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 Redlich-Kwong Soave-Redlich-Kwong Peng-Robinson
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.
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.
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.
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.
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