Vaisala Drycap DMT152, User Manual

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Table 23 XPUR command
Syntax Description
XPUR [ON/OFF]
<cr>
ON
= Enable sensor purge
OFF = Disable sensor purge
Example:
xpur off
Purge : OFF
After giving the XPUR OFF command, the transmitter will not perform a 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
5.5.2 Set Pressure Value for ppm Calculation
The DRYCAP 180U sensor in DMT152 is not pressure-dependent. When measuring dew point,
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.
Table 24 PRES and XPRES command
Syntax Description
PRES [pp.pppp]
<cr>
[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.
XPRES [pp.pppp] <cr> [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.
Use the XPRES command 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 value is set to
0, the last value set with PRES is used instead.
The minimum valid pressure value for both the PRES and XPRES commands is 0.1 bar
a
.
Example:
pres 1.01325
Pressure : 1.01325 bar
DMT152 User Guide M210865EN-J
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