Siemens CA 333 Series Spezifikationen PDF herunterladen (Seite 12)

SD74

2.5 RANGE AND SUPPRESSION SPRING KITS

There are three spring kits: rectilinear range, rotary range, and suppression. Each is packaged separately and is

assembled on the Model 74 by the instrument installer. Available kits are listed in Section 1.3. Springs are color-

coded and spring colors are included in the tables in Section 1.3.

IMPORTANT

Install the suppression spring kit (if needed) before installing a range spring kit; see

Section 2.5.3 Suppression Spring Kit.

2.5.1 Rectilinear Range Spring Kit

Refer to Figure 2-2 and the following procedure to assemble the

range spring kit on the Model 74. Table 1-1 lists available rectilinear

range spring kits and the color code for each spring.

1. Set the lower spring seat, knurled edge down, on the range

spring.

2. Start the spring through the cut in the spring seat and turn three

revolutions counterclockwise.

3. Set the upper spring seat, knurled edge up, on the range spring.

4. Start the spring through the cut in the spring seat and turn two

revolutions counterclockwise. There should be one coil between

spring seats.

5. Attached the range spring hook to the input diaphragm assembly

stem (see Figure 4-1).

6. Insert the zero adjusting screw through the take-off arm into the

spring seats (see Figure 2-2).

7. Refer to the Section 3 Calibration and calibrate

the Model 74.

8. Turn the upper spring seat clockwise to lock the

zero screw in place. The cut on the upper spring seat will be approximately 3/4" away from the cut on the lower

spring seat when locked.

IMPORTANT

If the Model 74 is mounted where severe vibration may be encountered, the locknut

shown in Figure 2-2 should be installed. Tighten the 1/4-20 locknut against the upper

spring seat.

2.5.2 Rotary Range Spring Kit

See Figure 2-3 and the following procedure to assemble the rotary range spring kit on the Model 74. Figure 2-4

shows the common parts of a rotary range spring assembly. Range spring assemblies listed in Table 1-2 differ only

in the range spring required. Range springs are color-coded and spring colors are listed in Table 1-2.

FIGURE 2-2 Rectilinear Range Spring Kit - Assembled

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Siemens CA 333 Series Spezifikationen Seite 12