FlowControllerDriverBase

class FlowControllerDriverBase

Bases: ABC

Vendor flow-controller driver contract. Concrete drivers own their transport and lifecycle.

Attributes

mass_flow	Current mass flow reading.
pressure	Current pressure reading.
process_value	Current process value (primary feedback measurement for control).
process_value_source	Key constant (e.g. MASS_FLOW_KEY, VOLUMETRIC_FLOW_KEY, PRESSURE_KEY) indicating which measurement is the process value.
setpoint	Current setpoint in the device's configured engineering units.
volumetric_flow	Current volumetric flow reading.

Methods

close	Close the underlying transport.
get_flow_data	Read a full measurement frame from the device.
open	Open the underlying transport.
select_working_fluid	Select the active working fluid by name; driver resolves the device-internal identifier.
set_setpoint	Command a new flow setpoint in the device's configured engineering units.
tare_flow	Zero the flow reading.

abstractmethod open() → None

Open the underlying transport.

abstractmethod close() → None

Close the underlying transport. Idempotent.

abstractmethod get_flow_data() → FlowData

Read a full measurement frame from the device.

abstractmethod set_setpoint(setpt: float) → float

Command a new flow setpoint in the device’s configured engineering units.

abstractmethod select_working_fluid(fluid_name: str) → str

Select the active working fluid by name; driver resolves the device-internal identifier.

tare_flow() → FlowData

Zero the flow reading. Device must have zero flow when called. Raises NotImplementedError if controller does not support taring.

abstract property setpoint: float

Current setpoint in the device’s configured engineering units. Required for all controller types.

property mass_flow: float

Current mass flow reading. Raises NotImplementedError if controller does not measure mass flow.

property volumetric_flow: float

Current volumetric flow reading. Raises NotImplementedError if controller does not measure volumetric flow.

property pressure: float

Current pressure reading. Raises NotImplementedError if controller does not measure pressure.

abstract property process_value: float

Current process value (primary feedback measurement for control). Each controller variant returns its primary measured value.

abstract property process_value_source: str

Key constant (e.g. MASS_FLOW_KEY, VOLUMETRIC_FLOW_KEY, PRESSURE_KEY) indicating which measurement is the process value.