Campbell HMP 35A Manuel d'instructions télécharger pdf (Page 19)

HMP155A Temperature and Relative Humidity Probe

6.2 Relative Humidity Sensor

Measurement range: 0 to 100% RH

Accuracy (including non-linearity,

hysteresis and repeatability)

at 15 to 25 °C (59 to 77 °F): ±1% RH (0 to 90% RH)

±1.7% RH (90 to 100% RH)

at –20 to 40 °C (–4 to 104 °F): ± (1.0 + 0.008 × reading) % RH

at –40 to –20 °C (–40 to –4 °F): ± (1.2 + 0.012 × reading) % RH

at 40 to 60 °C (104 to 140 °F): ± (1.2 + 0.012 × reading) % RH

at –60 to –40 °C (–76 to –40 °F): ± (1.4 + 0.032 × reading) % RH

Factory calibration uncertainty (20 °C): ±0.6% RH (0 to 40% RH)

±1.0% RH (40 to 97% RH)

(Defined as ±2 standard deviation

limits. Small variations possible,

see also calibration certificate.)

Humidity sensor: HUMICAP®180R

Response time for HUMICAP®180R(C)

at 20°C in still air with sintered PTFE

filter and a 0% to 75% RH step change: 20 s (63% step change);

60 s (90% step change)

7. Installation

If you are programming your datalogger with Short Cut, skip Section 7.2,

Wiring, and Section 7.3, Datalogger Programming. Short Cut does this work

for you. See Section 4, Quickstart, for a Short Cut tutorial.

7.1 Siting

Sensors should be located over an open level area at least 9 m (EPA) in

diameter. The surface should be covered by short grass, or where grass does

not grow, the natural earth surface. Sensors should be located at a distance of

at least four times the height of any nearby obstruction, and at least 30 m

(EPA) from large paved areas. Sensors should be protected from thermal

radiation, and adequately ventilated.

Standard measurement heights:

1.5 m (AASC)

1.25 – 2.0 m (WMO)

2.0 m (EPA)

See Section 10 for a list of references that discuss temperature and relative

humidity sensors.

7.2 Wiring

The probe can be measured by two single-ended or differential analog input

channels (recommended for lead lengths > 6.1 m (20 ft.), see Section 7.4, Long

Lead Lengths). The CR200(X)-series dataloggers only have single-ended

channels.

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Campbell HMP 35A Manuel d'instructions Page 19

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