Emerson Series 3000 MVD Manuel D’Utilisation

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8. There should be no open circuits, i.e., no infinite resistance readings. The LPO and RPO 

readings should be the same or very close (±5

Ω).

9. Using the DMM, check between each pin and the sensor case. With the DMM set to its highest 

range, there should be infinite resistance on each lead. If there is any resistance at all, there is a 
short to case. See Table 22-17 for possible causes and solutions.

10. Test terminal pairs as follows:

a.

Drive + against all other terminals except Drive –

b.

Drive – against all other terminals except Drive +

c.

Left pickoff + against all other terminals except Left pickoff –

d. Left pickoff – against all other terminals except Left pickoff +

e.

Right pickoff + against all other terminals except Right pickoff –

f.

Right pickoff – against all other terminals except Right pickoff +

g. RTD + against all other terminals except LLC + and RTD/LLC

h. LLC + against all other terminals except RTD + and RTD/LLC

i.

RTD/LLC against all other terminals except LLC + and RTD +

There should be infinite resistance for each pair. If there is any resistance at all, there is a short 
between terminals. See Table 22-17 for possible causes and solutions.

11. If the problem is not resolved, contact Micro Motion customer service for assistance. 

To return to normal operation:

Left pickoff –

Right pickoff –

Drive –

Drive +

Right pickoff +

Left pickoff +

LLC / Composite RTD /
Fixed resistor

(1)

RTD +

RTD –