Pressure calibrator is a type ofpressure gaugeIt has the characteristics of small size, light weight, handheld structure, and easy portability, which are favored by a wide range of users and suitable for on-site application and manipulation. However, in the on-site application process, it is important to pay attention to the following points:

1. When testing, the measured pressure should be taken into accountinstrumentDisconnect the equipment pipeline completely, eliminate the dirt in the pressure chamber, and then connect it to the scale. Measuring -0 1 ～ 1. When equipped with a high-pressure gas source pressure of 6MPa, some pressure calibrators with built-in pressure modules and complete pressure equipment may be capable of performing the testing task. When measuring 1 When equipped with a gas source pressure of 6-10MPa, individual pressure calibrators require the use of external pressure modules for portable manual pressurepumpStop detection.

It is important to pay attention to the cleaning of the pressure gauge being tested. After the pressure instrument is assembled on site, if it is not cleaned or not thoroughly cleaned, it should be connected to the pressure calibrator for calibration. Dirt will accompany the pressure stabilization and enter the measurement system of the pressure calibrator, infecting the pressureforce sensorThe pressure generating mechanism may block or obstruct external pressure pipelines, wear or scratch sealing components, affect the measurement accuracy of the pressure calibrator or prevent it from performing abnormal tasks, or even directly damage it. In the case of convenient on-site cleaning, it is recommended to apply filters between the tested equipment and the pressure calibrator.

2. On site inspectionPressure transmitterorsensorEquipped with intelligenceDigital Display InstrumentWhen constructing a pressure measurement system, individual calibration software that responds to the process on the computer or display panel can stop modifying the indication and linear adjustment. However, in the actual measurement obligation, there may be some unknown reasons that cause the system pressure indication to deviate significantly or show no abnormality, and the software cannot adjust to the abnormal value through the process. There are two steps to dealing with such grades:

(1) Closed pressure measurement systempower supplyReduce pressuretransmitterorsensorofterminal blockSeparate from the system, use a pressure calibrator to independently supply power to the transmitter or sensor and measure its output signal to determine whether its task is abnormal;

(2) Based on the difference in the signal received by the digital display instrument, the signal that responds to the input of the digital display instrument on the circuit where the transmitter or sensor is disconnected. It should be noted that when the digital display meter outputs DC 24V and accepts the signal as a current signal, and the wiring method is a two-wire system, it is not possible to directly input the current signal from the signal source.

turnresistanceThe box and ammeter are connected to the circuit in series to adjustresistanceIf the current meter displays the scale current value of the input digital display, calculate the corresponding scale pressure value, and compare it with the digital display. If the difference is too large and does not meet the application skill requirements, the adjustment should be stopped. After adjusting the transmitter or sensor and the digital display, connect them together and conduct a group test to adjust them appropriately.

3. When verifying, attention should also be paid to whether the pressure equipment can be a prohibited oil equipment. It is necessary to stop the prohibited oil treatment of the pressure calibrator, its external module, and hand pump. An oil-water separator can also be connected to ensure the safety of the equipment application. If it is necessary to stop measuring in flammable and explosive environments, the pressure calibration of the safety instrument should be stopped based on explosion-proof requirements such as explosion-proof markings and terminal explosion-proof parameters, referring to the selected response pressure calibrator, cut-off barrier, and safety barrier.

The pressure calibrator is often used in on-site operation processes. If the following three points are not carefully considered during the process, it will affect the application of the pressure calibrator, resulting in deviations and problems, which will affect the measurement.