Calculate Flow Transmitter Output Current

A  flow transmitter  is  ranged  0  to  350  GPM,   4-20  mA  output,   direct-responding. Calculate  the current signal value at a flow rate  of 204 GPM.

Flow Transmitter Calculations

We are solving this problem using standard 4-20mA conversion Formula. Click here for formula

One  way  we could  solve for the amount  of signal  current  is to convert  the flow value  of 204 .

GPM  into a ratio of the flowmeter’s full-flow value,  then apply  the same  formula  we used  in the previous example relating percentage to milliamps.  Converting the flow rate into a “per unit” ratio is a matter of simple division, since the flow measurement range is zero-based:

Flow Transmitter 4-20 mA formula

Therefore,  the transmitter should output a PV signal of 13.3 mA at a flow rate of 204 GPM.

Flow Transmitter Calculations

An alternative approach is to set  up  a linear  equation specifically for this flowmeter  given its measurement range (0 to 350 GPM)  and output signal range (4 to 20 mA). We will begin this process by sketching  a simple graph  relating flow rate to current:

flow transmitter formula

Therefore,  the transmitter should output a PV signal of 13.3 mA at a flow rate of 204 GPM.

We can also solve the problem using direct formula. Click here for formula

Articles You May Like :

Flow Control Loop Controller

Variable Area Flow Meters

Linear to Square Root Extraction

PV to Percentage Conversion

Closed Tank Level Calculations

Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address

2 thoughts on “Calculate Flow Transmitter Output Current”

  1. Also Another Simple way to calculate:
    Signal = 4 – 20 mA..
    So Signal varies between 16 mA
    So Each gallon tends to have (16/350)= 0.046 mA
    So 204 Gallon will make (0.0457 * 204) = 9.33 mA
    Hence Output signal will be 4 mA + 9.33 mA = 13.33 mA

  2. how calibrate a ff type flow transmitter ABB 2600T range is 53.39mbar and out showing 5000m3/H how calculate plz gv reply on transmitter showing 53.39 m baar and on data sheet showing calibration range 5000 m3/hm confuse


Leave a Comment