2
PENBERTHY
SERIES U FLAT GLASS GAGES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
2 INTRODUCTION
Penberthy liquid level gages are used to allow
direct visualization of liquid level in vessels.
By peering through the glass, it is possible
to monitor color, clarity and level of a gas/
liquid interface. Gages are available in varying
lengths and configurations (end connect, side
connect, multiple sections, NPT or flange
connections, etc.). Visual indication can be
enhanced by using illuminators (accessory).
The design of Penberthy Series U liquid level
gages is such that the gage covers are bolted
directly to the liquid chamber with solid metal-
to-metal contact. All clamping forces are
withstood by the steel components of the gage,
thereby relieving stress concentrations on the
gage glass.
2.1 System description
Penberthy gages comprise six basic
components. Each component may vary
slightly, depending on the desired physical and
mechanical properties for the gage. Use the
exploded parts view in Section 11 as additional
reference material.
3 AVAILABLE MODELS
Penberthy ultra high pressure (Series U) liquid
level gages are designed for applications other
than steam/water, requiring a pressure rating
higher than that of Penberthy Series H liquid
level gages.
TABLE 1
Gasket material
Glass size
Model TU transparent
Wetted parts material steel or stainless steel w/B7 bolting
Buna-N (NBR) w/302
STS retainer (standard)
1, 3, 4, 5, 7
6000 psig (41370 kPa) at -20°F (-29°C) to 250°F (121°C)
FKM (Viton
®
) w/302 STS
retainer
1, 3, 4, 5, 7
6000 psig (41370 kPa) at -20°F (-29°C) to 400°F (204°C)
PTFE (Teflon
®
) (special
chamber required)
1, 3, 4, 5, 7
6000 psig (41370 kPa) at -20°F (-29°C) to 500°F (260°C)
NOTE
Lower temperatures are possible with metallic material variation. (e.g., 316 stainless construction, PTFE
(Teflon
®
) gaskets/cushions usable to -325°F [-198°C]).
To determine the maximum allowable working pressure for a specific temperature within the
design limits stated in the table, the user should refer to applicable technical data sheets or,
when provided, the specifically stated design limits on a product proposal.
WARNING
NEVER exceed these design ratings or application data. Exceeding design ratings or application data
may result in mechanical failure of gage components resulting in death, serious personal injury and
property damage.
Chamber:
provides a pressure retaining
metallic channel for the liquid to enter and be
viewed. Slot(s) are machined into the chamber
to provide direct visualization of the process
fluid.
Gaskets:
seal the gap and prevent leakage
between the chamber and the glass. Gaskets
are available in a variety of materials for
compatibility with the media in the gage.
Glass:
allows for visual observation of the
process fluid in the chamber.
Cushion:
acts as a protective buffer between
the glass and the cover.
Cover:
protects the glass assembly from
external hits and provides a flat, rigid surface
that is used to compress the gage assembly
evenly.
Bolting:
compresses the chamber between
the covers.
3.1 Design ratings at maximum and minimum operating temperatures
