User Manual - Instrumart
Contents
1. able to compute a K Factor To convert a velocity into a volumetric flow rate you need to know the velocity and the inside pipe diameter Also keep in mind that one US gallon of liquid is equal to 231 cubic inches Example 3 Known values are Velocity 4 3 ft sec Inside Diameter of Pipe 3 068 in Find the area of the pipe cross section Area nr 3 068 Area n T x 2 35 7 39 in 2 Find the volume in one foot of travel 88 71in ft 7 39 in x 12 in 1 ft Determine what portion of a gallon one foot of travel represents 88 71 in 231 in 0 384 gallons So for every foot of fluid travel 0 384 gallons will pass Determine the flow rate in gpm at 4 3 ft sec 0 384 gallons x 4 3 fps x 60 sec 1 min 99 1 gom Now that you know the volumetric flow rate all you need is the output frequency to determine the K Factor Known values are Il Frequency 700 Hz By measurement Flow Rate 99 1 gpm By calculation 700 Hz x 60 sec 42 000 pulses per gallon 42 000 pulses per min K factor 423 9 pulses per gallon 99 1 gpm 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 outstand2. Input Voltage 8 5 30V DC diode protected Maximum Current Draw 18 mA using internal resistor 30V DC input Environmental Operating Temperature 22 158 F 30 70 C Inputs Magnetic Pickup 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 VH Power input voltage 0 7V DC VL Less then 0 4V maximum input power Internal Pullup Resistor 3 6 KQ enabled disabled by jumper Pulse Output using external pullup resistor Maximum Current 100 mA VH Input voltage to external pullup resistor VL VH selected resistor value 47 Q x 470 Pulse Length 150 us 1 ms 25 ms 100 ms 500 ms 1 s or auto mode Pollution Degree 2 Enclosure Killark aluminum capped elbow Y 3 Agency Listings Ordinary Locations CSA Enclosure Only Class I Div 1 amp 2 Groups C amp D Class Il Div 1 amp 2 Groups E F and G and Class III caused by condensation must be expected K Factor Scaler CSA C22 2 No 61010 1 12 UL61010 1 Normally only non conductive pollution occurs Occasionally a temporary conductivity Overvoltage Category Ill IMPORTANT category IV Primary supply level Distribution level fixed installation with smaller transient ov
3. Scaler Power sources and receiving devices differ in individual situations requiring the use of different pullup resistor values Connection of the external pullup resistor is between the receiving device s input and external power source see Figure 4 The power source voltage is the maximum input voltage of the pulse to the receiving device See the following equation to help determine the pullup resistor value needed _ Supply Voltage Current R Resistor value in ohms Supply Voltage External supply voltage connected to the external pullup resistor Current Input current required by the receiving device in amps After the resistor value is calculated make sure that power P is less than or equal to 0 25 Watts Power P represents the output power capability This value should not exceed 0 25 Watts or damage to the K Factor Scaler circuit is likely Raising the resistor value will decrease the available power output and safeguard the circuit fe Open Collector t 7 Pulse Output 100 mA t Maximum i Ei O ooon Internal Figure 4 Wiring schematic using an external pullup resistor 250 10k Pullup Resistor V To determine the maximum current available using a specific pullup resistor use the following equation 0 25 Watts External Pullup Resistor Current Draw STARTUP Using Optional Programming Software Kit B220 900 Software sold separately The programmable K Factor Scaler can be f
4. an output frequency of 16 666 Hz would be equal to 1 gpm If the frequency counter registered 33 333 Hz 2 x 16 666 Hz then the flow rate would be 2 gpm Finally if the flow rate is 2 gpm then the accumulation of 1000 counts would take place in 30 seconds because the flow rate and hence the speed at which the 1000 counts is accumulated is twice as great Calculating K Factors Many styles of flow meters are capable of measuring flow in a wide range of pipe sizes Because the pipe size and volumetric units the meter will be used on vary it may not possible to provide a discrete K Factor In the event that a discrete K Factor is not supplied then the velocity range of the meter is usually provided along with a maximum frequency output An accurate flow rate and the output frequency associated with that flow rate is required for the most basic K Factor calculation Example 1 Known values are Frequency 700 Hz Flow Rate 48 gpm 700 Hz x 60 sec 42 000 pulses per min 42 000 pulses per min K factor 875 pulses per gallon 48 gpm Example 2 Known values are Full Scale Flow Rate 85 gpm Full Scale Output Frequency 650 Hz 650 Hz x 60 sec 39 000 pulses per min K factor 39 000 pulses per min 458 82 pulses per gallon 85 gpm March 2015 SGN UM 00282 EN 02 Page 7 k Factors Explained The calculation is a little more complex if velocity is used You first must convert the velocity into a volumetric flow rate to be
5. LS Blancett Blancett Signal Conditioner a B220 885 K Factor Scaler and B220 900 Programming Software Kit 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 divider 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 The use of different K Factor values allows the device to display in any number of volumetric measurements such as gallons cubic meters liters barrels and like units The calibration sheet usually provided with a turbine meter lists a nominal K Factor tested to a specific volumetric flow rate The K Factor when placed into the K Factor Scaler provides an output pulse for each unit of volume that passes through the turbine Any units of volume are possible by recalculating the K Factor with the appropriate conversion factor In addition if the K Factor is set to one the K Factor Scaler becomes a preamplifier converting the frequency from a low output level turbine meter to the logic level needed by a PLC or CPU data acquisition card The programmable K Factor Scaler provides a lower cost alternative to the Blancett model B220 880 K Factor Scaler The p
6. Pulse Output m Pulse Output O High m O High m Olow r Olow r Program Read Verify Status Idle Com Port 1E Figure 8 Programming software screen March 2015 SGN UM 00282 EN 02 Page 5 Startup Setting the K Factor The K Factor is the ratio of input pulses per each output pulse and can be viewed as a divisor The minimum K Factor can be set to one where each input pulse yields an output pulse The maximum K Factor can be set to 999 999 999 where it would take this many input pulses to yield one output pulse The K Factor is set by entering it in the Program Values column of the software in the K Factor field Press Program to program the K Factor but note that all values must be entered before programming is allowed by the software Setting the Output Pulse Width The output pulse width is the length of time the pulse remains active before resetting to its original state The K Factor Scaler has a total of six different pulse widths to choose from Some end devices require that the pulse be a certain length or longer in order for proper detection of each incoming pulse For these devices it is important to select a pulse width that is long enough for the end device to recognize See Figure 8 for software control placement The pulse width option is set by selecting the desired pulse width radio button in the Program Values column of the software Press Program to program the pulse width option into the board but
7. actory or user configured through the serial port of a PC by a Windows compatible software utility A programming adapter that interfaces the serial port of the PC to the programming port on the board is required To program the K Factor Scaler 1 Make sure the power is off Then connect the adapter cable to the K Factor Scaler board using the programming port see Figure 2 Connect the serial to TTL converter to the adapter cable See Figure 5 3 Attach the serial extension cable to the serial to TTL converter and connect the opposite end to the PC nine pin serial port NOTE For computers without a 9 pin serial port a serial to USB converter may be required 4 Turn on the power to the K Factor Scaler NOTE Power to the K Factor Scaler is required in order to perform any programming N Figure 5 Interface connection Page 4 SGN UM 00282 EN 02 March 2015 Startup The programming interface uses two functional divisions as shown in Figure 8 The Program Values column contains the user selected information for downloading into the K Factor Scaler The Board Values column shows the information that the K Factor Scaler currently contains and is not alterable by the user The Board Values column will only display the contents of the board after performing a Program Read or Verify function Selecting the Com Port Selecting the pro
8. are will show the message lt lt ERROR Invalid Com Port gt gt when trying to program the board If the incorrect Com port is selected or if there is a problem with the cable the software will show the message lt lt No Response gt gt after trying to program the board NOTE All information in the Program Values column is required before the software allows the downloading of information Press Program to download the K Factor pulse width and pulse output values to the K Factor Scaler At the completion of the programming cycle the circuit performs automatic verification of the downloaded information If disconnected from the power the K Factor Scaler retains downloaded values in memory Press Read to load the current information from the K Factor Scaler and display it in the Board Values column Verify performs the same function as Read but compares the Board Values to the Program Values and displays an error if the two do not match Configuration File Tools Version g Program Values Board Values Configuring the K Factor Scaler involves the following four steps en eee 1 Setting the K Factor divider 2 Setting the output pulse width Pulse Width Pulse Width 3 Setting the pulse output level normally high or normally low Ries Ree 4 Setting the output pulse to use the internal or external pullup resistor oam Ser 500ms 500ms O 1s O 1s Auto Auto m
9. ervoltage than installation For this CSA rating to be valid the circuit board must be mounted in a certified Killark one inch model Y 3 conduit outlet box Page 2 SGN UM 00282 EN 02 March 2015 Installation INSTALLATION The board connections include power input turbine meter input and the pulse output to a totalizing device See Figure 2 for the I O terminal connections Internal 3 6k Q Pullup Resistor Jumper Programming Port Output Output Vin Vin Signal Input Figure 2 Input Output terminal connections Enclosure Mounting necessary for CSA certification If the circuit board assembly is supplied without an enclosure it must be mounted in a certified Killark one inch NPT model Y 3 conduit elbow outlet box to maintain the CSA Ordinary Locations certification Electrical Connections The board connections include power input turbine meter input and the pulse output to a totalizing device Power The K Factor Scaler requires 8 5 30V DC to operate and is diode protected Figure 2 shows the supply polarity Turbine Meter The turbine meter connections are non polarized Blancett recommends shielded twisted pair wire for this connection Pulse Output Either the internal or an external pullup resistor is required for the K Factor Scaler to provide an output pulse An onboard jumper controls the pullup resistor selection With the jumper installed the internal pullup resistor is c
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11. note that all values must be entered before programming is allowed by the software In addition to the six preset pulse widths another option Auto mode is available Auto mode acts in the same manner but does not restrain the output pulse to a specific length Instead it varies and is dependent on output frequency The higher the output frequency the shorter the pulse width output The lower the frequency output the longer the pulse width output This option turns off the Pulse Output selection buttons because they do not apply in this mode 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 Press Program to program the selected pulse output into the board but note that all values must be entered before programming is allowed by the software When the pulse output option High is selected the output level is normally low and the duration of the selected pulse width is high When the pulse output option Low is selected the output level is normally high and the duration of the selected pulse width is low Setting the Output to Use the Internal or External Pullup Resistor Either the internal pullup resistor or an external resistor must be used for the K Factor Scaler to provide an output pulse This o
12. onnected Without the jumper an external pullup is required See Figure 2 for the I O terminal connections Internal Pullup Resistor The internal pullup resistor allows for a simple installation but be careful to ensure that the device being connected to the pulse output can accept voltage levels as high as the supply feeding the K Factor Scaler Another important setup consideration when using the internal pullup resistor is to make certain the output pulse from the K Factor Scaler can supply enough current for the receiving device to read the pulse Calculation of the available current that the K Factor Scaler can supply to the receiving device uses the following equation Input Voltage 0 7V 36000 470 Available Current Using the above equation the maximum current available at an input voltage of 30V is 8 mA Verify that the receiving device input current requirement is below this value for proper operation Otherwise an external pullup resistor less than 3 6 kQ is required Internal 3 6k Q Pullup Resistor Jumper Open Collector L Output 3 Pulse Output put pa 1 1 1 1 Output 3 i f 1 1 1 Internal o 0 Vin Figure 3 Wiring schematic with internal pullup resistor in circuit March 2015 SGN UM 00282 EN 02 Page 3 Startup External Pullup Resistor Using an external pullup resistor offers the end user greater flexibility in controlling the output pulse provided by the K Factor
13. per Com port within the Blancett K Factor programming software is required for the software to communicate with the board From the menu bar select Tools and then Com Port Select the Com port 1 16 that the serial programming cable is connected to on the computer Blancett K Factor Programming Software Be x Blancett K Factor Programming Software Ele x File Tools Version File Tools Version Program falues Board Values Program falues Board Values Read Read Verify r m K Factor Verify r p K Factor Com Port gt v Com1 o __ Com 2 Com 3 p Pulse Width m Pulse Width Com 4 pm Pulse Width Pulse Width 150us 150us Cons 150us 150us ims Ims Com 6 ims Ims 25ms 25ms Com 7 25ms 25ms 100ms 100ms Com 8 100ms 100ms 500ms 500ms Com 9 500ms 500ms O 1s Os Com 10 1s O 1s Auto Auto Com 11 Auto Auto Com 12 m Pulse Output p Pulse Output Com13 m Pulse Output p Pulse Output O High m O High m Com TA O High m O High m Olow ar Olow r Com 15 Olo r Olow r Com 16 Program Read Verify Program Read Verify Status Idle Com Port 1 Status Idle Com Port 1 Figure 6 Tools drop down Figure 7 Com port menu drop down If the Com port selected is invalid the softw
14. ption is controlled by the onboard jumper and not by the software With the jumper installed the internal 3 6 kQ pullup resistor is connected to the input voltage of the board With the jumper removed the internal pullup resistor is disconnected and an external pullup resistor and supply voltage are required Page 6 SGN UM 00282 EN 02 March 2015 K Factors Explained K FACTORS EXPLAINED The K Factor with regards to flow is the number of pulses that must be accumulated to equal a particular volume of fluid Think of each pulse as representing a small fraction of the totalizing unit An example might be a K Factor of 1000 pulses per gallon This means that if you were counting pulses when the count total reached 1000 you would have accumulated 1 gallon of liquid Using the same reasoning each individual pulse represents an accumulation of 1 1000 of a gallon This relationship is independent of the time it takes to accumulate the counts The frequency aspect of K Factors is a little more confusing because it also involves the flow rate The same K Factor number with a time frame added can be converted into a flow rate If you accumulated 1000 counts one gallon in one minute then your flow rate would be 1 gpm The output frequency in Hz is found simply by dividing the number of counts 1000 by the number of seconds 60 to get the output frequency 1000 60 16 6666 Hz If you were looking at the pulse output on a frequency counter
15. rogrammable version uses fewer components reducing the size of the board and enclosure OPERATING PRINCIPLE Fluid passing through the turbine causes the rotor to spin at a speed proportional to the fluid velocity As each rotor blade passes through the magnetic field the blade generates an AC voltage pulse in the pickup coil at the base of the magnetic pickup see Figure 1 These pulses produce an output frequency proportional to the volumetric flow through the meter The output frequency with further processing represents flow rate and or totalization of fluid passing through the flow meter The K Factor Scaler input amplifier modifies the signal generated by the turbine The amplifier sends the modified signal to an onboard microcontroller which counts pulses up to a predetermined number controlled by the K Factor value The range of the K Factor is 1 999 999 999 The predetermined value once reached triggers a pulse from the output circuitry The K Factor is user adjustable through the programming interface The duration of the output pulse is also selectable At the end of the output pulse the internal counters reset to zero and the process starts over Magnetic Pickup or Other Frequency Output Device Output Signal Figure 1 Schematic illustration of electric signal generated by rotor movement Badger Meter SGN UM 00282 EN 02 March 2015 U se r M a n u a Specifications SPECIFICATIONS External Power
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