Campbell HMP 35A Manuel d'instructions télécharger pdf (Page 20)

HMP155ATemperature and Relative Humidity Probe

Connections to CRBasic dataloggers are given in TABLE 7-1 and TABLE 7-2.

To wire an Edlog datalogger, see an older manual at

www.campbellsci.com/old-manuals, or contact a Campbell Scientific

application engineer for assistance.

When measuring the HMP155A with single-ended

measurements, the white and black leads must both be

connected to

. Doing otherwise will connect the

datalogger’s analog and power ground planes to each other,

which in some cases can cause offsets on low-level analog

measurements. To avoid 3 mA flowing into analog ground,

switch the sensor on/off for its own measurement.

TABLE 7-1. Connections for Single-Ended Measurements

Color

Wire Label

CR6

CR9000X

CR1000,

CR3000,

CR800,

CR5000

CR200(X)

Yellow Temp Signal Single-Ended Input Single-Ended Input

Blue RH Signal Single-Ended Input Single-Ended Input

White Signal Reference

Black Signal Ground

Clear Shield

Red Power SW12V SW12V SW Power

TABLE 7-2. Connections for Differential Measurements

Color

Wire Label or

Description

CR6

CR1000,

CR3000,

CR800,

CR5000,

CR9000X

Yellow Temp Signal Differential Input – H

Jumper to White Differential Input – L

Blue RH Signal Differential Input – H

White Signal Reference Differential Input – L

Black Signal Ground G

Clear Shield

Red Power SW12V 12V/SW12V

CAUTION

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 43 44

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Campbell HMP 35A Manuel d'instructions Page 20

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