Gauge glasses

Gauge glasses


Transparent gauge glass

Transparent level gauge glasses offered by us are made by a recognized, global companies like Klinger, Maxos, Spectraglass of high-quality borosilicate ("extra hard") or aluminosilicate glasses. Glass in the production process is subjected to a two-sided polishing and toughening. This results in products characterized by high mechanical strength and high resistance to alkalis, acids and condensates. In the production process is conducted constant and precise control of transparency and the dimensions of manufactured glass.

Transparent (smooth) level gauge glasses  are used to read the liquid level directly or with the use of CCTV (industrial television). They can be (type TA 28) used up to 180 bar / 356°C for aggressive environments affecting (interacting) the glass (eg. saturated steam, hot water, alkalis) and up to 300 bar / 400°C for soft environments. Glass must be protected from the medium side through the mica shields. They are especially recommended for environments contaminated, viscous and highly corrosive.

Depending on the width and thickness there are four basic types of transparent level gauge glasses:

  • type A - width 30 mm, thickness 17 mm
  • type B - width 34 mm, thickness 17 mm
  • type H - width 34 mm, thickness 22 mm
  • type TA 28 - width of 27.6 mm, 16.8 mm

In addition, the occasionally encountered also:

  • Type C - width of 20 mm, thickness 12 mm
  • Type D - width 25 mm, thickness 15 mm

Transparent level gauge glasses are  supplied in sets with gaskets and mica shields or separately.

Sample contents of the set.

The set, packaged in a common box, consists of:

  • box
  • set of washers 
  • gasket
  • mica shield for the media side
  • mica shield for the place of observation
    (with a hole Φ ca. 1 mm)
  • installation guide


In all TA-28 sets, soft washers and protective washers are made from graphite foil. In set TA-28-I gasket is made from graphite laminate KlingerGraphite type SLS (see desc. here), but for sets TA-28-III .. TA-28-IX KlingerGraphite type PSM is used (see desc. here).

In sets type A, B, H all washers are made from KlingerSil plate type C-4430 (see desc. here), but gaskets are made from graphite laminate KlingerGraphite type SLS (see desc. here).


It is good to know, that the role of the mica shield installed on the outside (ie, on the side of the viewer) is to reduce the thermal shock to which gauge glass is exposed, working on the one hand, in an environment of high temperature (steam, hot water), and on the other, with a low (room) temperature environment. Outer mica shield helps to a longer faultless operation of the set. The hole made in the shield, protects against moisture staying between the glass and mica while mounting assembly and relieves pressure above and below the shield during normal operation.

set of elements:  
installation guide:  

We offer transparent glass meet the following standards:

  • ÖNORM M 7354 (Austrian standard)
  • DIN 7081 (German standard)
  • JIS B 8211 (Japanese standard)
  • ÖMV-Spez. H 2009 (Austrian factory standard of the petrochemical concern ÖMV-AG, Vienna)
  • MIL-G-16356 D (regulations the US Navy)
  • Esso Eng. Spec. 123 (Esso Research and Engineering Co. - New Jersey)
  • S.O.D. Spec. 123 (Standard Oil Development Company - New Jersey)
  • BS 3463 (British Standard)

We also provide glass unusual: manufactured according to individual customer technical requirements, custom sizes and custom shapes.

Scope of application:

  Type AType BType HType TA 28 3)
For soft environment,  not affecting aggressive on the glass ie. oils, hydrocarbons, etc. 240 120 290 120 340 120 - -
160 400 800 400 230 400 - -
0 - 10 430 0 - 10 430 0 - 10 430 - -
For aggressive environment acting on the glass, eg. saturated steam, hot water, alkalis 35 1) 243 35 1) 243 42 1) 253 120 2) 324
70 300 85 300 85 300 180 356

1) For steam pressures above 35 bar is recommended to use mica shields.
2) For steam pressures above 120 bar can be used only glasses TA-28-I.
3) Glass type TA 28 can be used only with mica shields.


Dimensioning gauge glasses
I 115 30 17 115 34 17 - - - 113 27,6 16,8
II 140 30 17 140 34 17 140 34 22 - - -
III 165 30 17 165 34 17 165 34 22 163 27,6 16,8
IV 190 30 17 190 34 17 190 34 22 188 27,6 16,8
V 220 30 17 220 34 17 220 34 22 218 27,6 16,8
VI 250 30 17 250 34 17 250 34 22 248 27,6 16,8
VII 280 30 17 280 34 17 280 34 22 278 27,6 16,8
VIII 320 30 17 320 34 17 320 34 22 318 27,6 16,8
IX 340 30 17 340 34 17 340 34 22 338 27,6 16,8
X - - - 370 34 17 - - - - - -


Note: transparent level gauge glasses are  supplied in sets with gaskets and mica shields or separately.

You can download the above information in the form of a PDF file.

If you can not find the size - please contact us.

While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

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