Sensor/Transducer F-to-V or F-to-I Active Sensor INTRODUCTION The Blancett Active Sensor is a state-of-the-art, digital signal processing device designed to provide exceptional accuracy at a very affordable price. Designed for use with turbine meters, the sensor measures and calculates the flow rate to produce an analog current or voltage output representative of the meter’s flow rate. IN O PUT M UTP : 10 N AX INUT: - 3 U EMA PU 4 - 0 VD C SE IN 4X T C 20 m C CLLASS CL, TEMURR A AS II AS P EN S II , G S I, CO T: I RO G DE 25 UP RO T mA S E UP 6 S , MAF & G B, C DE , &D IN , US A The Active Sensor is offered in two versions with a wide range of compatible turbine flow sensors: • The F-to-I converter provides a 4…20 mA output in a two wire, loop powered configuration. • The F-to-V converter offers a 0…5V DC output for those applications where a Voltage output is preferred. • Can be used with Blancett 1100, QuikSert, and FloClean series turbine flow sensors. OPERATING PRINCIPLE Fluid entering the meter passes through the inlet flow straightener which reduces its turbulent flow pattern and improves the fluid’s velocity profile. Fluid then passes through the turbine, causing it to rotate at a speed proportional to the fluid velocity. As each turbine blade passes through the magnetic field at the base of the magnetic pickup, an AC Voltage pulse is generated in the pickup coil (see Figure 1). These pulses are converted to either a current or Voltage that is proportional to the volumetric flow through the meter. INPUT: 10 - 30 VDC OUTPUT: 4 - 20 mA MAX INPUT CURRENT: 25 mA NEMA 4X, TEMP CODE T6 USE IN CLASS I, GROUPS B, C & D, CLASS II, GROUPS E, F & G, CLASS III MADE IN USA ACTIVE PICK-UP METER BODY INPUT: 10 - 30 VDC OUTPUT: 4 - 20 mA MAX INPUT CURRENT: 25 mA NEMA 4X, TEMP CODE T6 USE IN CLASS I, GROUPS B, C & D, CLASS II, GROUPS E, F & G, CLASS III MADE IN USA TURBINE ROTOR ACTIVE PICK-UP OUTPUT SIGNAL Figure 1: Schematic illustration of electric signal generated by rotor movement Figure 2: Typical turbine flow meter with active sensor installed SPECIFICATIONS Power Frequency to Current (F-to-I) Frequency to Voltage (F-to-V) Inputs Frequency Trigger Sensitivity Frequency Measurement Accuracy Analog Output Resolution Temperature Drift Linearization Threads Environmental Ambient Temperature Humidity SEN-UM-00084-EN-02 (July 2014) Loop powered, 6 V insertion loss maximum 10…30V DC supply range 10…30V DC supply range (3-wire output) Magnetic Pickup 0…3500 Hz 30 mV p-p ±1% 4…20 mA current loop 1:4000 50 ppm / °C (max) 10 point using IFC programming utility (PN B220-953) 5/8-18 UNF –22…158° F (–30…70° C) 0…90% non-condensing User Manual Connection CONNECTION The 4…20 mA output can drive auxiliary devices (resistive loads) such as displays, recorders and computers, provided the voltage supplied by the power source is adequate. Devices must be wired in series with the F-to-I converter and power supply. The voltage drop across the load(s) and the 6V DC minimum needed to drive the F-to-I converter determine the minimum voltage required from the power supply. The F-to-I converter acts as a current controlling device. Thus, the current output remains the same even if the power supply voltage fluctuates or the load resistance changes. The current varies only with respect to the flow rate from the turbine flow meter, as long as the voltage drop across the F-to-I converter is at least 6V DC. The load(s) in the circuit generally have some electrical resistance, 100 Ohms for this example. The 4…20 mA loop current produces a Voltage drop across each load. The maximum Voltage drop across a load(s) exists when the loop current is 20 mA. The power supply must provide enough Voltage for the load(s) plus the 6V DC minimum insertion loss of the F-to-I converter. Figure 5 shows a graphical representation of the allowable loads for a given power supply voltage. F to I Converter 24V DC Power Supply 4…20 mA F to I Converter 4…20 mA 150 100 50 Ohms Ohms Ohms 24V DC Power Supply 1000 Ohms Total load resistance = 300 Ohms Total current loop current = 20 mA 300 Ohms x 20 mA = 6000 mV = 6 Volts The total voltage drop across the load is 6 Volts. Total load resistance = 1000 Ohms Total current loop current = 20 mA 1000 Ohms x 20 mA = 20,000 mV = 20 Volts The total voltage drop across the load is 20 Volts Figure 3: Example 1—Sufficient power supply Voltage Figure 4: Example 2—Insufficient power supply Voltage Example 1 shows an installation where the available voltage from the power supply is sufficient to accommodate a 6 Volt drop. Subtract 6 Volts from the 24 Volt source to determine that 18 Volts are available to power the F-to-I converter. The 18 Volts is within the specified 10…30 Volt range and is sufficient to power the F-to-I converter. Example 2 shows an installation where the available voltage from the power supply is not sufficient to accommodate a 20 Volt drop. Subtract 20 Volts from the 24 Volt source to determine that 4 Volts is available to power the F-to-I converter. The 4 Volts is below the specified 10…30 Volt range so is not adequate to power the F-to-I converter. If for example, the power supply voltage was 30 Volts instead of 24 Volts, the Voltage available to power the F-to-I converter would be 10 Volts and within the specified range. Loop Load (Ohm's) 1400 1200 1000 800 600 Operate in the Shaded Region 400 200 10 12 14 16 18 20 22 24 26 28 30 Supply Voltage (VDC) Figure 5: Allowable loop resistance chart Page 2 SEN-UM-00084-EN-02 July 2014 Operation OPERATION Once power is applied, the converter outputs an analog value representative of the measured frequency from the turbine meter. See Figure 6 or Figure 7—whichever corresponds to the converter that you have selected for your application. 3 2 4 3 2 + 4…20 mA - 4…20 mA N.C. N.C. N.C. 1 5 CONVERTER MALE CONNECTOR PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 RED BLACK WHITE + 4…20 mA (Sink) - 4…20 mA (Source) No Connection 4 5 1 CABLE CONNECTOR CABLE ASSEMBLY B220952-6 6 FT. B220952-15 15 FT. (RED) + Loop (BLACK) - Loop (WHITE) N.C. Figure 6: Frequency to current output wiring 3 2 4 3 2 10…30V DC SIGNAL GND N.C. N.C. 1 5 CONVERTER MALE CONNECTOR PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 RED BLACK WHITE 10…30V DC SIGNAL 0V 4 5 1 CABLE CONNECTOR CABLE ASSEMBLY B220952-6 6 FT. B220952-15 15 FT. (RED) 10…30V DC (BLACK) SIGNAL (WHITE) 0V Figure 7: Frequency to Voltage output wiring NNOTE: If your active sensor was purchased with a Blancett turbine meter, the two components ship from the factory calibrated as a set. If the active sensor is a replacement, the turbine’s K factor has changed, or the sensor is being used with some other pulse-generating device, programming is necessary. PROGRAMMING NNOTE: For complete instructions on programming the Blancett intelligent converters see the IFC Programming Manual. Requirements • Sensor/Transducer IFC programming kit PN B220-953 • RS232 cable (connects programming cable to PC) • IBM Compatible PC running Windows® 95 or newer operating system • DC Power Supply Cable Assembly B220952-6 6 ft. B220952-15 15 ft. Active Sensor (RED) 10…28V DC (BLACK) SIGNAL (WHITE) 0V Cable To Computer RS-232 TO TTL Converter Model 232LPTTL TTL RS-232 TTL to RS232 Converter Cable Assembly Blancett P.N. 6558 Figure 8: 6558 programming cable connections NNOTE: The TTL-to-RS232 converter may be as shown in Figure 8 or it may be a black molded model. July 2014 SEN-UM-00084-EN-02 Page 3 1. Install the programming software. 2. Attach the programming cable (Figure 8) to the active sensor through a Com port on your PC. NNOTE: For computers without an RS232 serial port, you may need a USB-to-serial converter. 3. Using a DC power supply, apply 10…30V DC to the active sensor. 4. Start the IFC programming software. The first screen should appear as in Figure 9. NNOTE: If communication fails, check cabling and/or Com port address and try again. IFC Programming Utility File Options Tools Setup Device: 4-20mA Rate Units: Gallons Rate Interval: Minute K Factor Units: Pulses/Gallon K Factor: Damping: 0-5V Read Setup 350.400 Download Setup 0 Flow at 4mA 4mA: 0.000 Flow at 20mA 50.000 Linear Points: 0 Status: Com1 Linear Points 9/23/2008 4/25/2013 Frequency 0 0 0 0 Hz Monitor On Off 2:33 PM Figure 9: IFC programming screen 5. Press Read Setup to view how the converter is currently programmed. 6. Make any necessary changes and press Download Setup. MAINTENANCE 1. Make frequent inspections. Create a schedule for maintenance checks based on the environment and frequency of use. 2. Perform visual, electrical and mechanical checks on all components on a regular basis. a. Visually check for undue heating evidenced by discoloration of wires or other components, damaged or worn parts, or leakage evidenced by water or corrosion in the interior. b. Electrically check to make sure that all connections are clean and tight, and that the device is operating correctly. DIMENSIONS A B Figure 10: Active sensor dimensions A B 4.28 in. (109 mm) 1.15 in. (29 mm) TROUBLESHOOTING GUIDE Trouble No Current Output Analog output reads a constant reading Analog output is not stable Remedy Check polarity of the current loop connections for proper orientation. Make sure receiving device is configured to provide loop current. Make sure there is flow in the system. Verify that the rotor inside the turbine meter turns freely. External noise is being picked up by the sensor. Keep all AC wires separate from DC wires. Check for radio antenna in close proximity. This usually indicates a weak signal. Control. Manage. Optimize. Blancett is a registered trademarks of Badger Meter, Inc. Other trademarks appearing in this document are the property of their respective entities. Due to continuous research, product improvements and enhancements, Badger Meter reserves the right to change product or system specifications without notice, except to the extent an outstanding contractual obligation exists. © 2014 Badger Meter, Inc. All rights reserved. www.badgermeter.com The Americas | Badger Meter | 4545 West Brown Deer Rd | PO Box 245036 | Milwaukee, WI 53224-9536 | 800-876-3837 | 414-355-0400 México | Badger Meter de las Americas, S.A. de C.V. | Pedro Luis Ogazón N°32 | Esq. 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