Rosemount Model 1195/ProPlate/Mass ProPlate
9-8
RTD TROUBLESHOOTING To test the 4 wire RTD (refer to Figure 9-1):
1. Disconnect power from the electronics.
2. Remove the Temperature Terminal Housing cover.
3. Disconnect the RTD lead wires from the terminal block.
4. Separate the wires so that the un-insulated ends are not touching
anything.
5. Check that the resistance measured between the 2 red wires is the
same as the resistance measured between the 2 white wires within
+/- 0.1 ohms. Take note of the resistance value measured between
the 2 white wires for use in step 6.
6. Measure the resistance between one red wire and one white wire.
Subtract the resistance measured in step 5 from the resistance
measured in this step. Refer to table 14-1 to determine if this
resistance matches the temperature that the RTD is in contact
with.
7. Check the resistance between any wire and the RTD head or
sheath. An acceptable resistance is 200 K ohms or greater.
8. If any of the above measurements are not within the acceptable
range as stated above, contact Dieterich Standard, Inc. (303)
530-9600 for a replacement RTD.
9. To return the RTD to service, connect the lead wires as shown in
Figure 9-1.
10. Replace the Temperature Terminal Housing cover.
11. Re-connect power to the electronics.
Figure 9-1. Temperature Terminal
Housing
Replacing an RTD If an RTD needs to be replaced, proceed as follows:
1. Disconnect power from the electronics.
2. Remove the Temperature Terminal Housing cover.
3. Disconnect the RTD lead wires from the terminal block.
4. Use a 7/16 inch deep socket and a pair of vise grip pliers to remove
the RTD from the thermowell. It is necessary to feed the wires
through the socket to avoid damaging the lead wires. Grip the
socket with the vise grip pliers and turn the socket to remove the
RTD.
Take care not to damage the RTD lead wires or insulation.
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