When you order a McDaniel fillable gauge you may
choose to fill it yourself or you may order it factory-filled with the liquid of your
choice. Thus you can maximize inventory utility and
minimize inventory cost.
Glycerin filling has a lower operating temperature limit of
undiluted. The mixture of distilled water in proportions up to 35% will lower the
limit commensurately, to -40ºF (-40ºC).
Silicon can extend the lower temperature limit to
The maximum temperature limit is not determined by
the fluid but by the gauge's synthetic case seal. At elevated temperatures the seal
may bake and lose elasticity.
Glycerin filled gauges should not be used in applications involving strong
oxidizing agents such as chlorine, nitric acid or hydrogen peroxide. (Refer to ASME B40.1)