Flowmeter 303 Operating Instructions 3701 PDF Document
Contents
1. 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 stop watch 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 Remove the flowmeter from the case and place it upright on a level surface 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 Tube2. 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 rub ber 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 eae 2 Connect a pump to the flowmeter see Connecting a Pump 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 2 3 Remove the rubber cap from the side arm inlet near the base of the flowmeter 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 Using flexible tubing connect the outlet of the sampling med
3. ium to the inlet of the pump Sample Media Outlet Calibration Chamber Outlet upper port Inlet Tygon Tubing Sample Pump Flowmeter Inlet lower Pum p side arm port Inlet Measuring the Flow A 3 Turn on the pump Squeeze the rubber bulb on the flowmeter to force the liquid above the inlet Bubbles film will form 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 mak ing 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 Drager 1 Connect a detector tube to the pump according to the manufacturer s instructions 2 Connect the in
4. let 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 flow meter Bubbles film will begin to form 4 When the film reaches the zero line on the flowmeter compress the bellows pump com pletely 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 flow meter 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 o
5. n 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 100 ml line 100 ml line 100 ml line Time Flow Time Flow Time Flow Time Flow sec ml min sec ml min sec ml min Using 100 ml line 12 500 13 462 14 429 15 400 16 375 17 353 18 333 19 316 20 300 21 286 22 273 23 261 24 250 25 240 231 222 214 Time amp Flow Rate 207 using 50 ml line 200 50 193 49 187 49 182 47 176 171 167 162 158 154 150 146 143 Accessories and Spare Parts Description Cat No Film Solution 1 pint 473 ml 302 4011 Precision Digital Stopwatch 303 01 1 Replacement Connecting Hose 2 pieces P3032101 Replacement Squeeze Bulb P303231 1 Replacement Flowmeter Sidearm Cap P3032312 www skcinc com Form 3701 Rev 0803
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