The readings of the dual-display mechanical meter and the liquid crystal meter of the gas turbine flowmeter are inconsistent.

1. In the last picture, it seems that the straight pipe section in front of the flow meter is not enough.； 2. The pressure values ​​measured by the on-site pressure gauge and the flow meter are quite different. It is recommended to verify the pressure. 3. If there is no accumulated flow rate, it is possible that the value is already relatively large. It is recommended to clear the accumulated amount to zero when no material is fed.

Thanks for the advice. The straight pipe section is still long enough, but the shooting angle is not good. At present, I know that this watch has not been calibrated for more than three years or almost four years. Some people say that German watches have not been calibrated for eight years, but now it seems that the deviation is indeed very large. Does a dead battery affect the accumulation? In this case, can the reading of the mechanical watch be used as the criterion?

Is this the gas meter inside the gas pressure regulating cabinet? Your gas turbine flowmeter "has not been calibrated for more than three to four years" is of course inaccurate. As for "the German meter has not been calibrated for 8 years", it is because the gas quality is good (better than our ordinary compressed air) and the gas turbine flowmeter is of good quality (European standards require higher standards than national standards, and domestic manufacturers use their products to pass European standard certification as a selling point). The calibration period set by others is 8 years, or even 12 years. It can be seen from the picture given by the poster that your gas turbine flowmeter is composed of a mechanical part of the flowmeter body (usually called a base meter) and an calculator (with temperature and pressure compensation function). The base meter part can complete mechanical counting. The calculator part collects the rotation frequency of the impeller in the flowmeter and calculates it together with the instrument coefficient set in the calculator to obtain instantaneous working condition flow data. Then it performs temperature and pressure compensation calculations to obtain instantaneous standard condition flow data, and then performs cumulative calculations. Among them, the set instrument coefficient needs to be verified by the verification unit to be accurate (almost every verification will be modified). Your gas turbine flowmeter "has not been calibrated for more than three years or almost four years." Impurities, dust, etc. in the gas have long-term effects. There will be attachments in the flow channel of the flowmeter, and the bearings and impellers will have a certain degree of wear (as you can see from the picture, this is a non-oil-filled, also called dry gas turbine flowmeter. Compared with the oil-injected gas turbine flowmeter, the wear is more serious. In the gas industry, dry gas turbine flowmeters are not used now, and oil-injected gas turbine flowmeters are used.) Therefore, the instrument coefficient needs to be modified during calibration to ensure accurate measurement (my country stipulates that the calibration period is 2 years) ； Of course, it does not mean that modifying the instrument coefficient will ensure accurate measurement. There are other indicators, such as linearity, small flow test capability, etc.). From this, we can understand why the data on the mechanical counting and the calculator are inconsistent. As the use time of the calculator is delayed, the performance of its electronic components will change to a certain extent, which will also lead to inconsistencies. ； In addition, a certain degree of wear of the bearing will reduce the rotation speed of the impeller, causing the measurement data to be lower. This is not the original poster who "suspects that the data measured by this meter is much higher than the actual value." As for the calculator, sometimes there is no accumulation data, it may be that the battery is dead or the calculator itself is faulty. If the battery is dead, the calculator will not work, so make sure the battery is fully charged at all times. If the battery is indeed dead, you can only "according to the degree of the mechanical meter". At this time, it is best to refer to the pressure gauge and thermometer data for manual temperature and pressure compensation calculations, and you will get relatively accurate data (provided that the temperature and pressure are stable and agreed upon by both parties).

It is best to calibrate it after three or four years. Regardless of whether it is domestic or imported, regular calibration is still necessary for measuring instruments. Judging from your picture, the pressure sensor of this watch is no longer accurate. You can try changing the battery. It may not be the cause of the outage, just like the problem with the internal components mentioned on the fourth floor. Mechanical watches can be used as a reference, but the estimation error is also large.

As mentioned above, calibrate it. If it still doesn't work, you can use a portable ultrasonic flow meter to roughly compare the flow rate. If it doesn't work, you will modify the parameters. If conditions permit, restore the factory settings and reset the parameters.

"The watch in Germany has not been calibrated for 8 years"? Bullshit! Stinky bullshit. Germany, a broken country that was defeated twice in the war, a stinking Nazi country, is the best at pretending to be fake and cheating people out of money. Only idiots believe in Germany

There are many virtues and blows, but there are many who can sell them.