Wilkerson Instrument Co. Homepage A World of Signal Conditioning & Process Control Instrumentation Products


WM0075 X 2
3/4 Inch X 2 Inch
Wafer Style
Liquid Turbine Flow Meter

 

SPECIFICATIONS

End Connection Size

Flow Ranges

 Accuracy/ Repeatability Retro-Fit
Kit
GPM BPD M3PD LPM
3/4"x2" 2 - 15 68 - 514 11 - 80 7.57 - 56.78 +/- 1.0 %
   +/- 0.10%		 WWK0075 X 2

FEATURES

bullet Magnetic Pick-up (standard service) is included with each turbine flow meter at no extra charge.
bullet Standard Service Temperature Range: -100 to +300 F. (-74 to +149 C)
bullet Maximum service pressure for the wafer style meter is 3700 psi. Up to this limit, service pressure is set by the flanges. (See Table Below)

 

ANSI
flange size

Working Pressure
in PSI

Carbon Steel

Stainless Steel

CL-150

285

230

CL-300

740

600

CL-600

1,480

1,200

CL-900

2,200

1,800

CL-1500

3,705

3,000

 

Materials of Construction

bulletMeter Body:      316 Stainless Steel 
bulletRotor Supports:  316 Stainless Steel
bulletMeter Rotor:     416 Stainless Steel
bulletRotor Shaft:     Tungsten Carbide
bulletSleeve Bearing:  Tungsten Carbide

Operating Principle

The operating principle of the turbine flow meter is simple and straightforward. The meter consists of a precisely machined cylindrical body that serves as a conduit for the line fluid to be metered. Into this flow stream a specially designed and machined rotor is suspended axially by means of rotor supports and specially designed bearings (dependent on line fluid composition). The flowing line fluid causes the rotor to revolve at a rate that is directly proportional to the velocity of the line fluid. A pick-up coil (typically magnetic) is positioned externally in direct opposition to the location of the rotor, and perpendicular to the axis of rotation. The rotation of the rotor through the magnetic field causes electrical pulses that are "picked up" by the magnetic pick up and conducted to the secondary device (flow monitor, totalizer/indicator, SCADA system, etc.)

In this fashion, the number of pulses caused by the turbine flow meter defines a specific and unique flow rate. A properly designed and manufactured turbine flow meter will always produce the same number of pulses as a function of time for a given unique flow rate within the flow range of the meter, subject to the stated accuracy and repeatability.

Each individual turbine flow meter has a distinctive k-factor that defines the actual number of pulses per actual unit volume of line fluid. This factor may be different for each physical embodiment of the turbine meter, and must be experimentally determined in order to yield the stated accuracy and repeatability of the meter.

A unique k-factor is established by means of NIST traceable factory calibration. This k-factor is then used to set the flow monitor to provide accurate and reliable readings.

Turbine Flow Meter Installation

The WM Series of liquid turbine flow meters provides +/- 1.00% standard accuracy, and is repeatable to +/- 0.10% over the entire flow range.

In order to assure this performance, it is necessary to install the turbine flow meter with adequate upstream and downstream straight piping, and the device must not be exposed to sudden acceleration (deceleration) nor may a liquid turbine flow meter be exposed to air (or gas flow) since so doing may cause bearings to wear prematurely due to lack of lubrication and excessive speed.

Retro-Fit Kits

The nature of the turbine flow meter dictates that after a period of service, the inevitable wear on the rotor blade demands that the rotors be replaced to maintain accuracy. A complete line of Retro-Fit Kits that are easily field installed are available. The kit includes the rotor, rotor supports, bearings and shaft, as well as the retaining rings.

Our kits are extremely cost effective, and they also fit into the bodies of most competitors’ turbine flow meters.