CM-6001-TM Manual SERIES 12 VARIABLE AREA FLOWMETERS INSTALLATION, OPERATION & SERVICE INSTRUCTIONS 15555 North 79th Place Scottsdale, AZ 85260 tel: (480) 922-7446 fax: (480) 948-3610 Email: sales@cox-instruments.com Web: www.cox-instruments.
Contents Section I II USE AND MAINTENANCE…………………………………… 1-1. Purpose ………………………………………… 1-3. Models ………………………………………….. 1-6. Variations Within Models …………………….. 1-9. Description …………………………………….. 1-24. Specifications ………………………………….. 1-27. Preparation for Use …………………………… 1-29. Installation ……………………………………… 1-30. Operation ………………………………………. 1-38. Maintenance …………………………………… 1-40. Cleaning Tubes and Floats ………………….. 1-42. Parts Replacement ……………………………. 1-44. Replacing Tube Gaskets ……………………... 1-48.
Section I Paragraphs 1-1 to 1-10 SECTION I USE AND MAINTENANCE b. 1-1. PURPOSE. 1-2. The Series 12 flowmeter is an instrument for the accurate and continuous measurement of the rate of flow for liquids and gases at nominal pressures. Orifice valve and calibrated auxiliary bypass orifice to increase the capacity of a particular flowmeter. 1-9. DESCRIPTION. 1-3. MODELS. 1-4. The Series 12 flowmeter is available in three basic models; Model 124, Model 129 and Model 120.
Section I Paragraphs 1-11 to 1-13 NOTE 1-11. TUBES (fig. 2). Tubes are precision molded of borosilicate glass with four float guides and tapered flutes integral with the tube. The inner diameter across the guides is the same from top to bottom but the inner diameter of the tapered flutes expands logarithmically giving an increasing flow area past the float as it rises. The guides confine the float to the central axis of the tube and diminish swirls of fluid passing through the tube.
Section I Paragraphs 1-14 to 1-21 are located in drilled holes in front corners of the tube packing glands and secured by screws. Scales are aligned with tube index line by adjusting the support posts. Packing glands are drilled at each side permitting scales to be mounted on both sides if desired. 1-14. TUBE MOUNTING (fig. 15). Tubes are fitted into upper and lower end castings and are held in position by packing glands. The glands are tightened against gaskets to prevent leakage.
Section 1 Paragraphs 1-22 to 1-29 flowmeter and is designed to burst at a pressure lower than the bursting pressure of the largest tube. The disc is rated to burst at 85 psi. r 5 psi. This provides a bypass through which the flow may be returned to the supply tank. 1-22. LIGHTS. Depending on size and number of stages used, flowmeters can be equipped with explosion proof or non-explosion proof fluorescent lights mounted behind the tubes. 1-23. AIR CYLINDERS.
Section I Paragraphs 1-30 to 1-37 In addition, a thermometer should be installed as close to the inlet of the flowmeter as possible. This will provide a constant check to assure proper flow readings. valve is opened, the tubes below it are inoperative and pressure drop is maintained at a minimum. All valves must be opened when reading last tube. e. The flowmeters are calibrated on a Cox Liquid Calibrator maintaining a 10-15 psig back pressure.
Section I Paragraphs 1-38 to 1-44 2. Determine cause of excessive pressure surges and correct if possible. this reason the repairs and replacements considered are limited to replacement tube gaskets, valve seals, metering tubes, and repair of damaged copper tubing. 3. Replace ruptured blowout disc. 1-44. REPLACING TUBE GASKETS (fig. 9). 1-38. MAINTENANCE. a. Relieve pressure on instrument. 1-39. GENERAL. Periodic cleaning of tubes and floats is necessary to remove all deposit of foreign matter.
Section I Paragraphs 1-45 to 1-49 This thin gasket can be held in position by coating with a thin film of cup grease to prevent shifting while assembling gland and tube. A tube stop washer is then installed as the last item in the bottom gland only. CAUTION Do not use cup grease on flowmeters for oxygen service. g. To assemble, place tube in position with aligning mark toward front. Slip glands into position and secure with cap screws. Tighten screws evenly. h. Install scale and upper support post.
Section I Paragraphs 1-49 to 1-54 1-49. REPAIR OF VALVES. If the valve becomes worn or defective, replacement parts may be purchased from the manufacturer. See Section II for detailed parts lists. 1-52. STORAGE. 1-53. If flowmeter is to be placed in storage, fill tube with oil SAE-10 and open all valves. 1-50. SHIPMENT. CAUTION 1-51. The flowmeter should never be shipped unless carefully boxed and fully protected.
Section I Paragraph 1-55 – 1-55 1-55. BACK LIGHTING MAINTENANCE. Bulb replacement is accomplished as follows: a. Non-Explosionproof (See figures 10 and 11) 1. Disconnect power and electrical wires to shell assembly. 5. Remove and replace defective fluorescent bulb (G.E. P/N F15T12/CW) and/or starter (G.E. P/N FS-2) as required. Maintenance instructions for this operation are printed on the cap inside face. 6. Reinstall the cap removed in the fourth step. 7.
Section I FLOWMETER MODEL CONVERSION KEY MODEL 124-200 124-201 124-202 124-203 124-204 124-205 124-206 124-207 10 SHELL NO.
Section I FLOWMETER MODEL CONVERSION KEY – CONTINUED FUEL (120 – 200 to 120 – 222) OIL (120 – 240 to 120 – 261) GASES (120 – 277 to 120 – 294) SHELL NO.
Section I FLOWMETER MODEL CONVERSION KEY – CONTINUED OIL (129 – 240 to 129 – 271) GASES (129 – 277 to 129 – 304) 129-211 129-212 129-213 129-214 129-215 129-249 129-250 129-251 129-252 129-289 129-290 129-291 129-292 8 1 3 5 5 93 93-95 93-95-97 93-95-97-99 93-95-97-99* 175 14 90 65 65 115 90 60 50 - 129-216 129-217 129-218 129-219 129-253 129-254 129-255 129-256 129-293 129-294 129-295 9 1 3 3 94 94-96 94-96-98 94-96-98* 170 110 75 75 110 70 50 - 129-220 129-221 129-222 129-223 129-257 12
Section II Parts Breakdown SECTION II PARTS BREAKDOWN PART NUMBER DESCRIPTION QTY PER ASSY 13-1 -2 -3 -4 -5 25861 25862 85309 AN6230-8 25867A 5 / 16-24 x 1 BURST DISC ASSEMBLY STRAINER ASSY BLOWOUT DISC “O” RING THREADED END FLANGE SOCKET HEAD SCREW 1 1 1 1 1 4 14- 36638 36634 No Number No Number AN6230-4 AN6230-13 INLET ELBOW ASSY, 2-inch INLET ELBOW ASSY, 3-inch INLET ELBOW, 2-inch INLET ELBOW, 3-inch “O” RING, 2-inch elbow “O” RING, 3-inch elbow 1 1 1 1 1 1 FIGURE AND INDEX NO.
Section II Parts Breakdown 14
Section II Parts Breakdown FIGURE AND INDEX NO.
