Analox HYP O2 Portable - User Manual
Contents
1. Copyright 1996 Analox Ltd Stokesley UK All worldwide rights reserved Table 4 in bar for given O at various atmospheric pressures Atmospheric pressure bar 0 94 0 96 0 98 1 00 1 02 1 04 1 06 9602 19 0 0 18 0 18 0 19 0 19 0 19 0 20 0 20 19 1 0 18 0 18 0 19 0 19 0 19 0 20 0 20 19 2 0 18 0 18 0 19 0 19 0 20 0 20 0 20 19 3 0 18 0 19 0 19 0 19 0 20 0 20 0 20 19 4 0 18 0 19 0 19 0 19 0 20 0 20 0 21 19 5 0 18 0 19 0 19 0 20 0 20 0 20 0 21 19 6 0 18 0 19 0 19 0 20 0 20 0 20 0 21 19 7 0 19 0 19 0 19 0 20 0 20 0 20 0 21 19 8 0 19 0 19 0 19 0 20 0 20 0 21 0 21 19 9 0 19 0 19 0 20 0 20 0 20 0 21 0 21 20 0 0 19 0 19 0 20 0 20 0 20 0 21 0 21 20 1 0 19 0 19 0 20 0 20 0 21 0 21 0 21 20 2 0 19 0 19 0 20 0 20 0 21 0 21 0 21 20 3 0 19 0 19 0 20 0 20 0 21 0 21 0 22 20 4 0 19 0 20 0 20 0 20 0 21 0 21 0 22 20 5 0 19 0 20 0 20 0 21 0 21 0 21 0 22 20 6 0 19 0 20 0 20 0 21 0 21 0 21 0 22 20 7 0 19 0 20 0 20 0 21 0 21 0 22 0 22 20 8 0 20 0 20 0 20 0 21 0 21 0 22 0 22 20 9 0 20 0 20 0 20 0 21 0 21 0 22 0 22 Document Ref MO2 850 00 January 2013 NA LO HYP O2 Portable User Manual 4 5 Calibration using calibration gas SAFETY WARNING It is assumed that personnel using this procedure have been trained in the safe use of gas and associated equipment gas bottles regulators etc Do not use high pressure2. HYP O2 Portable User Manual Analox Ltd 15 Ellerbeck Court Stokesley Business Park North Yorkshire TS9 5PT UK T 44 0 1642 711400 F 44 0 1642 713900 W www analox net E info analox net List of Contents 1 AAAS EE age EE A 2 OVOIVIOW eebe geed e 5 3 Bere AE Ee 6 3 1 Switching on and ot iesse ien nolo pae e lar RR 6 3 2 Ambient Local atmosphere monitoring eene 6 3 3 Hemote monitoririg is ette eee lb oa Rr ER Aes 6 3 4 Low battery warning ze o ER PRU NRI 6 3 5 Note on partial pressure measurements nennen 7 3 6 Conversion of partial pressure measurement to a percentage measurement 9 3 7 Concerned whether reading is accurate eee 10 3 8 Effect of temperature changes AA 10 3 9 Rapid changes of Dressure 10 3 10 Effect of humidity acere ENEE ENEE p ec oed ze ipe cod RR 11 4 Calibration det a wate boi dd HE AC En aa EL Ue D lien 12 4 1 Frequency of check calibration sese enne 12 4 2 Type of calibratiori ne es sn 13 4 3 Air calibration using fresh air without temperature or humidity compensation 14 4 4 Air calibration using fresh air with temperature and humidity compensation 14 4 5 Calibration using calibration gas 16 4 6 Calibration using pure oxvvgden nn 17 4 7 Calibration against a reference anahvser 18 5 Maintenances eden retina eed tco et od aed Gat eb
3. a gain error of approximately 696 of reading on all subsequent oxygen readings Conversely if the same calibration were performed at 2096 relative humidity and 10 C then the oxygen content should be assumed as 20 8 rather than 20 9 However failure to account for the humidity in this example would result in a gain error of approximately 0 596 of reading which to all intents and purposes will usually be insignificant Document Ref MO2 850 00 January 2013 NALO HYP O2 Portable User Manual 4 Calibration 4 1 Frequency of check calibration The analyser must be calibrated in order to provide accurate oxygen measurement The analyser is calibrated at the factory immediately prior to shipping The oxygen sensor used inside the analyser degrades as it is consumed over its approximate 3 year life This characteristic makes it important to periodically calibrate the sensor to compensate for the slow degradation taking place and hence maintain the analyser in a condition where it will provide adequate measurement accuracy The typical degradation is a decline of approximately 5 of reading per year So an analyser reading 0 21bar immediately after calibration might be expected to read 0 20bar one year later in exactly the same conditions oxygen temperature and pressure This has to be quantified against the users requirements for how accurately the measurements are to be made Calibrating every 6 months would reduce the typical e
4. exercised that condensed water is not allowed to settle in the gas inlet port A layer of water will block gas diffusion into the sensor In practice this problem is easily overcome Simply holding or mounting the analyser in a vertical rather than horizontal position will mean that any water collecting in the sensor inlet will simply run off the sensor So does humidity affect the reading As an analyser measuring partial pressure of oxygen the answer is effectively no However in many cases the analyser may be used to measure atmospheres that are regarded as being air Care has to be exercised here since in air as the humidity increases it displaces nitrogen and oxygen and any other more minor constituents Therefore if at the time of calibration calibration in air only you have not accounted for humidity then there may be a problem with the later oxygen readings The effect is greatest for high levels of humidity at high temperatures At low temperature or humidity the effect is virtually insignificant As an example if the analyser were calibrated at 38 C and a relative humidity of 90 as per Section 4 4 then the actual percentage of oxygen in a fresh air environment will be 19 796 If the pressure is 1bar then the partial pressure to which the analyser should be adjusted will be 0 20bar Ignoring humidity the user may have assumed that the analyser should be calibrated to 20 996 of 1bar 0 20bar This would result in
5. from the reading of partial pressure the user will need to know the actual pressure in the location at which the measurement has been taken So if the reading on the analyser is R bar ppOs and the actual pressure is Known to be P bar absolute then the 0 100xR P Table 2 may be used to do this calculation Note the blank part of the table which shows that the ppO cannot exceed the actual pressure Table 2 Calculate O from ppO and Pressure in bar ppo2 ba o 0 o2o oso o4o o so 060 0 90 100 110 12 130 140 150 16 170 180 190 200 aar aef mal ers eal rial real ser oa DEZ HEET sal an 35 RER f zo sa sa 42 3 27 a 2s 21 DER CEET TET 68 61 8 gt 5 jjs o to a o 5 65 915 53121213 t 72 2 65 0 43 3 32 5 26 0 21 7 18 6 16 14 4 134 8 o a eof aa a ezl enol sar asof 75 500 esp na UNE NEC Ca H aa a CECR 36 7 27 221 18 15 a D 32 0 26 7 m Njo 2 5 a ojo Ss ole alelalslelale ls oj c Ie As 14 12 11 17 to w co N B a o alo a a jojn N gt wo nfo Ao Sjela lalala SIS 20 14 11 10 0 1 ple lieft o o o n o o w e e Fa bal bad ba d o o c o wlofo s N D o o 12 ola je 3 2 8 E EJ in o o o
6. the atmosphere to carry more water vapour then the actual amount of oxygen in the atmosphere is diluted This can be accounted for but to be done properly does require knowledge of both temperature and relative humidity It is also possible to use a calibration gas say calibration air This overcomes the humidity problem since the calibration gas will be dry The problem with 20 9 calibration gas is that it s accuracy at best is 1 of reading and generally 2 or even 5 for some suppliers So with a 1 accurate cal gas a 20 9 oxygen may be anything from 20 7 up to 21 1 and a 2 accurate cal gas anything from 20 5 up to 21 396 and a 5 accurate cal gas anything from 18 9 up to 21 9 If you calibrate with say the 5 accurate gas and leave a residual error of 1 oxygen at an air concentration you will find that if you then subject the sensor to pure oxygen 5 times the concentration the error will have increased to 5 oxygen So you may believe by measurement that you are breathing 95 oxygen when in fact it is perfectly pure By calibrating with pure oxygen we overcome all of these problems Firstly pure oxygen calibration gas can be obtained to a degree of accuracy well beyond what the sensor can measure You could use zero grade oxygen which is generally specified to be at least 99 5 pure or you could go further and purchase oxygen with a purity of 99 995 which in honesty is not generally worth the extra cost for this particul
7. 11 39 29 19 13 10 7 5 4 3 2 8 51 38 25 17 12 9 7 5 4 3 6 60 45 30 20 15 10 8 6 4 3 4 72 54 36 24 18 12 9 7 5 4 2 85 64 42 28 21 15 11 8 6 4 1 92 69 46 31 23 16 12 8 7 5 0 100 75 50 34 25 17 13 9 7 5 1 81 54 36 26 18 14 10 8 6 3 93 62 42 30 21 16 11 9 6 4 100 66 45 33 23 17 12 9 7 5 71 48 35 24 18 13 10 7 7 82 55 40 28 21 15 12 9 9 93 63 46 32 24 17 13 10 10 100 68 49 34 26 19 14 10 12 77 56 39 29 21 16 12 14 88 64 45 34 24 18 14 16 100 73 51 38 27 21 15 18 83 58 43 31 24 18 20 94 66 49 35 27 20 21 100 70 52 38 29 21 23 79 59 42 32 24 25 89 67 48 37 27 27 100 75 54 41 30 28 79 57 44 32 30 89 64 49 36 32 100 72 55 40 34 80 62 45 36 90 69 51 38 100 77 56 39 81 60 41 90 66 43 100 74 45 82 47 90 49 100 NALO Document Ref MO2 850 00 January 2013 Page 27
8. an LCD display A single 9V PP3 battery will power the analyser continuously for approximately 800 hours 1 month A single recessed potentiometer permits calibration when necessary It may be used at depths of up to 600MSW 2000FSW and can also be used at surface pressures All circuit boards are specially coated to ensure protection against humidity and condensation Readings are provided in units of bar The HYP O2 Portable uses the latest electrochemical cell technology to ensure a fast response stable reading and long life up to 3 years in 20 9 oxygen at RTP All sensors are individually temperature compensated to optimise performance across the full operating temperature range The analyser may be used on its own for monitoring the local atmosphere directly or alternatively it may be used with a sampling kit available as an accessory This allows samples to be drawn from remote areas for measurement Document Ref MO2 850 00 January 2013 NA LO Page 4 HYP O2 Portable User Manual 2 Overview Display TEE On Off Switch H 2 Breather Do not block 9212 5H oxygen 7 sensor Ze Ki Calibration Pot Document Ref MO2 850 00 January 2013 NALO SS HYP O2 Portable User Manual 3 Operation 3 1 Switching on and off Simply switch the analyser on or off by switching the on off switch The oxygen measurement will appear on the LCD screen withi
9. ar analyser As with the air cal gas the pure oxygen will be dry so we don t have to worry about humidity But also even using the 99 5 pure gas we may have a 0 5 error in oxygen measurement but as we now expose the sensor to air at approximately a fifth of the calibration gas concentration the error in the air reading due to that initial 0 5 error will now be only 0 1 This is effectively negligible in virtually all applications So which is best Without a doubt calibration in pure oxygen is better as it can minimise all of the errors But as expressed above you can still obtain meaningful measurements using a fresh air calibration so long as you account for temperature and humidity Users would generally only resort to an air calibration gas in situations where it was not possible to use pure oxygen for safety reasons and because they do not need to measure such high levels of oxygen Document Ref MO2 850 00 January 2013 NALO m HYP O2 Portable User Manual 4 3 Air calibration using fresh air without temperature or humidity compensation In this section it is assumed that the fresh air in the atmosphere contains 20 9 oxygen Do not use this mode of calibration in any confined space where the level of oxygen may be slightly depleted This is the least accurate but simplest means of calibration Switch the analyser on Mil eo Subject the sensor to fresh air If the analyser was previously located at a tem
10. bar where x is the certified percentage content of oxygen in the calibration gas Use a small screwdriver to adjust the potentiometer accessible through the small hole on the front face of the analyser Clockwise rotation will increase the reading Adjust the reading to be as calculated above Figure 1 Applying Calibration Gas using constant flow regulator Docume Page 16 nt Ref MO2 850 00 January 2013 N A LO HYP O2 Portable User Manual 4 6 Calibration using pure oxygen SAFETY WARNING It is assumed that personnel using this procedure have been trained in the safe use of oxygen Do not use oxygen if you have not been suitably trained This is essentially the same as in Section 4 5 but the value x will be between 99 5 and virtually 100 depending on the grade of oxygen purchased Use exactly the same flow rate but note there is an additional test after calibration that is actually a very good indication of the health of the sensor Although this is the best method of calibration if using the entire measuring range of the analyser some users prefer not to use it because of the need to handle pure oxygen and the associated safety precautions necessary 1 Switch the analyser on If the analyser was previously located at a temperature different to the fresh air then leave the analyser for a few minutes to settle to a steady reading 2 Subject the sensor to calibrati
11. d 19 5 1 gt Replacirig battery sin en d do e cod E od e Eile 19 5 2 Replacing oxygen 20 6 Troubleshooting mtt n edid ue ma ed eel e 21 6 1 Instrument will not switch on 21 6 2 Instrument provides an oxygen reading that is believed to be incorrect 21 6 3 Instrument will not calbrate AA 21 T Safety Tute E len EE 22 8 eer lee 23 9 e EEN 24 ART ET 25 11 Declaration of 26 HYP O2 Portable User Manual Document Ref MO2 850 00 January 2013 NALO _ HYP O2 Portable User Manual 1 Introduction SAFETY WARNING Please read the information provided in Section 7 regarding the chemicals used inside the oxygen sensor Normally these are retained inside the sensor and pose no risk However if due to a fault they leak out of the sensor the analyser must then be handled with care as detailed The HYP Portable is a versatile portable analyser suitable for monitoring partial pressure oxygen in several applications including e Diving bells e Chamber atmospheres e Hyperbaric lifeboats e Submarines The compact size allows for convenient fitting within confined spaces such as diving bells and hyperbaric lifeboats or alternatively the unit can easily be hand carried It is very simple to use with just a single push button to switch power on and off and
12. e the expected ppO bar reading Expected reading Value from Table 3 x Atmospheric Pressure bar 100 or alternatively use Table 4 to lookup the in bar from the 96O and the atmospheric pressure Use a small screwdriver to adjust the potentiometer accessible through the small hole on the front face of the analyser Clockwise rotation will increase the reading Adjust the reading to be as calculated above Document Ref MO2 850 00 January 2013 NA LO Page 14 HYP O2 Portable User Manual Table 3 Humidity Compensation Chart Atmosphere oxygen percent in relation to temperature and relative humidity Temp F 32 40 50 60 70 80 90 100 110 120 Temp C 0 4 10 16 21 27 32 38 43 49 RH Atmospheric Oxygen Percent 0 20 9 20 9 20 9 20 9 20 9 20 9 20 9 20 9 20 9 20 9 10 20 9 20 9 20 9 20 9 20 8 20 8 20 8 20 8 20 7 20 7 20 20 9 20 9 20 8 20 8 20 8 20 8 20 7 20 6 20 5 20 4 30 20 9 20 8 20 8 20 8 20 7 20 7 20 6 20 5 20 4 20 2 40 20 8 20 8 20 8 20 7 20 7 20 6 20 5 20 4 20 2 19 9 50 20 8 20 8 20 8 20 7 20 6 20 5 20 4 20 2 20 0 19 7 60 20 8 20 8 20 7 20 7 20 6 20 5 20 3 20 1 19 8 19 5 70 20 8 20 8 20 7 20 6 20 5 20 4 20 2 19 9 19 6 19 2 80 20 8 20 8 20 7 20 6 20 5 20 3 20 1 19 8 19 5 19 0 90 20 8 20 7 20 7 20 6 20 4 20 3 20 0 19 7 19 3 18 7 100 20 8 20 7 20 6 20 5 20 4 20 2 19 9 19 5 19 1 18 5 H20 at 100 RH 0 6 0 8 1 2 1 8 2 5 3 4 4 7 6 5 8 6 11 5
13. easurement when working at different temperatures We can t specify this precisely but we can state the typical effect on the reading with changes in temperature see Section 8 Please note that this figure represents temperature changes which have been allowed to stabilise Performance will be slightly poorer during temperature transitions The user should note whether the analyser is subjected to temperature changes and therefore assess whether there is a need to allow a settling time before taking a reading This can be particularly important when the analyser is cold and it is taken into a warm environment to take a measurement or the reverse situation when the analyser is already warm and it is taken into a cold environment 3 9 Rapid changes of pressure The analyser will withstand a wide range of operating pressure but it must not be exposed to rapid changes of pressure It will withstand rates of change which are accepted for humans see Section 8 Do not pass the analyser through chamber medical locks in which the pressure is rapidly changed Document Ref MO2 850 00 January 2013 NA LO Page 10 HYP O2 Portable User Manual 3 10 Effect of humidity As stated earlier the analyser measures the partial pressure of oxygen The sensor will continue to operate in high levels of humidity The gas inlet to the oxygen sensor is protected by a hydrophobic membrane which prevents passage of liquid water into the sensor Care must be
14. ed perhaps as much as 0 02 to 0 04bar The reason for this is that as the sensor ages it will still measure low levels of oxygen eg air atmospheres but it will saturate and be unable to respond to high levels of oxygen eg pure Oz So what has happened is that the lower than expected reading for 100 Os has been artificially increased by use of the calibration potentiometer This then correspondingly increases the apparent oxygen content when exposed to air The fact that the sensor cannot respond to higher levels of oxygen means the sensor is beyond the end of its useful life Replace it at the earliest opportunity Document Ref MO2 850 00 January 2013 NALO Gg HYP O2 Portable User Manual 4 7 Calibration against a reference analyser In some circumstances it is not possible to use fresh air or calibration gas and yet there is still a need to check or calibrate the instrument This can only be done if there is a reference available in which there is a suitably low uncertainty such that it is deemed possible to calibrate the analyser against the reference It must be ensured that both the HYP O2 Portable and the reference are both measuring the same gas Do not assume that simply because both analysers are in the same room that they ought to measure the same Locate both analysers together or subject them to the same sample gas If the reference is a partial pressure analyser itself then simply adjust the HYP O2 P
15. gas if you have not been suitably trained To subject the analyser to a known concentration of calibration gas use an Analox flow adaptor pushed into the sensor s gas inlet Connect the flow adaptor either to a constant flow regulator as shown in Figure 1 or to a flow meter in turn connected to a pressure regulator In either case the aim is to achieve a flow of between 0 2 and 1 0 litres per minute of calibration gas through the flow adaptor The calibration gas will be certified as containing x oxygen to an accuracy of y The accuracy y is not required in the calibration but it is important to recognise that this leads to an uncertainty in the resulting analyser reading Typically y will be either 1 2 or 5 depending on the grade of gas purchased The procedure could apply for all values of x in the range 1 to 100 but it would be very unusual to calibrate with anything less than 20 oxygen The larger the number the greater the accuracy of the analyser over its entire measuring range Switch the analyser on If the analyser was previously located at a temperature different to the fresh air then leave the analyser for a few minutes to settle to a steady reading Subject the sensor to calibration gas at a flow rate of between 0 2 and 1 0 litres per minute Allow the reading to settle which will take approximately one minute Calculate the expected reading Expected reading x 100 x Atmospheric Pressure
16. ion 4 5 Instrument will not calibrate If during calibration the calibration potentiometer does not provide sufficient adjustment of the readout check first that the calibration conditions are correct Are you trying to adjust to the correct figure for the gas to which the sensor is exposed Ultimately if the sensor is not replaced at the correct service intervals an expired sensor will give too low a reading and it will become impossible to adjust the reading to the desired value Correct maintenance ought to ensure that this condition is never encountered because if the analyser is required for immediate use it will be necessary to fit a new sensor first Document Ref MO2 850 00 January 2013 NALO HYP O2 Portable User Manual 7 Safety information The oxygen sensor is an electrochemical device and contains a caustic electrolyte Always check to make sure that it is not leaking and do not allow it onto any part of your body or clothing When the life of the sensor has expired or it is leaking or otherwise damaged it must be disposed of safely in accordance with local regulations The electrolyte is potassium hydroxide solution KOH which is hazardous In the event of an accident use the following first aid procedures Body Part Effect First Aid Procedures Skin Contact could result in a chemical Immediately flush the skin thoroughly with burn water for at least 15 minutes Remove Persons with
17. jo in gt Io IN mole o gt o w a to nje jejeje jo s IS 5 fo e i io o E io hs S N LL o Ajo o ie la le lo lo Ie e Git 3121512513 o o 2 o o w w w gt gt gt ojs x w w ico ica eo gt 9 2 S S 5 t amp La Lo m m o o o c t Jin o 2 o o wlolalalala 5 io PS ESSE alee ety elei Eeer Example When measuring 0 30 bar ppO at a pressure of 1 40 bara the oxygen comprises 21 4 of the atmosphere being measured NALO Document Ref MO2 850 00 January 2013 Page 9 HYP O2 Portable User Manual 3 7 Concerned whether reading is accurate If you are in any doubt as to the accuracy of the analyser reading refer to Section 6 2 for guidance on how to check the credibility of the reading If the reading is believed to be incorrect then the analyser should be recalibrated as detailed in Section 4 3 8 Effect of temperature changes The oxygen sensor within the analyser is fitted with temperature compensation components which automatically adjust the output of the sensor at different temperatures The user therefore ought not to be concerned as long as the temperature is within the normal operating temperature range However the compensation is not perfect and thus it is necessary to allow for an error in m
18. n one or two seconds The oxygen reading will be in the units specific to the analyser This manual assumes that bar are the units of display 3 2 Ambient Local atmosphere monitoring When monitoring the local atmosphere around the analyser gas will diffuse into the oxygen sensor from the atmosphere and the display will indicate the partial pressure of oxygen to which it has been exposed Avoid breathing out over the sensor since exhaled breath contains a significant proportion of carbon dioxide and a corresponding deficiency of oxygen which will affect the accuracy of the reading Conversely some customers use the effect of breathing on the sensor as a confidence check prior to taking a reading just to make sure that the analyser is functioning However they must then wait usually say around 30 seconds until normal mixing of the atmosphere allows the reading to settle back to a true reading 3 3 Remote monitoring To monitor a remote atmosphere the analyser may be used in conjunction with the remote sampling kit Note it is assumed that the remote area is at the same pressure as the location in which the analyser is being used The sampling kit consists of an aspirator bulb which allows the user to hand pump a sample of gas from the remote area through a sample line and a flow adaptor which is pushed into the oxygen sensor inlet port The aspirator must be pumped enough times to flush the sample through the sample line As supplied the
19. nsor to the front face of the enclosure by pushing it through the larger hole from the underside 7 Connect the sensor wiring lead to the two pin connector 8 Ensure that the wiring is neat and tidy and will not become trapped when re assembling the enclosure 9 Refasten the enclosure using the 4 screws Document Ref MO2 850 00 January 2013 NA LO Page 20 6 6 1 6 2 6 3 HYP O2 Portable User Manual Troubleshooting Instrument will not switch on Check that the battery is correctly inserted and that the battery is not exhausted Check that the battery wiring has not become damaged due to being trapped in the case Refer to the instructions in Section 5 1 about changing the battery and ensuring the wiring is not trapped Instrument provides an oxygen reading that is believed to be incorrect If in doubt about the oxygen measurement it is best if possible to expose the analyser to a Known oxygen concentration which will give a good indication whether the instrument is working correctly or not In many cases a normal fresh air atmosphere is a readily available reference although it is still necessary to know the atmospheric pressure to work out the actual partial pressure of oxygen If fresh air is not available for example in a submarine then the analyser reading should be compared with that from another measuring device refer Section 4 7 or checked against a bottle of calibration gas refer Sect
20. oduct can not be placed in household waste bins Please check local regulations for information on the disposal of electronic products in your area Document Ref MO2 850 00 January 2013 NA LO 5 HYP O2 Portable User Manual 11 Declaration of conformity DECLARATION OF CONFORMITY Number Manufacturers name Manufacturers address It is declared that the following product Product name Conforms to all applicable requirements of MO2 913 00 Analox Sensor Technology Ltd 15 Ellerbeck Court Stokesley Business Park North Yorkshire UK TS9 5PT Analox Mini O2 HYP BS EN 50270 1999 BS EN 61000 6 3 2001 The above product complies with the requirements of the EMC Directive 89 336 EEC as amended Signed on behalf of Date Signed Name Position Analox Sensor Technology Ltd 20 Dec 2012 N TERN A Mark Lewis Managing Director SA127 Issue 2 September 2006 Document Ref MO2 850 00 January 2013 Page 26 NALO Appendix A Conversion Tables HYP O2 Portable User Manual Table 5 Convert Dew point in C to Relative humid ity in Ambient Temperature C 0 4 10 16 21 27 32 38 43 49 Dew Point C 50 1 0 0 0 0 0 0 0 0 0 25 10 8 5 3 3 2 1 1 1 1 22 14 10 7 5 3 2 2 1 1 1 18 20 15 10 7 5 4 3 2 1 1 14 30 22 15 10 7 5 4 3 2 2
21. of 0 21bar Using the formula Oxygen ppO bar Oxygen Percentage Absolute Pressure bar 100 allows a table of ppO values at various pressures to be created assuming that the atmosphere is maintained at 20 9 Table 1 can be used when you know the atmospheric pressure in bar Document Ref MO2 850 00 January 2013 NALO HYP O2 Portable User Manual Table 1 ppO bar of 20 9 O at x bar Atmospheric Pressure Example at a pressure of 1 05 Bar 20 996 oxygen content gives a partial pressure of 0 22 bar ppOe 0 0 LA LA o iS I ae AE ie 067 068 aa 069 el 071 072 072 09 095 095 a 4 A 096 0 097 0 7 f k 3 1 115 115 1 16 146 1 16 Le OI OI al _ 11 118 1 18 5 1 19 119 120 120 120 120 ses 121 121 122 122 122 122 E Gill 127 _ 1 1 18 18 1 20 1 130 1300 130 a esj 132 1 132 1291 133 1 38 60 134 13 134 134 135 135 65 15 1 1 1 1 137 M eej 138 138 138 139 139 139 140 140 Su aja aje SIR 8 Document Ref MO2 850 00 January 2013 N A LO Page 8 3 6 HYP O2 Portable User Manual Conversion of partial pressure measurement to a percentage measurement To calculate the percentage concentration of oxygen
22. on gas pure oxygen at a flow rate of between 0 2 and 1 0 litres per minute Allow the reading to settle which will take approximately one minute 3 Calculate the expected reading Expected reading x 100 x Atmospheric Pressure bar where x is the certified percentage content of oxygen in the calibration gas typically 99 5 or 99 9 4 Use a small screwdriver to adjust the potentiometer accessible through the small hole on the front face of the analyser Clockwise rotation will increase the reading Adjust the reading to be as calculated above 5 Remove the flow adaptor from the sensor and allow the sensor to settle to the ambient air conditions 6 Calculate the expected partial pressure reading for the ambient conditions If this is fresh air at low levels of humidity then this will be 20 9 oxygen The expected reading will be Expected reading 20 9 x Atmospheric Pressure bar 100 For higher levels of humidity obtain the expected percentage of oxygen by reference to Table 3 and substitute this for the 20 9 figure in the equation above 7 Compare the analyser reading with the expected reading It would be expected for the reading to be within 0 01bar of the expected reading provided that the expected reading is not in error due to humidity effects or mis calculation with the assumed atmospheric pressure At the end of the sensor s life it will be found that this reading will be much higher than expect
23. ortable analyser to give the same reading it may be necessary to convert from one set of units to another unless both analysers are reading in Torr If the reference analyser measures percentage of oxygen convert this to a partial pressure by obtaining the local ambient pressure preferably in bar Then adjust the HYP Portable analyser to give a reading equal to 0 100 x Ambient Pressure Bar Document Ref MO2 850 00 January 2013 NA LO Page 18 HYP O2 Portable User Manual 5 Maintenance 5 1 Replacing battery The analyser uses a single 9V PP3 type battery If using the analyser at high pressure gt 1 5 bar absolute you may consider using a battery that has been tested to operate under hyperbaric conditions These are available from Analox refer Section 9 In truth very few PPS3 batteries are known to have failed under pressure but in critical applications this attention to detail can minimise the risk of failure Simply unscrew the four screws securing the lid then slide the battery from under its retaining clip which is mounted to the enclosure base Unclip it from the battery connector Fit the new replacement battery to the battery connector and locate the battery under its retaining clip before refitting the enclosure lid back into place Ensure that the battery wiring does not become trapped in the process Secure in place with the previously removed screws Discard the old battery in line with your own batte
24. perature different to the fresh air then leave the analyser for a few minutes to settle to a steady reading Calculate the expected reading Expected reading 0 209 x Atmospheric Pressure bar Use a small screwdriver to adjust the potentiometer accessible through the small hole on the front face of the analyser Clockwise rotation will increase the reading Adjust the reading to be as calculated above 4 4 Air calibration using fresh air with temperature and humidity compensation In this section it is assumed that the fresh air in the atmosphere contains slightly less than 20 9 oxygen due to dilution with water vapour Do not use this mode of calibration in any confined space where the level of oxygen may be slightly depleted Switch the analyser on D Subject the sensor to fresh air If the analyser was previously located at a temperature different to the fresh air then leave the analyser for a few minutes to settle to a steady reading Obtain the temperature of the environment in either Fahrenheit or Centigrade to the nearest 5C or 10F Refer to Table 3 and select the column in the table corresponding to the temperature Obtain the relative humidity of the environment in RH and select the row in Table 3 corresponding to this humidity Locate the cell in Table 3 where the selected row and column intersect This will tell you the expected percentage of oxygen in the atmosphere Calculat
25. pre existing skin contaminated clothing and wash before re disorders may be more use Obtain medical advice if continued susceptible to the effects of the irritation substance Ingestion Corrosive May cause sore throat If swallowed DO NOT INDUCE abdominal pain nausea and VOMITING Wash out mouth thoroughly severe burns of the mouth throat with water and give and stomach and may be fatal plenty of water to drink Obtain medical advice immediately Eye Persons with pre existing eye Irrigate thoroughly with water for at least problems may be more 15 minutes Obtain medical advice susceptible to the effects of the immediately substance Corrosive May cause redness pain blurred vision and eye burns Contact can result in the permanent loss of sight Inhalation Persons with pre existing Remove to fresh air Rest and keep warm impaired respiratory function may be more susceptible to the effects of the substance Inhalation is not an expected hazard unless heated to high temperatures Mist or vapour inhalation can cause irritation to the nose throat and upper respiratory tract Obtain medical advice if applicable Document Ref MO2 850 00 January 2013 Page 22 NALO 8 Specifications HYP O2 Portable User Manual Sensor type Analox 9100 9212 5H Sensor life Up to 3 years in air at standard atmospheric pressure Recommend replacement at 12 18 or 24 months dependan
26. rror above from 0 01bar down to 0 005bar which for most users is expected to be good enough In some critical applications some users insist that the analyser is calibrated every day In this instance the daily calibration is essentially little more than a check that the instrument is still working normally Document Ref MO2 850 00 January 2013 NA LO Page 12 HYP O2 Portable User Manual 4 2 of calibration The instrument will most likely be calibrated in one of two ways depending on which best suits the intended use For users who need to make oxygen measurements over the entire range of the sensor it is best to calibrate using pure oxygen For users who only expect to use the lower parts of the range for instance in a submarine kept essentially near to normal atmospheric pressure and in air equivalent atmospheres it may be preferable for simplicity rather than accuracy to simply perform an air calibration In its simplest form this requires no specialist calibration gas and is hence favoured by some users However it is strictly not advisable if the analyser is then expected to make accurate measurements at significantly higher concentrations of oxygen It also introduces further uncertainty into the calibration particularly at higher temperature humidity Whilst everyone expects that fresh air contains 20 9 oxygen as relative humidity levels increase and particularly as the temperature also increases allowing
27. ry disposal procedures Document Ref MO2 850 00 January 2013 NALO SS HYP O2 Portable User Manual 5 2 Replacing oxygen sensor Please read the safety information in Section 7 before handling oxygen sensors The analyser uses an Analox supplied oxygen sensor The sensor will typically last for 3 years when exposed to normal air at normal atmospheric pressure Regular use in either high temperature environments or in situations using partial pressures of oxygen greater than 209 mbar ppO 0 21bar ppO will cause the sensor to deteriorate more rapidly and hence shorten its life For instance exposure to pure oxygen at standard atmospheric pressure would effectively consume the oxygen sensor approximately five times faster than normal If maintained in this atmosphere continuously the sensor would need replacing typically every 6 months However such exposure would represent fairly severe circumstances and is not considered likely Most commercial diving and military customers tend to replace the sensor at 12 18 or 24 months depending on their mode of usage To replace the sensor Switch the analyser off Remove the four cross head screws from the enclosure lid Separate the two halves of the enclosure Remove the sensor from the enclosure lid this should just pull out Disconnect the Molex two pin connector that connects the oxygen sensor to the printed circuit board o Fit the new oxygen se
28. sample line is 2m long but this can be extended 3 4 Low battery warning When the analyser is in use and the battery is almost exhausted terminal voltage less than approximately 5 5V a battery symbol will appear in the top left corner of the display In this condition the analyser will continue to measure oxygen for a few hours but it is advisable to replace the battery as soon as possible As the battery depletes further the oxygen reading will ultimately be affected Replace the battery as detailed in Section 5 1 Document Ref MO2 850 00 January 2013 NA LO Page 6 HYP O2 Portable User Manual 3 5 Note on partial pressure measurements The analyser measures the partial pressure of oxygen This is not to be confused with the percentage of oxygen in the atmosphere In an environment where it is the partial pressure of oxygen that is physically being maintained for example a diving bell then the readout from the analyser is simple to understand So for example in a diving bell being maintained at 400mbar ppO the analyser will simply read 0 4bar This will be the same whatever the depth of the diving bell provided that the ppO is maintained correctly In a submarine being maintained at a nominal air concentration of 20 9 the reading on the analyser will vary according to the actual pressure inside the submarine At 1bar absolute pressure 20 996 oxygen will equate to a partial pressure of oxygen
29. t upon type of use Range 0 to 2bar ppO Accuracy 1 of reading plus 1LSD Temperature effect 0 2 of reading per Long term drift typically 5 of reading per year Battery type 9V PP3 Battery life 1 month 800 hours continuous operation 3 months operation for 8 hours per day Operating temperature range 0to 40 C Operating pressure range 0 8 to 60bar absolute approx 600 MSW 2000FSW Rate of compression decompression 2 bar minute Dimensions 64mm width x 98mm height x 36mm depth Weight 0 200kg Warranty Electronics 1 year Sensor 3 months NALO Document Ref MO2 850 00 January 2013 Page 23 HYP O2 Portable User Manual 9 Spares 9100 9212 5H Replacement oxygen sensor 2557 1855 Hyperbarically tested PP3 battery GENPISDK Sample Draw Kit consisting of push in flow adaptor aspirator bulb 2m of neoprene tubing and a stainless steel probe SA7 100HYP CALKIT Calibration kit comprising 110 litre 21 oxygen balance nitrogen 0 5 litre minute flow regulator to fit 110 litre bottle push in flow adaptor 1 metre of tubing trimming tool 8000 0011GA Flow adaptor note not required if you already have either of the above kits Document Ref MO2 850 00 January 2013 Page 24 NALO HYP O2 Portable User Manual 10 Disposal According to WEEE regulation this electronic pr
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