Development of an Al-load-cell-based wireless ringer's solution monitoring and alarm system: insight into vibrational error correction
10.1007/s13534-019-00107-x
- Author:
Hyun Seok MOON
1
;
Eue Soon JANG
Author Information
1. Department of Applied Chemistry, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 39177, Republic of Korea. euesoon@kumoh.ac.kr
- Publication Type:Original Article
- Keywords:
Wireless Ringer's solution monitoring and alarm system;
Al load cell;
Wheatstone bridge;
Static analysis;
Modal analysis;
Harmonic analysis;
Vibrational error
- MeSH:
Vibration
- From:
Biomedical Engineering Letters
2019;9(2):245-255
- CountryRepublic of Korea
- Language:English
-
Abstract:
In this study, we developed an aluminum-load-cell-based wireless Ringer's solution monitoring and alarm (WRMA) system. The Al load cell was designed with a rectangular shape, and the load was concentrated in the lower beam part of the load cell because of the anisotropic thickness. From the static analysis, we identifi ed the appropriate location for a Wheatstone bridge circuit consisting of four strain gauges. In addition, the modal and harmonic analyses showed that the vibrational frequencies of the hospital environment do not seriously interfere with the output voltage of the Al load cell. However, random vibrations generated by the movement of the WRMA system on various surfaces severely increase the standard deviation of the measured solution weight by ± 10 g or more. Such vibrational error is too large because the average weight of Ringer's solution is 30–40 g at the time of replacing Ringer's solution. Thus, this error could be confusing for nurses and result in mistakes in the timely replacement of the Ringer's solution. However, the standard deviation of the measured weight was dramatically reduced to ± 3 g or less by using the vibration correction algorithm developed in the present study.
