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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 oilTR
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, glycolTR
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-triolTR
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.