When you order a McDaniel Filled 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 32 DEGF undiluted. The
mixture of distilled water in proportions up to 35% will lower the limit
commensurately, to -40 DEGF.
Silicone can extend the lower temperature limit to -60 DEGF. 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 loose its elasticity.
Warning: Glycerin filled gauges should not be used in applications involving strong
oxidizing agents such as chlorine, nitric acid or hydrogen peroxide.
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