As a widely adopted flow measurement device in both civil and industrial fields, the temperature range index among the technical performance parameters of the cold water meter is of crucial significance. This indicator specifically covers three core dimensions: the applicable range of medium temperature, the working environment temperature range, and the temperature indication display range. Accurately understanding and strictly following the relevant temperature parameter specifications is an important technical prerequisite for ensuring the accuracy and reliability of measurement data. In the selection and application process of cold water meters, it is necessary to conduct a systematic assessment of various temperature parameters based on the actual working conditions to ensure that the performance indicators of the metering device fully meet the usage requirements and achieve precise metering functions.
1. Applicable range of medium temperature
The applicable medium Temperature Range (Water Temperature Range) of a cold water meter refers to the working medium temperature range within which the measuring instrument can maintain the specified measurement accuracy. According to the provisions of the National Metrological Verification Regulation (JJG 162-2019) and relevant industry standards (ISO 4064), the applicable range of medium temperature for conventional cold water meters is from 0℃ to 30℃. When the medium temperature exceeds this limited range, it may lead to an intensification of the thermal expansion and contraction effect of the measuring elements, thereby causing the measurement error to exceed the allowable range and affecting the legal validity of the measurement data.
2. Working environment temperature range
The Ambient Temperature Range refers to the limit value of the ambient temperature that a cold water meter can withstand while maintaining stable metering performance. According to the requirements of the GB/T 778.1-2018 “Drinking Cold Water Meters and Hot Water Meters” standard, the standard working environment temperature range of cold water meters should be controlled between 0℃ and 40℃. Wide-temperature type products should be selected for applications in special environments. It should be particularly noted that when the ambient temperature is below 0℃, there is a risk of damage to the instrument due to the freezing of the medium. When the ambient temperature exceeds 40℃, it may cause the performance of electronic components to deteriorate, resulting in a decrease in measurement accuracy.
3. Temperature indication display range
The Temperature Display Range refers to the range of temperature values that the digital display screen of a cold water meter can normally show. The current industry standards stipulate that the temperature display range of cold water meters is usually from 0℃ to 99℃. The design of this display range takes into account the display requirements under extreme working conditions. When the medium temperature exceeds the display upper Limit, the display screen will show an “OL” (Over Limit) over-limit prompt. At this time, technical measures should be taken in a timely manner to avoid affecting normal measurement management due to abnormal display.