12
11.2.4 Gas hoses
NOTICE
Two connections are available for
the gas intake.
1. Insert the first hose into the gas source and at the gas inlet
(IN) (Fig. 3, (13)).
2. Insert the second hose into the gas outlet (OUT) (Fig. 4, (21
or 22)) and connect it to the vessel lid (Fig. 5, (26)).
When using two gases you can use the supplied Y-connec-
tor.
11.2.6 Temperature sensor
1. Push the temperature sensor through the grommet on the
vessel lid (Fig. 5, (26)).
2. Tighten the nut.
3. Connect the cable to the controller (Fig. 4, (24))
.
11.2.5 Flow meter
NOTICE
The maximum (inlet) pressure must
not be exceeded (see chapter
“18
Technical data”).
Check the mobility of the measu-
ring tube float before operating.
Due to condensation, e. g. by tem-
perature changes during shipping,
the float might get stuck in the
tube. In this case flush the flow
meter with dry and clean gas.
The flow of gas 1 & 2 (Fig. 2, (12)) can be regulated using the needle
valves (Fig. 2, (11)):
•
Clockwise: Flow closed
•
Counterclockwise: Flow open
The flow rate (ml/min) can be determined with the values on the
measuring scale (middle of the float) and the tables for CO
2
flow
measurement and air flow measurement.
Note:
The calculations are based on following conditions.
Ambient
Temperature:
21.1 °C (70 °F)
Barometric pressure: 1013.5 mbar (14.7 psi)
Gas
Temperature:
21.1 °C (70 °F)
Operating pressure: 1013.5 mbar (14.7 psi)
Accuracy:
2 %
CO
2
flow measurement
Scale reading
(mm)
Flow
(ml/min)
65
310
60
284
55
256
50
229
45
204
40
177
35
149
30
122
25
100
20
82.0
15
64.0
10
48.0
5
34.0
Air flow measurement
Scale reading
(mm)
Flow
(ml/min)
65
299
60
267
55
238
50
207
45
181
40
160
35
138
30
118
25
97.4
20
80.5
15
63.2
10
48.4
5
36.2
