Abstract: There is provided a multilayer structure comprising a layer (A) containing an ethylene-vinyl alcohol copolymer having an ethylene unit content of 1 mol % or more and less than 20 mol %, a viscosity-average polymerization degree of 200 to 5000, and a saponification degree of 80 to 99.7 mol %, wherein a block character of ethylene units is 0.90 to 0.99; and a layer (B) containing at least one resin selected from the group consisting of a polyolefin resin, a polyester resin and a polyamide resin. Such a multilayer structure has excellent oxygen-gas barrier performance. In addition, an aqueous solution containing the ethylene-vinyl alcohol copolymer exhibits excellent viscosity stability even after long-term storage. Therefore, even after a long period of time from preparation of the aqueous solution, it can be uniformly applied to a substrate and thus, a multilayer structure having excellent oxygen-gas barrier performance can be provided.

Abstract: A recorder includes a wireless gateway unit built in the recorder, the wireless gateway unit being configured to wirelessly communicate with a field device, the wireless gateway unit converting between an internal communication protocol used for the internal communication of the recorder and a protocol used for the wireless communication. The recorder may further include a control unit that processes data from the field device. The wireless gateway unit is configured to internally communicate with the control unit. The wireless gateway unit collects the data from the field device to transmit to the control unit.

Abstract: A recorder includes a wireless gateway unit built in the recorder, the wireless gateway unit being configured to wirelessly communicate with a field device, the wireless gateway unit converting between an internal communication protocol used for the internal communication of the recorder and a protocol used for the wireless communication. The recorder may further include a control unit that processes data from the field device. The wireless gateway unit is configured to internally communicate with the control unit. The wireless gateway unit collects the data from the field device to transmit to the control unit.

Abstract: The present invention is characterized by the following. Data for administrating equipment and measurement results are prepared prior to measurement of the prescribed input signal, measurement files consisting of measurement results are prepared and recorded on a storage medium during measurement, and a digital signature is affixed to these files after measurement. These characteristics enable the data to be handled as official data enabling restriction of access to the equipment and measurement data, operation logs and records of measurement conditions, and writing of signatures.