Vaisala HUMICAP HMP41 Spécifications télécharger pdf (Page 14)

Model HMP45C Temperature and Relative Humidity Probe

Ω/1000 feet, or 13.9 Ω/1000 feet. Using Ohm’s law, the voltage drop (V

along the signal reference/power ground, is given by Eq. (1).

ft 1000 mV 6.55

ft 1000 9.13 mA 4

Ω∗=

∗= RI

(1)

This voltage drop will raise the apparent temperature and relative humidity

because the difference between the signal and signal reference lead, at the

datalogger, has increased by V

. The approximate error in temperature and

relative humidity is 0.56°C and 0.56% per 100 feet of cable length,

respectively.

TABLE 6-1. Wiring for

Differential Measurement Examples

Color Description CR1000 CR10(X)

Yellow Temperature 2H 2H

Jumper to 1L 2L 2L

Blue Relative Humidity 1H 1H

White Signal Reference 1L 1L

Jumper from SW12V

Control

Red Power SW12 V SW12 V

Black Power Ground G G

Clear Shield

CR1000 Program using Differential Measurement Instructions Using SW12V on Datalogger

'CR1000 program to measure HMP45C with differential measurements

Public AirTC

Public RH

DataTable(Temp_RH,True,-1)

DataInterval(0,60,Min,0)

Average(1,AirTC,IEEE4,0)

Sample(1,RH,IEEE4)

EndTable

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 23 24

Pas de commentaire

Vaisala HUMICAP HMP41 Spécifications Page 14