test involving temperature measurement

(1) temperature
test involving temperature measurement range from room temperature to liquid nitrogen temperature led rental screens, the use of thermocouple thermometer, the temperature signal measured by the DMM, collect and input monitoring and control computer, the computer displayed on the screen by the computer automatically recorded and renault megane car gps dvd. At the same time, the computer will be transported to the temperature measured on the instrument panel temperature display device for on-site display.
2) pressure
test pressure measurement Cooling tower of 0 ~ 10M Pa. Analog gauges and the use of precision digital pressure gauge on the instrument panel display system pressure field, while the pressure measurement system using pressure transmitter, and converted to voltage led waterproof Switching Power Supply by the digital multimeter measurement, monitoring and control computer to collect and enter , displayed on the computer screen by the computer automatically recorded and saved.
(3) level
liquid nitrogen in order to ensure a high degree of valve testing to meet the requirements, the use of differential pressure transmitters measure the liquid level. Measuring electrical signals measured by digital multimeter, collected and entered into the computer display, and to remind stop filling liquid nitrogen and liquid nitrogen filling operation.
(4) flow
different forms according to the valve seal, valve allows leakage is different. Soft seal structure of the valve, the leakage rate should be zero. As for the seal of the valve itself is allowed to have a certain amount of leakage. Based on the above, the device is equipped with two measuring flow, one flow meter is a small, used to measure allows a certain amount of leakage seal valve or valves in the relatively soft seal under normal operating conditions when the leakage .
for the small amount of leakage, due to the general flow meter has been unable to detect, observe and be counted  best backpacks the open end of the number of bubbles in the water leakage in the form of measurement. The use of computer data acquisition system records the number of electrical pulses, automatic counting.