Siemens ET 77E Series Spezifikationen PDF herunterladen (Seite 35)

SD77

5.6 MODEL 77 TO MODEL 77-R CONVERSION

With this conversion, the transducer will have a reverse acting output (e.g. 4 mA =15 psig and 20 mA = 3 psig). The

parts needed for conversion are listed below.

Description Part Number Quantity

12624-4 Spring 1

12392-53 Gasket 1

10660-501 Bottom Cover 1

12330-95 Tag 1

The conversion procedure follows. Refer to Figure 5-2 and to the

parts list at the back of this Instruction as needed.

FIGURE 5-2 Conversion Parts

1. Invert the transducer.

2. Remove the bottom plate. Keep the transducer inverted to prevent spilling of the Silicone fluid. If the fluid is

spilled, it must be replaced. Refer to Damping Fluid above.

3. Wipe all traces of Silicone fluid from the bottom plate, both sides of the gasket, and the bottom surface of the

housing.

4. Place spring PN 12624-4 securely in the groove in the bottom cover, PN 10660-501.

5. Replace the installed gasket with the PN 12392-53 gasket from the kit.

6. Install the bottom cover and spring and tighten securely.

7. Turn the transducer right side up. Strike the lower end of the housing with a plastic hammer to center the spring

on the float.

8. Attach the PN 12330-95 paper tag to the transducer.

9. Reverse the polarity of the input signal leads.

10. Refer to Section 4 Calibration and calibrate the transducer. The change to the normal calibration procedure is

that the ZERO adjustment is used to achieve a 15 psig output, and the RANGE adjustment is used to achieve a

3 psig output.

For warranty and non-warranty repair, refer to Customer/Product Support in this manual.

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Siemens ET 77E Series Spezifikationen Seite 35