OleumTech H Series - Page 6

Page 6
DIFFERENTIAL PRESSURE TRANSMITTER - USER GUIDE
o. 4-20 mA Power Supply Voltage vs Loop Resistance
p. HART Multi-drop Minimum Power Supply Voltage
V min = 15.5 Vdc + 0.004 x N devices x (250 + Rloop)
Example: four devices with round loop resistance 20 ohm
V min = 15.5 + 0.004 x 4 x 270 = 14.82 Vdc
q. Power Supply and Load Requirements
r. Environmental Conditions
Items
Operational condition
Working
temperature
-40 to 85
℃ (-40 to 185
°
F)
, integrated
LCD display: -20 to 70
℃ (-4 to 158
°
F)
Storage
temperature
-40 to 110 ℃ (-40 to 230 °F), integrated
LCD display: -40 to 85 ℃ (-40 to 185 °F)
Media
temperature
Silicone oil filling: -40 to 120 ℃ (-40 to
248 °F)
Working humidity
5-100 % RH @40
℃
Protection class
IP66
Hazardous
location
ExiaIICT4 or ExdIICT6
R
( Ω) External load resistance
R=
U-10.5
0.021
600
Digital
communication
range
HART
0
10 . 5 16 . 5 23 . 8
55
Power supply