Vaisala PTU300 Guía de usuario Pagina 44

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USER'S GUIDE____________________________________________________________________
42 __________________________________________________________________ M210796EN-E
NOTE
Please do not attach a heated probe (PTU307) to metal structures to
avoid condensation problems caused by heat conduction along the metal.
If the process temperature is much higher than that of the environment,
the whole probe and preferably plenty of cable must be inside the
process. This prevents measuring inaccuracy caused by heat conduction
along the cable.
When mounted on the side of a duct or channel, the probe must be
inserted from the side of the duct. If this is not possible and the probe
must be inserted from the top, the point of entry must be carefully
insulated.
For Vaisala probe installation kits and some installation examples see
Appendix A on page 171.
PTU303 for General Use
The PTU303 is a small size (d=12mm) probe for general use, up to
+80 °C (+176 °F). The probe is suitable for weather stations,
environmental compensations, laser interferometers and test benches. It
is suitable for ducts and channels with the installation kit available from
Vaisala.
The PTU303 provides for two measuring range options. The first probe
version is equipped with a flexible cable and can be used when
measuring in environments up to 80 ºC. The second version is suitable
for measuring in environments up to 120 ºC.
See Appendix A on page 171 for the following probe installation kits for
PTU303 and installation examples.
-
Duct mounting kit
- Cable gland.
PTU307 for High Humidities
The PTU307 is for environment where relative humidity is very high,
near saturation. The warmed probe prevents the saturation of the sensor.
An additional temperature probe is also available.
The PTU307 RH+T probe is suitable for temperatures up to +180°C
(+356°F). Note that the operational temperature limit for the PTU307
probe is higher than for the PTU300 transmitter itself. The upper
temperature limit for barometric pressure measurement is +60°C (140°F).
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