Gastec 13 Instructions

Instructions for
GASTEC
No.13 Carbon Disulphide Detector Tube
FOR SAFE OPERATION :
Read this manual and the instruction manual of your Gastec Gas Sampling Pump carefully.
& WARNING:
1. Use only Gastec detector tubes in a Gastec Pump.
2. Do not interchange or use non-Gastec parts or components in Gastec's detector tube and
pump system.
3. The use of non-Gastec parts or components in Gastec's detector tube and pump system or
use of a non-Gastec deteclor tube w ith a Gastec pump or use of a Gastec detector tube with
a non-Gastec pump may result in property damage, serious bodily injury, and death; voids all
warranties; and voids all performance and data accuracy guaranties
Lt. CAUTION : If not observed, injuries to the operator or damage to the
product may result.
1. When breaking the tube ends, keep away from eyes.
2. Do not touch the broken glass tubes, pieces and reagent with bare hand(s).
.6.NOTES : For maintaining performance and reliability of the test
results.
1. Use Gastec Gas Sampling Pump 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°C(32 -104°F).
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
' INTERFERENES".
5. Shelf life and storage condition of the tube are marked on the label of the box of tube.
APPLICATION OF THE TUBE :
Use this tube for the detection of Carbon Disulphide in air or the industrial areas and
environmental atmospheric condition.
SPECIFICATION :
(As a resull of Gastec's commitment to continued improvement, specifications are subject to
change without notice.)
<
G►
C ____
jiLa-ye_r __
~"q~
◄© G►l
10
~~~~I~ ~,~
Detecting Layer
I
>
The Minimum Scale (2.5ppm) is not printed on the tube and is indicated as a Scale Line only.
Measurina Ranae 0.63 - 1.25 oom 1.25 - 2.5 oom
f2.5l -50 oom
50-100 ppm
Number of Pump Strokes 4 2
1 1 /2
Correction Factor 0.25 0.5
1 2.0
Samolina Time 3 minutes oer oumo stroke
1.5 minutes
Detectina Limit 0.3 oom ( n
=
4 l
Colour Chanoe Blue - Yellow
Carbon disulphide is oxidized by nascent oxygen, which is
generated by the reaction of chromic acid and sulphuric acid to
sulphur dioxide. Sulphur dioxide neutralizes barium chloride,
Reaction Principle discolouring pH indicator to yellow.
CS2
+
Cr03
+
H2S2O1 - SO:!
+
CO:!
S◊.!
+
BaCl2
+
H iO - BaS03
+
2HCI
HCI
+
Base - Chloride
Coefficient of Variation: 10% (for 2.5 to 10 ppm), 5% ( for 10 to 50 ppm)
**Shelf Life : Please refer to the Validity Date printed on the box of tube.
**Store the tubes under dark and cool place .
CORRECTION FOR TEMPERATURE, HUMIDITY AND PRESSURE:
Calibration of the Gastec detector Tube No.13 is based on a tube temperature of 20°c (68° F)
and not the temperature of the gas being sampled, approximately 50% relative humidity and
normal atmospheric pressure.
Temperature : Correct for temperature by the table below.
Humidity : No correction is required between O - 90% R.H.
Pressure :
To correct for pressure, use the formula below
Tube Reading* (ppm)
x
1013 (hPa)
Atmospheric Pressure (hPa)
*
This value is after other correction(s), if any, are applied.
MEASUREMENT PROCEDURE :
1. For leak checking of the pump insert a fresh sealed detector tube into pump. Follow
instructions provided with the pump operation manual.
2. Break tips off a fresh primary tube and secondary tube by bending each tube end in the tube
tip breaker of the pump.
3. Connect © marked ends with rubber tubing after breaking each end.
4. Insert secondary tube securely into pump inlet with arrow (
G► )
on the tube pointing toward
pump.
5. Make certain pump handle is all the way in. Align guide marks on pump body and handle.
6. Pull handle all the way out until it locks on
1
pump stroke (100ml). Wait 3 minutes and confirm
the completion of the sampling.
7. For lower than 2.5 ppm measurement, repeat the above sampling procedure 1 or 3 more
times until the stain attains to the first calibration mark. For higher than 50 ppm measurement,
prepare fresh tube and take 1/2 pump stroke.