Comparison: Yokogawa EJA530E vs LEEG DMP305X-TST-H
Today we have a pair of low-cost pressure transmitter to review. Let’s find out the pros and cons of the EJA530E from Yokogawa and the DMP305X-TST-H from LEEG Instruments! Both devices have tons of possibilities in the industry focus of each company.
Disclaimer: This product review examines only features, not performance. If you’ve used this device, feel free to share your experience in the comments.
These pressure transmitter come from Asian companies, in a weird coincidence. I realized that while doing the LEEG review. I explained in the EJA530E review why I chose that device, but when I searched for a similar product to compare, I found LEEG.
In general, both devices have a similar design, but we have a few small differences. For instance, Yokogawa’s device has a rounder shape, but LEEG’s looks nicer. With them side by side, the Yokogawa looks more robust than the LEEG, but each comes in many housing materials, so don’t base your opinion on looks.
You can get local displays on both devices as well as local setup, but we’ll get to that in a bit.
The EJA530E pressure transmitter has an optional screen that displays up to three process variables. It also depicts your range as a bar graph, which can make it easier to understand the percent of the device’s range.
And yes, you can set it up in the field. However, the process is a little unusual. The local parameter setting (LPS) requires you to open the housing to access the push button, then open the external adjustment screw cover using a flat-head screwdriver.
You can select nine options using the push button, and you use the screwdriver to turn the screw for more selections. Yeah, not really user-friendly. Why not add two more push buttons and make it easier and faster?
Now, the crew from LEEG kept the interface simple! The DMP305X-TST-H has a simple display with no graphics, as far as I could tell. I couldn’t find much about it in the technical docs. On the upside, the device has three push buttons on the screen and also below the identification plate on top of the device. You hardly need the documentation to navigate the menu, and you certainly don’t need a screwdriver! This round to LEEG!
I keep talking about flexibility with these things, but they really do offer various options for range and still provide reasonable accuracy, rangeability, and repeatability.
Yokogawa – by the way, Yokogawa’s Twitter rep is very nice – created an easy way to understand the options. You have four types of sensor capsules, and each has a different measuring range. Capsule A goes from 14.5 to 29 pounds per square inch, B to 290, C to 1450, and D to 7200. Beyond that, options A, B, and C offer a rangeability of 20 to 1, and D has 10 to 1. It provides a range of process connections too, such as PMC, Tri-clamp, and others.
LEEG offers six range options from -6 kilopascals (kPa) up to 25 megapascals (MPa). For example, you can select a range from -100 kPa to 1 MPa, with an overload limit of 25 MPa, or -0.1 MPa to 10 MPa, with a limit of 25 MPa. It comes with plenty of process connections as well, but we have enough alphabet soup already. You can check those out on the website or the manual.
These basic pressure transmitter have enough accuracy for most standard processes. The EJA530E has an accuracy of +-.055 percent and a stability of +0.1 percent per 10 years!
The DMP305X-TST-H has a standard accuracy of +-.075 percent upper range limit (URL) or an optional accuracy of +-.055 percent. On the downside, it only has +-0.2 percent URL per year for stability. While not critical, this point does put the EJA530E at an advantage.
Although you can deploy these devices in various applications, the protocols might limit you a bit.
Yokogawa’s developers bring all the know-how from their control systems to their instruments, so you can get analog+Brain, low-power device+HART, PROFIBUS PA, and a few others.
The DMP305X-TST-H only offers analog and HART. Furthermore, it doesn’t offer a low-power option. The analog needs from 10.5 to 55 volts, and the HART version needs 16.5 to 55.
Information and documentation
Yokogawa has a good site, with a responsive version for tablet and phones. You can find information much more easily than on competitor sites – Siemens, Endress+Hauser, looking at y’all! You can locate both the documents and the info you want from them quickly.
Considering the industry standard, I had low expectations for LEEG’s site, but it surprised me in a good way. Although simple, it makes it easy to find devices. It also responds well to phone and tablet, a tiny miracle in the automation world.
Not much to say here, but the EJA530E has an active sensor using DPharp technology, meaning you have constant communication between the sensor and the transmitter. If a problem cuts off the sensor, the pressure transmitter will know instantly! It also has Safety Integrity Levels (SIL) 2 and 3.
If you need digital protocols or have to have that fancy sensor tech, go with the Yokogawa device. Otherwise, you can scale out both devices to see how they’d perform using your process requirements. You might be surprised.
Table of Comparison