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Jerguson Series 300L Low Pressure Armored Level Gages

Standard construction includes a solid one-piece chamber machined from bar, bar stock covers, tempered glass, steel bolts and nuts.  Series 300L gages are available with carbon steel or stainless steel chambers.  The Series 300L replaces the old Series 12 which replaced the old Series 5 gages.

One of the simplest techniques for indicating liquid level is by means of a direct reading device with which the level can be seen visually. A common method of providing such visual indication is by installing direct reading gages in the vessel itself. These direct reading gages are placed at different locations or points to indicate the liquid height. More often, separately mounted gage glasses are used to provide a continuous indication of level over a certain vertical distance on the vessel.

The transparent glass gage consists of a one piece central chamber with cover plates on each side that hold the two glass windows. The chamber and cover plates have machined recesses that keep all the parts aligned and prevent the gaskets and cushions from shifting. When the level of caustic or acidic fluids is indicated, the inside surfaces of both glasses are lined with a protective coating of transparent mica. After prolonged exposure to high temperature, chemically-treated water, the mica will become opaque. This discoloration indicates that the mica has failed and water is now in direct contact with the glass. When this happens, the glass should be changed, before it fails.

The glass itself is also tempered for resistance to both mechanical and thermal shock. Care must be taken when assembling the unit and tightening the bolts to prevent glass failure. It is safest to use the crossover method of tightening by starting at the center and working outwards.

Besides being suitable for caustic and acidic liquids, the flat glass is also suitable for dirty materials, high pressure steam applications and other service where it is necessary to illuminate the glass from the rear.

The reflex gage is best suited for clean, colorless, non-viscous, and non-corrosive fluids including light and heavy hydrocarbons. This gage has special optical properties that create a sharp line of demarcation at the liquid level. A dark area represents the liquid in the glass gage contrasted by a light area above the liquid.

Click to openFeatures::  (click to view)
  • EPL-100 Standard Chamber Material: Carbon Steel (A696 C) and 316LSS (A511 Dual Rated for 316SS & 316LSS)
  • Tempered Borosilicate Glass to BS 3463, JIS B8211, DIN 7080 & DIN 7081
  • Standard wetted parts conform to NACE MR.-01-75 materials.
  • All parts listed in ANSI 31.3
  • Full ANSI 300# pressure class rating to 600º F (316º C)
  • Recessed gasket seats in both chamber and cover
  • Visible length from 10-1/4" up

Specifications:

  • Length: Series 300L gages are available in six standard visible glass lengths. Multiples of the same size windows in a single piece bar stock liquid chamber are used for longer lengths.
  • Connections: Standard Series 300L gages are furnished with 1/2" or 3/4" N. P.T. female end connections.
  • Liquid Chamber: Machined from bar stock.
  • Covers: Steel, recessed gasket seat.
  • Bolts& Nuts: Steel, heat treated for strength.
  • Glass: Tempered glass. The glass must be protected from mediums that are corrosive to it such as used caustic and hydrofluoric acid. Transparent glass can be protected with mica or Neoflon CTFE shields must be in these applications.
  • Gaskets: Precision die cut from the highest quality materials

NOTE: It is recommended that all gages be installed with Jerguson gage valves having safety ballchecks which help provide protection against physical injury and loss of product if glass breakage should occur.

Click to openSpecify Gage Assemblies by the Figures given below:  (click to view)
Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Offset Inside Fig. 8 Offset Outside
jerguson jerguson jerguson jerguson jerguson jerguson jerguson jerguson
Valves Valves Valves Valves Valves Valves Valves Valves
63, 143, 73BL & 93 64, 144, 74BL & 94 66, 146 & 76BL 67, 147 & 77BL 63, 143, 73BL & 93 64, 144, 74BL & 94 146, 147, 66, 67, 76BL & 77BL 146, 147, 66, 67, 76BL & 77BL
Click to openOptions and Adders (click to view)
Click to openDesign Ratings for all Glass Sizes, Reflex and Transparent (click to view)
Carbon Steel Chamber Stainless Steel Chamber
Temp. Pressure Temp. Pressure
ºF ºC kPaG BarG Kg/cm² PSIG ºF ºC kPaG BarG Kg/cm² PSIG
100 38 5171 51.7 52.7 750 100 38 4964 49.7 50 720
200 93 5171 51.7 52.7 750 200 93 4275 42.78 43.4 620
300 149 5033 50.3 51.3 730 300 149 3844 38.6 39.2 560
400 204 4861 48.6 49.5 705 400 204 3551 35.5 36.1 515
500 260 4585 45.9 46.7 665 500 260 3310 33.1 33.6 480
600 316 4171 41.7 42.5 605 600 316 3103 31.0 31.5 450
Click to openSeries 300L Liquid Level Gage Model Specifications  (click to view)

300L Size

Visible Glass

Reflex Gage Weight

Transparent Gage Weight

Overall Length 

 

inches

mm

lbs.

Kg

lbs.

Kg

(inches)

111

10-¼

260

11

5.0

15

6.8

12

112

11-¼

286

12

5.5

16

7.3

13

113

12-¼

311

13

5.9

17

7.7

14

115

14-¼

362

15

6.8

20

9.1

16

118

17-¼

438

18

8.2

26

11.8

19

120

19-¼

489

20

9.1

30

13.6

21

211

22-3/8

568

22

10.0

30

13.6

24

212

24-3/8

619

24

10.9

32

14.5

26

213

26-3/8

670

26

11.8

34

15.5

28

215

30-3/8

772

30

13.6

40

18.2

32

218

36-3/8

924

36

16.4

52

23.6

38

220

40-3/8

1026

40

18.2

60

27.3

42

311

34-½

876

33

15.0

45

20.5

36-1/4

312

37-½

953

36

16.4

48

21.8

39-1/4

313

40-½

1029

39

17.7

51

23.2

42-1/4

315

46-½

1181

45

20.5

60

27.3

48-1/4

318

55-½

1410

54

24.5

68

30.9

57-1/4

320

61-½

1562

60

27.3

90

40.9

63-1/4

300L Size

Visible Glass

Reflex Gage Weight

Transparent Gage Weight

Overall Length 

411

46-½

1181

44

20.0

60

27.3

48-1/4

412

50-½

1283

48

21.8

64

29.1

52-1/4

413

54-½

1384

52

23.6

78

35.5

56-1/4

415

62-½

1588

60

27.3

80

36.4

64-1/4

418

74-½

1892

72

32.7

94

42.7

76-1/4

420

82-½

2096

80

36.4

120

54.5

84-1/4

511

58-5/8

1489

55

25.0

75

34.1

60-3/8

512

63-5/8

1616

60

27.3

80

36.4

65-3/8

513

68-5/8

1743

65

29.5

95

43.2

70-3/8

515

78-5/8

1997

75

34.1

110

50.0

80-3/8

518

93-5/8

2378

90

40.9

130

59.1

95-3/8

520

103-5/8

2632

100

45.5

150

68.2

105-3/8
611
70-3/4
1796
66
30.0
90
40.9
72-1/2
612
76-3/4
1949
72
32.7
96
43.6
79-1/2
613
82-3/4
2101
78
35.5
102
46.4
84-1/2
615
94-3/4
2406
90
40.9
120
54.5
96-1/2
618
112-3/4
2863
108
49.1
153
70.9
114-1/2

620

124-¾

3169

120

54.5

180

81.8

129-1/2
Model Number Example ......... 518-R-300L
Translates: (5) Sections of Size 18 Glass, Reflex Style, Series 300L
Model Number Example .......... 518-T-300L
Translates: (5) Sections of Size 18 Glass, Transparent Style, Series 300L