| 摘要 |
In measurement of the temperature of a gas in a space by means of a pyrometer (10) having a thermal sensor, especially a thermocouple (23), for generating a gas temperature dependent, electrical signal, and a radiation screen (11, 12, 16, 17, 27), the gas is passed from the space via a gas inlet (13, 14) past the thermocouple (23) and on to a gas outlet (21) without gas being sucked from the space, as the gas flow is generated by the generation of a relative low pressure at the gas outlet (21) by discharging pressurized air from a nozzle (20) which is preferably arranged at the radiation screen of the pyrometer. The pressurized air is supplied from a pressurized air source arranged outside the space and is passed to the nozzle (20) via a pressurized air conduit (19). In such a pyrometer gas temperatures in the order of 900-1200 DEG C may be measured continuously for an even extremely long period (more than 1000 hours) merely by generating a flow velocity past the thermocouple in the order of 30-50 m/s by the supply of an amount of pressurized air in the order of 15-100 l/min. The components of the radiation screen are made of heat resistant materials, such as high temperature resistant stainless steel, quartz glass or a ceramic material. |
