Title:
HALOGEN GAS LEAK DETECTOR
Document Type and Number:
Japanese Patent JP3024388
Kind Code:
B2
Abstract:
PURPOSE: To simplify a device and calibration work by inputting the signal of a pressure gauge to an operation part to correct the value of a calibration signal on the basis of the pressure signal and inserting a probe in a calibration device and providing a switch for changing over the measuring signal of a detector and the signal at the time of calibration.
CONSTITUTION: A calibration device is incorporated in a detector and the signal of a pressure gauge is inputted to an operation part 26 as shown by a dotted line B. At the time of calibration, a probe 28 is inserted in the calibration port 50 of the calibration device. A stepped part is formed in the vicinity of the probe 28 and the end part of a body and the probe 28 is always opposed to one end of a capillary at a constant distance G to press a contact point coil spring. The probe 28 and the contact point coil spring constitute the switch of measuring and calibration modes in the operation part 26. A constant amt. of calibration gas flows out of a calibration gas cylinder 41 through a stop valve 52, a pressure reducing valve 53 and the capillary and calibration can be performed only by inserting the prove 28 in the calibration port 50 at the time of calibration and the device can be also simplified.
Inventors:
Shozo Nakano
Shigeo Yasuda
Shigeo Yasuda
Application Number:
JP25283892A
Publication Date:
March 21, 2000
Filing Date:
September 22, 1992
Export Citation:
Assignee:
Yokogawa Electric Corporation
International Classes:
G01M3/20; G01M3/02; G01N27/00; G01N27/26; G01N27/62; (IPC1-7): G01M3/20; G01N27/62
Domestic Patent References:
| JP5940137A |
Attorney, Agent or Firm:
Masayasu Watanabe