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3300 how to replace displacer in an existing displacer cage

Considerations when changing to 3300
When changing from a displacer to a 3300 Series transmitter, make sure to correctly match the 3300 series flange choice and probe length to the cage. Both standard ANSI and EN (DIN) as well as proprietary cage flanges with a non-standard diameter and gasket surface are used. The following table gives guidelines on required probe length:

Cabe Manufacturer Probe Length
Fisher 249B & C / 259B Displacer + 9 in. (23 cm)
Masoneilan Displacer + 8 in. (20 cm)
Others Displacer + 8in. (20 cm)
approximate value, length can vary

If there is a chance the probe comes into contact with a wall, nozzle or other tank obstruction, the coaxial probe is the only possible choice. Minimum clearance is given in the table below.

  Coaxial Rigid Twin Lead Flexible Twin Lead Rigid Single Lead Flexible Single Lead
Recommended nozzle diameter Enough space to fit the probe 4 in. (10 cm) or more 4 in. (10 cm) or more 6 in. (15 cm) or more 6 in. (15 cm) or more
Min. nozzle diameter (1) Enough space to fit the probe 2 in. (5 cm) 2 in. (5 cm) 2 in. (5 cm) 2 in. (5 cm)
Min. clearance to tank wall or obstruction (2) 0 in. (0 cm) 4 in. (10 cm) or more 4 in. (10 cm) or more 4 in. (10 cm) if smooth metallic wall.
12 in. (30 cm) if disturbing objects, rugged metallic or concrete / plastic wall		 4 in. (10 cm) if smooth metallic wall.
12 in. (30 cm) if disturbing objects, rugged metallic or concrete / plastic wall
Min. pipe / bypass diameter 1.5 in. (3.8 cm) 2 in. (5 cm) (3) Consult factory 2 in. (5 cm) (4) Consult factory

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