Manual

ManualsBrandsSKC ManualsEquipment303 Film Flowmeter

Soap Film Flowmeter

Cat. No. 303

SKC primary standard ﬂ owmeters are designed, manufactured, and tested for accuracy; no calibration

is needed. Read the operating instructions thoroughly before operating the ﬂ owmeter.

Principle of Operation

The air sampling pump to be calibrated is connected to and pulls air through the ﬂ owme-

ter’s volumetric glass tube where a ﬂ at soap bubble (ﬁ lm) is interposed into the ﬂ ow path.

As the airﬂ ow causes the ﬁ lm 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. The

303 Portable Flowmeter Kit is calibrated to a primary standard ± 2% of the volumes marked

on the ﬂ owmeter.

Assembly

SKC Model 303 is shipped ready to use. Film solution is supplied as well as a length of rubber

tubing to connect the ﬂ owmeter to the pump.

Preparing for Operation

1. Remove the ﬂ owmeter from the case, and place it upright on a level surface.

2. Remove the large rubber stopper from the top of the ﬂ owmeter.

3. Tip the ﬂ owmeter at an angle, and pour a small amount of ﬁ lm solution into the top of

the glass tube. The liquid should run down into the rubber bulb at the bo om.

4. Continue adding ﬁ lm solution until it completely ﬁ lls 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 ﬂ owmeter.

Wetting the Walls of the Tube

The interior walls of the ﬂ owmeter must be wet for the ﬁ lm to travel without rupture. There

are two methods:

Method 1

1. Tip the ﬂ owmeter to a horizontal position. Allow the ﬁ lm solution to run out of the rub-

ber bulb and into the tube.

2. Maintaining the horizontal position, rotate the ﬂ owmeter so that ﬁ lm 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 ﬂ owmeter.

3. Return the ﬂ owmeter to an upright position and allow the liquid to ﬂ ow back down

into the rubber bulb. Squeeze the bulb occasionally to release trapped air.

Method 2

1. Connect a pump to the ﬂ owmeter (see Connecting a Pump).

2. Turn on the pump. Each successive ﬁ lm that rises up the tube will wet the glass. The

walls are suﬃ ciently wet when the ﬁ lm bubbles successfully reach the highest volume

mark on the ﬂ owmeter.

Operating Instructions

863 Valley View Road, Eighty Four, PA 15330 USA

Tel: 724-941-9701 Fax: 724-941-1369 www.skcinc.com

Summary of content (4 pages)

PAGE 1
Operating Instructions 863 Valley View Road, Eighty Four, PA 15330 USA Tel: 724-941-9701 Fax: 724-941-1369 www.skcinc.com Soap Film Flowmeter Cat. 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.
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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.
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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.
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Flow Chart for 303 Calibrator 100 ml line Time Flow (sec) (ml/min) 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) 43 139 44 137 45 133 46 130 47 128 48 125 49 122 50 120 51 118 52 115 53 113 55 111 55 109 56 107 57 105 58 103 59 101 60 100 62 97 64 94 66 91 68 88 70 86 72 83 74 81 76 79 78 77 80 75 82