Minor issues encountered with the EJA530E pressure transducer
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As shown in the figure, the pressure is 0 kPa; why has the measurement range been changed to -1 to 4 kPa? The current output remains at 4 mA. The factory-set range of the gauge is 0 to 20 kPa – must the modified range be within 0 to 20 kPa?
The range should be automatically selected based on the actual operating conditions
530E is a gauge pressure transmitter. It would be strange if you could set a negative pressure! !
Can’t the lower limit of the gauge’s range be set to a negative value? (When trying to change it to a negative value on-site, it indeed indicates that the lower limit is too low.)
Gauge pressure transmitter: it must not be set to a negative value at all! ! ! ! This is the most basic. Besides, you also mentioned during the setup that the lower limit was too low.
:lol:lol:lol
The meter displays a message stating that the lower limit is set too low – this is due to the narrow-mindedness of the person who designed the meter; they tried to control too many aspects, and as a result the meter doesn’t work properly, only causing trouble for its users. Why? On the one hand, for pressure gauges in the 0–20 kPa range, with a lower limit down to -3 kPa, there’s absolutely no risk at all; even if someone tried to use them inappropriately, they wouldn’t have the capability to do so. On the other hand, it should be up to the instrument user to decide how to use the output signal of the device; the manufacturer of the instrument should provide sufficient convenience for its use. For example, if a user has a special requirement and wants the instrument’s output signal to remain above 12 mA at all times, then there’s no reason why that user shouldn’t be allowed to set the operating range of the transmitter, which normally spans from 0 to 20 kPa, to -20 to 20 kPa or -25 to 20 kPa. Such settings by the user don’t violate any common sense principles It is rather to ensure that the output signal remains above 12mA when using a pressure transducer in the range of 0–20 kPa! That’s all. Let me see. I’m not afraid that the instrument software might not be well-designed; what I’m most afraid of are those who are inexperienced and short-sighted in their design work, who create unnecessary constraints and add extra elements that aren’t needed. {:2_36:} .
Listen to me; that’s right: for the EJA530, if the diaphragm type is A, the range setting is 10Kpa–200KPa. Your current range is -1 to 4Kpa, which is only 5Kpa wide and does not meet the minimum requirement of 10Kpa. You should change the range to -1 to 9Kpa instead. Also, your previous range was 0–20 KPa; you changed it to -1~4, but in reality it hasn’t changed and remains 0–20, so the output is 4 mA.
There are two questions: can gauge pressure be used to measure negative pressure? And is 0-20 kPa the measurement range or the scale?
What kind of controller is this? In Chinese?
Isn’t it true that a gauge that measures absolute pressure cannot have a negative value? If a gauge that measures gauge pressure cannot take negative values, how can vacuum level be measured then?