Emerson Process Management 2400S manual 4Feedthrough pins

Troubleshooting

Table 11-8Nominal resistance ranges for flowmeter circuits continued

Circuit	Pin pairs	Nominal resistance range(1)
Flow tube temperature sensor	RTD + and RTD –	100 Ω at 0 °C + 0.38675 Ω / °C
LLC/RTD
• T-Series sensors	RTD – and composite RTD	300 Ω at 0 °C + 1.16025 Ω / °C
• CMF400 I.S. sensors	RTD – and fixed resistor	39.7–42.2 Ω
• F300 sensors	RTD – and fixed resistor	44.3–46.4 Ω
• All other sensors	RTD – and LLC	0

(1) Actual resistance values depend on the sensor model and date of manufacture. Contact Micro Motion for more detailed data.

Figure 11-4Feedthrough 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 T-Series, CMF400 I.S., and F300. For T-Series sensors, functions as composite RTD. For CMF400 I.S. and F300 sensors, functions as fixed resistor.

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™