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活塞式压力计检定规程规定,测最上限6～300公斤力/厘米~2活塞式压力计(以下简称压力计)用的工作介质为变压器油,在20°(时,其运动粘度为9～12厘斯。但目前在市场上买来的10号、25号变压器油,粘度偏大,往往超过规定。工作介质粘度的大小,对压力计的灵敏度、活塞转动延续时间和活塞下降速度有很大影响。比如,检定一台压力计,当工作介质的粘度符合要求时,以上三项参数性能指标均合格。当工作介质的粘度小于规定值时,活塞下降速度就可能不合格;而当工作介质的粘度大于规定值时,活塞转动延续时间及灵敏度又可能不合格。由此可见,如果工作介质的粘度不符
Piston gauge test procedures, the maximum measuring limit 6 ~ 300 kg force / cm ~ 2 piston gauge (hereinafter referred to as pressure gauge) with the working medium for the transformer oil, at 20 ° (when the kinematic viscosity of 9 ~ 12 centistas, but now on the market bought No. 10, No. 25 transformer oil, the viscosity is too large, often exceed the provisions of the size of the working medium viscosity, the sensitivity of the pressure gauge, the piston rotation duration and the piston speed is very For example, testing a pressure gauge, when the viscosity of the working medium meets the requirements, the performance of the above three parameters are qualified.When the viscosity of the working medium is less than the specified value, the piston may not drop speed; and when working Medium viscosity is greater than the specified value, the piston rotation duration and sensitivity may not be qualified.Thus, if the working medium viscosity does not match