Penberthy RL & TL Direct Reading Liquid Level Gauges

Penberthy RL & TL Direct Reading Liquid Level Gauges provide a clear, mechanical liquid level reference for low-pressure process applications. These flat glass gauges help operators view liquid levels directly as the fluid rises and falls inside the gauge chamber. They require no electrical power, so they work well in remote sites and areas where power interruptions may affect other instruments.

The RL model uses a reflex-style viewing design. The TL model uses a transparent-style viewing design that allows operators to see the level and liquid characteristics. Both models support low-pressure liquid level measurement in petroleum, chemical, and general process applications. They are not recommended for steam/water applications.

Westech Industrial supplies Penberthy RL & TL direct reading level gauges in Western Canada, including British Columbia, Alberta, and Saskatchewan. Our team can help with product selection, application review, service support, and integration with broader level measurement solutions. Westech also supports projects with custom fabrication capabilities, including panels, analyzer shelters, sample systems, and integrated industrial solutions.

Penberthy RL & TL Direct Reading Liquid Level Gauges

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Description

Clear Direct Level Indication

Penberthy RL & TL direct reading level gauges give operators a simple visual reference for liquid level. Because the operator views the process fluid through flat glass, the gauge provides an easy-to-understand indication without relying on power, electronics, or signal interpretation. This makes the gauge useful for local confirmation, field checks, and verification of other level technologies.

Reflex and Transparent Viewing Styles

The RL model uses a reflex-style design with one vision slot. Light reflects differently above and below the liquid level, which helps operators identify the interface between the liquid and gas space. This style provides a strong visual contrast for many common process applications.

The TL model uses a transparent-style design with vision slots on both sides of the chamber. Light enters from the opposite side, allowing operators to view both the level and the liquid characteristics. As a result, the TL model can help when teams need to see colour, clarity, or interface conditions. Illuminators can also improve visibility in darker locations.

Reliable Operation Without Electrical Power

These gauges do not require electrical power. Therefore, they can provide direct liquid level measurement in remote areas or during power interruptions. In addition, their operation remains independent of many liquid characteristics. Multiple liquids can move through the same vessel without concerns related to density, surface turbulence, dielectric conductivity, or similar variables.

Low-Pressure Flat Glass Construction

The RL and TL models use ductile iron covers with carbon steel or stainless steel chambers. They also use tempered borosilicate glass rated to 600°F. This construction supports low-pressure applications where users want a practical and economical level reference. The standard flat gasket seat also helps simplify gasket residue removal during rebuilds.

Configurable for Different Installations

Penberthy RL & TL gauges support end or side connections. Connection options include threaded, socketweld, and flanged styles. The gauges also support glass sizes 1 through 9 and visible lengths from 3¾ inches to 139¾ inches. As a result, users can select a configuration that fits the vessel, viewing needs, and installation layout.

Options for Protection and Visibility

Transparent TL gauges can use optional shields to help extend glass life in corrosive environments. Frost-proof extensions can help reduce frost buildup over the viewing area in low-temperature service. Gauge scales can also attach to the cover, giving operators a graduated readout in standard units.

For offshore or corrosive environments, optional offshore coating 2600 protection can provide an additional protective option. NACE wetted materials also support sour gas service requirements when the application calls for them.

Applications

Penberthy RL & TL direct reading level gauges support low-pressure liquid level measurement where operators need a local visual reference. They suit applications where teams need straightforward level confirmation, process visibility, or verification of other level instruments.

  • Petroleum process applications
  • Chemical processing
  • General process industries
  • Remote sites without reliable power
  • Liquid level verification applications
  • Applications requiring visual inspection of liquid characteristics with TL gauges
  • Sour gas service when selected with NACE wetted materials
  • Corrosive environments when selected with suitable materials, coating, or shields

Documents

PENBERTHY_RL & TL Direct Reading Liquid Level Gauges_Data Sheet_July2026_Westech.pdf

PENBERTHY_RL & TL Direct Reading Liquid Level Gauges_IOM_July2026_Westech.pdf

Manufacturer Info

Penberthy is a trusted process instrumentation manufacturer known for direct reading liquid level gauges, flat glass gauges, gaugecocks, and related accessories. Its products support petroleum, chemical, natural gas, and general process applications where reliable visual level indication is required.

Website: https://www.penberthyprocess.com/

SPECS

Product:
Penberthy RL & TL Direct Reading Liquid Level Gauges.
Gauge Type:
Low-pressure flat glass direct reading liquid level gauges.
Model RL:
Reflex style gauge.
Model TL:
Transparent style gauge.
General Use:
Low-pressure direct reading liquid level measurement.
Not Recommended For:
Steam/water applications.
Cover Material:
Ductile iron.
Chamber Materials:
Carbon steel or stainless steel.
Gaskets and Cushions:
Grafoil/Mylar.
Glass:
Tempered borosilicate glass rated to 600°F.
Glass Sizes:
1 through 9.
Visible Length:
3¾ inches to 139¾ inches, or 95 mm to 3550 mm.
Connections:
End or side connections.
Connection Types:
Threaded, socketweld, or flanged.
RL Maximum Pressure Rating:
Glass size 1: 2400 psig (165 barg); glass size 9: 1800 psig (124 barg).
TL Maximum Pressure Rating:
Glass size 1: 2000 psig (138 barg); glass size 9: 500 psig (34 barg).
Temperature Range:
-20°F to 600°F, or -29°C to 316°C.
Vacuum Service:
Suitable for full vacuum applications.
Accessories:
Gaugecocks, illuminators, insulation blankets, heating/cooling chambers, frost-proof extensions, and gauge scales.
Protective Options:
Offshore coating 2600 protection and optional shields for transparent gauges.
Sour Gas Options:
NACE wetted materials available.
Approval:
FM approved.
Availability:
Available through Westech Industrial in Western Canada: BC, AB, and SK.

Related products

PRODUCT FAQ's

What is the difference between the Penberthy RL and TL gauges?
The RL model uses a reflex viewing style with one vision slot. It provides strong level contrast for many liquid applications. The TL model uses a transparent viewing style with two vision slots. It allows operators to view level, colour, clarity, and certain interface conditions.
Do Penberthy RL & TL direct reading level gauges need electrical power?
No. These gauges provide direct mechanical level indication without electrical power. This makes them useful for remote sites, local indication, and backup verification.
Can these gauges help verify other level technologies?
Yes. Direct reading level gauges can provide a local visual reference for checking other level instruments. Operators can compare the gauge reading with other level measurement devices.
Are Penberthy RL & TL gauges suitable for steam/water applications?
No. These models support low-pressure liquid level measurement in non-steam/water applications. For steam/water service, Westech can help review more suitable level gauge options.
Can Westech Industrial help select the right configuration?
Yes. Westech Industrial can help customers in BC, Alberta, and Saskatchewan review model style, visible length, materials, connections, accessories, and application requirements. Our service team can also support customers with related level measurement needs.
Does Westech offer custom fabrication for related projects?
Yes. Westech supports projects with custom fabrication capabilities and integrated industrial solutions. Our team can assist with panels, analyzer shelters, sample systems, and related fabricated assemblies when the project requires a broader solution.