Mass Flow Computers

Liquid Flow Computer with Temperature Compensation

Our flow computers / totalizers measure volume flow rate and total of liquids. Some liquids ( eg. alcohol or spirit ) which expand or contract significantly in the operating temperature range. 

For these liquids , change in liquid Temperature causes variations in volume which cannot be ignored, especially for custody transfer applications. So the volume is required to be compensated for changes in Temperature. 

Our Flow computer for liquids computes the volumetric flow and total referenced to any standard temperature whose value is programmable.

It is available for any flow input such as 4-20mA analog signal from Electromagnetic flow meter .It can transmit compensated flow or total as 4-20mA analog signal . Communication option is available as Industry standard RS485 or RS232 MODBUS.
 

Our Flow Computer SFC-146 is designed for steam flow measurement. This versatile flow meter computes compensated steam flow receiving input from

• Vortex flow meter, from volumetric flow
• Orifice plate , ISO 5167 computation
• Venturi  & verabar computations.

this flow computer can easily be interfaced to scada or dcs systems as various options like analog retransmission and rs485-modbus outputs are available.

salient features

Multi-parameter display

•  volumetric flow
•  mass flow
•  steam pressure
•  steam temperature
•  steam density
•  saturation pressure
•  mass total
•  enthalpy
•  specific energy
•  energy flow

Built-in steam table iapws-1997 algorithm, real-time calculation of compensated mass flow and other steam parameters.

• Saturated steam using pressure or temperature inputs (analog 4-20ma ).
• Superheated steam using both analog 4-20ma pressure or temperature inputs (analog 4-20ma ).

Preset temperature or pressure values can be programmed in case on-line signals are not available or transmitter failure.

Saturated or Superheated steam can be selected from an option menu, and there is a warning when no superheat is present in the steam.

Two levels of passwords, one for the user and another for instrument configuration to avoid un-authorised tampering.

Non-volatile memory to retain totalised flow, no batteries to change or fail.

Isolated retransmission 4-20ma analog output signal.  

Isolated RS485/RS232 MODBUS communication for reliable connectivity.

Working principle of a Gas Flow Computer We know that real or compressible gases expand with rising temperature, and compress with rising pressure and vice versa. This means that the same mass of gas will have  different volumes at different sets of Temperature and Pressure conditions. In other words, the density of such Gases is heavily dependent on the Pressure and Temperature. Therefore just Volumetric flow measurement is not suitable for such gases. It is a must to monitor the Mass Flow. Alternatively, the actual Volumetric Flow for gases is often represented as "Normalised" or "corrected" to standard pressure and temperature conditions.Mostly measured in Nm3/hr or SCFM , this is the volumetric flow of the mass flow had the gas been flowing at "standard" or "normal" Temperature and Pressure conditions ( STP / NTP)

The above mentioned change in gas density is a complex mathematical function of Temperature, Pressure and the physical and chemical properties of the Gas.

GFC-147...the perfect solution to your Gas Flow measurement needs
Sometimes referred to as EFM ( Electronic Flow Meter) or Mass Flow Computer ( MFM) , our Gas Flow Computer GFC-147 has an internal database of physical properties of most commonly used industrial gases/It measures Gas Pressure and Temperature , and uses extremely complex algorithms for calculations of Gas Density & Compressibility... all in real time.

It also uses algorithms confirming to International standards like ISO 5167 to compute Flow from Orifice Plates, Venturis, Flow Nozzles, Pitot Tubes etc. and corrects for factors like Reynolds number when the flow is computed.  
So, it can be connected to any of these standard Flow measuring systems such as:

• Vortex Flowmeter
• Orifice Plate, DPT 
• Pitot Tube, Venturi ,'Verabar' etc.

The Flow Computer can easily be interfaced to SCADA or DCS systems as various options like Analog Retransmission and RS485-MODBUS outputs are available.

Salient Features

Extensive Database of gases

• Compressed Air
• Ammonia
• Iso-Butane
• N-Butane
• CO2
• CO
• Chlorine
• Ethane
• Ethylene
• Helium
• Hydrogen
• Methane
• Nitrogen
• Oxygen
• Propane
• Propylene
• Argon
• LPG

Please do contact us even if your gas is not included in the above database. 
Multi-parameter Display- 

• Volumetric Flow
• Mass Flow
• Gas Pressure
• Gas Temperature
• Gas Density
• Compressibility
• Mass Total
• Normalised Flow
• Normalised Total

Preset Temperature or Pressure values
The values of Temperature and Pressure can be programmed in case on-line signals are not available or a transmitter failure.

Two levels of passwords,
One for the user and another for instrument configuration to avoid un-authorised tampering.
Non-volatile memory to retain Totalised Flow, no batteries to change or fail.
Isolated Retransmission 4-20ma analog output , can be dedicated to represent any variable. 
Isolated RS485/RS232 MODBUS interface  Graphical Trend for Flow