Platinum Resistance Thermometers
Standard platinum resistance thermometers satisfying the requirements of the ITS-90 may be calibrated at the appropriate fixed-points. For such calibrations it is necessary that the sensor element be mounted and sealed in a glass sheath so that the distance from the tip of the element to the bottom of the head of the thermometer is at least 450 mm, and the diameter of the glass sheath should not be greater than 8 mm.
Industrial platinum resistance thermometers designed for use as lower grade standards than those satisfying the requirements of the ITS-90 are calibrated by comparison with Laboratory standards.
The resistance ratios of the platinum resistance thermometer at the measuring temperatures will be determined and fitted to a polynomial. The coefficients of the polynomial will be reported.
Calibration charges
| Fee in HK$ | |
|---|---|
| Calibration at one temperature. |
$2880 |
| Calibration at each additional temperature. | $690 |
| Additional charge, if any of the above test temperatures exceed 230 ¢J | $980 |
| Calibration at triple point of argon. | $5930 |
| Calibration at triple point of mercury. | $2880 |
| Calibration at triple point of water. | $2880 |
| Calibration at melting point of gallium. |
$2880 |
| Calibration at freezing point of indium. |
$5930 |
| Calibration at freezing point of tin. |
$5930 |
| Calibration at freezing point of zinc. |
$5930 |
| Calibration of freezing point of aluminium. |
$7420 |
| Calibration at freezing point of silver. | $7420 |
