Selecting the right float switch

Selecting the right float switch 2 There are different methods for selecting the right float switch for a particular application. This note suggests one such method. 1. Physical arrangement and choice of float switch style. The choice of styles that may be suitable for an application will depend on the physical arrangement of the tank, the available mounting positions and whether access is available to the inside of the tank. Consideration should also be given to whether there is the possibility of a build up of deposits, from the liquid, on the float body. These deposits can, over a period of time, accumulate to such an extent that the float switch can fail to operate. There are particular series designed to limit the effects of this build up. There are also choices, for some series, of mounting thread. 2. Material selection The selection of most suitable materials, for float switch and gasket, can be made by reference to the Chemical Compatibility chart (www.crydom.co.uk). This gives a good indication of the suitability, of the float switch materials, in a wide range of liquids. It may be necessary, for some liquids, to obtain a sample float switch to test the compatibility. 3. Electrical It is important to fully understand the nature of the load, to be switched by the float switch, and to make sure that the switch is capable of handling this load. The electrical ratings, shown in Crydom float switch specifications, are all for purely resistive loads. Any loads that have either inductive or capacitive components should have the appropriate contact protection measure applied, by reference to the Circuit Hazards and Contact Protection (www.crydom.co.uk) application note. 4. Cables Crydom has standard, UL approved, cable types for the various float switches, which are shown on the product data sheets. Other cables, or connectors, can be supplied subject to special quotation and order. 5. Options Crydom has, over the years, produced many variants of its float switches to match particular customer requirements. Please contact Technical Support for advise about any particular special requirement

13 SLP4 Submersible level probe Submersible probe Low space requirement Cable mounted N/O or N/C configurable No power requirement This is a single switch point liquid level probe, for use in water or acqueous liquids, designed to be suspended into the liquid by its cable. It can be configured to give make or break action on either rise or fall, by removing the protective shield and reversing the float orientation. The switching level may be adjusted by varying the cable length. The reedswitch contact is suitable for switching signal levels, up to 50 volts. The main uses for this probe are level switch for narrow boreholes, or applications with restricted space, and also as a signal switch for reservoir high or low level monitoring. These are manufactured with standard PVC cable lengths of 15 or 25 metres but can be manufactured with other lengths. Other switch types and configurations, cable gland and cable type are possible, please contact Crydom with your requirement. TECHNICAL SPECIFICATIONS Float Polypropylene Housing Stainless Steel Shield Stainless Steel Cable gland Nylon Cable 2 core PVC sheathed Cable length 15M 25M Temp. Range C -20 / +75 F -4 / +167 Min. Fluid S.G. 0.8 Max working pressure 5 bar ELECTRICAL SPECIFICATIONS Contact Form N/O (N/C) VA Rating Max. 25 Switching Voltage AC/DC Max. 50 Switching Current Max. A 0.6 All ratings are for resistive load only Crydom no. SLP4AP15 SLP4AP25 Cable length 15 metres 25 metres OUTLINE DIMENSIONS Cable 2 Core PVC Cable Gland: IP68 CONTACT US NOW UNITED KINGDOM CRYDOM T F E W T F E W +44 (0) 1202 897969 +44 (0) 1202 891918 magnetics@crydom.com www.crydom.co.uk USA CRYDOM +1 619 2101600 +1 619 710 8540 sales@crydom.com www.crydom.com 160.0 Nom. 35.00 Nom. Body: Stainless Steel Float Shield: Stainless Steel Perforated Float Switch: Polypropylene SLP4 Submersible level probe

FFS Series The FFS series of cable end float switches are designed for controlling levels in large tanks, cisterns or reservoirs and can be directly installed on submersible pumps. The casing is manufactured in blow moulded Polyethylene (PEHD), with 5m PVC cable with protective earth conductor as standard. The switching element is a microswitch, with UL, VDE and CENELEC approvals, activated by a moving stainless steel ball and having an electrical life of 200,000 operations. Non hygroscopic closed cell expanded polyurethane is injected around the switch housing within the outer casing, hermetically sealing the unit. It is capable of working down to 100 metres depth in water. 14 Other models, including versions for use in fuel oils, are available. Please contact our sales office for details. Technical Specifications FFS10A FFS10B FFS10C FFS20A FFS20B FFS20C Contact Form A B C A B C Material MECHANICAL 83.0 O 52.0 Adjustable Counterweight/Pivot Min Pivot Length 120mm High Density Polyethylene Temp Range C 0 / +55 F + 32 / +131 Standard cable PVC (Length 5m) U cable option for Fuel oils Max. working pressure Electrical Specifications Polyurethane 10 bar Power Rating AC : 750 VA DC : 180W AC : 1500 VA DC : 360W Switching Voltage AC : 250 V DC : 110 V AC : 250 V DC : 110 V Switching Current Max. Resistive 10 A 20 A Switching Current Max. Inductive AC : 4A DC : 1 A AC : 8A DC : 2 A Direct power switching Cable mounting 100 metre depth capability 134.0 30 30 ON - OFF Differential 61.0 OFF - ON FFS Series

15 FFS Series WRAS APPROVED Direct power switching Cable mounting WRAS Approved 100 metre depth Capability These switches are manufactured with an outer case of blow moulded PEHD (High Density Polyethylene) and an intermediate filling of non-hygroscopic closed cell polyurethane foam around a sealed switch housing. They can be supplied with either make on rise (N/O), make on fall (N/C) or change over (C/O) switching action. The N/O and N/C versions have an earth protection wire within the 5 metre cable, which can be either PVC (for general purpose applications) or WRAS approved (for drinking water applications). External counterwights are supplied to adjust the pivot position. Contact Crydom for other cable types and lengths. Material Specifications Body Material High Density Polyethylene Cable sheath material PVC or WRC approved Cable length 5 metres standard (10 to 100 optional) Temperature range C 0 to 55 C F + 32 / +131 Max. working pressure 10 bar Technical Specifications Switching element 10 Amp 20 Amp Max power DC 750VA/AC DC 750VA/AC 180W 360W Switching Current Max. Resistive 10A 20A Switching Current Max. Inductive DC 1A / AC4AC DC 2A/AC8A Switching Voltage Max. DC 110 / AC250 DC 110/250 INSTALLATION cable entrance cable CONTACT US NOW UNITED KINGDOM CRYDOM T F E W T F E W +44 (0) 1202 897969 +44 (0) 1202 891918 magnetics@crydom.com www.crydom.co.uk USA CRYDOM +1 619 2101600 +1 619 710 8540 sales@crydom.com www.crydom.com wiring diagram for filling pump external counterweight differential pipe wiring diagram for emptying pump tie FFS Series WRAS APPROVED

FFSMC Multi-contact float switch Submerged type float switch for sewer and industrial waste systems. This self-weighted cable end float switch is designed for use in turbulent industrial fluids and fluids with suspended agglomerates, such as sewer water. The switch is water resistant up to a depth of 100m, and is insensitive to humidity and condensation, due to the particular design of the switch element. This makes it suitable for applications where there may be wide or rapid fluctuations in ambient or fluid temperatures. Switching capacity of this new design of self-cleaning switch element is 10A at 250V ac. The outer casing is manufactured in blow moulded Polyethylene (PEHD) and the switch element is surrounded by non-hygroscopic closed cell expanded polyurethane, hermetically sealing the unit. The switch is fitted with an internal weight such that it fixes the centre of gravity, and rotation, close to the cable entry. An external counterweight is supplied to adjust the pivot position. The moulding shape is rounded to prevent the accumulation of solids, that could cause the float to sink. Technical Specifications FFSMC10A FFSMC10B FFSMC10C Contact Form A B C Material High Density Polyethylene Temp Range C 0 / +55 F + 32 / +131 Cable (standard length 5m) With protective earth no earth Standard cable covering PVC U cable option for Fuel oils Polyurethane Max. working pressure 10 bar Electrical Specifications Power Rating AC : 750 VA DC : 180W Switching Voltage AC : 250 V DC : 110 V Switching Current Max. Resistive 10 A Switching Current Max. Inductive AC : 4A DC : 1 A It is necessary to use an auxiliary relay, when switching pump motors or any loads that are not purely resistive. MECHANICAL Model for diesel oil Operates in Turbulent Fluids Unaffected by Suspended Solids Cable Mounting 100m Depth Capability Model for sewer water 16 15 15 Off - On Differential On - Off 190 82 FFSMC Multi-contact float switch

17 FFSMC Multi-contact float switch Part Numbering System Series Max. current Contact Form A = n/o B = n/c C = c/o Installation FFSMC 10 A U 1000 Cable length in cms: Blank = 5M standard Cable covering: Blank = PVC U = Polyurethane N = Neoprene S = Silicone cable entrance cable external counterweight differential tie pipe wiring diagram for filling pump wiring diagram for emptying pump FFSMC Multi-contact float switch

FFSMC Series WRAS APPROVED Submerged type float switch for reservoir and industrial waste water systems. This self-weighted cable end float switch is designed for use in turbulent water and water with suspended agglomerates, such as sewer water. The switch is water resistant up to a depth of 100m, and is insensitive to humidity and condensation, due to the particular design of the switch element. This makes it suitable for applications where there may be wide or rapid fluctuations in ambient or water temperatures. Switching capacity of this new design of self-cleaning switch element is 10A at 250V ac. The outer casing is manufactured in blow moulded Polyethylene (PEHD) and the switch element is surrounded by non-hygroscopic closed cell expanded polyurethane, hermetically sealing the unit. The switch is fitted with an internal weight such that it fixes the centre of gravity, and rotation, close to the cable entry. An external counterweight is supplied to adjust the pivot position. The moulding shape is rounded to prevent the accumulation of solids, that could cause the float to sink. Technical Specifications Crydom part FFSMC10AW FFSMC10BW FFSMC10CW Contact Form N/O N/C C/O Switching Current Max. Resistive 10 A Switching Current Max. Inductive AC 4A DC 1A Power Rating AC VA 750 DC W 180 Switching Voltage AC V 250 DC V 110 Cable Material WRC approved PVC Cable length Standard length 5 metres Body Material High Density Polyethylene Temperature Range C 0 / +55 F + 32 / +131 Max. working pressure bar 10 It is necessary to use an auxiliary relay, when switching pump motors or any loads that are not purely resistive. MECHANICAL 15 15 Off - On Differential On - Off 190 Model for diesel oil Operates in Turbulent Fluids Unaffected by Suspended Solids WRAS approved Cable Mounting 100m Depth Capability Model for sewer water 18 82 FFSMC Multi-contact float switch

19 FFSMC Series WRAS APPROVED Part Numbering System Series Max. current Contact Form A = n/o B = n/c C = c/o FFSMC 10 A U 1000 Cable length in cms: Blank = 5M standard Cable covering: Blank = PVC U = Polyurethane N = Neoprene S = Silicone Installation cable entrance cable external counterweight differential tie pipe wiring diagram for filling pump wiring diagram for emptying pump FFSMC Multi-contact float switch

LM10 series This is suitable for use in water, industrial wastewater and sewage, that can have wide variations of temperature. This small design of switch is for use in more confined spaces, where there is not enough room for the larger FFSMC type. The rounded body design and floating attitude prevents accumulation of solids on the body. The switch has additional internal ballast, to bring the centre of gravity and rotation close to the cable entry point. The switching element is a self cleaning type, that makes the complete switch insensitive to humidity and condensation, allowing this type to operate in widely fluctuating temperatures. The switch contacts are rated at 10 Amp resistive. Supplied, as standard, with 5 metres cable and adjustable counterweight. Technical Specifications LM10A LM10B LM10C Contact Form N/O N/C C/O Material High Density Polyethylene Temp Range C 0 / +55 F + 32 / +131 Cable (standard length 5m) With protective earth no earth Standard cable covering PVC U cable option for Fuel oils Polyurethane Max. working pressure 10 bar Electrical Specifications Power Rating AC : 750 VA DC : 180W Switching Voltage AC : 250 V DC : 110 V Switching Current Max. Resistive 10 A Switching Current Max. Inductive AC : 4A DC : 1 A It is necessary to use an auxiliary relay, when switching pump motors or any loads that are not purely resistive. MECHANICAL Minimum Cable Pivot length 120mm 15 15 Off - On Differential On - Off 75 47 129 20 For smaller tanks and restricted space Use in sewer and industrial waste water Shape avoids ragging, in sewer systems Unaffected by suspended solids Operates in Turbulent Fluids LM10 Series

21 LM10 series Part Numbering System Series Max. current Contact Form A = n/o B = n/c C = c/o Installation LM 10 A U 10 Cable length in mtrs: Blank = 5M standard Cable covering: Blank = PVC U = Polyurethane N = Neoprene S = Silicone cable entrance cable differential external counterweight tie pipe wiring diagram for filling pump wiring diagram for emptying pump LM10 Series

General Container wall thickness and ease of access must be determined in order to select the fitting type required. The tank wall should be flat, as concave or convex walls can cause ineffective sealing of the float switch into the tank wall. application notes 22 Hold the float switch firmly, ensuring that the orientation of the float is correct and that the sealing washer/gasket is not impaired, and tighten the fixing nut, until finger tight. Carefully tighten the fixing nut to the appropriate torque of 3.0lbs/fl. (4.0Nm) maximum. Check the seal and orientation, before connecting the float switch to the required electrical circuit. Please note that fixing nuts should not be overtightened, as this may damage the product. Maximum wall thickness should not be exceeded or leaking may occur. Gasket Seal Nylon Nut Drill the correct size hole in the tank wall, observing the appropriate safety requirements. Remove any swarf and ensure that both faces of the hole are smooth, to avoid damage to the sealing washer/gasket. Internal fitting types, RSF10, RSF20, RSF30, RSF40, RSF50, RSF60 series. Fit the sealing washer/gasket to the float switch thread. Feed the connecting lead through the hole in the container, from the inside. Take care to ensure that the sealing washer gasket is not damaged and that it is correctly positioned against the inside face of the tank wall and the collar of the float switch. External fitting RSF70 series. Feed the compression seal/grommet, friction relief washer and fixing nut over the connecting leads and position on the float switch thread, ready for tightening. M16x2 Thread Nylon Nut Nylon Washer Compression seal for External Mount Turn the fixing nut only until the compression seal/grommet starts to deform. Hold the float switch assembly by the cable entry end and insert the assembly into the hole in the tank wall until the compression seal/grommet meets the face of the tank wall. Ensure orientation of the float switch is correct, by reference to the indicator at the cable entry. Tank Wall Gasket Seal container Feed the fixing nut over the connecting leads and position on the float switch thread, ready for tightening. Push float through tank wall Hold the float switch assembly by the cable entry end, using the flats provided, and carefully tighten the fixing nut to a maximum torque of 2.0 lbs/ft. (2.67Nm). Check the seal and orientation, before connecting the float switch to the required electrical circuit. Gasket Seal Nylon Nut Tank Wall Hold the float switch firmly, ensuring that the orientation of the float is correct and that the sealing washer/gasket is not impaired, and tighten the fixing nut, until finger tight. Compressed seal

23 External fitting type RSF80 series. This type has a ½ NPT taper thread, which can be screwed directly into a ½ BSP female thread, to provide a jam fit, or into a ½ NPT taper female thread. The tank wall, or tank wall and threaded boss, should have a minimum threaded length of 7mm and a maximum length, from the outer thread to the inner face of the tank wall, of 17mm. Thick Wall Threaded Boss Apply a compatible sealing compound, or tape, to the thread, from the outside of the tank, and rotate the assembly until it is finger tight in the thread. Tighten the assembly into the thread, using a spanner on the flats provided, until a good seal is make and the orientation of the assembly is correct (marker on cable entre end), ensuring the torque is limited to less than 5.0 lbs/ft. (6.75 Nm). Thin Wall Drill a hole in tank wall of the correct size for cutting the required thread form, or drill a hole and fit a threaded boss on or in the wall of the tank. NPT into NPT ½" NPT Taper Thread (Will fit 1/2" BSP) NPT into BSP

24 Installation instructions for Crydom float switches General Container wall thickness and ease of access must be determined in order to select the fitting type required. The tank wall should be flat, as concave or convex walls can cause ineffective sealing of the float switch into the tank wall. Please note that fixing nuts should not be overtightened, as this may damage the product. Maximum wall thickness should not be exceeded or leaking may occur.drill the correct size hole in the tank wall, observing the appropriate safety requirements. Remove any swarf and ensure that both faces of the hole are smooth, to avoid damage to the sealing washer/gasket. Internal fitting types, RSF10, RSF20, RSF30, RSF40, RSF50, RSF60 series Fit the sealing washer/gasket to the float switch thread. Feed the connecting lead through the hole in the container, from the inside. Take care to ensure that the sealing washer/gasket is not damaged and that it is correctly positioned against the inside face of the tank wall and the collar of the float switch. Feed the fixing nut over the connecting leads and position on the float switch thread, ready for tightening. Hold the float switch firmly, ensuring that the orientation of the float is correct and that the sealing washer/gasket is not impaired, and tighten the fixing nut, until finger tight. Carefully tighten the fixing nut to the appropriate torque of 3.0lbs/ft. (4.0Nm) maximum. Check the seal and orientation, before connecting the float switch to the required electrical circuit. External fitting RSF70 series Feed the compression seal/grommet, friction relief washer and fixing nut over the connecting leads and position on the float switch thread, ready for tightening. Turn the fixing nut only until the compression seal/grommet starts to deform. Hold the float switch assembly by the cable entry end and insert the assembly into the hole in the tank wall until the compression seal/grommet meets the face of the tank wall. Ensure orientation of the float switch is correct, by reference to the indicator at the cable entry. Hold the float switch assembly by the cable entry end, using the flats provided, and carefully tighten the fixing nut to a maximum torque of 2.0 lbs/ft. (2.67Nm). Check the seal and orientation, before connecting the float switch to the required electrical circuit. External fitting type RSF80 This type has a ½" NPT taper thread, which can be screwed directly into a ½" BSP female thread, to provide a "jam" fit, or into a ½" NPT taper female thread. The tank wall, or tank wall and threaded boss, should have a minimum threaded length of 7mm and a maximum length, from the outer thread to the inner face of the tank wall, of 17mm. Drill a hole in tank wall of the correct size for cutting the required thread form, or drill a hole and fit a threaded boss on or in the wall of the tank. Apply a sealing compound, or tape, to the thread of the float switch. Insert the float switch into the thread, from the outside of the tank, and rotate the assembly until it is finger tight in the thread. Tighten the assembly into the thread, using a spanner on the flats provided, until a good seal is made and the orientation of the assembly is correct (marker on cable entry end), ensuring the torque is limited to less than 5.0 lbs/ft. (6.75 Nm)

Crydom Float Switch Selector Chemicals Printed 24/06/2004 Classification Chemical PVC Nylon Polypropylene Polysulfone* PPS Viton Nitrile Silicone Organic Chemicals Acetaldehyde E5 C3 C4 - A1 E5 E5 C3 Acids - Organic Acetic Acid, concentrated (glacial) E5 E5 A2 B4 A1 D4 D5 B5 Acids - Organic Acetic Acid, dilute A2 E5 A1 B3 A1 D4 C5 B3 Organic Chemicals Acetone (Dimethyl Ketone) E5 A2 A1 D5 A1 D4 E5 C4 Alkalis Ammonia, Aqueous, dilute A2 C5 A1 A2 B2 B2 D5 B2 Alkalis Ammonium Hydroxide, concentrated B2 E5 A1 A2 D5 C3 E5 B2 Organic Chemicals Amyl Acetate E5 B3 C4 - A1 E5 E5 B2 Organic Chemicals Aniline E5 D5 A2 - A1 B4 E5 B2 Foodstuffs Beer A2 A1 A1 - - A1 A1 A1 Organic Chemicals Benzene E5 B2 C4 D5 A1 D4 E5 E5 Misc Bleach D4 C4 B3 B3 A1 E5 C5 B3 Alcohols Butanol (Butyl Alcohol) C5 C3 A1 B3 A1 - A- D5 Inorganic Chemicals Calcium Hypochlorite D5 E5 B3 B3 B2 E5 E5 B3 Organic Chemicals Cellosolve (2-Ethoxy Ethanol) E5 - - B3 A1 - C- - Organic Chemicals Chloroform E5 C5 D5 E5 D5 D5 E5 E5 Acids - Organic Citric Acid A2 C5 A1 A2 A1 A1 A1 A1 Inorganic Chemicals Copper Nitrate A2 A1 A1 - A1 A1 A2 A1 Inorganic Chemicals Copper Sulphate A2 A1 A1 - A1 A1 A2 A1 Organic Chemicals Cyclohexane E5 A2 E5 B3 A1 D5 A1 E5 Misc Detergents B2 B3 A1 B2 A1 B2 A1 A1 Fuels / Oils Diesel - A2 C5 B2 A1 B2 A1 D5 Organic Chemicals Dimethyl Phthalate E5 - - - D5 - E5 - Fuels / Oils Engine Oil - A2 A2 B3 A1 D5 B2 B3 Alcohols Ethanol (Ethyl Alcohol) B4 C3 A1 B3 A1 B2 A- C4 Organic Chemicals Ethyl Acetate E5 A1 B2 E5 A1 E5 E5 E5 Organic Chemicals Ethylene Glycol (Antifreeze) A2 B3 A1 B3 A1 B3 A1 A1 Inorganic Chemicals Ferric Chloride A2 D5 A1 - A1 A1 A1 A1 Organic Chemicals Formaldehyde (Formalin) B4 B3 A1 D5 A1 B3 C5 A1 Acids - Organic Formic Acid (Methanoic Acid) C3 E5 A1 B3 A1 E5 C5 B5 Foodstuffs Fruit Juice A2 A1 A1 - A1 A1 A1 A1 Organic Chemicals Glycerol (Glycerin) A2 B4 A1 B3 A1 A1 A1 A1 Fuels / Oils Hydraulic Fluid - - - B- A1 B- A- - Acids - Inorganic Hydrochloric Acid, concentrated A2 E5 B4 A1 C4 B2 C5 E5 Acids - Inorganic Hydrochloric Acid, dilute B2 C5 B2 A1 B3 A1 B4 C5 Acids - Inorganic Hydrofluoric Acid E5 E5 E5 D5 E5 B2 E5 E5 Inorganic Chemicals Hydrogen Peroxide, Concentrated A2 E5 A5 B4 E5 B4 E5 B2 Inorganic Chemicals Hydrogen Peroxide, dilute A2 E5 A2 B4 E5 B3 D5 A1 Fuels / Oils Kerosene (Aviation Fuel) C4 A2 C4 C5 A1 A1 A- - Acids - Organic Lactic Acid C4 B3 A1 B3 A1 C5 B4 A1 Fuels / Oils Lubricating Oil - A2 A2 B2 A1 - B2 D5 Alcohols Methanol (Methyl Alcohol) C4 C4 A1 C4 A1 C4 A1 B3 Organic Chemicals Methyl Ethyl Ketone (MEK) E5 B3 B4 D5 D5 E5 E5 E5 Organic Chemicals Methylene Chloride E5 D5 D5 E5 D5 E5 E5 E5 Page 1 Crydom Magnetics Ltd

Crydom Float Switch Selector Chemicals Printed 24/06/2004 Classification Chemical PVC Nylon Polypropylene Polysulfone* PPS Viton Nitrile Silicone Fuels / Oils Mineral Oil / Fuel Oil B4 A2 A2 B3 A1 A2 A2 B3 Acids - Inorganic Nitric Acid, concentrated C5 E5 C5 E5 E5 D5 E5 E5 Acids - Inorganic Nitric Acid, dilute B5 E5 A1 C5 C4 C5 D5 D4 Organic Chemicals Nitrobenzene E5 D5 A1 - A1 A1 E5 E5 Organic Chemicals Nitromethane - A2 - - A1 - E5 - Foodstuffs Olive Oil A2 B2 A1 - - C4 A2 A2 Organic Chemicals Perchloroethylene - - - E5 A1 B3 D- - Fuels / Oils Petrol (Gasoline) B4 A2 C4 B3 A1 B2 A2 D5 Acids - Inorganic Phosphoric Acid, concentrated A2 E5 A1 B2 A1 B3 D5 C4 Acids - Inorganic Phosphoric Acid, dilute A2 E5 A1 A2 A1 B2 C4 B2 Inorganic Chemicals Potassium Chloride A2 B3 A1 - A1 A1 A1 A1 Inorganic Chemicals Potassium Cyanide A2 - A1 - A1 - A- - Inorganic Chemicals Potassium Nitrate A2 A2 A1 A1 A1 A1 A1 A1 Alcohols Propanol (IPA) - - A1 B3 A1 C5 B- D5 Inorganic Chemicals Silver Nitrate A2 A2 A2 - A1 A1 B2 A1 Misc Soaps A2 B3 A1 B2 A1 - A1 - Inorganic Chemicals Sodium Bicarbonate A2 B3 A1 - A1 A1 A1 A1 Inorganic Chemicals Sodium Chloride A2 B3 A1 - A1 A1 A1 A1 Inorganic Chemicals Sodium Cyanide A2 - A1 - A1 - A- - Alkalis Sodium Hydroxide, concentrated A2 E5 A1 B3 C4 D5 C4 C4 Alkalis Sodium Hydroxide, dilute A2 C5 A1 A1 A1 D5 B3 B3 Inorganic Chemicals Sodium Nitrate A2 B3 A1 - A1 A1 A1 A1 Acids - Inorganic Sulphuric Acid, concentrated E5 E5 D5 D4 D5 A2 E5 E5 Acids - Inorganic Sulphuric Acid, dilute B3 E5 A2 C3 A1 A2 D5 C5 Organic Chemicals Toluene E5 A2 D4 D5 A1 E5 E5 E5 Organic Chemicals Trichloroethylene E5 A3 D4 E5 - D5 D5 E5 Misc Turpentine - - D4 B3 A1 D5 A- E5 Misc Urine A2 B3 A1 - A1 A1 A- A1 Foodstuffs Vegetable Oil B2 A2 A1 - A1 B2 A2 A2 Misc Water A2 B3 A1 B2 A1 A2 A1 A1 Foodstuffs Whiskey - - A1 - - - A- - Foodstuffs Wine - - A1 - - - A- - Organic Chemicals Xylene E5 A2 D4 D5 A1 E5 E5 E5 Page 2 Crydom Magnetics Ltd