OIL ON WATER ALARM, TYPE OF
Contents
1. 7 As Troubleshooting 7 5 Principle 7 6 Installatioli s ient tote team Lie euni nte IRR ERES page 9 6 1 Example OF Installation t EL b tee dile dee e page 10 6 2 GItlinig reguirements cians o le te on ted page 10 6 3 Installation practice eene dee eee ede ded ela t e eene edd etn page 11 6 4 Piping Connections x t be ete batte Eb pte lud se ea Lu ete prse lu tdg page 12 6 5 Electrical connections i cs t e e p E n ed pela M eget bL mb ie page 13 T Standard specifications esee eec ede need ede eed eee cage ded eee da ae ea eee page 17 ISMA Rue Hector Malot 57600 FORBACH France Page2 T l 03 87 87 62 16 Fax 03 87 88 18 59 E mail contact isma fr Internet www isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau SAFETY CAUTIONS Do not directly stare at the light source The light source is near infrared ray Its energy per unit area is approximately 1 2 times as large as sun light Do not stare at the light source and do not place any mirror reflection object such as mirror and w2. e Installation apart from water surface This equipment utilizes the reflection coefficient difference by the equipment installed apart from water surface We frequently experience that the oil film on water surface looks glaring in everyday life This is due to the fact that oil reflects visible light better than water that is to say reflection coefficient of oil is larger than that of water When the incident light comes to the boundary surface of two substances with different reflection coefficient the reflection coefficient is calculated as follows Incident light Reflected light reflection coefficient n2 gt n1 reflection coefficient of water oil etc ISMA Rue Hector Malot 57600 FORBACH France Page 10 T l 03 87 87 62 16 E mail contact isma fr Fax i 03 87 88 1 8 59 Internet 1 WWW isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL n2 reflection coefficient of air Reflection coefficients of various liquids are as listed in the following table Oils are not pure substance and their reflection coefficients have some ranges The list gives approximate values As know from these values reflection coefficient of water surface 2 reflection coefficient of oil film 3 4 Then the reflection coefficient exhibits an increase of 50 100 by the presence of oil film Therefore when the water surface is irr
3. other details connect a conduit to the cable port at the top of the sensor to mount the sensor almost upright The distance between the bottom end of sensor and the water surface should be 0 5m To perform light axis setting secure the light axis adjusting function that allows directional change in two directions by about 2 against the vertical line Erect a 50A steel pipe at a place which meets requirements and mount the transmitter on the pipe 1 72 Hector Malot 57600 FORBACH France Page 14 T l 03 87 87 62 16 E mail contact isma fr Fax i 03 87 88 1 8 59 Internet 1 WWW isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau 6 4 Piping connections when there is high humidity corrosive gas and dewing on the window glass apply air purge and air curtain optional with dry air to the system Air purge of transmitter Connect 4x 6mm nylon tube to the air inlet half union on the bottom surface of transmitter to supply dry air Dry air instrumentation air or equivalent Pressure 0 4kg cm G Flow rate 2NI min caution Never supply air to the system unless specifications include air purge Air pressure may cause damage to the system since the air outlet is blocked Air curtain of sensor I Pax 92 1 aan R 1 4 Supply dry air to the air in
4. transmitter 50A pole mount optional Materials Indicator transmitter ABS resin and AC7A corrosion resistant cast aluminium Dimensions Indicator transmitter 2170 300 Sensor 0112 242 ISMA Rue Hector Malot 57600 FORBACH France Page 19 T l 03 87 87 62 16 Fax 03 87 88 18 59 E mail contact isma fr Internet www isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 Au servicedel eau OIL ON WATER ALARM TYPE OF 10 USER MANUAL Refer to drawing of dimensions Weight Indicator transmitter approx 4kg Sensor approx 2kg Paint colour Indicator transmitter metallic silver lemon yellow Sensor metallic silver Installation conditions Waterway wall bridge on waterway manhole resistant to direct sun light Water surface distance 0 5x0 2m bottom end of monitor to water surface only when light axis is set at 0 5m of the distance Cable connection port Gland for 212mm cable 3 pcs Gland for 5mm cable 1pc for extension cable Extension cable Dedicated cable for connection between sensor and transmitter Extension cable length 10m standard ISMA Rue Hector Malot T l 03 87 87 62 16 Fax 03 87 88 18 59 57600 FORBACH France Page 20 E mail contact isma fr Internet www isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499
5. ER ALARM TYPE OF 10 USER MANUAL Au servicedel eau Caution Such oil that does not spread as the film has a not horizontal surface which is hardly detected When it is difficult to drip on the actual water surface for operation check Confirm that the oil film passes the point beneath the sensor and the oil film sensing contact output is provided within 20 seconds This signal is reset 15240 seconds after disappearance of the oil film Short term shutdown Short term shutdown completes merely by turning the power switch to OFF Note Continue air purge and or air curtain if used during the short term shutdown Long term shutdown Turn off the power switch Stop air purge when air purge and or air curtain is used Stop air curtain when air purge and or air curtain is used Restarting procedure in this case is as follows Clean the window glass of sensor Provide instrument air flow for about 30 minutes when air purge and or air curtain is used Turn on the power switch 3 MAINTENANCE 3 1 Maintenance schedule Perform maintenance as follows for stable use of OF 10 3 2 Desiccant replacement Insulation drop due to humidity rise within the transmitter causes malfunction When the transmitter cover is removed for maintenance be sure to check the desiccant silica gel If the silica gel is not effective when coloured red replace the silica gel by a fresh pack of silica gel Back of transmitter Desiccant si
6. OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau USER MANUAL ISMA Rue Hector Malot 57600 FORBACH France Page 1 T l 03 87 87 62 16 E mail contact isma fr Fax i 03 87 88 1 8 59 Internet 1 WWW isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau CONTENTS DalelyCAUtlONS but d ttt evt euet 1 1 General 1 335 5 5 hint ate eie tea E E page 1 2 4OD6rallOn t ote i et a etui e ated trata f co der page 1 2 4 Functions ol SWICheS i t t t M t ted page 2 2 2 Sfartup procedure o m t d dd e e a e Ue e page 2 2 3 Window glass cleahifhig 5 i 3 2 4 Eighittaxis adj stment oe esp m 4 2 5 Operation Check i t dn He tee e dt ne ae ae page 5 2 5 ShUtaoWIT5 deret 6 3 Malhtenance eio cis Set het ed cating ot deena page 6 3 1 Maintenance schedule eise 6 3 2 0 oec e t ea tete Pea De ERR Ux e MERE page 6 2 3
7. adiated by a light of constant intensity such as laser beam oil film can be detected by the intensity difference of reflected light Reflection coefficient of various liquids Substance N Substance N Air 1 00 Xylene 1 50 Water 1 33 Paraffine oil 1 48 Gasoline Above 1 40 Linseed oil 1 48 Kerosene Above 1 45 Olive oil 1 47 Gas oil 1 45 1 50 Coconut oil 1 45 Heavy oil Above 1 45 Soybeen oil 1 47 Benzene 1 50 Whale oil 1 47 Toluene 1 50 Cod liver oil 1 48 Generally the detection limit of oil film can be visually recognized The film thickness is not more than 1um and the reflected light intensity does not increase with the increase of thickness but keeps a constant reflected light intensity As shown in the above table almost all oils have a reflection coefficient above 1 40 therefore oil film detection is possible if only a smooth oil film can be formed The light of LED pulse modulated by the modulation circuit passes the collimate lens forming a light beam to irradiate the water surface to be monitored The reflected light from the monitored water surface enters the light receiver through the condenser lens The light is amplifier and the band pass filter to remove disturbance components The signal component alone enters the peak hold circuit to keep each peak value for about 16 seconds When the hold value rises above about 150 of the stationary water level above 45 FS in meter reading an
8. cable power line and signal output line cable must be correctly connected For air purge provide an instrument air stream for approximately 30 minutes This is to clean the transmitter inside e Clean the window glass e Remove the cover and supply power and turn the power switch to ON e Perform light axis adjustment e Confirm that the transmitter cover is attached e Confirm the transmitter operation Now the monitor is in routine run ISMA Rue Hector Malot 57600 FORBACH France Page 4 T l 03 87 87 62 16 E mail contact isma fr Fax i 03 87 88 1 8 59 Internet 1 WWW isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau 2 3 Window glass cleaning Cover Cover removal Window glass Dust or garbage on the window glass drops the sensitivity and reduces the ability of oil film sensing Periodically clean the glass Clean with gauze soaked with alcohol then finish with dry gauze Increase the maintenance frequency in early spring accompanied by strong wing and in rainy season of high humidity When the window glass is frequently fouled apply air curtain optional refer to 6 4 2 4 Light axis adjustment Light axis deviation drops the signal level leading to oil film sensing impracticability When the indication is always below 25 of fullscale and window glass cleaning cannot restore the sensing capability perform li
9. dewing on the window glass apply air curtain optional to the sensor In the rainy season the use of air curtain is recommended from the beginning since dewing is apt to occur on the glass Installation practice Minimum corrosive gas and dust Minimum vibration and impacts No nearby inductive equipment and welders ISMA Rue Hector Malot 57600 FORBACH France Page 13 T l 03 87 87 62 16 E mail contact isma fr Fax i 03 87 88 1 8 59 Internet 1 WWW isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau Dimensions _Cable out let Wii i Air inlet Air outlet installation of stationary type equipment refer to the installation example and dimensions for actual installation Adjust the distance between the sensor bottom end and the water surface at 0 5m the adjustment of the distance is made by loosening holder tightening bolts and moving the sensor pole up and down when up and down motion of the pole is insufficient for adjustment adjust the pole base mounting position of the hanging arm Mount the transmitter on the pole base and fasten it with the lock screw Route the extension cable after adjusting the distance between the bottom end of sensor and the water surface Considering the convenience of sensor removal Secure a cable sag at the cable outlet of sensor pole and between the hanging arm and the pole base
10. ght axis adjustment Perform light axis adjustment on a day of no wind and no ripples on the water surface by a method which does not make ripples Caution Perform this adjustment after confirming that no oil film is present on the water surface adjustment procedure First confirm that the distance between the low end of the sensor and the monitored water surface is 0 5m Remove the transmitter cover and turn the CHECK MEASURE switch to CHECK Adjust the direction of the sensor as shown the following a b and c to find the point where the meter reads the maximum value approximately 30 of fullscale Note When there are ripples on the water surface to be monitored generated waves can be partly eliminated by immersing the supplied wave protector assembly by about 75 ISMA Rue Hector Malot 57600 FORBACH France Page 5 T l 03 87 87 62 16 E mail contact isma fr Fax E 03 87 88 18 59 Internet a www isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau Green GAIN control Switch of check measure Light axis is adjusted with front back adjust bolts 2 pieces and right and left adjust bolt of the light axis adjustment section By loosening the upper front back adjust bolt and tightening the lower front back adjust bolt the sensor moves backward and vice versa By loosening upper right left adjust bolt and tightening
11. let of the sensor using the nylon tube of 2 4x 3 2mm and joint designated in air curtain specifications Dry air Instrument air or equivalent ISMA Rue Hector Malot 57600 FORBACH France Page 15 T l 03 87 87 62 16 E mail contact isma fr Fax i 03 87 88 1 8 59 Internet 1 WWW isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Pressure Set as shown the table according to the length of 2 4x 3 2mm tube Tube length vs pressure Tube length m 2 4 6 8 10 Supplied pressure kg cm 0 1 0 2 0 3 0 4 0 5 Flow rate 5nl min CAUTION When air curtain is not include in specifications never supply air to the system The air pressure may cause a damage to the system since the air curtain port is blocked 6 5 Electrical connections Cable routing Cables to be used Name of line Cable species Cores Overall diameter Power input line CV V 0 5 1 25mm 2 3 12mm Output line CV VS 0 5 1 25mm 2 12mm Contact output line CV V 0 5 1 25mm As required 12mm Sensor extension cable terminals 1 7 The sensor end of the cable is already wired before shipment The cable must have a margin length considering the need for sensor removal in maintenance Power line terminal No 90 91 E supply a power source like the commercial power source whose common side is grounded Supply the power from a power line
12. lica gel ISMA Rue Hector Malot 57600 FORBACH France Page 8 T l 03 87 87 62 16 E mail contact isma fr Fax i 03 87 88 1 8 59 Internet 1 WWW isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau Maintenance object Control period 6 VA aie g Reference Object Item Description s8 8 8 8 5 59 lt lt lt 0 11 Window glass Cleaning Remove fouling A A 2 3 2 Light axis Adjustment Adjust the rtimpot at a point where the O 24 adjusting section meter pointer deflects the max value Adjust sensitivity too if necessary 3 desiccant replacement Replace the desiccant inside the Li 3 2 equipment O check for abnormality Perform specified work Make specified adjustment A make cleaning of specified places O replace specified part for maintaining the performance 3 3 Fuse replacement ATTENTION When the fuse has been blown replace it by the following procedure Shut off the power input but not turning off the power switch Remove the cause of the trouble Replace the fuse by a new one Put the fuse cap as it was and supply the power Fuse1A t Power switch ISMA Rue Hector Malot T l 03 87 87 62 16 Fax 03 87 88 18 59 57600 FORBACH France E mail contact isma fr Internet www isma fr Page 9 OF 10 Notice de mise en ser
13. oil film sensing contact output is delivered System diagram o 8 DL film memi contact cutput Senaing laprectle able contest i output Peak hold Dutput circuit miaa OF Conatent currant e dd cirpwit a Pg jenes A a Fi linker surface System ISMA Rue Hector Malot 57600 FORBACH France Page 11 T l 03 87 87 62 16 Fax 03 87 88 18 59 E mail contact isma fr Internet 1 WWW isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL When the hold value drops below about 67 below 20 FS in meter reading by some reason large waves obstacles vapour on water surface dewing on window glass etc and this condition lasts for about one minute a sensing impracticable contact output is delivered ISMA Rue Hector Malot 57600 FORBACH France Page 12 T l 03 87 87 62 16 E mail contact isma fr Fax 03 87 88 18 59 Internet www isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau 6 INSTALLATION 6 1 Example of installation An installation example using the pole stand optional and hanging arm optional is a shown below Unit mm Installation of ststionary type 6 2 Sitting requirements The place of installation should meet the following requirements Sensor installati
14. on requirements Mild ripples High ripples and whirls on the water surface to be monitored may cause reduction of reflected light which leads to loss of sensing ability Strong rain on the water surface to prevent direct exposure of the water surface to rain Note When the reflected light quantity drops to a value which can not be detected and the condition lasts for about one minute a sensing impracticability contact signal is delivered Minimum water level variation When the light axis is adjusted with 0 5m of the distance between the sensor bottom end and the water surface sensing is possible for water level variation of 0 2m 0 3mz0 7m but use the monitor at a place of minimum level variation Note Only when there is a slow undulation on the water surface to be monitored oil film can be detected within 0 3 1m range of distance between the sensor bottom end and the water surface In this case however adjust the light axis for 1m of the distance If the light axis for 1m of the distance If the light axis adjustment is made for a distance over 1m a malfunction will result No water vapour generation on the water surface water vapour on the water surface causes light scattering and dewing on the window glass disturbing oil film detection A sensing impracticable contact output is delivered in this case Notes When water vapour is present on the water surface send wind which does not cause ripples to blow off vapour To prevent
15. orded by connecting a recorder to the output System configuration Transmitter sensor N Standard accessories Refer to the accessories list Configuration of oil on water alarm ISMA Rue Hector Malot 57600 FORBACH France Page 3 T l 03 87 87 62 16 E mail contact isma fr Fax i 03 87 88 1 8 59 Internet 1 WWW isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau 2 OPERATION 2 1 function of switch Green zone Power indicator Meter Gain control used for sensitivity adjustment reflected light level of water adjustment Fuse Power switch CHECH MEASURE switch turned to CHECK when light axis is adjusted and the peak hold function is released And the indication largely fluctuates by ripples on water surface Be sure to turn this switch to MEASURE when in measurement When the switch is in CHECK position the transmission signal drops about 4mA delivering a Sensing impracticable contact output 2 2 Names and functions of switches Confirm the installation is completed before starting operation If not complete follow the procedure of section 6 confirm that the following requirements are met e Inthe case of the stationery type the distance between the low end of monitor and the water surface shall be 0 5m e Air piping must be properly made for air purge and air curtain e sensor extension
16. other than that for power consuming equipment Grounding line grounding terminal E be sure to ground with a grounding resistance below 1000 Use a 3 core power line cable and ground the third wire at the distribution board Connect the grounding line to the ground other than that of power consuming equipment Output line terminals 70 71 the output is about 4mA with no reflected light and about 8 8mA with reflected light from stationary water surface Make electrical connections as required Ground the shielding of the cable at the receiver side 4 20mADC max load 6000 isolated type oil film sensing contact output line terminal 30 32 When the reflected light quantity rises above 150 about 45 of meter scale of the stationary water level a contact output is delivered within 20 seconds ISMA Rue Hector Malot 57600 FORBACH France Page 16 T l 03 87 87 62 16 E mail contact isma fr Fax i 03 87 88 1 8 59 Internet 1 WWW isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Contact capacity 125VAC 0 2A or 30VDC 1A with resistive load Au servicedel eau Note The oil film sensing contact output is delivered even when the power is OFF Sensing impracticable contact output line Terminals 33 35 When the reflected light quantity drops below about 67 about 20 of the meter of the stationary water level and that condition lasts for more
17. r Page 18 OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL 7 STANDARD SPECIFICATIONS Product name Oil on water alarm Model OF 10 Measurement object Floating oil film on water Measurement method Reflection coefficient measurement by near infrared beam Light source Near infrared LED Light output Approx 2mW Monitoring area Approx 20mm with 0 5m if sensing Distance approx 5mm Response time Within 20 sec the time from oil film sensing to alarm output Ambient conditions Temperature 5 50 C Humidity 85 RH max Sample temperature No freezing no water vapour generation contact DKK when vapour is generated Output 4 20mADC max load 6000 isolated I O approx 8 8 for reflected light on stationary water Alarm contact Oil film sensing contact output Contact capacity 125VAC 0 2A resistive load or 30VDC 1A resistive load Power requirements 100VAC 10 50 60Hz 110VAC 10U 50 60Hz optional Power consumption Approx 5VA Air Air purge for transmitter optional joint for 4x 6mm resin tube dry air instrument air or equivalent 0 4kg cm G approx 2N min Air curtain for sensor optional R PT dry air instrument air or equivalent 0 1 0 5kg cm G 5nl min Construction Rainproof transmitter and sensor Mounting Indicator
18. rist watch in the light path The reflected light from water and oil surface is not dangerous sure to round the grounding terminal with a grounding resistance below 1000 Be sure to turn off the power when electrical connections are made and parts are replaced 1 GENERALITES This equipment is the sensor alarm to monitor the presence of oil film on the water surface continuously It utilizes the fact that the reflection coefficient of oil is larger than that of water The light source is the high brightness LED The monitor features the non contact monitoring above the water surface Outline of start up procedure Step Description reference Installation Mounting and wiring of sensor and 6 transmitter Operation Perform window glass cleaning light axis adjustment and operation test 2 Routine run Features almost all species of oils can be detected by employing the reflection coefficient measurement method A high brightness LED Light Emitting Diode is used as the light source Non contact monitoring of sample water Sensing impracticable contact output is delivered when the reflected light quantity is so dropped that oil cannot be detected Peak hold circuit free from the effect of dust that passes on the monitored water surface Garbage stagnation on the monitored water surface causes a sensing impracticable contact output Besides the oil film sensing contact signal oil film generation can be rec
19. than one minute an alarm signal is delivered Contact capacity 125VAC 0 2A or 30VDC 1A with resistive load ISMA Rue Hector Malot 57600 FORBACH France Page 17 T l 03 87 87 62 16 E mail contact isma fr Fax 03 87 88 18 59 Internet www isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Note The sensing impracticable contact output is delivered when the transmitter check switch CHECK MEASURE is in check and when the power supply is shut off CAUTION When an inductive load is connected to the sensing impracticable contact output be sure to insert a surge absorber in the load side for contact protection P 4 couvercle make connections to each terminal blocks of the transmitter by the following procedure remove the gland to open the transmitter interior to the atmosphere As shown above move the cover by the numeric order in arrow directions to remove the cover Introduce each cable into the transmitter via gland Tighten each gland securely to guarantee air lightness of the transmitter CAUTIONS be sure to turn off the power source whenever connections are made The use of lightning protector is recommended to the power line and output line prevent the damage due to thunderbolt ISMA Rue Hector Malot T l 03 87 87 62 16 Fax 03 87 88 18 59 57600 FORBACH France E mail contact isma fr Internet www isma f
20. the lower right left adjust bolt the sensor moves leftward and vice versa On completion of adjustment fasten the sensor by tightening four adjust bolts Turn the CHECK MEASURE switch to MEASURE Note The switch must be turned to MEASURE during operation If turned to CHECK oil film cannot be detected after about 20 seconds confirm the meter pointer is within the green zone If the indication deviates from the green zone between 25 28 or between 32 35 adjust the GAIN control so that the indication comes into the green zone Notes when the indication is below 2596 do not adjust the GAIN control but perform light axis adjustment again when the indication is above 3596 check the water surface for oil film sensor Wave protector assembly sensor ISMA Rue Hector Malot 57600 FORBACH France Page 6 T l 03 87 87 62 16 E mail contact isma fr Fax E 03 87 88 1 8 59 Internet www isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau 2 5 Operation check Produce an oil film on the water surface Heavy oil A is suitable for this purpose because it forms oil film rapidly and the film can be easily seen ISMA Rue Hector Malot 57600 FORBACH France Page 7 T l 03 87 87 62 16 E mail contact isma fr Fax 03 87 88 18 59 Internet www isma fr OF 10 Notice de mise en service et maintenance ANGLAIS 210499 OIL ON WAT
21. vice et maintenance ANGLAIS 210499 OIL ON WATER ALARM TYPE OF 10 USER MANUAL Au servicedel eau 4 TROUBLESHOOTING When an abnormality of indication of the transmitter is encountered take appropriate actions by the following table Symptom Cause Remedy Reference Unstable indication Fouled window Clean the window glass 2 3 Light axis deviation Light axis adjustment 2 4 High ripples on water surface Remove ripples Select rippleless place Abnormal electric circuit Contact agent Insulation drop Desiccant replacement 3 2 No indication Obstacles and whirl on water Remove them abnormally low surface Light axis deviation Light axis adjustment 2 4 Fouling on glass window Window glass cleaning 2 3 Dewing on window glass Perform air curtain 6 4 Water vapour on water Glow off the vapour without vapour producing ripples Abnormal electric circuit Contact agent Insulation deterioration Desiccant replacement 3 2 Power is not supplied Blown fuse Fuse replacement 3 3 Power failure Supply electricity 5 PRINCIPE OF MEASUREMENT Method and principle of detection Various methods of oil film detection are available They can be classified as follows e The method by the difference in buoyancy e The method by the difference in reflection coefficient e The method by the difference in dielectric constant classification by installation method e Floating on water surface
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