Vaisala HMT360N - Manual (Page 40)

User's Guide ______________________________________________________________________
38 __________________________________________________________________ M210744EN-C
From these facts the following equation can be formed:
U
drop
= R
cabletot
× I
out
2 = 2 × 0.085
/m × l
max
× 20 mA
l
max
= 2 V / (20 mA Ч 2 Ч 0.085
/m)
l
max
= 588 m = 1930 ft, maximum cable length.
HMT360 Connected to a Galvanic Isolator
0505-278
NOTE If longer cable length is required, use of the galvanic isolators is
recommended if possible.
HAZARDOUS AREA SAFE AREA
a) current signal controller
I