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Summary of Contents for YOKOGAWA SMART 920
- Page 1 User’s Manual SMART 920 Antenna Installation User’s Manual IM 04L51B01-44EN 1st Edition...
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Page 2: Introduction
Wireless Input Uint User’s Manual maintenance of the GX70SM and the wireless input unit function of the GX20 (/CM2)/GP20 (/CM2) Paperless Recorders and GM10 (/CM2) Data Acquisition Unit. 1st Edition: January 2025 (YK) All Rights Reserved, Copyright © 2025, Yokogawa Electric Corporation IM 04L51B01-44EN... -
Page 3: Notes
However, should you have any questions or find any errors, please contact your nearest YOKOGAWA dealer. ● Copying or reproducing all or any part of the contents of this manual without YOKOGAWA’s permission is strictly prohibited. QR code The product may have a QR Code pasted for efficient plant maintenance work and asset information management. -
Page 4: Trademarks
Trademarks ● SMARTDAC+ and UTAdvanced are registered trademark or trademark of Yokogawa Electric Corporation. ● Adobe and Acrobat are registered trademarks or trademarks of Adobe Systems Incorporated. ● Company and product names that appear in this manual are registered trademarks or trademarks of their respective holders. ● The company and product names used in this manual are not accompanied by the registered trademark or trademark symbols (® and ™). Revisions 1st Edition January 2025 How to Use This Manual This chapter describes the antenna installation of 920 MHz wireless communication. -
Page 5: Table Of Contents
Contents Introduction ..............................i Notes ................................ ii QR code ..............................ii Trademarks ..............................iii Revisions ..............................iii How to Use This Manual ..........................iii Conventions Used in This Manual ......................iii Common Items Related to Antenna Installation ............1 Antenna Orientation..........................1 Antenna Installation Position ........................2 Preventing Interference Between Antennas ..................... -
Page 6: Common Items Related To Antenna Installation
Common Items Related to Antenna Installation Antenna Orientation Matching the Polarization Planes of Radio Signals on the Transmitting Side and the Receiving Side The category of the antenna is Non-directional one, but radio signals have polarization planes (Refer to Figure 1.). To match the polarization planes of the antennas, each antenna should basically be installed with its direction perpendicular to the horizon plane. -
Page 7: Antenna Installation Position
Common Items Related to Antenna Installation Antenna Installation Position The ideal arrangement is for communicating antennas to be positioned where there is a clear line of sight between them, with no obstacles between them and sufficient open space. Spatial illustration of radio signal transmission Outdoor d=5.0 m or more Indoor d=2.0 m or more... - Page 8 Common Items Related to Antenna Installation ● Do Not Install Antennas Between Equipment Do not install antennas between equipment that could obstruct radio signal transmission, such as storage cabinets, refrigerators, freezers, or machine tools. Between equipment ● Eliminate the Height Difference Between Antennas Over Close Distances on the Transmitting Side and Receiving Side (antennas at a close distance) When the antennas on the transmitting side and receiving side are positioned at a close distance and there is a height difference of several meters between them, the polarization planes of the antennas do not actually match even if you adjust their polarization planes.
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Page 9: Preventing Interference Between Antennas
Common Items Related to Antenna Installation Preventing Interference Between Antennas If antennas are too close to each other, radio interference affects communication. Provide an appropriate distance between the antennas. 1 The positions where the coordinator and repeater are installed must be appropriate for all routers/wireless input units to be connected, and the surrounding environment should have minimal impact from reflected waves. -
Page 10: Sleeve Antenna
Sleeve Antenna This antenna is directly connected to a device. Because there are no cable, there is no signal strength (RSSI) drop due to cables, as might occur when using rooftop antennas. The antenna is not waterproof. When installed outdoors, the antenna must be contained in a plastic case or other such a protector that allows radio signals to pass through. - Page 11 UT32A/MDL Digital Indicating Controller (DIN Rail GS 05P01D81-43EN Mounting and Wireless Communication Type) UPM100 Model UPM100 Universal Power Monitor GS 77C01H01-43EN 1 For the US 2 For the Republic of Korea You can download the latest general specifications from the following website. http://www.yokogawa.com/library IM 04L51B01-44EN...
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Page 12: Roof Top Antenna
Roof Top Antenna This antenna is provided with a cable (coaxial, 2.5 m in length). Use it when installing the antenna at a position away from the device. An antenna extension cable can be connected. Only one extension cable of 2.5 m or 7.5 m can be connected. To Ensure that the Antenna Functions Properly, Pay Attention to the Following Points when Installing It. -
Page 13: Extension Cable For Tooftop Antennas
Extension Cable for Tooftop Antennas Two lengths are available: 2.5 m and 7.5 m. Using an extension cable allows you to install the antenna at a position with clear line of sight, thereby improving communication conditions. However, using an extension cable with reduce signal strength due to cable loss. The longer the cable, the greater the cable loss. -
Page 14: Antenna Installation Check Sheet
We have prepared a sample check sheet (Excel sheet) for antenna installation. (The following is an image.) You can modify and use it to suit your antenna installation. You can download it (in ZIP format) from the instruction manual on the product page of SMART 920. https://www.yokogawa.com/ns/smart920/ Roof Top Antenna... -
Page 15: Lnformation
lnformation Impact of obstacles In a space without obstacles between communicating antennas, radio signals are transmitted as direct waves. When obstacles are present, reflected waves, transmitted waves, and diffracted waves are generated, affecting the radio signal transmission. The impact of obstacles on communication varies depending on their arrangement, arrangement density, material thickness, as well as the type of material. -
Page 16: Impact Of Antenna Cable Length On Attenuation, Fresnel Zone
lnformation Impact of Antenna Cable Length on Attenuation, Fresnel Zone Attenuation Due to Antenna Cable ● Radio signal strength attenuates by 1 dB for every 1 m of antenna cable. ● Rooftop antennas come with a 2.5 m antenna cable, resulting in a 2.5 dB weaker signal strength compared with sleeve antennas. When both the transmitting and receiving antennas are rooftop antennas, the signal strength weakens by 5 dB compared to when both antennas are sleeve antennas. ● Using an additional 2.5 m extension cable will further reduce the signal strength by 2.5 dB, and using a 7.5 m extension cable will further reduce it by 7.5 dB. -
Page 17: Multipath Fading
In actual practice, due to the varied installation environments, it is difficult to predict when communication interruptions due to multipath fading or other causes will occur. SMART 920 has a multi-hop function that switches to another repeater in the event of communication interruption. To prevent long-term communication interruptions, we recommend planning the placement of repeaters in consideration of multi-hop.
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