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3300 Wave Radar Level Interface Transmitter loop powered liquids slurries explosion proof

Select Guided Wave Radar Transmitter

The 3300 Series transmitter consists of transmitter housing, tank connection and probe. Probe and tank seal are the only parts in contact with tank atmosphere.

This transmitter can be equipped with different probes to fulfill various application requirements.

1) Transmitter Housing
The transmitter is available in two models, 3301 3302, and it can be ordered with Intrinsically Safe or Explosion Proof / Flame Proof approvals.

The dual compartment transmitter housing can be removed without opening the tank. It has electronics and cabling separated. The housing has two entries for conduit / cable connections.

The 3300 Series is available with 1/2 inch NPT cable entry, and M20 or PC 13.5 adapter as an option.


2) Tank Connections
The tank connection consists of tank seal, a welded flange (EN (DIN), ANSI, Fisher or Masoneilan) or NPT or BSP/G threads (1 or 1.5 in. depending on probe type)

The following table gives the temperature ranges for tank seal with different O-ring material.

Tank seal with different
O-ring material		 Min. Temperature
oF (oC) in air		 Max. Temperature
oF (oC) in air
Viton 5 (-15) 302 (150)
Ethylene Propylene (EPDM) -40 (-40) 266 (130)
Kalrez 6375 14 (-10) 302 (150)
Buna-N -31 (-35) 230 (110)

 

3) Probes
Several versions of probes re available: Coaxial, Rigid Twin and Rigid Single Lead, Flexible Twin and Flexible Single Lead.

Total probe length is defined from upper reference point to end of probe (weight included if applicable).

 

 

 

Dead Zones
Dead zones are areas where measurements can't be made or will have reduced accuracy. See picture and table to below.

If measurements are desired at the very top of the tank, it is possible to mechanically extend the nozzle and use the coaxial probe. Then the upper dead zone is moved into the extension.

lower dead zone flexible single lead probe chuck clamp
For a flexible single lead probe with chuck, the lower
dead zone is measured upwards from the upper clamp.

 

 3303 radar level tank seal flange dual compartment transmitter housing
3300 process temperature pressure diagram rosemount transmitters
Process temperature and pressure diagram
for 3300 series transmitters. Final rating
depends on flange and O-ring selection.

 


probes coaxial rigid twin single lead flexible probe length
Total Probe Length and Upper Reference Point
(right below flange / thread)

lower dead zone upper reference point max range
  Dielectric Constant Coaxial Probe Rigid Twin Lead Probe Flexible Twin Lead Probe Rigid Single Lead Probe Flexible Single Lead Probe
Upper(1)
Dead Zone		 80 4 in.
(10 cm)		 4 in.
(10 cm)		 5.9 in.
(15 cm)		 4 in.
(10 cm)		 5.9 in.
(15 cm)
2 4 in.
(10 cm)		 4 in.
(10 cm)		 8 in.
(20 cm)		 4 in.
(10 cm)		 20 in.
(50 cm)
Lower(2)
Dead Zone		 80 1.2 in.
(3 cm)		 2 in.
(5 cm)		 2 in.(3)
(5 cm(3))		 2 in.
(5 cm)		 2 in.(3)
(5 cm(3))
2 2 in.
(5 cm)		 4 in.
(10 cm)		 4.7 in.(3)
(12 cm(3))		   2 in.(3)
(5 cm(3))

(1) the distance from the referenc e point where measurements should be avoided, see picture above.
(2) The distance from the probe end where measurements have reduced accuracy, see picture above.
(3) Note that the weight length adds to non-measureable area and is not included in the diagram.

Note
The 4-20 mA set points should be configured between the dead zones, within the measuring range (see the picture & diagram above).

 

 

INTERFACE
3302 rosemount 3301 interface level
Interface Measurement with Model 3302
and 3301 (fully immersed probe)

Model 3302 is the ideal choice for measuring the interface of oil, water, and other liquids with significant dielectric differences. It is also possible to measure interface with the Model 3301 in bridle / tank applications when the probe is fully immersed in the liquid.

Coaxial, Rigid twin, Flexible twin and Rigid Single lead probes can be used for measring interfaces. However, the coaxial probe is the preferred choice.

For measuring the interface level, the transmitter uses the residula wave of the first reflection. Part of the wave which was not reflected at the upper product surface, continues until it is reflected at the lower product surface. The speed of this wave depends fully on the dielectric constant of the upper product.

If interface is to be measured, follow the criteria listed:

  • The dielectric constant of the upper product must be known and should not vary. The Radar Configuration Tools software has a built-in dielectric constant calculator to assist the user in determining the dielectric constant of the upper product.
  • The dielectric constant of the upper product must have a lower dielectric constant than the lower product in order to have a distinct reflection.
  • The different between the dieletric constants for the two products must be larger than 10.
  • Maximum dielectric constant for the upper product is 10 for the coaxial probe and 5 for twin lead probes.
  • The upper product thickness must be larger than 8 in. (0.2 m) for the flexible twin lead probe and 4 in. (0.1. m) for the rigid twin lead and coaxial probes in order to distinguish the echoes of the two liquids.

The maximum allowable upper product thickness / measuring range is primarily determined by the dielectric constants of the two liquids. Target applications include interfaces between oil / oil-like and water / water-like liquids with low (<3) upper product dielectric constant and high (>20) lower product dielectric constant.

For such applications, maximum measuring range is only limited by the length of the coaxial, rigid twin and rigid single(1) lead probes.
Maximum Measuring Range,
Flexible Twin Lead Probe, ft (m)
3300 upper product dielectric constant thickness

For the flexible twin lead probe, maximum measuring range will be reduced dependingon maximum upper product thickness according to the diagram to the left. However, characteristics vary widely between different applications.

Example:
If the upper product dielectric is 2 and maximum upper product thickness is 9.8 ft (3 m), maximum measuring range will be 74.1 ft (22.6 m).


Emulsion Layer
Sometimes there is an emulsion layer (mix of the products) between the two products which, depending on its characteristics, will affect interface measurements.

(1) Be aware of the minimum upper product dielectric constant for the rigid single lead probe.

 

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Click here for full detailed product spec sheet

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