TEK-OX Oxygen Analyser User Manual
Contents
1. The words LOW BATT appear when the batteries need replacing After approx 5 minutes the unit will switch off However the analyser can be supplied on request with the auto switch off disabled Instruments with Auto switch off disabled will have a Green On Off button For those who would prefer a cable mounted sensor we can offer an extension cable that fits into the Tek Ox and allows the sensor to be connected externally onto the opposite end of the cable Please note the Tek Ox extension cable part number 9520001 is only manufactured upon request TEK Ox manual 1 06 doc 23 06 09 4 2 Setting Up the TEK OX Oxygen Analyser Upon receipt inspect the package and ensure you have the following items Packaging may change from that shown TEK OX Analyser Batteries MNI500 may already be installed Sensor R 17VAN may already be installed Quick start guide Carrying case Quick Ox or DINKIT Check the entire unit for damage If damaged do not use Notify the supplier or consult Vandagraph Ltd 3 Battery amp Sensor Installation or Replacement Remove the three screws on the base of the analyser and remove the compartment cover It is gasket sealed so after a period of time it may need firm pressure to remove Loosen the seal by moving the base from side to side Do not lever off with a tool Damage to the seal may result y x Two AA 1 5 volt Alkaline Batteries Type MN1500 LRG 1 5 or similar must be installed in t2. temperature The Flow divertor is a set of blades which divert the gas onto the sensor face The gas flow to the sensor is therefore turbulent ensuring a fast reading The tubing is added to prevent air being drawn into the Tee outlet and reducing the reading Any poor joints will create a venturi action and suck in air giving an inaccurate reading TEK Ox manual 1 06 doc 23 06 09 8 Continuous flowing gas will cool the system around the sensor The temperature compensation will start to counteract this and the steady reading will start to rise until the temperature gradient across the sensor reaches a steady state 11 Measurement of Oxygen using a Quick Ox Leave Flow divertor on Adjust Calibration Add The Quick Ox Wave through the Air Turn on the Gas to a gentle Mate the Quick Ox When the reading stops Flow to the cylinder outlet rising turn off cylinder 12 Other methods of measuring Holding the sensor or sensor Tee against the pillar valve or the mouthpiece of the demand valve are strongly discouraged These methods can allow high pressures into the sensor giving inaccurate high readings or can allow air to be drawn into the gas mixture giving inaccurate low readings Excessive pressure can permanently damage the sensor membrane 13 Sensor Failure All sensors have serial numbers and have a minimum 12 month warranty from date of purchase The Vandagraph Quality Assurance ISO9000 2003 ensures traceability
3. Contact your authorized distributor or Vandagraph for return instructions Proof of purchase from stockists and non UK distributors will be taken into account for sensors failing just outside of warranty period 14 Instrument Failure TEK Ox manual 1 06 doc 23 06 09 9 There are no user replaceable parts in the instrument except the batteries and the sensor The case has been sealed to retard water damage Contact your authorized distributor or Vandagraph direct for return instructions Vandagraph will require Serial Number and purchasing information or registration of product on the website 15 Storage of Sensors Sensors prefer a cool and damp environment Never Store sensors for long periods before use Subject sensors to high temperatures 1 e Car rear shelf Freeze sensors left in cars overnight Store in a sealed container as when they use up the oxygen they go to sleep and can take several hours to stabilise when put back into use Subject sensors to physical shocks Subject sensors to vacuum Submerge sensors in liquids Attempt to open a sensor NB Sensors deteriorate very slowly and near the end of their useful life may show a drift up or down soon after calibration Sensors should be checked periodically in 100 Oxygen 16 Pressure All galvanic Oxygen analysers measure the partial pressure and not the percentage of the gas they sense The only time these instruments can accurately read percentages is when the
4. Open or try to repair a leaking or broken sensor Immerse the sensor or instrument in any liquid Pass hot or cold gas mixtures over the sensor Expose the unit to radio short wave microwave X Ray other than baggage screening high frequency or electromagnetic radiation Use cleaning agents or liquids in the cable receptacles or around the battery compartment Place the unit in a water vapour saturated environment Expose the TEK OX or sensor to excessive sunlight Expose the TEK OX or sensor to temperatures greater than 40 C 106 F or less than 0 C 32 F Use if low battery indicator shows 22 Sensor Material Safety Data Sheet Product Identification Oxygen sensor Product Name Micro Fuel Cells R 17 VAN Manufacturer Teledyne Analytical Instruments Address 16830 Chestnut Street City of Industry CA 91749 Date Prepared or Last Revised 7 6 05 Emergency Phone Number 0101 818 961 9221 Physical and Chemical Data Chemical and Common Names Potassium Hydroxide KOH 15 w v Granular Lead Pb pure CAS Number KOH 1310 58 3 Pb 7439 92 1 KOH Pb Melting Point Range 1l0toO0C 328 C Boiling Point Range 100to 1ISC 1744 C Specific Gravity 1 09 20 C 11 34 pH gt gt gt 4 N A Solubility in Water Soluble Insoluble TEK Ox manual 1 06 doc 23 06 09 12 Percent Volatiles by Volume None N A Appearance and Odour Colourless Grey metal 23 Potential for fire and explosion The electrolyte in the Micro F
5. move from 21 For Oxygen mixtures above 50 always calibrate in 100 before measurement 10 Oxygen Measurement direct from a Pillar valve using a DINKIT The pressure restrictor DIN22F has a standard DIN fitting which can be used directly into a DIN pillar valve or into an A clamp with a DIN Female fitting The pillar valve should be opened slowly until the gas can just be heard hissing through the tubing Close the pillar valve after 5 seconds Watch the TEK OX reading it should rise and reach a stable level If it reaches a maximum and then falls back the cylinder has been opened too much creating a pressure on the sensor After the reading stabilizes about 5 seconds open valve again for 5 seconds as above The reading should this time peak and fall back less than 0 5 The stable reading is the oxygen level in the cylinder gas If in doubt this step can be repeated as many times as necessary until a stable reading is achieved If the system 1s left in this position air will gradually find its way back up the tubing and the reading will begin to fall very slowly The secret of accurate fast measurement is gently opening the pillar valve enough to obtain a gas flow of about 2 5 litres per minute a low level hiss without creating a high pressure on the sensor The pressure restrictor in conjunction with the pillar valve is used to achieve low flow rates of gas from the cylinder whilst the metal construction keeps the temperature nearer room
6. uk for further informationl Before replacing the screws ensure the gasket seal is free of dirt and dust and not jammed in between the enclosure and cover 5 The Flow divertor The Flow divertor is designed specifically to be used in conjunction with a Tee Piece or the Quick Ox gas sampling kit Flowing gas diverted onto the sensor face decreases the sensor response time Failure to remove the divertor and Tee when measuring static gas will severely increase the time the sensor takes to respond and can cause substantial inaccuracies In a stationary gas the Flow divertor traps the residual oxygen rich gas in the area just above the sensor membrane and severely slows down the ingress of fresh air into the sensor A sensor left in air with the Flow divertor in situ can take several minutes to return to 20 9 when removed from an Oxygen enriched gas Calibration will be inaccurate during this period 6 Calibration in Air Should be carried out at least every 8 hours and checked between measurements Routinely calibration in air 20 9 is suitable for mixtures less than 50 Oxygen Switch on the TEK OX Analyser Remove the Tee Piece but leave the Flow divertor on Move the analyser through the air slowly Adjust the Calibration control until the LCD reads 20 9 at sea level NB Altitude ambient pressure and humidity can all effect the accuracy of gas measurement Sensors deteriorate very slowly and near the end of their useful life may show a drift dow
7. TEK OX Oxygen Analyser User Manual These instructions should be read before using the TEK OX Mixed gas diving should only be undertaken by divers trained by a recognised training organisation TEK Ox Vandagraph Ltd 15 Station Road Crosshills Keighley West Yorkshire BD20 7DT United Kingdom Tel 01535 635900 Fax 01535 635582 www vandagraph co uk sales vandagraph co uk technical vandagraph co uk TEK Ox manual 1 06 doc 23 06 09 1 Thank you for purchasing the TEK OX If you have any comments or queries regarding any Vandagraph product including the TEK OX and sensors please contact us either by telephone Fax email or by visiting our website Warranty Vandagraph warranty ensures that goods are free from defects of manufacture for a period of one year from the date of shipment from Vandagraph Liability Shall be limited solely to the replacement and repair of the goods and shall not include shipping costs or other incidental costs This warranty is null and void if any items are subjected to misuse negligence accident or repairs other than those performed by Vandagraph or a Vandagraph authorised service centre Cables and transducers are not included Although every attempt has been made to ensure that the information contained in this document is correct Vandagraph Ltd accept no liability for errors or the misrepresentation of this material This analyser should only be used by trained and certified Nit
8. TEK OX to an oxygen cylinder an historic but still accurate method is to place the sensor without the Flow divertor in a plastic bag with small pin holes Ensure the neck of the bag is held loosely but closed Flush with 100 Oxygen via a small tube at a flow rate not exceeding 5 Litres minute a gentle stream of gas giving an audible hiss When the reading is steady set 100 with calibration control Flush several times to ensure all the air has been replaced When stable turn off Oxygen flow and set calibration to 100 TEK Ox manual 1 06 doc 23 06 09 7 Remove the sensor from the bag Blow gently over the sensor face The TEK OX reading should fall to about 17 due to the CO2 in breath add the Flow divertor and move through the air the reading should then settle at between 20 and 22 The CO2 in the breath helps to wash out the Oxygen If the sensor is outside the limits of 20 22 repeat the calibration If calibration is in a confined space ambient Oxygen levels may build up beyond 21 Check in fresh air Allow adequate ventilation in measuring area An alternative accurate method of measuring 100 Oxygen is to use the DINKIT part number 9730215 or the Quick Ox gas sampler part number 9730210 If sensor cannot be calibrated correctly do not use and consult your supplier Always calibrate in air prior to making a measurement as temperature changes and movement of the calibration control can all cause the calibration to accidentally
9. he TEK OX the correct way to enable it to operate Slide in the batteries in the correct way ve to ve ve to ve Follow Label directions Batteries must be replaced as soon as the battery symbol appears in the LCD window Accuracy of the TEK OX can not be guaranteed whilst the battery Lo symbol is visible 4 Sensor Installation or replacement An R 17VAN Sensor must be installed before the TEK OX will operate Remove the sensor from its protective bag and visually inspect the sensor for damage or electrolyte leakage Allow the sensor a few minutes to stabilize after installation TEK Ox manual 1 06 doc 23 06 09 5 Rotate the sensor in the enclosure Switch on The sensor should settle in a few minutes however at least 1 hour should be allowed for greatest accuracy Never use a defective or suspect sensor The R 17VAN sensor contains an electrolyte which is caustic Do not let the electrolyte come into contact with skin eyes or mouth If it does flush the affected area with fresh water See section 24 on First Aid Do not attempt to open or repair the sensor Leaking or exhausted sensors should be disposed of in accordance with local regulations which is usually similar to the disposal of batteries Consult the Material Safety Data Sheet Section 22 Vandagraph offer a Return to Vandagraph for correct disposal service which is free when you purchase a new sensor extended to all types of Galvanic sensor visit www Vandagraph co
10. n a problem Water ingress into the TEK OX can be assumed if any of the following are observed e Dampness in the battery compartment e Micro droplets in the LCD window e Mist in the LCD window e Battery goes flat prematurely 20 Discrepancy in readings against expected values The TEK OX is intended to be used only as a secondary means to verify the accuracy and check the concentration of oxygen in a pre mixed source Whenever a discrepancy of 1 or greater is observed between the calculated mix and the TEK OX the source of the discrepancy must be resolved immediately Check gas calculations Check method of preparation Check the TEK OX calibration both in air and 100 02 21 DO S and DON TS DO Read all of the directions before using for the first time Calibrate before use TEK Ox manual 1 06 doc 23 06 09 11 Keep the unit sensor and connections dry Calibrate after replacing the batteries Calibrate after replacing the sensor Check Calibration 20 9 in air before every reading Make sure the R 17VAN is properly seated in the TEK OX Visually inspect the sensor for leakage or water on the sensing surface before use Use the plastic Flow divertor when using the Tee Piece Remove the Flow divertor when measuring in static gas Clean the case with a damp cloth and mild detergent Remove the batteries prior to extended storage DON T Use the TEK OX if you suspect any malfunction Overheat or freeze the sensor
11. nwards or upwards soon after calibration Sensors should be checked periodically with 100 Oxygen If analysing Nitrox below 50 an air calibration is usually sufficient If Analysing mixtures above 50 e g decompression gases always calibrate to 100 oxygen 7 Effects of Altitude At very high altitudes some sensors with low outputs may not calibrate up to the level required At Altitude total pressure ambient and altitude must be taken into consideration For further information view Vandagraph website www vandagraph co uk TEK Ox manual 1 06 doc 23 06 09 6 N B The TEK OX measures partial pressure so will be affected by altitude and re compression chambers This table is a rule of thumb guide to the effect of pressure on Oxygen measurement Feet Metres Pressure mb Calibrate pp o G o 12 000 8660 P69 133 Values are for indication only For greater accuracy ambient pressure and correct altitude should be known 8 Effects of Humidity Although not substantial humidity can effect the maximum accuracy that can be obtained This accounts for the difference observed between ambient air calibration and calibration with dry gas from a cylinder __ RH40 RH60 RH80 RH100 _ 10 C 50 F 20 C 70 F 40 C 100 F Values are for indication only For greater accuracy ambient pressure and correct altitude should be known 9 100 Oxygen Calibration If problems are encountered connecting the
12. omiting Seek medical attention Inhalation Liquid inhalation is unlikely 25 Handling Information The Oxygen sensors are sealed and under normal circumstances the contents of the sensors do not present a health hazard The following information is given as a guide 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 TEK Ox manual 1 06 doc 23 06 09 13 26 Protective measures During sensor replacement Before opening the bag containing the sensor check the sensor for leakage If the sensor leaks do not open the bag If there is liquid around the sensor e g whilst in the instrument case put on gloves and eye protection before removing the sensor 27 Disposal Should be in accordance with all applicable state local and federal regulations NOTE The above information is derived from the MSDS provided The information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide Neither Teledyne Engineering nor Vandagraph Ltd shall be held liable for any damage resulting Vandagraph offer a Return to Vandagraph for correct disposal service which is free when you purchase a new sensor extended to all types of Galvanic sensor visit www Vandagraph co uk for further informationl 28 General Care of the TEK OX The TEK OX is a very acc
13. oxygen Dimensions Operai Top pae Waterproofing POS a EN 60601 1 2006 Copyright 2007 Vandagraph Ltd 15 Station Road Crosshills Keighley West Yorkshire BD20 7DT All worldwide rights reserved TEK Ox manual 1 06 doc 23 06 09 17
14. pressure is atmospheric 1 Bar and does not vary between calibration and measurement It is therefore important to calibrate the TEK OX at regular intervals It is recommended that the unit be calibrated prior to each use At sea level in air the partial pressure of Oxygen is approximately 0 21 and the percentage of Oxygen will therefore read approximately 21 If the sensor was subjected to 2 BAR pressure in air it would read 42 partial pressure 0 42 Bar Pressures of this magnitude may be experienced by the sensor if it is placed on the output of the pillar valve or mouthpiece and therefore facing into the gas flow If a container or bag is used to contain the gas to be measured it must have pin size vent holes and the pressure must be allowed to return to ambient before a measurement is made Wind increases pressure and if directed on to the sensor face during air calibration can cause erratic readings The TEK OX readings will be affected by altitude and re compression chambers See Altitude table in section 7 Altitude 17 Temperature The Vandagraph R 17VAN is a micro fuel cell and a galvanic electrochemical sensor It is sensitive to temperature changes A thermistor in the R 17VAN Oxygen sensor adjusts for ambient changes in the range 0 40 C 31 106F Cold gas from a cylinder directed at the face of TEK Ox manual 1 06 doc 23 06 09 10 the sensor will change the temperature and affect the accuracy of the reading Continuous flo
15. re each dive trip allowing time for a replacement to be obtained and always just prior to a measurement being taken The sensor can also be cleaned with warm water but care should be taken to follow the advice on page 11 concerning moisture Do not use excessive force to screw the sensor into the Flow divertor as damage can be caused to the threads TEK Ox manual 1 06 doc 23 06 09 14 30 Sensor Life The life of a sensor in the TEK OX depends on the amount of Oxygen to which it is exposed and is not affected by whether the TEK OX 1s switched on or off An R 17VAN will theoretically work for 36 48 months if left in air and 10 months if left in 100 O2 The sensor warranty is 12 months from the invoice date These expected life figures can be drastically shortened if the sensor is physically abused The sensor should be stored in the TEK OX 31 TEK OX Accuracy The readout device has a 0 1 resolution and can therefore only display with a maximum accuracy of 0 1 anywhere on the scale During Vandagraph quality control each TEK OX is tested for accuracy and linearity over the range 0 to 100 An insignificant error is involved in matching the temperature compensation network to the sensor output curve Most errors contributing to inaccuracy are user or environment induced e g temperature movement pressure or moisture If care is taken to observe the correct procedures during calibration and measurement an accurate calibration a
16. rox divers TEK Ox manual 1 06 doc 23 06 09 2 Contents Section Page Frontpage ft Register product Warranty o O o Contents BB 4 Sensor installation or replacement OB 5 Flow divertor o y 6 o 6 Calibration in air o y 6 o 7 ____ Effects of altitude 00 y 6 o 8 ___ Effects of humidity 2 O o 9 100 Oxygen Calibration 0000 O o 10 Measurement of oxygen using a DINKIT OB 11 Measurement of oxygen using a Quick Ox o oZ OoOo OOB o 12 Other methods of measurement Z oOZOoOoSoSS0 Do o 13 Sensor failure o OD o 14 instrument failure 000 OD o 1 0 Introduction The TEK OX Diving Oxygen Analyser has been designed to measure the Oxygen content in a variety of gas mixtures including Nitrox and Trimix incorporating the latest in state of the art technology It is recommended that the instrument only be used as a secondary measuring device to verify the concentration of Oxygen in gas mixtures prepared using recommended methods of mixing 1 e partial pressure blending molecular weight molecular sieve and continuous blending The TEK OX utilizes the Vandagraph R 17VAN Micro Fuel Cell which is a self contained galvanic cell requiring no routine maintenance The Liquid Crystal Display LCD provides TEK Ox manual 1 06 doc 23 06 09 3 an easy to read indication of the Oxygen content of the gas being monitored with a resolution of 0 1 There only two controls both can be operated with either hand On Off switch Calibration control
17. t 20 9 should give a maximum error of 0 5 in 100 Oxygen Readings below 21 will have an accuracy limited to the resolution of 0 1 The overall accuracy claimed is 1 of full scale Note that errors in calibration at 20 9 will be multiplied by 5 at 100 e g set 20 in air will cause 100 Oxygen to read 95 32 Trouble shooting pares ongvay o a disconnected a sensor whilst in the instrument There may be a deposit on the Jack plug or the sensor Jack socket Zero Reading Sensor exhausted Check sensor again in Air 20 9 20 9 eading drifts Up or Down _ Sensor nearly exhausted eading drifts Up Sensor in flowing gas to long eading drifts Temperature changing Check ambient temperature TEK Ox manual 1 06 doc 23 06 09 15 Reading drifts p and down on calibration Check for wind blowing on divertor Inaccurate reading Old sensor Change sensor Inaccurate reading RF Interference Move away from RF source Boat VHF radio Inaccurate reading High flow generated pressure Do not use flowing gas use On Off On Off system Inaccurate reading Condensation on sensor face Remove condensate 33 TEK OX Parts and accessories 710018 R 17VAN Micro Fuel Cell 730315 DINKIT Restricter Kit 9 9 0711001 _JA 268_Tee Adaptor 9711002 B 50057 Flow Divertor 9 9 9 710040 34 Specification TEK Ox manual 1 06 doc 23 06 09 16 Range sf 100 Oxygen ene xpected 36 48 months 10 months in 100
18. uel Cells is not flammable There are no fire or explosion hazards associated with Teledyne R17 sensors Potential for reactivity The sensors are stable under normal conditions of use Avoid contact between the sensor electrolyte and strong acids Health Hazard Data Primary route of entry Ingestion eye skin contact Exposure limits OSHA PEL 05 mg cu m Pb ACGIH TLV 2 mg cu m KOH Effects of over exposure Ingestion The electrolyte could be harmful or fatal if swallowed Oral LDS0 RAT 3650mg 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 sensation and or feel soapy or slippery to touch Medical conditions aggravated by exposure None Carcinogenity NTP Annual Report on Carcinogens Not Listed LARC Monographs Not Listed OSHA Not Listed Other health hazards Lead is listed as a chemical known to the State of California to cause birth defects or other reproductive harm 24 Emergency and First Aid Procedures Eye Contact Flush eyes with water for at least 15 minutes and get immediate medical attention Skin Contact Wash affected area with plenty of water and remove contaminated clothing If burning persists seek medical attention Ingestion Give plenty of cold water Do not induce v
19. urate instrument and if looked after will give many years of accurate Oxygen measurement There are very few parts that wear out except sensors and batteries The instrument is robust and designed to be used in the diving environment Although it is protected against water it should not be submerged or left in water or left outside unprotected against the weather On boats keep the TEK OX out of sea spray The instrument should be cleaned with warm soapy water not immersed No detergents or solvents should be used on the case or sensor Never use the TEK OX once the low battery indicator is visible from this point the electronics quickly become unstable and will give false readings Do not subject the TEK OX to mechanical shocks Although robust the LCD display is a glass component and can be broken This is usually apparent by black areas spreading across the LCD screen The TEK OX should be kept in a container when not in use and should be shielded from high and low temperatures Do not leave on the dashboard or rear window shelf of a car Protect the LCD from long periods of sunlight Good quality batteries should last at least one year Alkaline batteries are recommended because of their expected life discharge curves and overall reliability and stability Take care when changing the batteries amp sensor not to trap the seal in the battery cover 29 Care of the Sensor The sensor should be checked with an air calibration a week befo
20. wing gas will gradually cool down the sensor causing it to drift The temperature compensating circuit is in the base of the sensor so holding the sensor in the palm of a hand when using remote sensors can warm it up causing inaccuracy 18 Humidity Excessive moisture or condensation on the sensor surface will block diffusion of Oxygen to the sensor and render it inoperative In high humidity atmospheres hold the sensor facing down during calibration any droplets will have a chance to fall off the sensor membrane Using the restrictor method with air from a cylinder for calibration will allow the flowing dry gas to evaporate any moisture on the sensor face 19 Water amp Moisture Water in the sensor or the TEK OX can render the instrument inaccurate and cause irreparable damaged Sea water may dry leaving a deposit on the sensor membrane The instrument has been constructed to reduce the effects of water splashed onto it but 100 waterproofing is not guaranteed If the TEK OX is dropped in sea water quickly dry the case and shake to remove any water in the sensor As soon as possible wipe the wet area with fresh water and leave to dry Remove the battery and check for any water inside Remove the Flow divertor and check the sensor membrane If it is wet rinse with fresh water Remove excess water carefully with a paper tissue and leave to dry in a warm area Before use check sensor calibration in both air and 100 oxygen if moisture has bee
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