Meaning of EJA503E specification code

The EJA503E is a differential pressure transmitter, and the meaning of the characters in its specification code is as follows: EJ denotes the Yokogawa brand; A indicates the product series (Series A); 50 refers to one of the models designed for high-precision measurements; 3 signifies the signal output method (3 means 4-20mA DC, two-wire output); E indicates the installation method (E means flange mounting); A denotes the signal interface (A means JIS 5K flange). Therefore, the EJA503E is a transmitter that is mounted on a flange for measuring differential pressure, and it can output a 4-20mA DC current signal. Regarding the meaning of the measurement range A being 10~200 KPA: A represents the range of 0~10 KPA, but in reality the measurement range can be adjusted by setting different ranges. For example, this transmitter can measure pressures in the range of 10 to 200 KPA, which means it is capable of detecting pressure differences ranging from 10 KPA to 200 KPA. .

It is the upper limit of the set range; once this value is set, it corresponds to 20mA on your instrument. The accuracy is also related to the range, and the specific error values are determined according to the conversions provided in the instructions.

Is that what it means? I use the handheld controller to adjust the measurement range – can the minimum value be set to 0-10 kPa? If I try to set it to 0-5 kPa, it’s not possible to do so, or is it possible to make such changes but only with an uncertain level of precision?

If my operating pressure is only 3 kPa, then choosing diaphragm A would not be suitable

That’s what it means; it seems that no further changes can be made. But in reality, the minimum value hasn’t been altered at all, so it’s hard to say for sure~

The operating conditions are acceptable as long as they are within the specified range; what’s important is whether its accuracy meets your requirements – if it does, then it’s fine.

My understanding is that the range refers to the value obtained by subtracting the lower limit from the upper limit; this value must not be less than 10 nor greater than 200. For example, with a manual controller, it’s not possible to set the range to -3-3, nor to 0-250 – such settings may not be valid (I haven’t tried it). It seems to be related to the 4-20mA output current; exceeding this range means that accuracy cannot be guaranteed, or the diaphragm may be subjected to excessive pressure. For 3 Kpa, this diaphragm is a good choice; or use the EJA510E for gauge pressure

Firstly, OCD causes a lot of discomfort; it should be EJA530. My understanding is that it’s actually possible to measure 3 kPa, but you need to set the range of this transmitter to 0–10 kPa. Since we usually use values in the range of 0-XX kPa, based on my experience, this XX should be within the range of 10-200; values outside this range – whether above 200 or below 10 – cannot be written.