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K-Factor Scaler

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 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.
Operating Principle

What is a k-factor? Every turbine flow meter has a unique k-factor, or ratio of input pulses per unit of flow. As the turbine rotates within the flow meter an electronic pulse is created each time a turbine blade passes the face of the magnet. The total number of pulses equivalent to one unit of flow is the k-factor. For a Blancett turbine meter, the k-factor is the number of pulses equivalent to

1 gallon, and every flow meter is labeled with its unique k-factor. Because this k-factor applies only to gallons, the k-factor scaler is a low-cost and convenient way to convert the turbine output into a different frequency, representing a different unit of measure. See Figure 1.

Example: (Highlighted in yellow)

  1. Blancett turbine flow meter has a k-factor of 870. but PLC is configured for one pulse per cubic meter
  2. Enter 229855 into k-factor scaler
  3. Now, the frequency output of the meter has been converted to correspond with cubic meters instead of gallons, and the square wave output is compatible with the PLC.

Note: Divisors for other units of measure are based on volumetric conversions and are provided in the operating manual. For signal amplification only, set the k-factor sealer to 1.

Models
Blancett offers two versions of the k-factor sealer: switch-selectable (Model B220-880 or B220-881) and 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. The programmable version comes pre­calibrated 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 2.
 
Specifications

Operating Temperature:

-22 °F (-30 °C) to 158 °F (70 °C)

Inputs:

Magnetic Pickup

Frequency Range

0 to 4000 Hz

Trigger Sensitivity

30 mV p-p to 30 V p-p

Output Signal:

 

Max Voltage

30 Vdc

Max Power

0.25 W

Pulse Type

 

using internal pull-up resistor

VH = Power input voltage - 0.7 Vdc

 

VL = Less than 0.4 V @ max input power

using external pull-up resistor

VH = Input voltage to external pull-up resistor

 

VC= (VH / Selected resistor value + 47Ω ) • 47Ω

Pulse Length:

150us. 1 ms, 25ms, 100ms, 500ms, 1s, or auto mode selectable

Internal Pull-up

Jumper disable option

Resistor:

3.6K Ω

Enclosure Ratings:

 

Model B220-885

Killark aluminum-capped elbow - Y3 CSA approved Class I, Div 1 & 2,

 

Groups C, D; Class II, Div 1 & 2, Groups E, F and G: and Class III

Models 8220-880

Appleton GR conduit outlet box GRL100-A & GRLB1 ODA, CSA

& B220-881

approved Class I, Groups B, C & D: Class II,

 

Groups E. F and G; & Class III

Certifications:

CSA ordinary locations

 

Pollution Degree 2, Overvoltage Category III

 
Features:
Models B220-880 B220-881 B220-885
K-factor X X X
No. of Digits 8 8 9
Range 1 to 99,999,999 1 to 99,999,999 1 to 99,999,999
K-Factor Entry Rotary Switch Rotary Switch Electronic Input
 
Model B220-880 Model B220-881 Model B220-885

 

 
 
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