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2500 and 2503 Controllers/Transmitters
June 2017
1. Remove the controller/transmitter as described previously.
2. A controller/transmitter is attached to the sensor in one of the mounting positions shown in figure 4. Right‐hand
mounting is with the controller/transmitter case (key 1) to the right of the displacer (FLOAT), as you look at the
front of the case, left‐hand mounting is with with the case to the left of the displacer. For a 249 sensor, remove the
torque tube arm from the sensor or vessel and reinstall the torque tube arm in the opposite position according to
the appropriate instruction manual. Note that the term FLOAT is marked on the RAISE LEVEL dial and the indicator
plate, if one is used.
3. Check the desired control action. If the control action is not correct, refer to the changing action procedures to
change it. Mount the Bourdon tube in one of the positions shown in figure 15.
4. The arrow on the RAISE LEVEL dial under the word FLOAT should point toward the displacer. If not, remove the dial
from the controller, turn it over, and install it in the correct position.
5. For a controller/transmitter with an indicator assembly, the arrow near the word FLOAT on the indicator plate
should point toward the displacer. If it does not, remove the two screws (key 41, see detail of indicator assembly in
figure 16), turn the front plate (key 54) to the side with the FLOAT arrow pointing toward the displacer, and secure
the plate with the screws.
6. Install the controller/transmitter according to the next section.
Installing Controller/Transmitter on Sensor
Note
If the installation is in a location that is not readily accessible and shop calibration is required, remove the torque tube arm from
the cage or vessel before installing the controller or transmitter to the sensor. Install the controller/transmitter on the torque tube
arm in the shop; then calibrate and return the controller/transmitter with the torque tube arm assembly attached for installation.
Perform step 1 only if adding a heat insulator to a unit that does not have one. Key numbers in this step are shown in figure 14.
1. To install the heat insulator, secure the shaft extension (key 37) to the torque tube assembly rotary shaft with the
shaft coupling (key 36). Tighten both set screws (key 38), with the coupling centered as shown in figure 14. Then
mount the insulator assembly (key 35) on the controller/transmitter case with four button head cap screws and
washers (keys 40 and 53). Tighten the screws.
CAUTION
In the following step, avoid bending the rotary shaft of the torque tube assembly. Bending or side loading of this shaft
could cause erroneous readings. Additionally, make sure the ball bearing assembly (key 12, figure 16) is removed from the
case (key 1, figure 16) to provide clearance when installing the case on the sensor.
2. Remove the bearing assembly (key 12, figure 16) from the case (key 1, figure 16).
3. Carefully slide the controller/transmitter case straight in. Secure the case on the torque arm or insulator with the
four cap screws (key 39).
Note
If a heat insulator is used, do not insulate its exterior.
34
Instruction Manual
D200124X012
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