How do the SMF320 and SMF420 differ?
For those interested in Magnetic-inductive flow meters or magnetic inductive flow measurement devices, specifically in the SMF series, who are deciding between using the SMF320 and SMF420 because both models look almost identical, distinguishing them requires looking at their specifications to determine which one is best suited for your needs. Therefore, SCMA, the distributor of these two product lines from ifm, will clarify the differences in this article titled "How do the SMF320 and SMF420 differ?" Let's take a look.
Product Characteristics, Application
Let's start by looking at how the SMF320 and SMF420 differ in terms of their characteristics. The differences between these two models lie in the Measuring range and Nominal diameter, which are as follows:
The measuring range (measurement range) for the SMF350 is as follows:
- 5...750 l/min
- 300...45000 l/h
- 0.07...10 m/s
- 0.3...45 m³/h
For the SMF420, the measurement range is larger and includes:
- 10...1200 l/min
- 600...72000 l/h
- 0.09...10 m/s
- 0.6...72 m³/h
As for the Nominal diameter (DN), or the nominal pipe size, the SMF320 has a DN40 (1 1/2") size while the SMF420 is DN50 (2").
Measuring/Setting Range
Next, let's look at the product characteristics settings. It must be said that there are quite a few differences between them, as mentioned in the measurement ranges discussed earlier and those to be mentioned now. So what exactly are they? Let’s take a closer look.
Display range (display period)
The SMF320 has the following display periods:
- -900...900 l/min
- -54000...54000 l/h
- -12...12 m/s
- -54...54 m³/h
As for the display period of the SMF420, it has these values:
- -1440...1440 l/min
- -86400...86400 l/h
- -12...12 m/s
- -86.4...86.4 m³/h
Regarding the factory setting note, the SMF320 has a value of 0...11,0 m³/h, while the SMF420 has a value of 0...18,0 m³/h.
The Analogue start point (ASP) values for both models are quite different. The specific values for each model can be seen as follows:
SMF320
- 0...600 l/min
- 0...36000 l/h
- 0...7.95 m/s
- 0...36 m³/h
SMF420
- 0...960 l/min
- 0...57600 l/h
- 0...8.19 m/s
- 0...57.6 m³/h
As for the Analogue end point (AEP) values, they are as follows:
SMF320
- 150...750 l/min
- 9000...45000 l/h
- 2...9.95 m/s
- 9...45 m³/h
SMF420
- 240...1200 l/min
- 14400...72000 l/h
- 2...10.19 m/s
- 14.4...72 m³/h
Next, the Low flow cut-off (LFC) values for both models are quite different, with each unit having the following ranges:
SMF320
- 0...600 l/min
- 0...36000 l/h
- 0...7.95 m/s
- 0...36 m³/h
SMF420
- 0...960 l/min
- 0...57600 l/h
- 0...8.19 m/s
- 0...57.6 m³/h
Interfaces
When it comes to connectivity, there is virtually nothing different as both support IO-Link with the same settings such as Transmission type, IO-Link revision, Profiles, and IO-Link process data (cyclical). However, what sets them apart is Supported DeviceIDs. The SMF320 has a default value of 1789 while the SMF420 has a default value of 1639.
Operating conditions
Regarding operating conditions, whether it's temperature or protection requirements, both models are similar. However, in terms of the temperature range they can be stored in, SMF320 should be kept at temperatures around -25...80°C while for SMF420, it is recommended to store them at temperatures between -20...80°C.
Displays / operating elements
At first glance, the display of SMF320 and SMF420 seem identical in terms of clarity and LED lights around the screen. However, ultimately each model will have its differences. Here's how their displays differ:
Display SMF320
- full graphics TFT display, multi-colour 3.5" 320 x 240 Pixel
- display layouts: 4
- display rotation: 4 x 90°
- operating status LED ring, three-colour
- totaliser Display range -999990...999990 m³
- totaliser Resolution 0.00001 m³
Display SMF420
- full graphics TFT display, multi-colour 3.5" 320 x 240 Pixel
- display layouts: 4
- display rotation: 4 x 90°
- operating status LED ring, three-colour
Display unit
- SMF320 l/min; l/h; hl/min; hl/h; m³/min; m³/h; m/s; μS/cm; S/m; ms/cm
- SMF420 l/min; l/h; hl/min; hl/h; m³/min; m³/h; m/s; °C; μS/cm; S/m; ms/cm
And for another difference, it must be about weight. The SMF320 weighs 5,316.8 grams while the SMF420 weighs 5,798.2 grams. It can be said that there is not much of a difference, even if you hold them in each hand, you would hardly feel which one is heavier. As for the price, the SMF320 costs approximately 134,000 THB and the SMF420 costs around 138,000 THB, which means there isn't much of a difference.
Those who have read this far should now be able to answer what are the differences between the SMF320 and SMF420. The decision on which one to buy can now better suit your own work needs. If anyone is interested in both models, you can contact SCMA for inquiries. We are happy and ready to serve everyone with enthusiasm.
