BATH CIRCULATOR continued
• Measuring Method: The built-in temperature sensor and its digital display are compared to a separate calibrated reference temperature device, such as a calibrated thermometer. Measuring conditions must be recorded in detail as reference conditions. The reference thermometer should be placed into or as close as possible to the sample. The further away the thermometer is from the sample, the larger the deviation between the measured and the actual temperature can be. This is a physical disturbance caused by the fact that, depending on the arrangement of the samples in the bath, the circulation and therefore the mixing of the heat transfer medium in the bath may vary.
• Measuring Device: The reference thermometer (or calibrated reference temperature device) must have defi ned properties that are traceable, i.e., traceable calibration, and a calibration certifi cate should be kept on record.
• Control Point: The control point describes the exact place in a temperature control circuit or temperature-controlled bath in which the temperature stability and temperature are measured with a reference thermometer.
• Documentation and/or Optional Adjustment of the Displayed Temperature: Results should be documented as follows:
1. Temperature stability as a +/- (°K) value around the respective actual temperature.
2. Either the deviation from the actual temperature in +/- degree, referencing displayed value on the bath, or note that a single- point calibration was performed and the temperature at which it was performed. In the case of Thermo Scientifi c ARCTIC, GLACIER and SAHARA bath circulators, a correction value can be added to or subtracted from the displayed temperature so that it matches the reference thermometer. This feature is called real temperature adjustment (RTA) and is, in eff ect, a single-point calibration that can be set and saved for up to fi ve setpoint temperatures. In all instances, the corrective value must be recorded.
3. The measurement uncertainty (accuracy) of the reference thermometer used.
Establishing a testing and calibration procedure is not very complex, but it can only be carried out onsite and under real conditions, and must be adjusted to the requirements of each particular application. Therefore, such a test cannot be conducted by the equipment manufacturer or performed off site.
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