Contrec 515 – GC01

Gas Flow Controller - Quadrature Input

The 515 GC01 Gas Flow Controller measures the volume, corrected volume and mass of a general gas.

The instrument uses a frequency volume flow input and analog temperature and pressure sensor inputs.

The 515 – GC01 Gas Flow Controller is compatible with a wide range of flowmeter frequency outputs. Millivolt signals, reed switches, Namur proximity switches or pulse trains can be selected via its smart front-panel programming.

The properties of gas are calculated using common industry standard equations of state. These equations use a simplified set of parameters to quickly and accurately determine the value of compressibility and actual quantity of gas.


A variety of calculations are available to suit the nature of the gas and the measurement conditions. The calculations are valid for the vapour phase of gas.

Equations of state:

Ideal Gas

Displayed Information

The front panel display shows the current values of the
input variables and the results of the calculations. A list of
the variables for this application and their type (total or
rate) is shown at the end of this document.
The instrument can be supplied with a real-time clock for
data logging of over 1000 entries of the variables as
displayed on the main menu.


There are two communication ports available as follows:
• RS-232 port
• RS-485 port (optional)
The ports can be used for remote data reading, printouts and for initial application loading of the instrument.

Isolated Outputs

The opto-isolated outputs can re-transmit any main menu
variable. The type of output is determined by the nature of
the assigned variable. Totals are output as pulses and
rates are output as 4-20 mA signals. One output is
standard, a second output is available as an option.

Relay Outputs

The relay alarms can be assigned to any of the main menu variables of a rate type. The alarms can be fully configured
including hysteresis. Two relays are standard with additional two relays available as an option.

Software Configuration

The instrument can be further tailored to suit specific application needs including units of measurement, custom
tags, second language or access levels. A distributor can configure these requirements before delivery.
Instrument parameters including units of measurement can be programmed in the field, according to the user
access levels assigned to parameters by the distributor.

For more information on Contrec Flow Controllers, Click Here