Gastec 131TP Instructions

Instructions for
No.131TP
Vinyl Chloride Detector Tube

FOR SAFE OPERATION :

Carefully read this manual and the instruction manual of your Gastec Gas Sampling Pump.
⚠
CAUTION : If you do not observe the following precautions, you may
suffer injuries or damage the product.
1. When breaking the tube ends, keep away from eyes.
2. Do not touch the broken glass tubes, broken pieces and reagent with bare hand(s).
△
NOTES : For maintaining performance and reliability of the test
results, observe the following.
1. Recommend to use Gastec Gas Sampling device Model GSP-300FT-2 (if not available use
the air sampler of equivalent to sample for 100 mL/min) together with Gastec Detector Tubes
only for the purposes specified in the instruction manual of the detector tube.
2. Use this tube within the temperature range of 0 - 40 ℃ (32 - 104 ℉ ).
3. Use this tube within the relative humidity range of 0 - 90%.
4. This tube may be interfered with by the coexisting gases. Please refer to the table
"INTERFERENCES" below.
5. The shelf life and storage condition of the tube are marked on the label of the tube box.

APPLICATION OF THE TUBE :

Use this tube for detecting Vinyl Chloride in the air or in industrial areas and for determining
the environmental atmospheric condition.

SPECIFICATION :

(Because of Gastec's commitment to continued improvement, specifications are subject to
change without notice.)
Oxidising Agent
Measuring Range
Sampling Rate
Correction Factor
Sampling Time
Detecting Limit
Colour Change
Reaction Principle
Coefficient of Variation : 10% (for 0.2 to 1.0 ppm), 5% (for 1.0 to 3.0 ppm)
**Shelf Life : Please refer to the validity date printed on the tube box.
**Store the tubes in a dark and cool place.
Detecting Layer
0.2 – 3.0 ppm 3.0 – 9.6 ppm
100 mL/min 50 mL/min
1 3.2
10 minutes
0.08 ppm
Yellow → Reddish purple
: CHCl ＋ I ＋ H → HCl, Cl
CH O SO
2 2 5 2 4
＋ Base → Chloride
HCl, CI
2

CORRECTION FOR TEMPERATURE, HUMIDITY AND PRESSURE :

Temperature : Correct for temperature with the table below.
Temperature ℃ ( ℉ )
Correction Factor
Humidity : No correction is required for 0 - 90%R.H.
Pressure : To correct for pressure, use the formula below :

MEASUREMENT PROCEDURE :

If automatic air sampler Model GSP-300FT-2 is used
1. Prior to operation please confirm if black colour inlet rubber tube holder is equipped with the
sampler.
2. Break both end of the tips of the detector tube by the tube tip holder supplied. Connect the
detector tube to the pump with arrow (
3. Set the flow meter at 100 mL/min and timer to "10 minutes" of the sampler. Press the start
switch of the sampler to start the sampling.
4. After the sampling, remove the detector tube from the sampler.
5. Read the concentration level at the interface where the stained reagent meets the unstained
reagent.
6. For measurements higher than 3.0 ppm, prepare a fresh tube and set the flow meter at 50
mL/min and timer to "10 minutes" of the sampler. Press the start switch of the sampler to
start the sampling.
7. If necessary, multiply the readings by the correction factors of temperature and atmospheric
pressure.

INTERFERENCES :

Substance
Hydrogen Chloride
Chlorine
Ethylene
1,2-Dichloroethane
Tetrachloroethylene
Trichloroethylene
Toluene
2
Benzen
This table of interference gases primarily expresses the interference of each coexisting gas in
the concentration range, that is equivalent to the gas concentration. Therefore, the test result
may show positive results due to other substances not listed in the table. If more information
is needed, please contact us or our distributors in your territory.
0 5 10 15
(32) (41) (50) (59)
3.00 2.15 1.60 1.20
Tube Reading (ppm) × 1013 (hPa)
Atmospheric Pressure (hPa)
) on the tube pointing toward pump.
Concentration Interference
≧0.2 ppm
0.04 ppm
≧55 ppm
≦10 ppm
≦50 ppm
0.04 ppm
≧1.0 ppm
≧0.8 ppm
20 25 30 35 40
(68) (77) (86) (95) (104)
1.00 0.90 0.80 0.70 0.60
Interference gas only
+
Reddish purple at 0.2 ppm
+
Reddish purple
-
No discolouration
No
No discolouration
No
Reddish purple at 500 ppm
+
Reddish purple
-
No discolouration
-
No discolouration