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Selection of appropriate leak detectors based on the stored/transported liquid.

searchs_enThe following features of the stored liquid have to be observed for the selection of a suitable leak detector:

  • Classification in water hazard classes (in Germany WGK I, WGK II and WGK III).
  • Flash point of the liquid, if the flashpoint is < 55°C, the temperature class and the explosion group have to be considered, too.
  • Density of the stored liquid, since these determine the selection of container as well as the required alarm set point of the leak detector.


Consider following notes for the selection of a vacuum leak detector:

  • The viscosity of the stored liquid may not exceed 5,000 mm²/s, otherwise the function of the vacuum leak detector can not be guaranteed.
  • The leak detector and the connecting pipes/tubes have to be resistant against the stored/transported liquid.
  • The suitability of vacuum leak detectors to the storage/transported liquid can be checked within the approved list of substances of the respective leak detector. If for special applications there is no leak detector listed for the stored/transported liquid, so please contact the manufacturer for further information. In some cases, a leak detector in stainless steel version (material 1.45.71) has to be applied with the resistance to the DIN6601, table 2.


Consider following notes for the selection of a pressure leak detector:

  • In case of a leak inside the container/tank or pipe, the possible reaction behavior of the monitoring medium (ambient air) have to be observed. If necessary, a leak detector with the monitoring medium nitrogen is used.
  • For flammable liquids with flash point < 55°C, all required safety and explosion guidelines have to be observed.


Overview of storage media

For further product information please click on the color-coded field in the line of the desired storage medium.

Key storage media: * = With material groups each single medium has to be checked

Key leak detector:    = primary,    = Also suitable

Key of the "Remarks" column: GL = saturated solution, TR = technically pure, S = sulfur free, H = operational requirements.


This table is very wide! Just swipe left and right to see all available information.

  Leak Detector  
Storage Medium Pressure Leak Detector Type IV F Type III F Type V8 Type V13 Type V33 V80 Brass V80 Stainless Steel V90 Brass V90 Stainless Steel Remarks
2-Butanol           Explosion group IIA
2-Propanol           Explosion group IIA
Acidic sterin aethylester                  
Alcohol*           Explosion group IIA
Aliphatic hydrocarbons*           Explosion group IIA
Aluminum chloride                 < GL
Ammonia solutions, 0.88 < density <= 0.957
at 15°C in water <= 35%
Ammonium chloride                 < GL
Ammonium nitrate, (in stabilized form)                 < GL
Ammonium phosphate                 < GL
Ammonium sulfate                 < GL
Animal fats and oils (whale oil)                  
Aromatic hydrocarbons*           Explosion group IIA
Avgas 80           Explosion group IIA
Avgas 100           Explosion group IIA
Avgas 100LL           Explosion group IIA
Avgas 115           Explosion group IIA
Avgas Grad 80           Explosion group IIA
Avgas Grad 100           Explosion group IIA
Avgas Grad 100LL           Explosion group IIA
Avgas Grad 115           Explosion group IIA
Aviation fuel*           Explosion group IIA
Aviation turbine fuel*           Explosion group IIA
Aviation turbine fuel, kerosine type Jet-A           Explosion group IIA
Aviation turbine fuel, wide out type Jet-B           Explosion group IIA
Avtag           Explosion group IIA
Avtur           Explosion group IIA
Barium nitrate                 < GL
Barium sulfate                 < GL
Benzene           Explosion group IIA
Boiling point spirits according to DIN 51631           Explosion group IIA
Boric acid < GL
Boron oils    
Brake fluid, hydraulic
with flash point >100ºC
Brine                 < GL
Butanol           Explosion group IIB
Calcium carbonate                 S
Calcium chloride                 < GL
Calcium hydroxide                 < GL
Calcium nitrate                 < GL
Castor oil TR
Caustic soda 3%                  
Citric acid                 < GL
Coal tar distillate with
FP >100°C, BP >100°C
Coal tar naphtha, with
FP >100°C, BP >100°C
Coconut oil                  
Copper (I) chloride                 < GL
Copper (I) sulfate                 < GL
Copper (II) chloride                 < GL
Copper (II) nitrate                 < GL
Copper (II) sulfate                 < GL
Cottonseed oil                 TR
DERD 2453           Explosion group IIA
DERD 2454/4           Explosion group IIA
DERD 2485/8           Explosion group IIA
Detergent P 3                  
Diesel fuel in accordance with DIN 51601    
Diethylene glycol   TR
Dish washing substance concentrated                  
Distilled water                  
Drilling oils  
Ethyl glycol, ethyl glycol monoethyl ether    
Ethylene glycol, glycol TR
F18           Explosion group IIA
F22           Explosion group IIA
F34           Explosion group IIA
F35           Explosion group IIA
F40           Explosion group IIA
FAM normal petrol according to DIN 51635           Explosion group IIA
Formaldehyde, aq.solution, with 37 %
formaldehyde, 10-15 % methanol content
Formaldehyde, aq.solution, with
formaldehyde < 5%, FP > 100ºC
Formaldehyde, aq.solution, with
formaldehyde >=5%, methanol < 15%,
21< = FP < = 55ºC
Formaldehyde, aq.solution, with 37 %
formaldehyde >=5%, methanol < 15%,
FP >=55ºC
Formalin, formaldehyde   < GL
Fresh oils SAE 40                  
Fresh oils SAE 80                  
Fuel oil, heating oil    
Gas oil, with FP >100ºC, BP >200ºC  
Gasoline           Explosion group IIA
Gasoline 80           Explosion group IIA
Gasoline 100           Explosion group IIA
Gasoline 100 LL           Explosion group IIA
Gasoline 115 / 145           Explosion group IIA
Glycerine, propane-triol TR
Henko (detergent) 2%, in water
at 70°C
Heptane           Explosion group IIA
Hexane           Explosion group IIA
Hydraulic oils    
Hydrazine, aqueous solution
containing 15% hydrazine
Hydrogen chloride (hydrochloric acid)                 < GL
Iron (II) chloride                 < GL
Iron (II) sulfate                 < GL
Iron (III) chloride                 < GL
Iron (III) sulfate                 < GL
Iron (III)-sulfate-chloride mixture
of code no. 414/415
                < GL
Iso-Decane           Explosion group IIA
JP 1           Explosion group IIA
JP 4           Explosion group IIA
JP 8           Explosion group IIA
Lactic acid < 80%                  
Linseed oil                  
Linseed oil fatty acid                  
Liquid fertilizer                  
Liquid fertilizer (Enpesol)                 H
Lubricating oils (base oils, emulsifiable)                 < GL
Lubricating oils (base oils, non-doped) < GL
Lubricating oils (doped, non-emulsifiable) < GL
Lubricating oils (emulsifiable)                 < GL
Magnesium chloride                 < GL
Magnesium nitrate < GL
Magnesium sulphate < GL
Mercury (II) chloride                 < GL
Methanol           Explosion group IIA
Methyl ester (biodiesel) E DIN 51606
(Adaptation required for leak detector
components in contact with medium)
Methylene glycol    
Methylester (biodiesel) DIN EN 14214
formerly DIN 51606
MIL-G-5572 F           Explosion group IIA
MIL-T-5624 L           Explosion group IIA
MIL-T-83133           Explosion group IIA
Naphtha in accordance with DIN 51634           Explosion group IIA
n-Decane           Explosion group IIA
Nickel (II) chloride                 < GL
Nickel (II) nitrate                 < GL
Nickel sulphate                 < GL
Nitric acid, < 40% pure acid                  
Nonane           Explosion group IIA
Octane           Explosion group IIA
Oleic acid                 TR
Olive oil                 TR
Oxalic 10% acid in water                  
P 3 solution < 10%                  
Palm oil                  
Palmitic acid, fatty acid (hexadecanoic acid)   TR
Paraffin oil                 < GL
Paraffin, lamp and solvent kerosene
in accordance with DIN 51636
          Explosion group IIA
Peanut fatty                  
Peanut oil                  
Petrol (95 and 91 octane)
in accordance with DIN 51600
          Explosion group IIA
Petroleum ether according to DIN 51630           Explosion group IIA
Petroleum products with flash point > 55°C*    
Phosphate acid < 80%                  
Poppy seed oil                  
Potassium brombide                 < GL
Potassium carbonate lysis 52.8%                  
Potassium chlorate                 < GL
Potassium chloride < GL
Potassium cyanide                 < GL
Potassium iodide < GL
Potassium nitrate < GL
Potassium phosphate                 < GL
Potassium sulphate < GL
Propanol           Explosion group IIB
Propionic acid < 50% pure acid                  
Shale oil with FP >100°C, BP >100°C  
Sodium acetate < GL
Sodium aluminate e.g. Alton P-1                  
Sodium brombide                 < GL
Sodium chlorate                 < GL
Sodium chloride < GL
Sodium chlorite, aq. solution
with > 5% active chlorine
Sodium cyanide, aqueous solution,
with max. Density 1.2 kg / l
Sodium fluoride < GL
Sodium hydrogen carbonate < GL
Sodium nitrate < GL
Sodium perborate                 < GL
Sodium phosphate                 < GL
Sodium sulphate < GL
Sodium sulphite < GL
Sodium thiosulphate < GL
Sodiumhydrogensulfate                 < GL
Sodiumhydrogensulfite                 < GL
Soft soap                  
Soybean oil                  
Special petrol Hydrocarbons*           Explosion group IIA
Spindel oil  
Stearic acid, fatty acids (octadecanoic) acid   TR
Strength (pH 5-8)                 < GL
Sulfuric acid, <90% pure acid                  
Sunflower oil                  
Tall oil                  
Tars, liquid with FP > 100°C  
Tartaric acid, dihydroxy butanoic acid < GL
Tin (II) chloride                 < GL
Toluene           Explosion group IIA
Turpentine oil substitute,
with FP >100°C, BP >100°C
Unleaded petrol in accordance
with DIN 51607
          Explosion group IIA
Urea (dissolved), ammoniacal < GL
Urea-formaldehyde solutions (e.g. glue)   < GL
VTL-9130-004/2c           Explosion group IIA
VTL-9130-006/4           Explosion group IIA
Wheat germ oil                 TR
White spirit in accordance
with DIN 51632
          Explosion group IIA
Xylene           Explosion group IIA
Zinc chloride, aqueous solution of 78.6%                  
Zinc nitrate                 < GL
Zinc sulfate                 < GL


If an appropriate leak detector for your storage/transported liquid cannot be determined, please contact the manufacturer. If necessary, a leak detector in stainless steel has to be applied. In this case the resistance has to be verified according to DIN6601 (Positive list), Table 2, material 1.4571.