52
SUn
Select either Standard or Volumetric units of flow for data received
through the serial port.
SU Denotes whether flow is measured in Standard units or
Volumetric units.
n Denotes which units. S = Std L/min, V = Volumetric L/min.
The 4000 and 4100 series flowmeters are designed to measure flow
in units of standard L/min. When selecting volumetric L/min, they
perform a flow correction as shown below by measuring gas
temperature and pressure. Flow output in volumetric L/min is less
accurate due to additional uncertainties encountered when measuring
gas temperature and pressure.
=
Pm
Pstd
Tstd
Tm
*QFlowVolumetric
After the command is processed, an acknowledge sequence of “OK”
<CR> <LF> is sent. If the command generated an error instead of
“OK” <CR> <LF> being sent, an error code of “ERRn” <CR> <LF> will
be sent. See the end of this section for a list of possible error codes.
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