Gastec รหัสสินค้า No.91M หลอดวัดความเข้มข้นของแก๊ส,Detector Tube for Formaldehyde,Meas.range:8～6,400ppm,Quantity:10pcs/Box

Formaldehyde Detection Tubes (8 to 6400 ppm)Gastec Detection Tube No. 91M measures Formaldehyde with a Range of 8 to 6400 ppm.

• Measuring Range:
  • 8 to 20 ppm
  • 20 to 2000 ppm
  • 2000 to 6400
• Pump Strokes: 2, 1, 1/2
• Correction Factor: 0.4, 1, 3.2
• Sampling time: 1 minute per pump stroke
• Detecting Limit: 4 ppm (2 pump strokes)
• Changes from Yellow to Red
• Corrections for temperature & humidity: Temperature correction is necessary
• Reaction Principle:
  • 3HCHO + (NH2OH)3H3PO4 → H3PO4
  • H3PO4 + Base → Phosphate
• Relative Standard Deviation: 10% (for 20 to 500 ppm), 5% (for 500 to 2000 ppm)
• 2 Year Shelf Life (in the refrigerator)
• Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below.

• 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