pressure switch/sensor types

[blip2]

I've had a request for the following additions from within one of our design teams:
TDSW – switch - thermal dispersion flow proving switch
DPX – sensor – differential pressure sensor
LPS – switch – low pressure switch
HPS – switch – high pressure switch

couple of points for discussion here:

• do we want to differentiate between a pressure sensor and switch. I would argue yes, physically and logically these are different things, former provides an analogue value, latter is boolean
• do we want to differentiate between low/high pressure. I would argue no, they are physically the same thing (except maybe N/C or N/O arrangement)
• thermal dispersion flow proving switch is probably a fair addition though quite specific - any thoughts?

[blip2]

also:
SPSW - Static Pressure Switch

[RitaLav]

Generally we do have both sensors and switches on bdns.

Some suggestions:

For differential pressure sensor maybe follow the abbreviation logic of the differential pressure switch (eg we can call the sensor DPRS)

TDSW - should be ok if needed/useful for project teams

SPSW - ok

Could you do a pull request for DPRS, SPSW and TDSW?

@pisuke @jgunstone any thoughts on high/low pressure switch discussion point raised (generic vs low/high pressure switch)?

[RitaLav]

on the last point, it was discussed today. Please add a generic pressure switch - PSW or PRSW (rather than adding low and high)

[RitaLav]

Will add:
sensor - differential pressure sensor,DPS,SENSOR,IfcSensor,PRESSURESENSOR
switch - differential pressure,DPSW,,IfcSwitchingDevice,NOTDEFINED
switch - absolute pressure,APSW, ,IfcSwitchingDevice,NOTDEFINED
switch - static pressure,SPSW, ,IfcSwitchingDevice,NOTDEFINED
switch - thermal dispersion flow proving switch,TDSW, ,IfcSwitchingDevice,NOTDEFINED

We will also need to amend the existing dew point switch abbreviation from 'DPSW' to 'DEWSW' and modify its ifc class to IfcSwitchingDevice

[RitaLav]

Pull request #224 merged.