20Controller Installation4.1 Unpacking the InstrumentRemove the 950 Flow Meter from its shipping carton and inspect it for any visibledamage. Contact Hach Customer Service at 1-800-227-4224 if any items are missing ordamaged.4.2 Choosing the Proper SiteThe accuracy of your flow measurements greatly depends on the suitability of yourmonitoring site. Select sites that have normalized flow and minimal turbulence.Turbulence can make it difficult to detect an average velocity in the flow stream.Obstructions, vertical drops, pipe bends, and elbows can create turbulence and affect theaccuracy of your measurements. Table 1 contains suggestions for preventing turbulence.4.3 Mounting Options4.3.1 Wall Mounting (Optional)Wall mounting the 950 Flow Meter requires the optional Wall Mounting Bracket (P/N.2743). This bracket provides stable, secure mounting for the flow meter and providesclearance for removing the power supply while the unit is installed. Connect the flowmeter with four ¼-20 screws (provided) using the four threaded inserts on the back of thecase. (See Figure 2).Table 1 Suggestions for Preventing TurbulenceSite Condition Suggested RemedyOutfalls Place the sensor in at least ten times the maximum expected level upstream of the outfall.Vertical drops in thechannel floorPlace the sensor in at least ten times the maximum expected level upstream of the vertical drop.Place the sensor in at least ten times the maximum expected level downstream of the vertical drop.Elbows, sharp turns,and “Y” connectionsPlace the sensor in at least ten times the maximum expected level upstream of the impediment.Place the sensor in at least ten times the maximum expected level downstream of the impediment.
