Compact Orifice Mass Flow

The Compact Orifice Mass Flow meter

Benefits

• Sizes ranging from DN 40 (1½") up to DN 400 (16").
• Standardised product based on well proven and widely accepted technology.
• No moving parts. Not sensitive to vibrations. Compact design. Easy to install. High accuracy.

Typical Applications

The Compact Orifice Mass Flow meters measure the mass flow of most liquids and gases within the process industries, including chemical, petro-chemical, pharmaceutical and the power industry. The Compact Orifice Mass Flow is based on the principle of measuring velocity, the static pressure and the temperature in the pipe line. The electronics computerise the mass flow by using the 3 measured values. The Compact Orifice Mass Flow flow meters are backed by international standards covering flow calculation, manufacturing tolerances, accuracy and installation requirements. This type of bare bone technology is accepted world wide and supported by millions of successful installations.

The Compact Orifice Mass Flow meter features are:

• Standardised product based on well proven technology.
• Compact design.
• Simple construction.
• Free choice for horizontal or vertical pipe run.
• Standardised construction means low inventory.
• No moving parts.
• Not sensitive to vibrations.
• The electronics delivers output signal linear to mass flow.
• Digital indicator for local mass flow reading.
• High accuracy.
• Wide rangeability.
• Easy to install.
• Easy to re-calibrate.
• Full PED compliance PED 97/23 EC

Construction

Accessories

Remote Mounting Kit type RMK is available if remote mounting of electronics is required in case of difficulty accessing pipeline or if there are elevated process temperatures.
The customer has to provide the stainless steel instrument tube Ø 12 x 1 mm between flow meter and electronics. Remote electronic indicator witd LCD is available for local flow indication and if required check/change of flow rate (differential pressure).

Principle of Measurement

The Compact Orifice Mass Flow is a mass flow meter
A restriction in a pipe line changes the value of the different energies.
Based on the law of energy balance developed by Bernoulli the sum of energies remains constant.
Increases the velocity in the pipe line decreases the pressure in the restriction.
The pressure differential between the inlet pressure and the pressure in the restriction is measured and expressed as the flow velocity.
The static pressure and the temperature is measured.
When the physical values of the fluid is known and the inner pipe diameter is established the electronics calculate the mass flow. The mass flow is expressed in an analogue signal 4 - 20 mA or signal for digital communication.

Technical Data

• Sizes : DN 40 - DN 400, 11⁄2" - 16", larger sizes on request
• Pressure rating : up to PN 40, 300 lbs, higher pressure ratings on request
• Temperature : Process : -50 - +150°C,
• higher temperature witd Remote Mounting Kit
• Mounting style : Between flanges according to DIN or ANSI standards
• Flange facing : flat face (standard), raised face, DIN 2512 N, DIN 2513 R
• Overall lengtd : 120 mm
• Material : Stainless steel AISI 316, others on request
• Design and calculation standards : ISO 5167, ASME MFC-3M.
• Vent or drain hole : On request
• β (d/D) : 0,5 and 0,6; other β on request.
• Accuracy : +/- 1 %
• Rangeability : 8:1
• Repeatability : better tdan 0,1 %
• Pressure loss : typical 150 mbar for liquid flow, and 50 mbar for gas flow (values are given at full flow)
• Reynolds No : Re > 5000
• Allowable differential pressure : max 2,5 bar
• Output signal : analogue 4 - 20 mA or Digital communication via protocol, HART, PROFIBUS, Fieldbus Foundation or others.
• Local indicator (option): LCD showing flowing units or %
• Power supply : 14 - 36 Vdc, typical 24 Vdc.
• Max load (24 Vdc) : 700 Ohm
• Enclosure : IP 67
• Ex protection : intrinsically safe EEx ia IIC T6,Explosion proof EEx d IIC T6
• Temperature : Ambient : -40 - +80°C

Sizes

DIN Flanges

ANSI flanges

Overall dimensions

Installation Requirements

The Compact Orifice Mass Flow meter can be mounted in a horizontal or vertical pipe. For liquid flow in a horizontal pipe the electronics shall be mounted below the pipe. For gas flow in a horizontal pipe the electronics shall be mounted above the pipe. To insure high accuracy of measurement, long straight pipe runs up-stream from the flow meter is necessary. The required straight pipe run depends on the disturbance upstream. To maintain the 1% accuracy the minimum straight pipe run upstream shall be 14 x inner pipe diameter and 6 x downstream If an additional inaccuracy of 1⁄2 % is acceptable the required straight pipe runs are reduced to half of the above values.

Typical Applications

Fast and easy installation in liquid and gas lines requiring minimal interruption for calibration.

Works with:-

Differential pressure transmitters:-IDP10; IDP15; IDP25; IDP31; IDP50
And all our Absolute Pressure and Gauge Pressure transmitters, Temperature sensors and mass flow computers.
MultiVariable Transmitters :- IMV25, IMV30

Supplied by DP-Flow