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Jerguson Series 20 Medium Pressure Armored Gages
Pressures Up To 3270 PSI @ 100° F / 2285 PSI @ 600° F

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.

Standard construction (for Series 20 Gage) includes a one-piece chamber machined from bar, forged steel covers,tempered glass, alloy steel bolts and nuts. Select reflex glass (prismatic) Style Glass or transparent (clear) glass gage.  The recessed gasket seats aid in positioning and retaining the gasket.  Series 20 gages are available in a wide variety of materials to meet specific applications.   Accessories available include: illuminators, non-frosting extensions, support brackets and insulation jackets.  Our 316 Stainless Steel is dual rated for standard 316 and 316L Grade.  Available in Low Temperature Carbon Steel
Click to openFeatures/Specifications: (click to open & close)
  • close hookup series 140 valve Series 140 Valves Standard Chamber Material: Carbon Steel (A696 C), Low Temperature Carbon Steel (A350 LF2) and 316LSS (A511 Dual Rated for 316SS & 316LSS)
  • Tempered Borosilicate Glass conforming to BS3463, JIS B8211, DIN 7080 & DIN 7081
  • All gages are Hydrostatically Tested to 1-1/2 times the rated pressure at 100º F (38ºC)
  • Wetted Parts Conform to NACE MR-01-75
  • All Parts are ASTM Grade and listed in ANSI 31.3
  • Recessed Gasket Seat in Chamber and Cover
  • Covers are Shrouded to Protect the Glass Edge

Specifications:

  • Section Lengths: Gage sections are available in nine standard glass sizes. Longer sizes are constructed with multiple vision slots in a continuous solid bar chamber.
  • Connections: Standard connections are at top and bottom and are 1/2" or 3/4" NPT female. Optional connections are available, such as socket weld, flanged or close hook-up (side/side).
  • Liquid Chamber: Machined bar stock. The gasket seat is recessed to allow lateral support and facilitate positioning.
  • Covers: Forged carbon steel is standard. Optional materials are available such as 316SS. The cushion gasket seat is recessed.
  • Bolts & Nuts: Alloy steel is standard, A193 B7 and A194 2H. Optional materials are available. All steel fasteners are "black oxide" treated to prevent rust.
  • Glass: Tempered Borosilicate is used to 600° F (316° C). Aluminosilicate is used to 800° F (427° C). Transparent glass may be protected from corrosive media with mica or Neoflon CTFE shields.
  • Gaskets: Standard gaskets are precision die cut in proprietary Jerguson dies.
  • Finish: All steel parts are finish coated prior to assembly. Stainless steel is not coated.

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 open & close)
Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Offset Inside Fig. 8 Offset Outside
gage connection gage connection gage connection gage connection gage connection gage connection gage connection gage connection
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 openSeries 20 Models and Dimensions: (click to open & close)
Sect. Size
Visible Range
Overall Length
Reflex, R-20 Weight
Transp., T-20 Weight
  in mm in mm Lbs. Kgs Lbs. Kgs
Single-Section Gages
11 3-3/4 95 5-1/4 133 8 3.6 10 4.5
12 4-3/4 121 6-1/4 159 9 4.1 14 6.4
13 5-3/4 146 7-1/4 184 11 5.0 17 7.7
14 6-3/4 171 8-1/4 210 12 5.5 19 8.6
15 7-7/8 200 9-3/8 238 14 6.4 21 9.5
16 9-1/8 232 10-5/8 270 16 7.3 24 10.9
17 10-1/4 260 11-3/4 298 18 8.2 27 12.3
18 11-7/8 302 13-3/8 340 20 9.1 30 13.6
19 12-5/8 321 14-1/8 359 21 9.5 32 14.5
Two-Section Gages
23 13 330 14-1/2 368 22 10.0 33 15.0.
24 15 381 16-1/2 419 25 11.4 38 17.3
25 17-1/4 438 18-3/4 476 28 12.7 43 19.5
26 19-3/4 502 21-1/4 540 32 14.5 49 22.3
27 22 559 23-1/2 597 35 15.9 54 24.5
28 25-1/4 641 26-3/4 679 40 18.2 61 27.7
29 26-3/4 679 28-1/4 718 43 19.5 64 29.1
Three-Section Gages
36 30-3/8 772 31-7/8 810 48 21.8 73 33.2
37 33-3/4 857 35-1/4 895 53 24.1 80 36.4
38 38-5/8 981 40-1/8 1019 60 27.3 92 41.8
39 40-7/8 1038 42-3/8 1076 64 29.1 97 44.1
Four-Section Gages
47 45-1/2 1156 47 1194 71 32.3 107 48.6
48 52 1321 53-1/2 1359 80 36.4 122 55.5
49 55 1397 56-1/2 1435 85 38.6 129 58.6
Five-Section Gages
57 57-1/4 1454 58-3/4 1492 88 40.0 134 60.9
58 65-3/8 1661 66-7/8 1699 100 45.5 152 69.1
59 69-1/8 1756 70-5/8 1794 106 48.2 161 73.2
Six-Section Gages
68 78-3/4 2000 80-1/4 2038 120 54.5 187 85.0
69 83-1/4 2115 84-3/4 2153 127 57.7 196 89.1
Seven-Section Gages
78 92-1/8 2340 93-5/8 2378 140 63.6 221 100.5
79 97-3/8 2473 98-7/8 2511 148 67.3 230 104.5
88 105-1/2 2680 107 2718 160 72.7 254 115.5
89 111-1/2 2832 113 2870 169 76.8 265 120.5
Click to openOptions and Adders: (click to open & close)
Isolation Valves EPL-100
Side and/or Back Connections
Flanged or Socket Weld Connections
Grafoil Gaskets, Mica Shields, Teflon Gaskets & Kel-F Shields
Drain Valves
Non-Frost Extensions
Aluminosilicate Glass
Heating / Cooling Tubes (both internal & external)
Spring Washers
Illuminators (plastic wedge reflectors, fiber optic illumination & LED Illumination) - See complete Details
316SS Non-Wetted Parts (covers & bolting)
Offshore Coating per FP-11
Insulation Jackets
Expansion Loops & Coils
Scales (Campbell's Foot Scales, Brass Scales and 316SS Photo Etched Scales)