Vaisala DMT152 - Manual (Page 48)

User's Guide _______________________________________________________________________
46 ___________________________________________________________________ M210865EN-F
Configuring Measurement Parameters
Enable or Disable Sensor Purge
You can temporarily disable the sensor purge function using the XPUR
command. Note that disabling the sensor purge will affect the
measurement performance of the transmitter.
XPUR [ON/OFF]
Example:
xpur off
Purge : OFF
After giving the XPUR OFF command, the transmitter will not perform
sensor purge until one of the following events takes place:
- Transmitter is reset or powered up
- Sensor purge is enabled using the XPUR ON command
Set Pressure Value for ppm Calculation
The DRYCAP
®
180U sensor in the DMT152 is not pressure-dependent.
When measuring dewpoint, pressure compensation is not needed.
However, in the calculation of ppm volume concentration, the pressure of
the system must be known. If you did not specify pressure compensation
when ordering the product, use the commands below to enable the
pressure compensation and set the pressure value.
PRES [pp.pppp]
XPRES [pp.pppp]
where
pp.pppp = Absolute pressure in the measuring point. The unit is
bar
a
if metric units have been selected, and psi
a
if
non-metric units are used.
Command XPRES should be used if the value is changed frequently.
The value set using the XPRES command overrides the PRES value, but
it is not retained at reset. When the XPRES is set to 0, the last value set
with PRES is used instead.
Example:
pres 1.01325
Pressure : 1.01325 bar