Sensor temeperatura aanderaa

Páginas: 3 (582 palabras) Publicado: 17 de septiembre de 2012
Air Temperature Sensor 3455/3455 EX

D276-December 2006

A platinum sensor for air temperature measurements.

Datalogger 3660

Automatic Weather Station AWS 2700

High-accuracy airtemperature measurements are very often required and this sensor is especially designed for this
purpose. The sensor has many applications both indoors and
outdoors and it is one of several atmosphericsensors made
by Aanderaa Data Instruments. The sensor is furnished with
a standard Aanderaa sensor foot that plugs directly onto the
sensor cross-arm of the Automatic Weather Station 2700 or,
it canbe fastened to a 25 mm aluminum tube.
The 80 mm long sensor is cylindrically shaped and built up
on a 6-pin watertight receptacle. The sensor element is embedded in a small tube with cooling ribs.The wires and range
resistors are molded in Durotong which forms the center part
of the sensor. This construction ensures good thermal insulation between the sensor element, the receptacle and theconnecting cable. The sensor is equipped with a radiation screen

that will hinder heating of the sensor by direct sunshine in wind
velocities as low as 0.5m/s.
The sensor is based on the ohmichalf-bridge principle (VR-22)
and employs a 2000Ω film-type platinum resistor as the sensing
element. Three ranges are available; –43 to +48°C, –30 to
+60°C and –60 to +30°C.
Separate sensor cables, ofup to 500 meters can be used.
When using cables longer than 150 meters however, the
wire resistance must be corrected for (see overleaf).
Air stretch of cables exceeding 10 meters in length mustbe
avoided. It is recommended to keep the cable as close to the
ground as possible to avoid pick-up of atmospheric electricity.

Reliable Solutions 1

Specifications for 3455/3455 EX
MeasuringRange:

OD 60 mm
Radiation Screen
3446
Temperature sensor
PT-element

Sensing Element:
Range Resistors:

Durotong
Range Resistors

122.5
mm

Nut for probe
Screen base
O-ring
6-pin...
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