Campbell HMP45C Guide de l'utilisateur télécharger pdf (Page 15)

User Guide

Table 3. Power Connections using PSW12 Peripherals

HMP45C PSW12 Peripheral Datalogger

Description Colour Terminal

Wire

Power Red 12V Red 12V

Power Ground Black G Black* See tables

1 & 2

Yellow Control Port

*The black wire of the PSW12 should be connected to the type of datalogger

ground channel recommended for the HMP45C black wire as listed in Table 1

and 2.

5. Example Programs

This section is for users who write their own datalogger programs. A datalogger

program to measure this sensor can be created using Campbell Scientific’s Short

Cut Program Builder software. You do not need to read this section to use Short

Cut.

The temperature and relative humidity signals from the HMP45C can be

measured using a single-ended analogue measurement or a differential analogue

measurement.

Use a single-ended analogue measurement when the HMP45C signal lead length

is less than 6.1 m (20 ft.) or if the probe will be turned on and off under

datalogger control between measurements. For lead lengths greater than 6.1 m

(20 ft.) or when the probe will be continuously powered, use a differential

analogue measurement. For a discussion on errors caused by long lead lengths

see Section 6.

The HMP45C output scale is 0 to 1000 millivolts for the temperature range of

-40°C to +60°C and for the relative humidity range of 0 to 100%. Tables 4 and 5

provide calibration information for temperature and relative humidity.

Table 4. Calibration for Temperature

Units Multiplier

(degrees mV

-1

)

Offset

(degrees)

Celsius 0.1 -40

Fahrenheit 0.18 -40

Table 5. Calibration for Relative Humidity

Units Multiplier

(% mV

-1

)

Offset

(%)

Percent 0.1 0

Fraction 0.001 0

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 27 28

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Campbell HMP45C Guide de l'utilisateur Page 15

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