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129

Reference Manual

00809-0100-4811, Rev DA

Appendix A: Reference Data

January 2015

Reference Data

Table A-5. Measuring Range and Minimum Dielectric Constant When Using Remote Housing

Different parameters (factors) affect the echo and therefore the maximum measuring range

differs depending on application according to:

 Disturbing objects close to the probe

 Media with higher dielectric constants (

) give better reflection and allow a longer

measuring range

 Surface foam and particles in the tank atmosphere may affect measuring performance

 Heavy coating or contamination on the probe should be avoided since it can reduce

measuring range and might cause erroneous level readings

Note

See Table A-5 on page 129 for the measuring range when using the remote housing.

Interface measuring range

Target applications include interfaces between oil; oil-like and water; and water-like liquids with

a low (< 3) upper product dielectric constant and a high (>20) lower product dielectric constant.

For such applications, the maximum measuring range is only limited by the length of the

coaxial, rigid twin, and rigid single lead probes.

For the flexible twin lead probe, the maximum measuring range will be reduced depending on

the maximum upper product thickness according to the diagram (inset, right).

Example: If the upper product dielectric constant is 2, and the upper product thickness is 5 ft.

(1.5 m), the maximum measuring range is 75.5 ft. (23 m).

However, characteristics vary between different applications.

Rigid single lead /

segmented rigid

single lead

Flexible

single lead

Coaxial

Rigid

twin lead

Flexible

twin lead

Maximum

measuring range

9 ft. 10 in. (3 m) -

for 8 mm probes

(code 4A)

14 ft. 9 in. (4.5 m) -

for 13 mm probes

(code 4B, 4S)

72 ft. (22 m)

19 ft. 8 in.

(6 m)

9 ft. 10 in.

(3 m)

72 ft. (22 m)

Minimum dielectric

constant with

1 m remote housing

2.7 (2.0 if installed

in a metallic bypass

or stilling well)

(1)

(1) May be lower depending on installation.

2.7 up to 36 ft. (11 m)

6 up to 66 ft. (20 m)

10 up to 72 ft. (22 m)

1.5 2.1

1.7 up to 33 ft. (10 m)

2.2 up to 66 ft. (20 m)

2.6 up to 72 ft. (22 m)

Minimum dielectric

constant with

2 m remote housing

3.3 (2.2 if installed

in a metallic bypass

or stilling well)

(1)

3.2 up to 36 ft. (11 m)

8 up to 67 ft. (20.5 m)

1.6 2.5

1.8 up to 33 ft. (10 m)

2.4 up to 67 ft. (20.5 m)

Minimum dielectric

constant with

3 m remote housing

3.8 (2.5 if installed

in a metallic bypass

or stilling well)

(1)

3.7 up to 36 ft. (11 m)

11 up to 62 ft. (19 m)

1.7 2.8

2.0 up to 33 ft. (10 m)

2.7 up to 62 ft. (19 m)

1 2 ... 134 135 136 137 138 139 140 141 142 143 144 ... 223 224

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