AlicatMC#

class AlicatMC( visa_resource: str | VisaConfig, device_id: str = 'A', )[source]#

Bases: FlowControllerDriverBase

Alicat MC-series mass-flow controller (MC-100SCCM and related MC models).

Communicates in RS-232 polling mode. device_id is the single-letter address (A–Z) configured on the device; default is "A". Default baud is 19200 with 8data-1stop-none_parity-none_flow Termination is always carriage return.

Attributes

`GAS_KEY`
`mass_flow`	Current mass flow reading in the device's configured engineering units.
`pressure`	Current absolute pressure reading in the device's configured engineering units.
`process_value`	Current process value.
`process_value_source`	Key constant for the process value measurement.
`setpoint`	Current setpoint in the device's configured engineering units.
`volumetric_flow`	Current volumetric flow reading in the device's configured engineering units.
`unit_id`
`known_gas_types`
`measurement_headings`

Methods

`cancel_valve_hold`	Release any active valve hold and return to normal setpoint control.
`close`	Close the VISA transport.
`define_gas_mixture`	Allows defining an arbitrary gas mixture of 2-5 components.
`get_flow_data`	Poll the device for a single measurement frame.
`get_flow_sample_metadata`	Return measurement field descriptors; cached after first call unless refresh=True.
`hold_valve_at_position`	Hold the valve at its current position.
`hold_valve_closed`	Hold the valve closed.
`list_gas_types`	Return all gas types the device supports; cached after first call unless refresh=True.
`open`	Open the VISA transport.
`select_working_fluid`	Select the active working fluid (gas) by name and return the confirmed fluid name.
`set_loop_control_variable`	Set the loop control variable (process value source) and update the cache.
`set_setpoint`	Command a float setpoint in the device's configured engineering units.
`set_setpoint_int`	Command a setpoint using integer encoding for the given full-scale range and minimum.
`tare_barometer`	Zero the barometer reading; device must support barometer tare.
`tare_flow`	Zero the flow reading; device must have zero flow and must support tare.