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1. 发明专利

JPH01295147A DEW POINT MEASURING METHOD AND APPARATUS FOR WATER VAPOR 失效
公开(公告)号：JPH01295147A
公开(公告)日：1989-11-28
申请号：JP30236888
申请日：1988-12-01
申请人： ENDRESS HAUSER GMBH CO
发明人： RAINAA HERUMAN , DEIITAA FUNKEN
IPC分类号： G01N25/68 , G01N27/22
摘要： PURPOSE: To measure the dew point accurately even on a contaminated sensor surface regardless of the type and extent of contamination by compensating for the action of contamination automatically. CONSTITUTION: A measurement detector 10 comprising a sensor element 12 fixed onto a Pettier effect element 14 and a temperature sensor 16 is arranged in a process. A humidity signal from the sensor element 12 forms a sensor capacity signal through an impedance evaluation circuit 20 while a temperature signal from the temperature sensor 16 forms the surface temperature signal of the sensor element 12 through a temperature evaluation circuit 22 and both signals are fed to a microcomputer 30. The microcomputer 30 compares the sensor temperature with a target temperature and delivers a temperature control signal to the Peltier effect element 14 thus keeping the sensor temperature constantly at a dew point. According to a program routine presented at a function block 38 of the microcomputer 30, a capacity being used as a guide amount for temperature regulation is regulated automatically to match the sensor capacity at the dew point accurately and contamination of the sensor is compensated automatically.

2. 发明专利

JPH0512661B2 失效
公开(公告)号：JPH0512661B2
公开(公告)日：1993-02-18
申请号：JP14706488
申请日：1988-06-16
申请人： ENDRESS HAUSER GMBH CO
发明人： RAINAA HERUMAN , DEIITAA FUNKEN
IPC分类号： G01N27/06 , G01N25/66 , G01N25/68 , G01N27/00

3. 发明专利

JPS649352A DEW POINT SENSOR 失效
公开(公告)号：JPS649352A
公开(公告)日：1989-01-12
申请号：JP14706488
申请日：1988-06-16
申请人： ENDRESS HAUSER GMBH CO
发明人： RAINAA HERUMAN , DEIITAA FUNKEN
IPC分类号： G01N27/06 , G01N25/66 , G01N25/68 , G01N27/00
摘要： PURPOSE: To enable a dew-point sensor to detect the condensation which occurs immediately after the temperature reaches the dew-condensation temperature and to eliminate the influence of the surface contamination of the sensor by adjusting the intervals between the teeth of two electrode structures equal to or smaller than the diameter of the largest condensed water drop formed when the temperature reaches a dew point. CONSTITUTION: A dew-point sensor 10 is provided with a sensor surface 18 which is exposed to a gas to be measured from which steam is condensed when the gas is cooled to its dewpoint temperature and two electrode structures 20 and 30 having teeth 22 which are respectively coated with moitureinsensible insulating layers 40 and arranged in parallel at regular intervals on the surface 18 as electrode sections. Since the intervals 42 between the parallel teeth 22 of the structures 20 and 30 must be designed properly so that the intervals can correspond to the diameter of the water drop formed during the shortest period of time, the intervals are formed to

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