How to calculate 4-20 mA process value? Next, we take this percentage value and translate it into a 4-20 mA current value using the formula: Current = (16mA) (P/100%) + (4mA) = (16mA) (20%/100%) + (4mA) = 7.2 mA Therefore, the transmitter should output a Process Value signal of 7.2mA at a temperature of 60 F. In pneumatic systems, a standard signal range of 3 to 15 PSI (Pounds Per Square Inch) is used. For more info checkout the above mentioned article. What's the difference between 4 Ma and 20 mA? Typically, a 4 mA current value represents 0% of scale, a 20 mA current value represents 100% of scale, and any current value in between 4 and 20 mA represents a commensurate percentage in between 0% and 100%. Lets say you have a device which provides 0-5V and you want to control a different device which needs 4-20mA signal in that case you can use arduino analog input to read the 0-5V and you can use this 4-20mA transmitter to convert that 0-5V into 4-20mA. All selections provide 16-bit (0.0015) resolution of output span and 0.02 output accuracy of a reading from -99,999 to +99,999 counts that is also transmitted digitally. Usually, this scale is linear, as such: Being a linear function, we may use the standard slope-intercept linear equation to relate signal percentage to current values: Where, y = Output from instrument. 4-20 mA, 0-10V or -10V to +10V analog transmitter output, isolated, jumper-selectable and user scalable. A precision on-chip metal film resistor network provides input scaling and current offsetting. It accepts inputs of 0 to 5V or 0 to 10V and can be connected for outputs of 4 to 20mA, 0 to 20mA, 5 to 25mA and many other commonly used ranges. A 4 to 20 mA current signal represents a 0 to 100 percent scale. The XTR110 is a precision voltage-to-current converter designed for analog signal transmission. Output Current in range of 4-20mA, X = 15.5 mA How to convert 4 to 20 mA signal? Standard 4 to 20 mA Conversion Formula. › 2008 Gmc Catalytic Converter Recently SearchedįAQ about 4 To 20ma Conversion Formula Convert How to calculate equivalent current from 4-20mA? The current corresponding to a measured value can be calculated with the 4-20mA scaling formula explained below: A Temperature transmitter with a range of 0 to 250 deg C and its output is 15.5 mA. › 2009 Prius Catalytic Converter California The accuracy of this circuit is better than 1% across the operating range, that can be done by compensating for the dominant error.All Time Past 24 Hours Past Week Past month Popular Searched However, the performance with unmatched components was better than 1% at full-scale. The worst-case output error is 5% based on Monte Carlo analysis. Using 1% resistors, this circuit will perform well.
Beside that, IC2 comparator can be used to flag a pre-set loop current or monitor input voltage. An output range of 0.05V to 5.045V is generated by IC2 that is configured as unity-gain difference amplifier. Using the resistor values shown (R2-R6), the output of IC at pin 8 is approximately 6.25V at 20mA and 1.25V at 4mA. To generate a ground-referenced output that ranges from 0V at 4mA to 5V at the full-scale loop current (20mA), a reference/op-amp/comparator device (IC2) is employed. In this circuit, a current-sense amplifier (IC1) is used to monitor the loop current. It is ideal conversion to digital with an analog-to-digital converter (ADC). This is a simple circuit that can be used to convert a 4-20mA signal to a 0V to 5V analog voltage.
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