4-20mA Scale for IFTTT is not Precise

[job-systems]

Hi everyone, I am new to Kincony products, and have liked them very much until now. 

I have 12x KC868-A4 boards and 24x Dwyer DM-200 Differential Pressure Transmitters connected to the A4 boards on the A1 and A2 inputs that are 4-20mA. (Please refer to enclosed file: Dwyer DM-200).

The DM-200 Transmitter has a range (measured and confirmed) of 4mA = 0 Pascal (Pa) and 20mA = 62.21 Pa (Please refer to enclosed file: Instrument Scale), therefore, I assumed that Custom Value 1 is 0 Pa and Custom Value 2 is 62.21 Pa (Please refer to enclosed file: 4-20mA Scale).

When we go to "Monitor" icon to see what values Kincony is reading live at around 37 Pa on Dwyer, Kincony is showing 35 Pa, and at 0 Pa on Dwyer, Kincony is showing around 8 Pa. The 4-20mA signal is clearly arriving to Kincony, we checked the values of the signal and we get 4mA and around 12 to 14 mA when values of 30 and up Pascal. 

Thinking we where doing something wrong, we put: Custom Value 1 to "-15.56" Pa and Custom Value 2 to 62.21 Pa, like Instrument Scale picture, and values were also not coincident. 

We think there is a problem with scaling inside the KCS_KC868_A4_V2.1.9 firmware. 

Can you check? And let me know?

Thank you.

[admin]

first item is when 0mA's value.
second item is when 20mA's value.
   

[job-systems]

first item is when 0mA's value.
second item is when 20mA's value.

Hi @admin,

I tested what you say with signal generator and values are not coincident. 

Here the step by step of what I tested (I will put the picture number and an explanation at the side): 
01 = Configure ADC1
02 = Inside ADC1 I write unit in mA and put the same 0 to 20mA value of the analogue entrance. Press the button "SETTING" to save the configuration. 
03 = You can see on "Monitor" the values have been confirmed correctly. 
04 = I send 4.00 mA and I read 3.00 mA on webpage. 
05 = I send 12.00 mA and I read 10.45 mA on webpage. 
06 = I send 20.00 mA and I read 18.74 mA on webpage. 
07 = Configure ADC3.  Inside ADC3 I write unit in V and put the same 0 to 5V value of the analogue entrance.
08 = You can see on "Monitor" the values have been confirmed correctly. 
09 = I send 5.00 V and I read 5.00 V on webpage. Perfect. 
10 = I send 3.15 V and I read 3.13 V on webpage. Perfect. The difference is totally normal. 

Can you let me know if the test I did is correct?

Can you help me solve this problem so scale is coincident with what we read?

Thank you.

[admin]

1. set all range option in KCS webpage to 0. Then it will showed raw data. from 0 to 4095.
2. adjust current slowly larger, when webpage showed 4095, then you input the current value to KCS webpage's MAX range value.