Development of Multi-Point Thermostatic Standard Device for Portable Acidity Meter Calibration

In the verification of the acidity meter, it is required to verify the indication error of standard solution measurement and that caused by temperature compensation in a constant temperature environment. To avoid the low verification efficiency caused by the repeated heating and cooling of the traditional thermostatic cell, and to realize the rapid on-site verification, this project has developed a multi-point thermostat standard device based on the principle of independent thermostat control of small volume and multi-unit, using semiconductor chilling technology and PTC heating technology with PID digital adjustment technology, which is light in weight and can provide multiple thermostat standards simultaneously. The temperature uniformity of the device is less than ±0.1 ℃ and the temperature fluctuation is not more than 0.2 ℃, which can meet the needs of acidity meter field test or calibration.