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AMI Analyzer Manual

Maintenance and troubleshooting 

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13

Sensor replacement cautions: 

CAUTION:  The sensor contains a caustic or acid liquid.  If there is any sign of a 

liquid in the cell compartment, do not allow it to come into contact with your 

skin.  If it does, immediately flush the affected area with water for a period of 

at least 15 minutes. Refer to the Material Safety Data Sheet provided. 

Dispose of leaking or used sensors in accordance with local regulations.  Sensors 

usually contain lead which is toxic, and should generally not be thrown into 

ordinary trash.  Refer to the MSDS to learn about potential hazards and 

corrective actions in case of any accident. 

Figure 4. Inserting sensor in cell block 

Sensor

Membrane 
Down

O ring

TAB

Sensor
Electrodes

Cell block
Electrodes

Cell block front

Summary of Contents for 201LC

Page 1: ...AMI Oxygen Analyzer Manual Model 201LC AMI Costa Mesa CA ...

Page 2: ...allation and Operation 4 Receiving the analyzer 4 Installation 4 Location 4 Connect gas and power lines 5 Interconnections 6 Alarm connections 6 Output connections 6 Serial connections 6 Sample Handling 7 Sensor Installation 8 Operation 8 General Description 8 Front Panel Controls 8 Output Ranges 8 View Output Range 8 Change Output Range 9 Alarm Set Points 9 View Alarm Set Points 9 Change Alarm Se...

Page 3: ...n applications 15 Specifications and Disclaimer 17 Specifications 17 Disclaimer 17 Material safety data sheets MSDS 18 Sensor type P2 T1 18 Product Identification 18 Physical and chemical data 18 Fire and explosion hazard data 19 Reactivity data 19 Health hazard data 20 Emergency and first aid procedures 21 Handling information 21 Sensor type T2 22 Product Identification 22 Physical and chemical d...

Page 4: ...rs are more advanced and have more features than competitive models Every effort is made to ensure that AMI products provide reliable effective performance However there are many pitfalls in achieving correct oxygen analysis particularly at low ppm levels and AMI stands ready to provide a complete solution to the analysis problem from sample system design to on site troubleshooting and problem ana...

Page 5: ...n 1 0 Features Compact size Unique patented cell block Auto ranging display with user selectable output range Front panel sensor access Optional air or span gas calibration no zero gases required Virtually unaffected by hydrocarbons or other oxidizable gases High accuracy and fast response Large liquid crystal display Backed by a two year warranty excluding sensor Standard isolated 4 20mA output T...

Page 6: ... of conventional sensors but without compromised come down time Sensor Warranty The sensor is warranted to operate for a period determined by its class If the sensor ceases to operate correctly before this time has elapsed contact AMI for a return authorization for evaluation If there is any evidence of defective material or workmanship the sensor will be replaced free of charge NOTE Any evidence ...

Page 7: ...le low oxygen level gas such as nitrogen or a low level span gas is ready to flow into it Installation Location The unit is designed to be mounted in a panel in a general purpose area It should be mounted at a suitable viewing level Refer to the drawing figure 1 showing the analyzer dimensions It is not suitable for use in a hazardous area or with flammable gases Although the unit is RFI protected...

Page 8: ... be provided by a user supplied valve Exhaust The exhaust line may be left open or vented to a suitable vent If used with a scavenging system use a large diameter pipe for example pipe as the input to the scavenging system and allow the vent to terminate a little way inside this larger line without sealing it The scavenging system will then draw in room air along with the sample while leaving the ...

Page 9: ... The contacts can handle AC or DC voltages and can carry up to 5A of current for a resistive load Inductive loads such as solenoid valves should be snubbed we suggest that you connect diodes or Zener diodes or Transzorbs directly across them to absorb the inductive spike Do not connect them across the relay terminals on the analyzer since the resultant current loop will transmit a lot of RFI that ...

Page 10: ...essure within this range Higher pressure applications or varying pressure applications will need a regulator to control pressure The analyzer is not sensitive to flow changes between about 0 2SCFH and 5 SCFH but it is sensitive to back pressure changes changes in exhaust pressure The flowmeter is mounted on the exhaust so that the oxygen reading is not affected by potential leaks around the flowme...

Page 11: ...ion ADC to measure the oxygen signal as well as a temperature signal Since it is so precise it measures the full range of oxygen values with no gain change required Front Panel Controls The controls all work the same way You press the function you want for a second and let go and the display will show the value corresponding to that function for about 3 seconds For example if you press the OUTPUT ...

Page 12: ...let go While the alarm set point is showing press either the UP or DOWN arrow button and hold it until the value is what you want The numbers will scroll slowly at first and then speed up if you press the other button or release and re press the one you are using the number will start going slowly again Alarm Hold Off Press the ALARM HOLD OFF button for a second and release it The display will sho...

Page 13: ...an gas value for more than a few hours this step is unnecessary The idea is to make sure that any dissolved oxygen left in the sensor has had a chance to be depleted 2 Using an external selection valve introduce a span gas into the cell compartment Flow it at 1SCFH or at any rate the same flow as the sample gas 3 Allow the reading to stabilize This will take only a minute or so but you may want to...

Page 14: ... suddenly jumps it indicates that the sensor is getting close to the end of its life Read the Temperature Press the DOWN arrow button The display will show the temperature of the cell block in degrees Fahrenheit The value is limited to 25F at the lowest and about 120F at the highest Values outside this range will damage the sensor Alarm Functionality The model 201LC series has two alarms with two ...

Page 15: ...r month so a monthly calibration is usually satisfactory Use in a particularly aggressive environment may degrade the sensor faster in this case calibrate more often Sensor Replacement This should be done based on the Span Factor feature rather than as a response to a dead sensor See the chart below for recommended sensor replacement Sensor Part number Description Expected life P2 4SEN03 1 0 50 Pe...

Page 16: ...with water for a period of at least 15 minutes Refer to the Material Safety Data Sheet provided Dispose of leaking or used sensors in accordance with local regulations Sensors usually contain lead which is toxic and should generally not be thrown into ordinary trash Refer to the MSDS to learn about potential hazards and corrective actions in case of any accident Figure 4 Inserting sensor in cell b...

Page 17: ...In the rare event that the sensor has leaked there will be liquid in the bag If so do not proceed you need a new sensor Be careful that you don t poke anything such as a fingernail through the membrane 8 Don t pull out the shorting tab yet 9 Holding the sensor by its tab membrane side down slide it into the cell block gold plated contact side of sensor should be facing up touching the cell block c...

Page 18: ...heck all the fittings back to the gas source 3 Leak test all external fittings with Snoop soap solution or equivalent 4 Verify that the gas flow rate is correct 0 1 to 2 SCFH 5 Oxygen diffusion can be a serious problem Verify that no plastic tubing or other plastic components are used in a trace gas system including diaphragms of pressure regulators packing of valves etc For percent applications s...

Page 19: ... sensor replacement instructions under Maintenance No voltage or current output to recording device 1 Verify that the output wires are properly stripped and connected 2 Verify the connections on the output terminal block 3 Verify that the output connections are not shorted all the way back to the recording device Disconnect the wires from the analyzer and use an ohmmeter to check for shorts or ope...

Page 20: ... 117VAC 5A or 28VDC 5A resistive Power requirements 24VDC 10W Absolute Maximum Power voltage 28VDC Overall dimensions 9 w x 95 h x 3 d Mounting hole dimensions 7 92 w x 4 81 h Weight 5 lbs Disclaimer Although every effort has been made to assure that the AMI analyzers meet all their performance specifications AMI takes no responsibility for any losses incurred by reason of the failure of its analy...

Page 21: ...uments Address Phone 714 848 5533 Date of last revision 11 08 2004 Emergency phone number 714 848 5533 Physical and chemical data Composition The sensor body is made of metal and glass epoxy GR4 circuit board material with a Mylar covering It contains the following substances Common name Formula Concentration CAS number Potassium hydroxide solution 15 KOH 15 1 5ml 1310 58 3 Lead Pb pure 3 20 g 743...

Page 22: ... N A Flammable limit N A LEL N A UEL N A Extinguishing media No special agents recommended Special fire fighting equipment Wear NIOSH OSHA approved self contained breathing apparatus and protective clothing to prevent contact with skin and eyes Unusual fire and explosion hazards Emits toxic fumes under fire conditions Reactivity data Stability Stable Incompatibilities Aluminum organic materials ac...

Page 23: ...tion Inhalation of the electrolyte will cause severe irritation and chemical burns Signs symptoms of exposure The electrolyte is harmful if swallowed inhaled or absorbed through the skin It is extremely destructive to the mucous membranes stomach mouth upper respiratory tract eyes and skin The lead will lead to symptoms such as loss of sleep loss of appetite metallic taste and fatigue Medical cond...

Page 24: ...ical splash goggles Clean up procedures Wipe down the area several times with a wet paper towel using a fresh towel each time Protective measures during cell replacement Before opening the bag containing the sensor check the sensor for leakage If any is found do not open the bag If there is liquid around the sensor installed in the instrument put on gloves and eye protection before removing it Dis...

Page 25: ...8 5533 Date of last revision 11 08 2004 Emergency phone number 714 848 5533 Physical and chemical data Composition The sensor body is made of metal and glass epoxy GR4 circuit board material with a Mylar covering It contains the following substances Common name Formula Concentration CAS number Acetic acid HC2H3O2 5 w v 64 19 7 Potassium acetate KC2H3O2 5 w v 127 08 2 Lead Pb Pure 7439 92 1 ...

Page 26: ...ce and odor Clear colorless solution with a strong vinegar like odor odorless gray metal Odorless large white melting crystal Flash point 40 C N A N A Auto ignition temperature 427 C N A N A Physical hazards Potential for fire and explosion The contents of the sensor are not flammable There are no fire or explosion hazards associated with the sensor Potential for reactivity The sensor is stable un...

Page 27: ... eyes will cause a burning sensation Medical conditions aggravated by exposure Persons with pre existing skin disorders eye conditions or impaired respiratory function may be more susceptible to these substances Carcinogenity IARC lead is classified as a class 2B carcinogen possibly carcinogenic to humans Other health hazards Lead is a chemical known to the State of California to cause birth defec...

Page 28: ...re opening the bag containing the sensor check the sensor for leakage If any is found do not open the bag If there is liquid around the sensor installed in the instrument put on gloves and eye protection before removing it Disposal Must be in accordance with all applicable federal state and local regulations EPA waste number D008 California waste number 181 DOT information RQ Hazardous Waste Solid...

Page 29: ...emical A type of chemical reaction which produces an electrical current as part of the reaction In this case the oxygen sensors produce an electrical current in proportion to the amount of oxygen present at their membrane surface LCD Liquid Crystal Display a form of digital display suitable for reading in bright light conditions The display degrades below about 20C and above about 60C Membrane A t...

Page 30: ...d as 10 of the final level This is also called the t90 time The transit time of the gas is not included in this measurement RFI Radio Frequency Interference All analog circuits are prone to interference from high level radio frequencies and special precautions must be taken to prevent this The quality of such design is referred to by the acronym EMC or electromagnetic compatibility the property of...

Page 31: ...ation location 4 Instrument Warranty 3 Interconnections 6 Introduction 2 Maintenance 12 No output alarm indication 16 No voltage or current output to recording device 16 O rings 14 Output connections 6 Output Ranges 8 Oxygen sensor 3 Periodic Calibration 12 Read the temperature 11 Receiving the analyzer 4 Sample Handling 2001R 7 Sensor Installation 8 Sensor Replacement 12 Sensor replacement proced...

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