Resistance thermometers platinum standard POINT-25 - working standards of the 1st, 2nd category (hereinafter - resistance thermometers) according to GOST 8.558-2009 are designed to measure the temperature of liquid and gaseous media during calibration and calibration of temperature measurement instruments.
Main technical characteristics:
|Name of characteristics||Value|
|Executions||1-th digit||2-nd digit|
|Temperature measurement range, °C||from -196 to +660,323|
|Rated resistance at 0 °C, Ohm||25±1|
|Instability of thermometers in the triple point of water after annealing at a temperature of 10 °C above the upper limit of measurement, °C, no more||±0,001||±0,002|
|The ratio Of WGA resistance of thermometers at the melting point of gallium to their resistance at the triple point of water, not less||1,11807||1,11795|
|Confidence limits of absolute error at probability 0.95, °C, no more at temperature: in the range from -196 °C to + 0.01 °C||±0,01||±0,05|
|Electrical insulation resistance between the terminals and the body of thermometers at ambient temperature from +15 °C to +25 C and relative humidity from 30 to 80 %, MW, not less||100|
|Overall dimensions, mm, not more|
|The diameter of the protective tube||8|
|Diameter of thermometer head||40|
|The length of the Assembly part||800|
|Weight, g, not more||200|
|Operating conditions: ambient temperature, °C relative humidity, % atmospheric pressure, kPa||from +15 to +25
from 30 to 80
from 84 to 106
The average time between failures – 1000 hours.
The average service life is 5 years.