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The RangeIR™ Liquid Analyzer is optimized for fast, easy, and accurate infrared measurements of liquids, pastes, and gels at controlled temperatures up to 175°C. The RangeIR™ may also be used to study reactants and reaction products in liquids at elevated temperatures. Further, this equipment is extremely convenient for studying dissolved or suspended species by using elevated temperatures to volatilize an otherwise interfering solvent.
The RangeIR™ is a trough-style single-reflection ATR FTIR accessory. It requires the use of Harrick's Low-Voltage Temperature Controller and is based on our time-proven FastIR™. With the SuperCharged™ ZnSe crystal, this design has the highest optical throughput (>85%) of any ATR accessory. Its simple optical configuration, consisting of only two fixed flat mirrors and a triangular prism ATR crystal, provides optimum performance without the need for sensitive optical alignment adjustments. The design is inherently stable, an essential feature for operation of a system used at the extreme temperatures simulating processing conditions.
The RangeIR™ utilizes a trough configuration to simplify sample introduction and crystal cleaning. This configuration is required to contain substances which have low viscosities at elevated temperatures.
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The two 24V cartridge heaters, in thermal contact with the crystal mounting plate, are operated by our low-voltage temperature controller. Two thermocouples are provided, one in the sample and one in contact with the ATR crystal, to enable cascade operation of the temperature controller. Cascade control is necessary at higher temperatures because the lag between the heater and sample temperatures can cause the controller to otherwise overshoot the set point, potentially resulting in damage.
When studying heat-induced changes in liquids, it is important to precisely and accurately know the sample temperature. The RangeIR™ measures and controls the sample temperature directly, instead of recording the crystal or heater temperature, as is commonly done by other ATR accessories. This is important because the sample is exposed to a different thermal environment and hence is at a slightly lower temperature. With the RangeIR™, the sample thermocouple is placed directly into the sample, providing the true value (and control) desired.
The RangeIR™ incorporates easily adjustable and highly stable kinematic mounting, for optimum alignment in the particular spectrometer being used. In addition, the RangeIR™ is equipped with Harrick's patented PermaPurge™. This allows samples to be exchanged without interrupting the purge of the FTIR spectrometer, which, in turn, greatly enhances sample throughput.
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