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.-ZM�.r"f.v6.. c r sr�6_s!� ELa .F Q <br />Sensor conditioning <br />The Magmeter output signal may be unstable immediately after installation. Allowing the sensor to soak in a full pipe (or in any <br />container of water) for 24 hours will stabilize the performance. <br />• Very low conductivity fluids may require a longer conditioning period. (The Magmeter will not operate properly in fluids where the <br />conductivity is less than 20 pS/cm.) <br />Grounding <br />The 2551 Magmeter is unaffected by moderate levels of electrical noise. However, in some applications it may be necessary to <br />ground portions of the system to eliminate electrical interference. The grounding requirements will vary with each installation. <br />1. One or more of the following steps may be applied if the <br />2551 Magmeter is affected by electrical noise: <br />• The ground terminal on the outside of the yellow housing <br />is connected internally to the grounding ring at the tip of <br />the sensor. <br />Connect a wire (14 AWG/2.08 mm2 recommended) from <br />this terminal directly to a local Earth ground. 'nstrume"` <br />2. Install fluid grounding devices immediately upstream and <br />downstream of the Magmeter. <br />• Connect the fluid grounds to the Earth ground terminal on <br />the 2551. <br />• Use flanged grounding rings or metal electrodes on plastic <br />pipes, or metal clamps on metal pipes. <br />• Fluid grounds must be in direct contact with the fluid, and <br />as near to the Magmeter as possible. <br />3. The shield from the output cable must be terminated at the <br />remote instrument ONLY. <br />This shield must be connected at only one end! <br />4. Connect an additional wire (minimum AWG 14/2.08 mm2) <br />from the remote instrument ground to the Magmeter <br />ground terminal. <br />Do not terminate <br />Shield at Magmeter <br />O <br />The 2551 -XX -12 Magmeter is a traditional 2 -wire passive 4 to 20 mA loop transmitter. <br />Sensor <br />Gmunding nng <br />4 in. to 50 in. <br />Mi <br />(10 cm to 1-3 m) (10 an to 1.3 m) <br />Grounding rings on plastic pipe .A <br />I \�J (Install behveen flanges) lam/ I <br />L— or =J <br />metal shaps on metal pipe <br />Earth ground <br />• External loop power (24 VDC ± 10%) is required. See Ordering Information for power supplies. <br />• The maximum loop resistance the Magmeter can accommodate is 3000. <br />• All 2551 -XX -12 Magmeters are shipped from the factory with the 4 to 20 mA output scaled for 0 to 5 m/s (0 to 16.4 ft/s). If this <br />operating range is suitable, no adjustments are necessary. <br />• The Calibration Tables on pages 8-9 list the 20 mA setpoint for each installation fitting. Use this information to program the 4 to <br />20 mA range of the loop device (PLC, Datalogger, recorder, etc.) <br />• The 3-0250 USB to Digital (SIL) Configuration/Diagnostic Tool is required to change the operating range. <br />2551 Magmeter <br />Loop - (Ground) 4-20 mA Loop <br />+ monitor <br />(Maximum 300 Q) <br />24 VDC f 10% <br />2551 Blind Magmeter +GF+ <br />