KROHNE OPTIMASS with MFC 300 EN - Manual (Page 133)

133
11.3 Driver or Sensor Coil Fault
Typical inductance and resistance values:
• The above data are provided as a rough guide only.
• Damaged magnet coil assembly: Inductance values in brackets.
• Driver = Black and Grey.
• Sensor A = White and Yellow. Sensor B = Green and Purple.
• RTD = Red and Blue (530...550 ) at ambient temperature
• Resistance values outside these values could indicate a circuit failuire. Meter may be in
start-up or have measuring errors.
• All circuit should be isolated from ground (meter case) and each other:
>
20M . If circuits
are shorting to ground, meter may be in start-up.
Caution:
If the measuring tube/s fail, process fluid can leak into the outer casing. If this happens,
depressurise the meter and remove it from the process line as soon as it safe to do so.
• The above data are provided as a rough guide only.
• Damaged magnet coil assembly: Inductance values in brackets.
• Driver = Purple/Black and Orange/Grey.
• Sensor A = White and Yellow. Sensor B = Green and Yellow.
• RTD = Red and Blue (530...550 ) at ambient temperature
• Resistance values outside these values could indicate a circuit failure. Meter may be in
start-up or have measuring errors.
• All circuit should be isolated from ground (meter case) and each other:
>
20M . If circuits
are shorting to ground, meter may be in start-up.
Caution:
If the measuring tube/s fail, process fluid can leak into the outer casing. If this happens,
depressurise the meter and remove it from the process line as soon as it safe to do so.
OPTIMASS
3000
Inductance (mH) Resistance (Ohm)
Driver Sensor A/B Driver Sensor A/B
01 1.2 (1.2) 7.2 (7.2) 54...60 105...110
03/04 2.6 (8.9) 10.5 (10.36) 43...50 132...138
Tube strain = Red and Brown:
OPTIMASS 7000 – 06 600 - 800 at ambient
OPTIMASS 7000 – 10...80 420 - 560 at ambient
IC strain= Brown and Orange
OPTIMASS 7000 – 06...10 225 - 275 at ambient
OPTIMASS 7000 – 15...80 Not fitted
OPTIMASS 7000
Inductance (mH) Resistance (Ohm)
Driver Sensor A/B Driver Sensor A/B
06/10 5.30 (4.32) 17.32 (10.36) 37...42 147...152
15/25 11.7 (8.9) 17.32 (10.36) 40...51 147...152
40 13.1 (11.3) 17.32 (10.36) 80...82 147...152
50/80 23.5 (12.9) 17.32 (10.36) 98...102 147...152