User Manual
Contents
1. EIl CO User Manual Analox Ltd Analox 15 Elleroeck Court Stokesley Business Park Tech Support North Yorkshire TS9 5PT UK sap 44 791 7 T 44 0 1642 711400 F 44 0 1642 713900 W www analox net E info analox net 764348 This support line is closed on UK public holidays Ell CO User Manual List of Contents 1 MOGUC OUT cers oe area ac giva nacacqunceacatunteiniapeauceas remind E E muecinddospanssceeaeeaccuttd 6 Tel ACK ACS OM ON a stesr eat case we a date matin aaa cecst edu duatn ada suninata item miedanhtdatauindiens 6 Ba APUNE tee i eene ene E et aera eS cee eens nee ee ae eee eee eee eee eee 6 2 Se A o r cence enncte E gta caterer E ESE sian sa EEE EEE E EE EE 7 Zl SONI O Fl e TE E 7 22 Freezing INe DISpiay sissien nean E a EA ERA E R 7 A WCA O eee A E 7 24 Low Battery Ndie alo cesarean orne cides meine rE RRR rE REE RRt 7 29 MIE CII your Tank sssr E 8 2 6 Maximum allowable CO exposure levels cccccecceceeeeceeeeceeeeeeeeeeeeeeeeeeeaeeeeaeaeeaees 9 3 PIC US O CNECK Sincaczannexstuardedaneernedate sounds EONA saeredeneanecatieansnaestunseastsaedelaceansacatesnandesieds 10 al ZOSO eam mE eye Na eer eee eee er tee eee ee 10 See UMN FOG HINO e cent aiiads cee anes E A 11 4 Helium Sensitivity CffCt ccc cecec ec ee eee eeeeeee cesses eens eseeeeeeeeseeeeeeeeeeneeaeeeseeneaneeseeaes 13 5 IPOUIDICS OO MING caccsnettcrtsaPenesienracantanehduntiaun T E a E T E 15 6 MANCANO G eere parE A E E E2. molecules The result of this process is that as the concentration of helium increases a greater number of carbon monoxide molecules enter the sensor which results in artificially high readings For this reason a helium compensation factor should be applied to the measured value of carbon monoxide when measuring heliox or trimix gas The effect of the presence of helium in the sample gas is to increase the carbon monoxide cell sensitivity This means that as the amount of helium increases to its typical maximum level typically 99 He in a saturation diving application the sensitivity of the CO cell increases by a factor of approximately 2 31 typical So if 69pm carbon monoxide was measured in a tank containing 99 He the actual content would be 3ppm 6 2 31 2 60ppm The chart below Figure 1 shows the typical helium sensitivity effect across a helium content range of 1 to 99 which is the typical range of Helium content used in diving applications Helium sensitivity effect Heliox and Trimix gas testing W hen testing heliox and trimix gas mixtures the helium content will vary according to the particular mix that is required Therefore the helium compensation factor applied to the measured carbon monoxide content will vary accordingly For example a gas mix with 99 helium content has a helium compensation factor of 2 31 This means that the content of carbon monoxide measured will be larger that the actual carbon monoxide content
3. 1 Package Content On opening your Analox Ell CO please check you have the following items a Ell CO b Sampling dome c User manual d Any accessories ordered for your Ell CO from e Storage Case e Bump Testing Gas Kit 10 pom CO Aerosol 1 2 About the Ell CO The Ell CO carbon monoxide CO analyser is designed to measure CO levels in the range 0 to 50ppm for tank CO level checking The Ell CO is ergonomically designed and equipped with several features to ensure ease of use and reliability The instrument has been designed to be held in the left hand to facilitate checking your tank It is fitted with a large digital display and incorporates an internal electrochemical carbon monoxide sensor Power is provided by a 9V battery which will last for approximately 1 year before replacement is necessary The Ell CO will automatically switch off after 10 minutes to ensure battery life is not compromised if the instrument is accidentally turned on The Ell CO is water and drop resistant Designed specifically for the diving industry whether you may be a Sport Commercial or Military diver where hostile environmental conditions are the norm not the exception Your Ell CO is supplied ready to use all you need to do is push in the sampling dome NALO Document Ref P0107 800 06 September 2013 Page 6 Ell CO User Manual 2 Operation 2 1 Switching On The analyser is fitted with an ON button located on the sid
4. bump tests Not enough Ambient is Perform the zero set procedure section 3 1 adjustment on contaminated again in clean air or calibrate using the Zero calibration knob to Calibration Kit Section 7 2 zero display 5 Troubleshooting Reading held Press ON button to unfreeze Sensor failure Change sensor Faulty connections Return to supplier Tank gas Ell CO calibrated using Perform the zero set procedure section 3 1 measurement taken is Contaminated air again in clean air or calibrate using the zero reading negative calibration kit Section 7 2 Reading erratic Pressure on sensor Reduce gas flow rate Radio interference Move unit away from any radio equipment Sensor old or faulty Change sensor Condensation on sensor Shake water off sensor face Reading does not Reading held Press ON button to unfreeze change when Sensor failure Change sensor calibration knob is Faulty connections Return to supplier turned missing fe Sensor faulty Change sensor Sensor not in air Check sample dome is not fitted another immediately before use N A LO Document Ref P0107 800 06 September 2013 Page 15 Ell CO User Manual 6 Maintenance 6 1 Battery replacement 1 Loosen the 4 screws located on the front cover The gasket seal is designed to prevent water leaking into the Ell CO so the seal may be tight Loosen the seal by moving the lid from side to side and then carefully lift the cover 2 Slide the batt
5. by a factor of 2 31 So if 699m carbon monoxide was measured in this tank the actual content would be 3ppm 6 2 31 2 60ppm He compensation factor Nitrox gas testing W hen testing nitriox gas mixtures the helium compensation factor is 1 00 as no helium is present in the gas mix 10 20 30 40 i 50 60 70 80 90 100 Helium content Figure 1 The chart shows that as the of He increases it has the effect that the displayed measured value will be greater than the actual carbon monoxide content in the mix This ensures that any inaccuracies are fail safe N A LO Document Ref P0107 800 06 September 2013 Page 13 Ell CO User Manual The look up table below Figure 2 shows a simplified representation of this data to quickly identify the compensation factor to be applied to you tank gas measurement in mix factor Figure 2 Document Ref P0107 800 06 September 2013 Page 14 NALO Ell CO User Manual SYMPTOM CONDITION ACTION L symbol Low battery Change battery No display Switched off Switch on Poor battery connection Check battery connection Return to supplier Bump test fail Sensor expired Please refer to website Incorrect bump gas Ensure bump gas is 10ppm CO as supplied by Analox Calibration expired Contact an Analox approved service centre or purchase a calibration kit Bump test gas exhausted Contact Analox to purchase a new bump test kit A bump test kit should supply around 20
6. is alongside and even if you are moored near another vessel To ensure the accuracy of the zero calibration the following should be considered 1 Check the contents of your gas cylinders before boarding the boat 2 Use a known clean source of air to pass a flow directly over the sensor using the push in calibration adaptor 3 Calibrate the Ell CO using the zero calibration kit see section 7 2 3 2 Bump testing A bump test is a means of verifying that the instrument is working within acceptable limits by briefly exposing to a Known gas mixture formulated to change the output of the sensor This is different from a calibration where the instrument is also exposed to a known gas mixture but is allowed to settle to a steady figure and the reading adjusted to the stated gas concentration of the test mixture You can bump test your Ell CO utilizing one of the follow methods The first of which and preferred method utilizes a 10 ppm bump gas The second method permits the use of your breath when traditional bump gas is not available Bump testing of the device is necessary to ensure correct response to carbon monoxide gas 3 2 1 Traditional bump test 1 Power the Ell CO up and set the display to zero 2 Directing the nozzle tube of the bump test gas aerosol into dome aperture spray the bump test gas for 5 seconds N A LO Document Ref P0107 800 06 September 2013 Page 11 3 4 3 2 2 Document Ref P0107 800 06 Se
7. materials The warranty does not extend to and we will not be liable for defects caused by the effects of normal wear and tear erosion corrosion fire explosion misuse use in any context or application for which the equipment is not designed or recommended or unauthorised modification Following a valid warranty claim in accordance with the above the equipment upon return to us would be repaired or replaced without cost or charge but in our discretion we may elect instead to provide to you which ever is the lesser of the cost of replacement or a refund of net purchase price paid as per our Invoice on initial purchase from us We shall have no liability for losses damages costs or delays whatsoever We shall have no liability for any incidental or consequential losses or damages All express or implied warranties as to satisfactory or merchantable quality fitness for a particular or general purpose or otherwise are excluded and no such Warranties are made or provided save as Set out in this Clause 7 In order to effectively notify a Warranty claim the claim with all relevant information and documentation should be sent in writing to Analox Ltd 15 Ellerbeck Court Or by e mail to info analox net Stokesley Business Park Or by Fax to 44 1642 713900 Stokesley North Yorkshire TS9 SPT We reserve the right to require from you proof of dispatch to us of the notification of warranty claim by any of the above alternative means T
8. EIICOZCALKIT Synthetic air 21 oxygen balance nitrogen Calibration tool kit SA7EIICOTOOLKIT Comprising Trimming tool T10 torx driver Flow indicator for gas bottles Ell CO push in cal adaptor Ell CO calibration DVD Analox 500Mb USB stick NALO Ell CO User Manual 12 Disposal a According to WEEE regulation this electronic product can not be placed in household waste bins Please check local regulations for information on the disposal of electronic products in your area N A LO Document Ref P0107 800 06 September 2013 Page 25 Ell CO User Manual 13 Declaration of Conformity DECLARATION OF CONFORMITY Number P0107 903 00 Manufacturers name Analox Sensor Technology Ltd Manufacturers address 15 Ellerbeck Court Stokesley Business Park Stokesley England TS9 SPT It is declared that the following product Product name Analox Ell CO Product code Ell CO Conforms to all applicable requirements of BS EN 61000 6 1 BS EN 61000 6 3 IEC EN 61010 1 2001 2nd ed BS EN 60529 IP6X The above product complies with the requirements of the EMC Directive 89 336 EEC as amended The above product complies with the requirements of the Low Voltage Directive 73 23 EEC as amended Signed on behalf of Analox Sensor Technology Ltd Date 01S December 2010 Name Mark Lewis Position Managing Director SA127 Issue 2 September 2006 NALO Document Ref P0107 800 06 September 2013 Pag
9. R E venetian 16 Ol Battery replacement scires knina a EEEE E A a ERE AR 16 G2 SENSOF FEDIACCHISI sisrencuncartcomsavanoamnerancausieemtensmperancsatebannrarastansadenaaumavanansnasaeennan 16 DS 0 1 2 Rots a ee eee eee eee nee Nee ee ee eee ee eee eee 18 6 4 Sensor handling information ccccceececsececeececeececeeeeceeeesecseaeseeaeeeeseseseeseseesesass 18 7 CANO PATON EN E E EA E A A E A E 19 7 1 Span eer 18 6 11 0 ee 19 7 2 Calibration using the zero Calibration Kit cccccececseceeeeceeeeeeeeeeeeeeneeeeeeeeeaeeeeaeees 19 8 ICE IMION Mell ONY asear E ERSE a EEEE 21 9 Warranty InfOrmMatiOn ccccccccececeeeeeecee eee ee sees ee eeeeeeeeeeeeeeeseseeaeeeeeseeeeeeeseenegeaegeeeeaes 22 10 Specifications after factory calibration cccccceccec eee eceeeeceee esses eeeeeeeeeeaeeeeaeeeeaeaeegees 23 10 1 Specifications using bump test and Zero Set only c cee eeeececeeeeeeeeeeeeeeeeeeeees 23 WU AN OS aie eaters ya E cane EE T es cee x dase non uh ean oral ante llores EE na E AE TT 24 WZ WIIG DOS Ie a cacunsaute centarmansayeueenserescencaniecuncusanacnsa tenn a 25 13 Declaration of Conformity ccccceccceec eee eceee ec eeeeeeeeeeeeeeeeeeeeseeseeeeeeeeeeeaeseeaeeeeaeaeegees 26 Document Ref P0107 800 06 September 2013 Page 4 NALO Ell CO User Manual N A LO Document Ref P0107 800 06 September 2013 Page 5 Ell CO User Manual 1 Introduction 1
10. ctrolyte has occurred use rubber gloves and wear chemical splash goggles to handle and clean up Rinse contaminated surfaces with water If anybody comes into contact with the electrolyte please refer to Section 8 Document Ref P0107 800 06 September 2013 NALO Page 18 Ell CO User Manual 7 Calibration 7 1 Span calibration To meet the factory calibration specifications given in section 10 span calibration is required every six months See section 11 for details of calibration kits available For reduced accuracy operation the Ell CO can be used as a Go No Go tester provided that the unit passes a zero set and bump test as specified in section 3 Alternatively contact an Analox approved service centre for span calibration A full list of service centres can be found on the Analox website www analox net 7 2 Calibration using the zero calibration kit lf in doubt that the ambient air where the Ell CO is in use is clean i e free of carbon monoxide then the zero calibration gas kit together with the calibration tool kit See section 11 should be used to ensure an accurate calibration and maintain safe diving 1 Screw the flow indicator on to the zero calibration cylinder synthetic air and fit the flow adaptor to the tubing 2 Remove the sample dome from the Ell CO and push the push in calibration adaptor in to the sample dome aperture Press the ON button to switch the Ell CO on Ensure the Ell CO display hold f
11. e 26
12. e calibration knob until the display reads Oppm If this is not possible refer to Section 5 Calibration in clean air The analyser is now ready for bump testing SAFETY WARNING It is of vital importance that the zero calibration is performed with a source of clean air Just because a Calibration is performed in the open air on board a boat it should not be assumed that the air is clean Due to backdrafting or the Station Wagon effect accumulation of carbon monoxide can occur in the cabin or aft deck even in an open area Air flow Low pressure area created at rear of boat pulling exhaust fumes back in to the boat Document Ref P0107 800 06 September 2013 Page 10 NALO Ell CO User Manual This effect occurs as air moves around a boat and forms a low pressure area behind it that tends to pull exhaust fumes back into the boat If the Ell CO is calibrated using this already contaminated air it will result in false tank gas measurements Users should be aware of this and should take appropriate measures to ensure a clean air source is used when performing a zero calibration as the accuracy of the measurement of the breathing air tank is only as accurate as the initial calibration The risk of air contamination does not only exist when the boat is moving at speed it can also be encountered with the boat moving at slow speed or idling The air in your boat can also be contaminated by another vessel s exhaust that
13. e of the unit when held in your left hand the button should sit comfortably under your thumb To turn the unit on press the button once the analysers display will now show a carbon monoxide reading in parts per million ppm Do not use the Ell CO before calibration see Section 3 Switch On 2 2 Freezing the Display In use the ON button also acts as a HOLD button to allow the instrument to be removed from the tank for easier reading without losing the measured gas concentration Press once to freeze the current reading on the display a frozen reading is indicated by a symbol being shown m Reading held Reading released monitoring ambient CO 2 3 Switching off The Ell CO will automatically switch off after 10 minutes to prevent the battery from being drained if the unit is accidentally switched on 2 4 Low battery indication The low battery warning is shown by an L on the display indicating that the battery must be changed before using the instrument See Section 6 1 m L Low battery symbol WARNING Do NOT use when the LOW BATTERY symbol is displayed N A LO Document Ref P0107 800 06 September 2013 Page 7 Ell CO User Manual 2 5 Checking your Tank The Ell CO comes complete with a unique sampling dome which allows you to directly apply the analyser to the outlet on your tank 1 Ensure that the span calibration of the device is within date wit
14. ery out of its holder and disconnect the lead 3 Connect the lead to the new battery and slide the battery into its holder under the battery clip 4 Replace the cover carefully taking care that the sensor locates properly and that no wires are trapped Screw down until you feel the gasket compress do not over tighten the screws 6 2 Sensor replacement 1 Replacement part number for your sensor is 9100 1700A 2 Remove the sampling dome and loosen the 4 screws located on the front cover The gasket seal is designed to prevent water leaking into the Ell CO so the seal may be tight Loosen the seal by moving the lid from side to side and then and carefully lift the cover Document Ref P0107 800 06 September 2013 Page 16 Ell CO User Manual 3 Unplug the connector from the back of the sensor 4 Unscrew the sensor from the front cover 5 Dispose of the old sensor according to local regulations for acidic compounds 6 Remove the new sensor from its pack and check it for leaks See section 7 for safety information check the sensor has a rubber o ring fitted at the base of the thread on the front of the sensor Screw the sensor into the front cover tightly and connect to the Ell connector Align the metal sockets on the connector with the pins of the sensor and push on firmly O ring 7 Replace the cover carefully ensuring that the sensor locates properly and that no wires are trapped Screw down until
15. he equipment should not be sent to us without our prior written authority All shipping and Insurance costs of returned equipment are to be born by you and at your risk All returned items must be properly and sufficiently packed NALO Ell CO User Manual 10 Specifications after factory calibration 20 to 50 4 to 122 Temperature effect lt 2 pom CO C lt 1 1 pom CO F Calibration gas flow rate 0 5 to 1 0 litres minute Wegt Hez neo oo Weight 225g 80Z Dimensions 130 I x 70 w x 55 d mm 5 1 4 I x 2 3 4 w x 2 1 4 d inches Ingress protection BSS NEMA 4 If you have any comments or queries about the Ell CO please contact us Tel 44 1642 711400 Fax 44 1642 713900 Email info analox net Website www analox net 10 1 Specifications using bump test and zero set only 1 digit up to 10ppm CO N A LO Document Ref P0107 800 06 September 2013 Page 23 11 Spares Ell CO User Manual The Ell CO can be supplied with any of the following accessories Part Number nae Storage case compact SA2ZEIIMINICASE Document Ref P0107 800 06 September 2013 Page 24 water proof case ideal for protecting your Ell CO SA7CAN510 Bump test gas kit 10ppm CO in balance air Providing around 20 bump tests from a standard bump test kit Span calibration gas cylinder SA7E COCALKIT 10ppm Carbon monoxide in balance air Zero calibration gas cylinder SA7
16. hin 6 months 2 Ensure that the instrument has been zero calibrated See section 3 1 and bump tested see section 3 2 before checking your tank 3 Push the sampling dome into the sensor aperture 4 Very slowly open the pillar valve with your right hand until the hiss of gas escaping can just be heard WARNING Open tank valve EXTREMELY CAREFULLY before applying the Ell CO Eye protection should be worn during this procedure 5 Hold the Ell CO in your left hand and press the sampling dome firmly against the tank outlet Take a direct reading from your tank 6 Close the pillar valve after thirty seconds when a stable reading is observed on the Ell CO 7 lf in doubt repeat the procedure taking care to ensure a very low gas flow 8 For ease of use the Ell CO is fitted with a hold feature Once a stable reading has been observed press the ON button to hold this reading The Ell CO can then be moved away from the tank to enable you to record the CO reading To cancel the reading press the ON button again Document Ref P0107 800 06 September 2013 Page 8 NALO Ell CO User Manual Reading held 9 It is important to note that after a few seconds of the gas flow being stopped the reading will begin to change towards the level in the surrounding air Oppm CO you should therefore take the reading or press the hold button while flow is ON NOTE When the Ell CO is used to measure the carbon mono
17. ptember 2013 Page 12 Ell CO User Manual Ensure that the displayed reading rises above 7ppm but below 13ppm CO If bump testing fails to raise the display reading sufficiently ensure that sufficient gas remains in the bump test kit Please see Section 5 for further troubleshooting information Bump test your Ell CO with your breath Power the Ell CO up and set the display to zero Take a deep breath and hold it for 5 to 10 seconds With the dome adaptor removed exhale a slow and even breath into the dome aperture Ensure that the displayed reading rises to 1 to 2ppm Smokers may see a higher sensor response lf breath testing fails to raise the display reading sufficiently then a traditional bump test should be performed as per section 3 2 1 Please see Section 5 for further troubleshooting information NALO 2 00 2 00 00 Helium compensation factor D O 0 50 0 00 Ell CO User Manual 4 Helium sensitivity effect The carbon monoxide sensor used in the Ell CO is a capilliary type sensor These types of sensors are affected by the presence of helium He and in such cases give higher than anticipated outputs The reason for this phenomenon is due to the small size of the helium molecule When present in high concentration the helium molecules diffuse rapidly through the capillary into the carbon monoxide sensor and at the same time allowing more rapid diffusion of the much larger carbon monoxide CO
18. re use Obtain medical advice if continued irritation Ingestion Corrosive May cause sore throat If swallowed DO NOT INDUCE VOMITING abdominal pain nausea and severe burns of the mouth throat and Wash out mouth thoroughly with water and o stomach and may be fatal give plenty of water to drink Obtain medical advice immediately Eye Persons with pre existing eye problems Irrigate thoroughly with water for at least 15 may be more susceptible to the effects minutes of the substance Obtain medical advice immediately Corrosive May cause redness pain blurred vision and eye burns Contact can result in the permanent loss of sight Inhalation Persons with pre existing impaired Remove to fresh air respiratory function may be more susceptible to the effects of the Rest and keep warm substance Obtain medical advice if applicable 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 N A LO Document Ref P0107 800 06 September 2013 Page 21 9 Ell CO User Manual Warranty information We provide the following Warranties for the Ell CO Document Ref P0107 800 06 September 2013 Page 22 A 3 year electronics warranty A 1 year sensor warranty In both cases the Warranty period runs from the date of our invoice We warrant that the equipment will be free from defects in workmanship and
19. unction is not active Flow adaptor fitted 3 Open the control valve of the flow indicator to set the flow indication ball between the two markers Allow the gas to flow over the sensor until the display reading is settled This should take no more than 2 minutes N A LO Document Ref P0107 800 06 September 2013 Page 19 Ell CO User Manual Flow indicator set 4 Adjust the calibration knob until the display reads Oppm If this is not possible refer to Section 5 Display set to 000 5 Close the air gas cylinder remove the push in calibration adaptor and re fit the sample dome The analyser is now ready for bump testing Document Ref P0107 800 06 September 2013 Page 20 NALO Ell CO User Manual 8 Safety information When the life of the battery has expired it should be disposed of safely in accordance with local regulations 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 sensor contains an acidic electrolyte which is hazardous In the event of an accident use the following first aid procedures BodyPart Eea SS First Aid Procedures Skin Contact could result in a chemical burn Immediately flush the skin thoroughly with water for at least 15 minutes Persons with pre existing skin disorders may be more susceptible to the effects Remove contaminated clothing and wash of the substance before
20. xide in a heliox or trimix gas a helium compensation factor should be applied to the measured value See section 4 for details of the helium sensitivity effect and how to apply the helium compensation factor WARNING Very high flows may pressurise the sensor and inaccurate readings or sensor damage will result 2 6 Maximum allowable CO exposure levels The maximum allowable CO exposure levels for air diving vary in the standards set form one country to another so you may want to consider referring to the applicable safety standards for your county to determine your maximum allowable CO exposure level However Analox advises that the maximum allowable CO exposure levels should be to that stated in the British Health and Safety Executive HSE DVIS9 rev1 document Diver s breathing air standard and the frequency of examination and tests Diving Information Sheet No 9 Revision 1 This states that Carbon monoxide content shall be as low as possible but not exceed 3 ppm For air diving to 50metres N A LO Document Ref P0107 800 06 September 2013 Page 9 Ell CO User Manual 3 Pre use checks WARNING Do not leave the analyser in direct sunlight this may result in the analyser failing the Zero set calibration 3 1 Zero set Zero calibration performed in clean air is essential before every use and is performed as follows 1 Expose the analyser with sampling dome disconnected to clean air for two minutes and adjust th
21. you feel the gasket compress do not over tighten the screws 8 Push on the sampling dome NOTE When a new sensor is fitted a full calibration MUST be performed see section 7 for details of calibration and section 11 for details of calibration kits available N A LO Document Ref P0107 800 06 September 2013 Page 17 Ell CO User Manual 6 3 General care Although designed to be water resistant the Ell CO should not be intentionally immersed in liquid or left outside unprotected The Ell CO is built to resist the effects of day to day shocks and drops but remember it is an electronic measurement device and should be looked after carefully to give long trouble free service To clean the Ell CO use a damp soft cloth Protect the Ell CO from long periods of direct sunlight and do not subject it to high or low temperature extremes The sensor in the Ell CO is an electrochemical device and contains an acidic electrolyte Always check to make sure that it is not leaking See section 8 for safety information In the event that you do come into contact with the electrolyte wash the contaminated part with copious amounts of water see Section 8 6 4 Sensor handling information Ell CO carbon monoxide sensors are normally supplied in sealed packs Before the pack is opened check that the sensor has not leaked The sensors are themselves sealed and do not under normal circumstances present a health hazard however if leakage of the ele
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