K-Factor Scalers
Models B220-880, B220-881, B220-882 and B220-885
DESCRIPTION
The Blancett K-Factor Scaler converts a low level frequency output
(such as that from a Blancett turbine flow meter) into a scaled
square wave digital output signal. This adjustable frequency
divider converts or scales the turbine meter output into units of
measurement needed for a particular application and recognized
by almost any data collection device. The k-factor scaler provides an
amplified signal, even when a frequency conversion is not required.
The signal is more immune to electrical noise and capable of
transmission over longer distances than a raw turbine meter output.
FEATURES
• Scales turbine meter output to desired engineering units
• Switch-selectable or programmable versions available
• Converts frequency outputs into recognizable units for PLCs
and other devices
• Amplifies turbine meter pulse output
• CSA approved
OPERATING PRINCIPLE
Fluid moving though a turbine flow meter causes the rotor to rotate
in relation to the flow rate. The rotation of the rotor blades cuts
through the magnetic field generated by the magnetic pick-up
which in turn generates a frequency output signal that is directly
proportional to the speed of the rotor.
The signal produced is received by the K-Factor Scaler input
amplifier, which has an input sensitivity of 30 mV p-p to 30 V p-p.
The signal is then sent to an onboard microcontroller, which acts as
a divisor with a range of 1…999,999,999.
The divisor (K-factor) is user adjustable and set by programming it
into the board. The microcontroller handles the dividing process
by counting the input pulses and comparing it to the programmed
K-factors. Once the count equals this value, an output pulse occurs
for a selectable time period and the counting starts over.
The programmable version comes pre-calibrated from the factory
when ordered with a Blancett Series 1100 turbine flow meter. In
addition, it may be easily configured by the end-user through the
use of a Windows®-based software utility kit (Model B220-900) that
includes a PC serial port interface cable. See Figure 1.
From Turbine Flow Meter
MODELS
Badger Meter offers two versions of the K-Factor Scaler:
• Switch-selectable (Models B220-880, B220-881 or B220-882)
• Programmable (Model B220-885)
The switch-selectable version has a set of eight rotary switches
within the enclosure. The rightmost switch represents the least
significant digit of the k-factor number. For example, if the desired
k-factor is 4572, the switches will be set to 00004572.
SGN-DS-00937-EN-01 (June 2017)
To Computer Serial Port
Figure 1: Programmable k-factor scaler and software
Models B220-880
B220-881
B220-882
K-Factor Storage Yes Yes
No. of Digits 8 9
Range 1…99,999,999 1…999,999,999
K-Factor Entry Rotary switch Electronic input
B220-885
Product Data Sheet
K-Factor Scalers, Models B220-880, B220-881, B220-882 and B220-885
SPECIFICATIONS
External Power
Environmental
Inputs
(Magnetic Pickup)
Output Signal
Pulse Output
(using internal pullup
resistor)
Pulse Output
(using external pullup
resistor)
Enclosure Ratings
Certifications
DIMENSIONS
Input voltage 8.5…30V DC (diode protected)
Maximum current draw 18 mA (using internal resistor @ 30V DC input)
Operating temperature –22…158° F (–30…70° C)
Altitude 2000 m
Use Indoor/outdoor
Humidity 0…90% non-condensing
Frequency range 0…4000 Hz
Trigger sensitivity 30 mV p-p…30V p-p
Max voltage 30V DC
Max power 0.25 W
Maximum current 8 mA
VH = Power input voltage 0.7V DC
VL = Less than 0.4V @ maximum input power
Internal pullup resistor 3.6 kΩ (enabled/disabled by jumper)
Maximum current 100 mA
VH = Input voltage to external pullup resistor
VL = [VH /(selected resistor value + 47 Ω)] × 47 Ω
Pulse length 150 µs, 1 ms, 25 ms, 100 ms, 500 ms, 1 s, or auto mode
Model B220-885
Models B220-880,
B220-881and B220-882
CSA Ordinary location CAN/CSA-C22.2 No. 61010-1-12, UL Std. No. 61010-1 (3rd Edition)
Pollution Degree 2, Overvoltage Category I
3.65
(92.7)
2.78
Killark aluminum-capped elbow, Y3 CSA approved Class I, Div 1 & 2, Groups C, D; Class II, Div 1 & 2, Groups E,
F, G; and Class III
Appleton GR conduit outlet boxes GRL100-A, GRLB100-A and GRT100-A, CSA approved Class I, Div 1, Groups
B, C, D; Class II, Groups E, F, G; and Class III
4.72
(119.9)
3.88
(98.5)
DIA
(70.6)
DIA
3.00
(76.2)
4.72
(119.9)
1" NPT
(TYP)
3.65
(92.7)
1" NPT
(TYP)
Model B220-885 Model B220-880
4.72
(119.9)
3.88
(98.5)
DIA
3.93
(99.8)
1" NPT
(TYP)
(115.8)
3.75
(95.3)
DIA
4.56
1" NPT
(TYP)
2.88
(73.2)
5.37
(136.4)
Model B220-881 Model B220-882
Control. Manage. Optimize.
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 specications without notice, except to the extent an outstanding
contractual obligation exists. © 2017 Badger Meter, Inc. All rights reserved.
www.badgermeter.com
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Legacy Document Number: 02-SGN-BR-00015