DPM Two Modes Equipped with Thermohygrometer and Pressure Selection
Abstract
Calibration is a technical activity involving the determination and specification of one or more properties and characteristics of a product, process, or service according to established specific procedures. The Digital Pressure Meter (DPM) is an instrument used to measure both positive and negative pressures in medical devices. The purpose of developing the Dual-Mode Digital Pressure Meter (DPM), equipped with a thermohygrometer and pressure selection (positive pressure), is to create a more informative, effective, and accurate blood pressure monitoring device. The research contribution lies in a system that utilizes a blow pressure sensor, with measurement results converted to kilopascals (kPa) and displayed on a 2.4-inch TFT Nextion LCD. To ensure proper system operation, the blow pressure must align with the specific requirements of the blood pressure cuff. The MPX 5050GP serves as the positive pressure sensor, with a maximum pressure requirement of 300 mmHg. Additionally, a DHT22 sensor monitors temperature and humidity. The device is further equipped with a leak test timer. During six measurements using a mercury sphygmomanometer, the smallest recorded pressure was 0 mmHg at zero pressure, while the highest was 298.0 mmHg at 300 mmHg. The largest average deviation is attributed to pressure leaks between the module’s output hose and the connection to the sphygmomanometer. Based on temperature and humidity data collected in the room, the temperature was 31°C, and humidity was 87%. Overall, the designed circuitry aligns with the requirements of the DPM module. Research findings demonstrate that the module can be effectively used for the calibration process of blood pressure devices
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