INTRODUCTION

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
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