Vaisala HMT360Series Uživatelská příručka stáhnout pdf (Strana 39)

Chapter 3 _______________________________________________________________ Installation

VAISALA_______________________________________________________________________ 37

Maximum Cable Resistance Calculation for the

Barrier (Vaisala Order Code: 210664)

Calculation of the maximum cable length from barrier to transmitter:

General specifications of HMT360:

Supply voltage U

= 24 V (12 ... 35 V)

Maximum current I

out

= 20 mA

Minimum operating voltage for

HMT360

min

= 12 V (15 V with serial port)

Stahl 9001/51-280-091-141 (values taken from the specifications):

Rated operating voltage U

= 20 ... 35 V

Transmitter supply voltage U

= U

- 9.5 V, when

≤ 23.5 V

or U

= 14 V, when U

≥ 23.5 V

Maximum load R

≤ 350 Ω

Cable resistance (as an example) R

cable

= 0.085 Ω/m/core (2 ×

0.085 Ω/m/pair)

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 96 97

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Vaisala HMT360Series Uživatelská příručka Strana 39