Issues regarding the zero offset of gauge pressure transmitters
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The absolute pressure transmitter in the device has a range of 0~200 Kpa; it currently shows 95 Kpa when connected to the atmosphere. Using the manual controller, it is not possible to lower the zero point – the lowest value that can be reached is zero. Moreover, there are no conditions at the site that would allow vacuuming to be used to force a zero adjustment for this transmitter. Is there any other way? Is this the same for absolute pressure transmitters from other brands? The one used on site is the Yokogawa EJA510A.
Not allowing migration? Well... that’s definitely stupid. Those idiots refuse to let you do it~~~~ Send your Mastiff with a black back over there, have it bite him, rape him. . But my brother was also very puzzled: since you don’t know the zero point of that stupid gauge or by how much it’s off, how can you proceed with the migration then?
There’s no other choice; contact the manufacturer and ask them to replace it
Calculations are performed at the current atmospheric pressure of 100 Kpa
What you’re doing is completely wrong. 1. Is the current atmospheric pressure really 100 kPa? How did you find out about it? 2. Even if the current atmospheric pressure happens to be 100 kPa, but the gauge shows 95 kPa, adjusting it by 5 kPa would still be incorrect. Because the deviation at a certain point includes both zero-offset components and full-offset components, as well as linear deviations. If you treat a value that is not at zero offset as if it were a zero-offset, then when the pressure is not at 100 kPa – for example, at 30 kPa, 50 kPa, 150 kPa, etc. – the readings given by the instrument will be highly inaccurate. 3. To correct these deviations and obtain accurate results, rules must be followed; random manipulation will not work.
4. Place the absolute pressure gauge in an upright position as well as at a 90° tilted position, and observe the degree of deviation in the readings shown by the gauge in these two positions. 5. For gauge pressure gauges with excessive deviation, as well as those with large installation posture errors, it is difficult to determine the actual measurement accuracy unless zero adjustment is performed. 6. Instruments are usually calibrated in a vertical position in the factory. Install on-site, trying to maintain the same orientation as in the factory; this way, the installation orientation error should be smaller.