A method for removal of dissolved oxygen from organic liquids by use of a solid state catalyst. The image is decomposed into coefficient values of a plurality of frequency bands by a frequency-component decomposition circuit to obtain coefficients of each and every frequency band. The described measurement system and method, for example, can perform highly accurate measurements and can be a fault tolerant system providing high reliability. Extension of the cylinders during detaching the masts from the vertical plates causes the opened latch hooks to be pivoted to the extent that the biasing elements move over center and reset the latches to their closed positions, which positions are conducive for automatically reattaching the mast to the vertical plates.