Astar HT-3300 Especificaciones descargar pdf (Pagina 149)

139

Reference Manual

00809-0100-4811, Rev DA

Appendix A: Reference Data

January 2015

Reference Data

Probe type in chamber considerations

When installing a Rosemount 3300 Series in a chamber, the single lead probe is recommended.

The recommended minimum chamber diameter is 4 in. (100 mm) for single flexible probes and

3 in. (75 mm) for the single rigid probe. The probe should be centered to prevent it touching the

sides of the well.

The probe length determines if a single rigid or single flexible probe should be used:

 Less than 19.7 ft. (6.0 m): Rigid single probe is recommended. Use a centering disc for

probes longer than 3.3 ft. (1 m). If the installation requires less head-space, use a

flexible single probe with a weight and centering disc.

 More than 19.7 ft. (6.0 m): Use flexible single probe with a weight and centering disc.

A short weight is available for the single flexible SST probe. It is used for measuring close to the

probe end and shall be used where the measuring range must be maximized. The height is 2 in.

(50 mm) and the diameter is 1.5 in. (37.5 mm). The option code is W2.

If a heavier weight is needed, option code W3 can be used (height is 5.5 in. (140 mm) and the

diameter is 1.5 in. (37.5 mm).

Centering discs

To prevent the probe from contacting the chamber or pipe wall, centering discs are available for

rigid single, flexible single, and flexible twin lead probes. The disc is attached to the end of the

probe. Discs are made of stainless steel, Alloy C-276, Alloy 400, or PTFE.

When mounting a centering disc, it is important that it fits correctly in the chamber/pipe. See

Table A-9 on page 140 for Dimension D.

Figure A-22. Centering Disc

Table A-10 on page 141 shows which centering disc diameter to select for a particular pipe.

1 2 ... 144 145 146 147 148 149 150 151 152 153 154 ... 223 224

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