Gastec รหัสสินค้าNo.138หลอดวัดความเข้มข้นของแก๊ส,Gas Detector Tube for Ethyl chloride,Meas.range:15～150 ppm,Quantity:10pcs/Box

Methylene Chloride Detection Tubes (20 to 500 ppm) Gastec Detection Tube No. 138 measures Methylene Chloride with a Range of 20 to 500 ppm.

• Measuring Range: 20 to 50 ppm, 50 to 500 ppm
• Number of Pump Strokes: 2, 1
• Correction Factor: 0.4, 1
• Sampling Time: 3 minutes per pump stroke
• Detecting Limit: 10 ppm (2 pump strokes)
• Corrections for temperature & humidity: Temperature Correction is necessary
• Reaction Principle:
  • CH2Cl2 + CrO3 + H2S2O7 → Cl2
  • Cl2 + 3,3',5,5'-Tetramethylbenzidine → Pale pink product
• Relative Standard Deviation: 15% (for 50 to 100 ppm), 10% (for 100 to 500 ppm)
• Changes from White to Pale Pink
• 3 Year Shelf Life
• Store the tubes at cool and dark place.
• Comes in a Box of 5 pre tubes and 5 detector tubes

• On-site measurements can be performed easily by anybody, anytime and anywhere, in a short time
• Easy-to-check direct reading possible due to calibrated scale directly printed on the tube
• An extensive measuring range can be obtained by adjusting the sampling volume
• In order to assure high precision, each production lot is tested and calibrated independently, Each detector tube has its own quality control number printed on the tube
• Long shelf-life with excellent long-term stability