FLUKE 5017 Silicone Oil Type 710

　　典型应用 用作热传导液，液压减震器油以及暴露于核辐射条件下的工作场合。

　　It’s important to understand a few specifications before selecting a bath fluid. We’ve seen bath fluids advertised with a temperature range that spans from the freezing point to the flash point or beyond.

　　For example, type 710 silicone oil has a freezing point of –22°C, but freezing point has nothing to do with the point at which the oil becomes so thick it cannot be properly stirred. Type 710 oil should really only be used down to about 80°C. It’s a viscosity issue, not a freezing-point issue. Usable range is the question. Suitability for calibration work is the specification that counts.

　　The usable viscosity range is determined by your bath’s stirring or pumping design. Fluke Calibration baths can be operated using fluids with up to 50 centistokes viscosity. This gives you additional usable range in the lower temperature levels of the fluid.

　　Some baths advertised as calibration baths require fluids with 10 centistokes or less viscosity to operate properly. The usable ranges in our table on the previous page assume the use of a Fluke bath.

　　In addition to range and viscosity issues, there are a number of other issues to consider when choosing a bath fluid. The other considerations are:

　　Thermal characteristics

　　Lifetime

　　Change in characteristics due to temperature cycling

　　Absorption of water from the air

　　Vaporization—fumes and fume hood requirements

　　Expansion due to heat

　　Contamination—mixing oils or introducing contamination with unclean probes

　　Conductivity properties

　　Effects of using fluids outside of their range—fire, explosion, polymerization

　　Effects of altitude on boiling point