1. When calibrating the EJA table, why does the upper limit value change as well when the lower limit value is changed?
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1. When calibrating the EJA gauge, why does changing the lower limit cause the upper limit to change as well, resulting in an unchanged range? And why, when changing the upper limit, does the lower limit not change, thereby altering the range? Why?
Are you using a BT200 to adjust it? The range of this transmitter is fixed at the time of manufacturing; what you can change is its PV value. Therefore, when making adjustments, the range remains unchanged while only the PV value changes. So please make it clear whether you are using a 375 or a 200. Some EJA transmitters support 375, while others do not
Please study carefully the methods for adjusting the zero point and range of the instrument. Then I’ll know. This is basic common sense.
All models in the eja series come with detailed instructions; haha, troubleshooting information related to this issue should be included in them. We didn’t encounter such a problem when we were making adjustments back then! It’s recommended to check the manual to see if there was a mistake in the operation
Since different diaphragm boxes are used across the various range levels of the EJA, the pressure it can handle exists within a certain range. Protection in this regard has also been implemented in the software. It can only be used for measuring parameters within the measurement range specified on the nameplate. (The nameplate indicates the range and the factory-set range. The factory calibration range is determined based on the parameters specified in the order. The measurement range is the maximum range that the diaphragm box can measure. When adjusting the zero point, it is as if the reference point moves within the coordinates; accordingly, the same amount of movement occurs in terms of the relative range, which inevitably results in the upper limit value changing as well when the lower limit value is altered. When the range is changed (within the measurement range of the diaphragm box), its zero point hardly changes. This is also one of the advantages of EJA transmitters.
Then, a related question: if it is within the range, is it possible for me to change the range?
This is just a convenient little setting provided by the BT200 manual controller; if you are performing a migration, simply change the lower limit, and the upper limit will change automatically, saving you one step. If changing the upper limit also causes the lower limit to change accordingly, then won’t it be impossible to adjust either the range size?