Flowmeter 303 Operating Instructions 3701 PDF Document

Flowmeter 303 Operating Instructions 3701 PDF Document
Operating Instructions
863 Valley View Road, Eighty Four PA 15330 USA
Tel: 724-941-9701 Fax: 724-941-1369 www.skcinc.com
Flowmeter
Catalog No. 303
SKC primary standard flowmeters are designed, manufactured, and tested for accuracy; no calibration
is needed. Read the operating instructions thoroughly before operating the flowmeter.
Principle of Operation
The air sampling pump to be calibrated is connected to and pulls air through the flowmeter’s
volumetric glass tube where a flat soap bubble (film) is interposed into the flow path. As the
airflow causes the film to move up the volume marks, travel time is measured using a stopwatch. Flow rate can be calculated using the travel time and known tube volume.
Assembly
SKC Model 303 is shipped ready to use. Film solution is supplied as well as a length of rubber
tubing to connect the flowmeter to the pump.
Preparing for Operation
1. Remove the flowmeter from the case, and place it upright on a level surface.
2. Remove the large rubber stopper from the top of the flowmeter.
3. Tip the flowmeter at an angle, and pour a small amount of film solution into the top of
the glass tube. The liquid should run down into the rubber bulb at the bottom.
4. Continue adding film solution until it completely fills the bulb and rises to just below
the side arm inlet. Squeeze the rubber bulb occasionally to release trapped air.
5. Replace the stopper on top of the flowmeter.
Wetting the Walls of the Tube
The interior walls of the flowmeter must be wet for the film to travel without rupture. There
are two methods:
Method 1
1. Tip the flowmeter to a horizontal position. Allow the film solution to run out of the rubber bulb and into the tube.
2. Maintaining the horizontal position, rotate the flowmeter so that film solution coats the
entire inside surface of the glass. Caution: Do not allow the solution to enter the metal
tube in the rubber stopper at the top of the flowmeter.
3. Return the flowmeter to an upright position and allow the liquid to flow back down
into the rubber bulb. Squeeze the bulb occasionally to release trapped air.
Method 2
1. Connect a pump to the flowmeter (see Connecting a Pump).
2. Turn on the pump. Each successive film that rises up the tube will wet the glass. The
walls are sufficiently wet when the film bubbles successfully reach the highest volume
mark on the flowmeter.
Connecting the Pump
Note: If the pump to be calibrated draws air, connect it to the rubber tubing on the flowmeter’s
top rubber stopper. If the pump blows air, use rubber tubing to connect it to the lower side
arm near the base of the flowmeter.
1. Remove the rubber cap from the side arm inlet near the base of the flowmeter.
2. Using rubber tubing, connect one end to the appropriate port on the flowmeter and the
other end to the inlet of the sampling medium to be used (if applicable).
3. Using flexible tubing, connect the outlet of the sampling medium to the inlet of the
pump.
Sample
Media
Outlet
Rubber
Tubing
Calibration
Chamber
Inlet
Sample
Pump
Outlet
(upper
port)
Tygon
Tubing
Flowmeter
Pump
Inlet
Inlet (lower
side arm port)
Measuring the Flow
1. Turn on the pump.
2. Squeeze the rubber bulb on the flowmeter to force the liquid above the inlet. Bubbles
(film) will form.
3. Using a stopwatch, start timing the film as it passes the zero line and stop timing as the
bubble reaches the 100 ml line. For best results, form several bubbles, five to six seconds
apart, and time the last bubble.
Caution: Do not squeeze the bulb continuously. This causes froth to form on the walls making timing difficult.
The flow rate can be determined from the Flow Chart on the back page, or calculated using
the following equation:
Flow (ml/min) = 60 x (volume traveled)
Time (in seconds)
Storage or Transport
Disconnect the pump and replace the rubber cap on the lower inlet of the flowmeter. The
instrument can be placed in any position without solution loss. SKC recommends that it be
transported in its case.
Volumetric Calibration of Hand Pumps
SKC Model 303 Flowmeter can be used to determine the volume of manual hand pumps such
as the bellows or piston pumps used with detector tubes. Follow these procedures:
Bellows Pumps (i.e., Dräger®)
1. Connect a detector tube to the pump according to the manufacturer’s instructions.
2. Connect the inlet of the tube to the rubber hose on top of the flowmeter.
3. Compress the bellows pump and release slowly. Squeeze the rubber bulb on the flowmeter. Bubbles (film) will begin to form.
4. When the film reaches the zero line on the flowmeter, compress the bellows pump completely and release. The film will move up the flowmeter and stop when the bellows
pump is filled to capacity.
5. Record the point at which the film stops. Most bellows pumps are designed to draw
100 ml. Lines on the flowmeter are graduated at 90, 95, 100, 105, and 110 ml. Visually
extrapolate the volume reading if the film stops between lines.
6. Calculate and record the volume.
Note: Pumps should be repaired if they fall outside of the 90 to 110 ml range.
Piston Pumps (i.e., Gastec®, MSA, Kitagawa)
1. Connect a standard detector tube to the piston pump according to the manufacturer’s
instructions.
2. Connect the inlet of the tube to the rubber hose on top of the film flowmeter.
3. While pulling the piston slowly back, squeeze the rubber bulb on the flowmeter until
bubbles (film) form.
4. Watch the film movement closely. When the film is exactly at the zero line on the flowmeter, push the pump piston all the way in. Then, draw the piston out to full capacity
and lock it in place. The film will move up the flowmeter and stop when the piston
pump is filled to capacity.
5. Record the point at which the film stops. Most piston pumps are designed to draw
100 ml. Lines on the flowmeter are graduated at 90, 95, 100, 105, and 110 ml. Visually
extrapolate the volume reading if the film stops between lines.
6. Calculate and record the volume.
Note: Pumps should be repaired if they fall outside the 90 to 110 ml range.
Notice: This operating instruction may not address all safety concerns (if any) associated with
this product and its use. The user is responsible for determining and following the appropriate
safety and health practices and regulatory limitations (if any) before using the product. The
information contained in this document should not be construed as legal advice, opinion, or
as a final authority on legal or regulatory procedures.
Flow Chart for 303 Calibrator
100 ml line Time Flow (sec) (ml/min) Using 100 ml line 12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42 500
462
429
400
375
353
333
316
300
286
273
261
250
240
231
222
214
207
200
193
187
182
176
171
167
162
158
154
150
146
143
100 ml line `
Time Flow (sec) (ml/min) 43
44
45
46
47
48
49
50
51
52
53
55
55
56
57
58
59
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
100 ml line Time Flow (sec) (ml/min) 100 ml line
Time Flow
(sec) (ml/min)
139
90
67
137
92
65
133
94
64
130
96
62
128
98
61
125
100
60
122
102
59
120
104
58
118
106
57
115
108
56
113
110
55
111
112
54
109
114
53
107
116
52
105
118
51
103
120
50
101
Time & Flow Rate
100
using 50 ml line
97
94
60
50
91
61
49
88
62
49
86
63
47
83
65
46
81
66
45
79
68
44
77
70
43
75
72
42
73
74
41
71
76
39
70
78
38
68
81
37
83
85
87
90
93
96
100
104
108
112
116
120
125
130
135
140
150
160
170
180
190
200
210
225
250
275
300
330
365
425
500
600
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
Accessories and Spare Parts
Description
Cat. No.
Film Solution, 1 pint, (473 ml)
Precision Digital Stopwatch
Replacement Connecting Hose (2 pieces)
Replacement Squeeze Bulb
Replacement Flowmeter Sidearm Cap
302-4011
303-01-1
P3032101
P3032311
P3032312
www.skcinc.com
Form #3701 — Rev 0803
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