TM 10-4610-215-24TM 08580A-242e. RepairorReplce.(1) Replace damaged, unrepairable, or unserviceable flowmeter assembly.(2) Send replaced unusable product water flowmeter assembly to next higher level of maintenance.3-28. BACKWASH WATER FLOWMETER.a. General.The BACKWASH WATER FLOWMETER shows the rate of brine water flOW IntO the multimediafilter during the backwash operation. This paragraph describes test and inspection of the BACKWASH WATERFLOWMETER.b. Removal. If necessary, remove backwash water flowmeter assembly in accordance with paragraph 2-69.CAUTIONBe sure to attach water source to inlet port of meter, which ismarked IN. Running water backwards into the outlet port candamage meter.NOTEPipe leading to meter inlet (IN) for test must be straight for atleast 20 inches (50 cm) before entering meter. Otherwise, testwill not be accurate.(1) Attach inlet port of a meter to a straight pipe, at least 20 inches (50 cm) long, leading to a meteredsource. The source must have an output range of 20 to 150 gpm (76 to 568 Ipm).NOTEIf no metered source is available, run the source into agraduated tank for 1 minute to determine exact flow rate.(2) Run water through meter at a rate of 25 gpm (95 Ipm). If meter reading varies from flow rate by morethan 0.75 gpm (2.8 Ipm), discard meter.(3) Run water through meter at a rate of 80 gpm (303 Ipm). If meter reading varies from flow rate by morethan 2.4 gpm (9.1 Ipm), discard meter.3-112c. Test.
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