Rosemount 8712 - Page 128

Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
B-4
SPECIAL CONDITIONS FOR SAFE USE (X):
The relation between ambient temperature, process temperature and temperature class is
to be taken from Table B-3 on page B-5. The electrical data is to be taken from Table B-1 on
page B-4.
Installation Instructions
At ambient temperatures above 50 °C, heat resistant cables with a temperature rating of at
least 90 °C shall be used.
A fuse with a rating of maximum 0,7 A according to IEC 60127-1 shall be included in the
coil excitation circuit if the sensors are used with other flow transmitters.
Table B-1. Electrical Data
Rosemount 8705 and 8711 Sensors
Coil excitation
circuit:
40 V, 0,5 A, 20 W maximum
Electrode circuit: in type of explosion protection intrinsic safety EEx ia IIC, U
i
= 5 V, l
i
= 0.2 mA, P
i
= 1 mW, U
m
= 250 V
Table B-2. Relation between ambient temperature, process temperature,
and temperature class
(1)
(1) This table is applicable for KD approval codes only.
Meter Size (Inches)
Maximum Ambient
Temperature
Maximum Process
Temperature
Temperature
Class
1
/2 115°F (65°C) 239°F (115°C) T3
1 149°F (65°C) 248°F (120°C) T3
1 95°F (35°C) 95°F (35°C) T4
1
1
/2 149°F (65°C) 257°F (125°C) T3
1
1
/2 122°F (50°C) 148°F (60°C) T4
2 149°F (65°C) 257°F (125°C) T3
2 149°F (65°C) 167°F (75°C) T4
2 104°F (40°C) 104°F (40°C) T5
3 - 36 149°F (65°C) 266°F (130°C) T3
3 - 36 149°F (65°C) 194°F (90°C) T4
3 - 36 131°F (55°C) 131°F (55°C) T5
3 - 36 104°F (40°C) 104°F (40°C) T6
6 115°F (65°C) 275°F(135°C) T3
6 115°F (65°C) 230°F (110°C) T4
6 115°F (65°C) 167°F (75°C) T5
6 140°F (60°C) 140°F (60°C) T6
8-60 115°F (65°C) 284°F (140°C) T3
8-60 115°F (65°C) 239°F (115°C) T4
8-60 115°F (65°C) 176°F (80°C) T5
8-60 115°F (65°C) 156°F (69°C) T6