New Cosmos Electric KD-12B, Инструкция по эксплуатации

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With no calibration gas cylinder

Use the Gas Calibration Kit (optional item) and a pure gas cylinder of isobutane at 99
vol% or more, and dilute the isobutane with air to produce 0.72 vol% (40%LEL)
calibration gas.
Memo The calibration gas can be used to check the alarm function. Check the
concentration using Gas Detector XP-3110 or a similar device before using the gas
for calibration.
DANGER
●
Make sure that there are no flammables nearby when
handling flammable gas with a concentration over LEL (lower
explosive limit).
(1) Drawing raw gas
Connect a gas bag to an isobutane 99vol% cylinder and
draw a little more than you actually need.
Bend back the hose and pinch with a pinch cock so the gas
does not leak from the bag.
(2) Drawing a fixed amount of raw gas
Connect a 10ml syringe to a gas bag and draw 7.2ml of raw
gas. (Draw a little more than you actually need then
discharge the excess.)
(3) Transferring raw gas into a quantitative pump
Connect a syringe to the inlet of a quantitative pump then
pull out the pump’s piston. Raw gas in the syringe is sucked
into the pump. Remove the syringe and pull the piston all
the way out (100ml).
(4) Making diluted gas
Connect an empty gasbag to the outlet of the quantitative
pump then push in the pump’s piston.
Move the piston back and forth 9 times to add air in order to
make diluted gas.
Memo
If you take 7.2ml of raw gas and move the quantitative
pump’s piston back and forth 10 times (a back-and-force
motion: 100ml),
7.2ml/(100ml×10)=0.0072
0.72vol% diluted gas is made.
Isobutane’s lower explosive limit (LEL) is 1.8vol%.
0.72/1.8×100=40.0
40%LEL diluted gas is made.
p u re g a s c y lin d e r
(K e e p it u p rig h t.)
g a s b a g w ith ra w
g a s
7 .2 m l o f ra w
p u ll
v in y l tu b e
s y rin g e
s y rin g e
q u a n tita tiv e
p u m p
q u a n tita tiv e
p u m p
a ir
g a s b a g w ith
d ilu te d g a s
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