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HMP45C Temperature and RH Probe

2.1 Temperature Sensor

Sensor: 1000 Ω PRT, IEC 751 1/3 Class B

Temperature Measurement Range: -40°C to +60°C

Temperature Output Signal range: 0.008 to 1.0 V

Temperature Accuracy:

0.4

0.2

0.0

-0.2

-0.4

-40 -20

Temperature ( C)

Error ( C)

0 20 40 60

2.2 Relative Humidity Sensor

Sensor: HUMICAP

180

Relative Humidity Measurement Range: 0 to 100% non-condensing

RH Output Signal Range: 0.008 to 1 VDC

Accuracy at 20°C

±2% RH (0 to 90% Relative Humidity)

±3% RH (90 to 100% Relative Humidity)

Temperature Dependence of Relative Humidity Measurement: ±0.05% RH/°C

Typical Long Term Stability: Better than 1% RH per year

Response Time (at 20°C, 90% response): 15 seconds with membrane filter

3. Installation

The HMP45C must be housed inside a radiation shield when used in the field.

The MET21, URS1 (Figure 1) or 41003-5 Radiation Shield (Figure 1 and 2)

mounts to a tripod mast, UT930 ATW tower leg.

A standard lead length of 3 m allows the HMP45C to be mounted at a 2 or 3 m

height on a tripod mast or tower leg.

The black outer jacket of the cable is Santoprene

rubber. This

compound was chosen for its resistance to temperature extremes,

moisture, and UV degradation. However, this jacket will support

combustion in air. It is rated as slow burning when tested

according to U.L. 94 H.B. and will pass FMVSS302. Local fire

codes may preclude its use inside buildings.

With the exception of the URS1 (see below) the probe should be installed so the

tip of the probe is positioned in the middle of the shield, relative to top and

bottom plates of the shield.

NOTE

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Campbell HMP45C Guida Utente Pagina 10

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