KROHNE MFC 300 EN - Manual (Page 128)

7
SERVICE
128
MFC 300
www.krohne.com 02/2012 - 4000498602 - MA MFC 300 R03 en
7.2.4 OPTIMASS 7000
The specified values are for guidance only.
• Driver = black and grey
• Sensor A = white and yellow
• Sensor B = green and violet
• Pt500 = red and blue (530…550 Ω) at ambient temperature
• Resistance values outside of the ranges specified above may indicate a circuit error. The
device may be in "start-up" mode or indicate measuring errors.
• All circuits should be isolated with respect to earth (device housing) and each other >20 MΩ.
• An exciter/sensor coil short circuit may cause the meter to be in "start-up" mode.
Size Resistance (Ohm)
Driver Sensor A/B
06 / 10 40 142
15 49 142
25 41 142
40 / 50 / 80 100 142
Strain MT = red and brown OPTIMASS 7000 - all sizes 420...560 Ω at ambient
temperature
Strain IC = brown and orange OPTIMASS 7000 - 06...10 225...275 Ω at ambient
temperature
OPTIMASS 7000 - 15...80 Short circuited
INFORMATION!
Failure of two or more of the upper circuits may indicate a measuring tube error. There may be
product in the housing. If this is the case, depressurise
depressurise depressurise depressurise the process line and immediately remove
the measuring device from the process line.
.book Page 128 Monday, February 6, 2012 11:01 AM