Command Set 25
Models 52xx Only
Denotes set gas calibration.
Denotes the gas calibration desired; range is 0, 1, 2, 6
0 = Air, 1 = 100% O
2
, 2 = 100% N
2
O, 6 = 100% N
2
.
The display will indicate the current gas calibration, either
air, O
2
, N
2,
or N
2
O.
NOTE: Only select gas calibration for gases in which the
meter is calibrated. Consult the user manual for
list of calibrated gases.
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 Appendix A for a list of possible error codes.
SUn
Select either standard or volumetric units of flow for data displayed on
the LCD display and for data received through the serial port.
Denotes whether flow is measured in standard units or
volumetric units.
Denotes which units.
S = standard flow rate, V = volumetric flow rate, U = User
conditions, UT = User temperature conditions, actual
pressure, UP = User pressure conditions, actual
temperature
This will control the units of measure for the gas reading over the
communications port. To change the units of measure shown on the
GUI screen, use the instrument’s touch screen (reference the user
manual).
The Series 53XX and 52XX flow meters are designed to measure
flow in units of standard L/min. When selecting volumetric flow rate,
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.
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