Emerson Rosemount 222, Reference Manual

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5 Troubleshooting
5.1 Troubleshooting
Figure 5-1: Disconnect Wires From Transmitter Before Measuring Resistance
Table 5-1: Resistance vs. Temperature for Temperature Compensation (PT-100 RTD)
Temperature Resistance
10 °C (50 °F) 103.9 Ω
20 °C (68 °F) 107.8 Ω
25 °C (77 °F) 109.7 Ω
30 °C (86 °F) 111.7 Ω
40 °C (104 °F) 115.5 Ω
50 °C (122 °F) 119.4 Ω
5.1.1 Checking the toroid operation
Use the following procedure to check the operation of the toroids.
Procedure
1. Disconnect the shorting strap from one of the outer flanges.
The conductivity reading will drop to zero.
2. Pass a short piece of heavy gauge wire through the space between the toroid
assembly and the pipe.
3. Connect the ends of the wire to a resistance decade box.
4. Turn off temperature correction in the transmitter.
Reference Manual Troubleshooting
00809-0100-3222 September 2018
Rosemount 222 Sensors 21