Signal Conditioner B220-885 K Factor Scaler and B220-900 Programming Software Kit SGN-UM-00282-EN-01 (November 2013) User Manual
Signal Conditioner, B220-885 K Factor Scaler and B220-900 Programming Software Kit Page ii November 2013
User Manual CONTENTS INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 OPERATING PRINCIPLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 SPECIFICATIONS . . . . . . . . . .
Signal Conditioner, B220-885 K Factor Scaler and B220-900 Programming Software Kit Page iv November 2013
User Manual INTRODUCTION The Blancett K Factor Scaler is a field adjustable frequency divider, which converts the output signal from a turbine meter or like device with a magnetic pickup or pulse output to an input compatible with a PLC, RTU, CPU data acquisition card or similar totalizer device. The adjustable frequency divisor, referred to as a K factor, allows pulses sent from a turbine meter to accumulate into a unit recognizable by an end device, such as a PLC, for counting and display.
Signal Conditioner, B220-885 K Factor Scaler and B220-900 Programming Software Kit SPECIFICATIONS External Power Input Voltage 8.5…30V DC (diode protected). Maximum Current Draw 18 mA (using internal resistor @ 30V DC input). Environmental Operating Temperature Inputs (Magnetic Pickup) –22…158° F (–30…70° C). Frequency Range 0…4000 Hz. Trigger Sensitivity 30 mV p-p…30V p-p. Output Signal Max Voltage 30V DC. Max Power 0.25 W. Pulse Output (using internal pullup resistor) Maximum Current 8 mA.
User Manual INSTALLATION Refer to Figure 2 for the I/O terminal connections. The board connections include power input, turbine meter input, and the pulse output to a totalizing device. Programming Port 2 3 4 5 6 Signal Input 1 Output Output Vin Vin Internal 3.
Signal Conditioner, B220-885 K Factor Scaler and B220-900 Programming Software Kit Internal 3.6k Ω Pullup Resistor Jumper Open Collector Pulse Output 1 Output TB1 3 Vin 2 Output 8 mA Maximum 4 Vin 3.6k Ω 5 6 Internal Vin Figure 3: Wiring schematic with internal pullup resistor in circuit External Pullup Resistor Using an external pullup resistor offers the end user greater flexibility in controlling the output pulse provided by the K Factor Scaler.
User Manual To determine the maximum current available using a specific pullup resistor use the following equation. Current Draw = 0.25 Watts External Pullup Resistor STARTUP Using Optional Programming Software Kit B220-900 (Software sold separately) The programmable K Factor Scaler can be factory or user configured through a serial port of a PC by a Windows compatible software utility. A programming adapter is required that interfaces the serial port from the PC to the programming port on the board.
Signal Conditioner, B220-885 K Factor Scaler and B220-900 Programming Software Kit Blancett K-Factor Programming Software Blancett K-Factor Programming Software File Options Tools Tools Version File File Options Tools Tools Version File Program Program Values Read Verify K-Factor Com Port Board Values K-Factor Pulse Width Pulse Width 150us 1ms 25ms 100ms 500ms 1s Auto 150us 1ms 25ms 100ms 500ms 1s Auto Pulse Output Pulse Output High High Low Low Program Read Status: Com1 Idle Com Com Com
User Manual Blancett K-Factor Programming Software File Options Tools Tools Version File Program Values Board Values K-Factor K-Factor Pulse Width Pulse Width 150us 1ms 25ms 100ms 500ms 1s Auto 150us 1ms 25ms 100ms 500ms 1s Auto Pulse Output Pulse Output High High Low Low Program Status: Com1 Idle Read Verify 9/23/2008 Com Port 1 Figure 8: Programming software screen Setting the K Factor The K factor is the ratio of input pulses per each output pulse and can be viewed as a divisor.
Signal Conditioner, B220-885 K Factor Scaler and B220-900 Programming Software Kit Setting the Output Level Normally High or Normally Low Most end devices will be unaffected by this setting but the K Factor Scaler has the ability to invert the output pulse level. This option is set by selecting the desired pulse output radio button in the Program Values column of the software.
User Manual Example 2 Known values are: Full Scale Flow Rate = 85 gpm Full Scale Output Frequency = 650 Hz 650 Hz × 60 sec = 39,000 pulses per min K factor = 39,000 pulses per min 85 gpm = 458.82 pulses per gallon The calculation is a little more complex if velocity is used because you first must convert the velocity into a volumetric flow rate to be able to compute a K factor.
Signal Conditioner, B220-885 K Factor Scaler and B220-900 Programming Software Kit Now that the volumetric flow rate is known, all that is needed is an output frequency to determine the K factor. Known values are: Frequency = 700 Hz (By measurement) Flow Rate = 99.1 gpm (By calculation) 700 Hz × 60 sec = 42,000 pulses per gallon K factor = Page 14 42,000 pulses per min 99.1 gpm = 423.
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Blancett is a registered trademark 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. © 2013 Badger Meter, Inc. All rights reserved. www.badgermeter.
