Flow Computers

415 Steam and Gas Flow Computer

Contrec Instruments

The 415 Steam and Gas Flow Computer incorporates the following compensation equations for gas and vapours:

Ideal Gas Law using temperature and pressure correction, but where compressibility correction is not required.

General Gases where compressibility is calculated using the Redlich-Kwong¹ state equation. This equation is suitable for gases which have known properties, and information on common industrial gases is provided in the operating manual.

Natural Gas using the NX-19² equation to calculate super compressibility.

Steam Equations for both saturated and superheated steam. Mass and energy flow rates are calculated using standard equations to determine the specific weight and enthalpy of steam.

  • Displays mass flow, corrected volume and energy flow
  • Accepts 4-20mA and frequency flow inputs
  • Temperature and pressure compensation
  • Dual ranged DP transmitter inputs
  • Operates from 14-28V dc or ac mains
  • Simplified programming
  • Data logging output



Contrec Instruments

Mass Flow measurement at a comparatively low cost can be achieved using the Model 405L and 414L instruments, an RTD temperature sensor and a volumetric flowmeter such as a turbine or positive displacement meter.

Volume correction to 15°C or 60°F for petroleum products is also possible. Petroleum tables and equations that comply with API/ASTM standards for metric and US units are included in both instruments.

With additional features such as a 10 point non-linearity correction and quadrature pulse input, the Models 405L and 414L are ideally suited to the precise measurement of flow, as required in custody transfer applications. The 405L Flow Computer displays Flow Rate, Resettable Total, Accumulated Total, Gross Total and Temperature.

The 414L Batch Controller displays Batch Total, Preset Quantity, Accumulated Total, Flow Rate, Gross Total and Temperature.

  • Mass Flow calculation
  • Volume Correction for petroleum products
  • Single and quadrature pulse inputs
  • Ticket printing option with time and date
  • General liquids
  • Petroleums
  • LPG
  • Custody Transfer
  • Truck Mounted

405 Flow Computer

Contrec Instruments

The 405 Flow Computer can handle a wide range of flow applications, where high accuracy and flexibility are required.

It will interface to most flowmeters and versions are available for pulse and analog inputs.

Either the Flow Rate or a Resettable Total can be continuously displayed in engineering units on the large six digit LCD display.

A non-resettable Accumulated Total is also displayed whenever the DISPLAY key is pressed.

A scaled pulse output, suitable for driving remote totalisers is a standard feature and the instrument also provides an 8-24 Volts dc power supply for driving transducers.

  • Large LCD display
  • Operates from 12-28V dc or ac mains
  • Scaled pulse output
  • Accepts 4-20mA and frequency flow inputs
  • Provides 8-24V dc transducer power
  • High accuracy
  • Self-adhesive engineering unit labels
  • Simplified programming
  • CE Compliant

212 Heat Calculator

Contrec Instruments

The 212 Heat Calculator is designed to measure the energy consumed in hot water heating systems and chilled water cooling systems.

The 212 is supplied complete with temperature probes and will interface with a wide range of flowmeters, including positive displacement and inferential water meters, magnetic flowmeters with pulse outputs, turbine and paddle wheel flowmeters.