Troubleshooting
Table
Circuit | Pin pairs | Nominal resistance range(1) |
Flow tube temperature sensor | RTD + and RTD – | 100 Ω at 0 °C + 0.38675 Ω / °C |
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LLC/RTD |
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• | RTD – and composite RTD | 300 Ω at 0 °C + 1.16025 Ω / °C |
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• CMF400 I.S. sensors | RTD – and fixed resistor | |
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• F300 sensors | RTD – and fixed resistor | |
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• All other sensors | RTD – and LLC | 0 |
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(1) Actual resistance values depend on the sensor model and date of manufacture. Contact Micro Motion for more detailed data.
Figure 11-4 Feedthrough pins
Drive –
Return for RTD, LLC, composite RTD, or fixed resistor
RTD +
Left pickoff –
Left pickoff +
Drive +
LLC / Composite RTD /
Fixed resistor(1)
Right pickoff +
Right pickoff –
(1)Lead length compensator (LLC) for all sensors except
7.Using the DMM, check each pin as follows:
a.Check between the pin and the sensor case.
b.Check between the pin and other pins as described below:
•Drive + against all other pins except Drive –
•Drive – against all other pins except Drive +
•Left pickoff + against all other pins except Left pickoff –
•Left pickoff – against all other pins except Left pickoff +
•Right pickoff + against all other pins except Right pickoff –
•Right pickoff – against all other pins except Right pickoff +
•RTD + against all other pins except RTD – and LLC/RTD
•RTD – against all other pins except RTD + and LLC/RTD
•LLC/RTD against all other pins except RTD + and RTD –
128 | Micro Motion® Model 2400S Transmitters for DeviceNet™ |