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Kitagawa Gas Detector Tube System

Gas Detectors

Typical Applications (See below Application)Kitagawa
  • Industrial Hygiene
    Gas detector tubes are successfully used for the quick measurement of harmful gases and vapours in the atmosphere and also the distribution of their concentration in the working area.

  • Fire/Explosion Prevention
    Available to prevent fire and explosion by detecting combustible gases leaked or generated in workplaces, and by foreseeing spontaneous combustion in coal mines.

  • Process Control
    In case gases are used as material or intermediates in various industries, impurities in the gas are measured by gas detector tubes in order to make products' quality up and production efficiency up by preventing deterioration of catalysts.

  • Air-pollution Source
    Flue gases such as Nitrogen compounds, SO2, CO, CO2, HCI and O2 are possible to measure economically together with Model P-10FG Flue gas sampler for air pollution control.

  • Industrial Waste Water
    Effluent can be analysed for certain types of pollution. The method is so simple and quick, accordingly instant checks can be made almost anywhere.


with Model AP-1 aspirating pump and standard accessories which are composed of a carrying case, 3 pcs. of rubber tube connector, 1 pce. of grease and an instruction manual.

Model APS

The principle of Kitagawa Gas Detector Tube System is a dry analysis method that makes an application of a chemical reaction and a physical absorption. In sampling a gas into a detector tube, a stained layer can be produced by means of the reaction of the reagent and gas in the tube. As the gas concentration is proportional to the length of stained layer, you can easily read off the concentration on the top of stained layer.

The reading methods of gas concentration are divided into two ways; a directly reading method of which reading can be obtained directly from the scale printed on the tube and a concentration chart method.


    The gas detector tube has many applications as stated below and many advantages which other analysis methods do not have.

  1. Measurements of working environment: The gas detector tube is used for measuring quickly concentrations of harmful gases and vapor in working environment and for grasping their concentration distributions in work sites. It is also used for the measurement of comparatively thick harmful gases or vapors in open tanks, painting rooms, plating tanks, electrolytic cells, storage sheds and gas leaking places, and the efficiencies of local exhaust system, overall ventilator and air purifier.

  2. Measurements for the environmental sanitation of buildings and offices: In the closed room, the concentrations of harmful gases as carbon monoxide and carbon dioxide are increased by respiration of human bodies. Measuring the efficiencies of the ventilation by using gas detector tube is effective for human bodies and working efficiencies.

  3. Measurements for the sanitation of schools and as teaching material: It is widely used as teaching material for health education, physical education and science.

  4. Measurements of pollutants in the atmosphere: In this case, it is necessary to measure much lower concentration than the allowable concentration for industrial hygiene. That is because allowable concentration for living environment should be considered to be 1/10 to 1/100 of that for industrial hygiene. Gas detector tubes can be also used for this purpose.

  5. Measurements of pollutants in flue gas: Measurement of pollutants in flue gas is important for the prevention of air pollution. The Japanese Industrial Standards(JIS) provides various kinds of test methods as analysis methods for flue gas, of which the simplest one is the gas detector tube method, all other methods being very complicated.

  6. Measurement of harmful gases is ships: It is used for the measurements of harmful gases in ships in conformity with the IMO rule.

  7. Process control: When gas is used as raw material in chemical and other industries, it happens that a very small quantity of impurity poisons the catalyst or gives bad effect on the quality of products. Therefore, it is necessary to measure and control this very small quantity of impurity. Furthermore, it is necessary to measure impure gas in products, mixing ratios of gas materials and composition of exhaust gas. The gas detector tube is used for testing the purity of gas in this kind of quality control.

  8. Mine safety: Pit fire or gas explosion caused by the spontaneous ignition of coals in the pit frequently occurs in mines. Such spontaneous ignition can be discovered at its early stage by detecting a very small quantity of carbon monoxide or of ethylene co-existing with the carbon monoxide by using detector tube. The detector tube is also used for the measurement of carbon monoxide after pit fire or explosion.

  9. Prevention of gas explosion: The concentration of inflammable gas in air or gas can be measured safely and quickly by the detector tube method. The measurement does not require any power source such as battery or heat source, so can be performed without any danger, providing no ignition source even in the presence of explosive mixed gas. For instance, tank explosion accident can be prevented by measuring acetylene generated in the carbide tank or tank lorry.

  10. Combustion inspection of gas apparatuses: Combustion condition of gas apparatuses after gas conversion can be inspected by detector tube for carbon monoxide.

  11. Measurement of alcohol in drunken person's breath: Breath alcohol detector tube is used by police stations of the metropolis and prefectures of Japan for the control of driving by drunken persons.

  12. Others: Detection of arsenic in foods: measurement of formaldehyde vapor generated from textile products; measurement of various kinds of ion.


Tube No. Detector Tube Tube No. Detector Tube Tube No. Detector Tube Tube No. Detector Tube
100 Carbon monoxide-length of stain 101SA Cetylene 102SA Acetone 102SC Acetone
102SD Acetone 103SA Sulphur dioxide 103SB Sulphur dioxide 103SC Sulphur dioxide
103SD Sulphur dioxide 103SE Sulphur dioxide 103SF Sulphur dioxide-in flue gas 104SA Ethyl alcohol
105SA Ammonia 105SB Ammonia 105SC Ammonia 105SD Ammonia
105SH Ammonia 105SM Ammonia 106B Carbon monoxide-in presence of ethylene, colour intensity 106C Carbon monoxide-in presence of ethylene and/ or nitrogen oxides, colour intensity
106S Carbon monoxide 106SA Carbon monoxide 106SB Carbon monoxide 106SH Carbon monoxide
106UH Carbon monoxide-ultra high range 107SA Diethyl ether 107U Diethyl ether 108B Ethylene-colour intensity
108SA ethylene-high range 109SA Chlorine 109SB Chlorine 109U Chlorine
110S Gasoline 111SA Ethyl acetate 111U Ethyl acetate 111U Isopropyl acetate
112SA Hydrogen cyanide 112SB Hydrogen cyanide 113SA n-Hexane 113SB n-Hexane
*113SC n-Hexane 114 Bromine 115S Cyclohexane 116 Chlorine dioxide
117SA Nitrogen dioxide 117SB Nitrogen dioxide 118SB Benzene-in presence of gasoline and other aromatic hydrocarbons 118SC Benzene
119SA Methyl alcohole 119U Methyl alcohol 120SA Hydrogen sulphide 120SB Hydrogen sulphide
120SC Hydrogen sulphide-in presence of sulphur dioxide 120SD Hydrogen sulphide *120SE Hydrogen sulphide 120SH Hydrogen sulphide
*120SM Hydrogen sulphide 120U Hydrogen sulphide 120UH Hydrogen sulphide-ultra high range *120UT Hydrogen sulphide
121SA Phosphine in acetylene 121SB Phosphine in acetylene 121SC Phosphine 121SD Phosphine
121U Phosphine 121U Arsine 122SA Ethylene oxide 122SB Ethylene oxide
122SC Ethylene oxide 123S Dimethyl ether 124SA Toluene 124SB Toluene
125SA Propane 126B Carbon dioxide 126SA Carbon dioxide 126SB Carbon dioxide
126SC Carbon dioxide 126SD Carbon dioxide 126SH Carbon dioxide-extra high range 126UH Carbon dioxide-ultra high range
128B Acrylonitrile 128SA Acrylonitrile 128SC Acrylonitrile *28SD Acrylonitrile
129 Nickel carbonyl 130U tert-Butyl mercaptan 130U Ethyl mercaptan *130U Isopropyl mercaptan
130U Methyl mercaptan 130U n-Propyl mercaptan 131 Inorganic gas qualitative detector tube 132SA Vinyl chloride
132SB Vinyl chloride 132SC Vinyl chloride 133A Acetaldehyde 133SB Acetaldehyde
134SA Trichloroethylene 134SB Trichloroethylene 135SA Tetrachloroethylene 135SB Tetrachloroethylene
136 Acrolein 137U Hydrogen 138SA Butyl acetate 138U Butyl acetate
139SA Methyl ethyl ketone 139SB Methyl ethyl ketone 139U Methyl ethyl ketone 140SA Arsine
141SA Carbon disulphide 141SB Carbon disulphide 142S Mercury vapour 143SA Xylene
143SB Xylene 145S 1,2-Dichloroethylene 146S Phosgene 147S Carbon tetrachloride
148 Methyl acetate 149SA Isopropyl acetate 150SA Isopropyl alcohol 150U Isopropyl alcohol
151SA Propyl acetate 151U Propyl acetate 152S Chloroform 153SA Isobutyl acetate
153U Isobutyl acetate 154SA 1,4-Dioxane 154U 1,4-Dioxane 155SA Methyl isobutyl ketone
*155U Methyl isobutyl ketone 156S Hydrogen fluoride 157SA Methtyl bromide 157SB Methtyl bromide
*157SC Methtyl bromide 158S Styrene 159SA Oxygen 159SB Oxygen
*159SC Oxygen-Non-heating type 160S Methyl chloroform 161S Furan 162SA Tetrahydrofuran
162U Tetrahydrofuran 163SA Propylene oxide 164SA Methtl mercaptan 164SH Methtl mercaptan
165SA Ethyl mercaptan 166S Ethylene dibromide 167S Hydrogen selenide 168SA 1,3-Butadiene
168SB 1,3-Butadiene 168SC 1,3-Butadiene 169S Chloroprene 170S Pentane
170S Isobutane 170S Heptane *171SA Formaldehyde 171SB Formaldehyde
172 Chloropicrin 173SA Hydrogen chloride 173SB Hydrogen chloride 174A Nitro-oxide compound
174B Nitro-oxide compound-in flue gas 175SA Nitrogen oxides *175SH Nitrogen oxides 175U Nitrogen oxides
176S Methyl iodide 177SA Water vapour 177U Water vapour 178S Chlorobenzene
179S Ethyl benzene 180S Dichloromethane 181S Aniline *182SA Ozone
*182SB Ozone 182U Ozone 183U Cresol 183U Phenol
184S Allyl alcohol 184S Methyl methacrylat 185S Propylene 186 Organic gas checker
186B Organic gas qualitative detector tube 187S General hygrocarbons 188U Isoamyl acetate 189U 2-Butanol
190U Butyl cellosolve 190U Ethyl cellosolve 190U Methyl cellosolve 191U Ethyl cellosolve acetate
192S Epichlorohydrine 193S Methyl styrene 194S 1,3-Dichloropropane 195U Diacetone alcohol
196S N,N-Dimethyl formamide 197U Cyclohexanone 198U Methyl cyclohexanone 199U Methyl cyclohexanol
200SA Sulphide ion 200SA Sulphide ion 201SA Chloride ion 201SB Chloride ion
202 Iron ion 203S Copper ion 204S Cyanide ion 205SL Salinity
206U Cyclohexanol 207U 1-Butanol 208U Isobutyl alcohol 209U Isobutyl alcohol
210U Pentyl acetate 211U Methyl acetate 211U Butyl acrylate 212U Ethyl acrylate
213S Triethyl amine 214S 0-Dichlorobenzene 215S p-Dichlorobenzene 216S Acetic acid
217U Furfural 218U Mesityl oxide 219S Hydrazine 220S Formic acid
221SA n-Butane 222S Diethyl amine 222S Trimethyl amine 223S 2,2,-Dichloroethyl ehter
224SA Monoethanol amine 225U Isobutyl acrylate 226U Naphthalene 227S Methyl amine
227S Dimethyl amine 227S Ethyl amine 228U 1,2,4-Trimethyl benzene *229S N,N-Dimethylacetamide
230S 1,2,-Dichloroethane *232SA Ethylene glycol 232SB Ethylene glycol 233S Nitric acid vapour
234SA Free residual chlorine 235S 1,1-Dichloroethane 236S 1,1,2-Trichloroethane 237S Vinyl acetate
*238S Furfuryl alcohol *239S Carbonyl sulphide *240S Silane *241U Isoprene
*242S Diborane *243U Tetraethoxysilane 300 Air flow indicator tube 500 TWA-Carbon monoxide
501 TWA-Ammonia 502 TWA-Hydrogen sulphide 503 TWA-Sulphur dioxide 504 TWA-Toluene
600SP Compressed breathing air test tube (CO) 601SP Compressed breathing air test tube (CO2) 602SP Compressed breathing air test tube (Oil mist) 603SP Compressed breathing air test tube (H2O)
604SP Compressed breathing air test tube (O2) 800B Charcoal tube 801 Silica-gel tube * marked items are New Detector Tubes.