAN settings To test for this condition purge the sensor and sample system with ZERO gas typically nitrogen with less than 1 ppm O2 It may take several hours for the sample system and cell to return to a stable low level of O2 if it has been exposed to higher levels of O2 If the instrument will not come down to an acceptably low reading on zero gas...

Page 42: ...il the cell is to actually be used If the cell package is punctured and air is permitted to enter cell life will be compromised WARNING THE SENSOR USED IN THE MODEL 3300TB CONTAINS AN ELECTROLYTE WHICH INCLUDES SUBSTANCES THAT ARE EXTREMELY HARMFUL IF TOUCHED SWALLOWED OR INHALED AVOID CONTACT WITH ANY FLUID OR POWDER IN OR AROUND THE UNIT WHAT MAY APPEAR TO BE PLAIN WATER COULD CONTAIN ONE OF THE...

Page 43: ...k 4 Slowly withdraw the cap from the block The cell should come out with the cap 5 Carefully pull the cell off of the cap DO NOT TOUCH THE SCREENED END OF THE CELL OR ANY FLUID THAT MAY BE LEAKING FROM IT 6 Dispose of the cell in a safe manner in accordance with all applicable ENVIRONMENTAL AND SAFETY laws ...

Page 44: ...ical connector plug 5 2 5 Cell Warranty Conditions The B 2C Class Micro Fuel cell is used in the Model 3300TB These cells are warranted for 6 months with an expected life of 8 months from the date of shipment under specified operating conditions see Appendix Note any Addenda attached to the front of this manual for special information applying to your instrument Note that the warranty period begin...

Page 45: ...Maintenance Model 3300TB Teledyne Analytical Instruments 32 ...

Page 46: ...igh alarm relay adjustable one low alarm relay adjustable one sensor failure relay All are failsafe System Operating Temp 0 50 C Accuracy 2 of full scale at constant temperature 5 of full scale through operating temperature range At 100 ppm and higher user defined ranges once temperature equilibrium is reached 1 ppm for 10 ppm range under above conditions Response Time 90 in less than 65 seconds a...

Page 47: ...art number if available and the model and serial number of the instrument for which the parts are intended Orders should be sent to TELEDYNE Analytical Instruments 16830 Chestnut Street City of Industry CA 91748 Phone 626 934 1500 Fax 626 961 2538 Web www teledyne ai com or your local representative A 3 Drawing List D70361 Outline Drawing D70362 Final Assembly Note The MSDS on this material is ava...

Page 48: ...Industry CA 91749 Phone 626 961 9221 Technical Support 626 934 1673 Environment Health and Safety 626 934 1592 Date Prepared 11 23 98 Section II Physical and Chemical Data Chemical and Common Names Potassium Hydroxide KOH 15 w v Lead Pb pure CAS Number KOH 1310 58 3 Pb 7439 92 1 KOH 15 w v Pb pure Melting Point Range 10 to 0 C 328 C Boiling Point Range 100 to 115 C 1744 C Specific Gravity 1 09 20 ...

Page 49: ...KOH Effects of overexposure Ingestion The electrolyte could be harmful or fatal if swallowed Oral LD50 RAT 3650 mg kg Eye The electrolyte is corrosive eye contact could result in permanent loss of vision Dermal The electrolyte is corrosive skin contact could result in a chemical burn Inhalation Liquid inhalation is unlikely Signs symptoms of exposure Contact with skin or eyes will cause a burning ...

Page 50: ...ide in the event that a cell leaks Protective clothing Rubber gloves chemical splash goggles Clean up procedures Wipe down the area several times with a wet paper towel Use a fresh towel each time Protective measures during cell replacement Before opening the bag containing the sensor cell check the sensor cell for leakage If the sensor cell leaks do not open the bag If there is liquid around the ...

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