红外测温 发射率:谁能帮我翻译一下?专业英语.工程方面的

About the pump 131WP01FU :
The purpose is to control the fluid of the pump!
Therefore we first need to know the flow the pump is actually pumping, we need the flowtransmitter for this. The flowtransmitter SEND (send out) a signal ranging from 4-20mA. This current is proportional to the actual flow. This current signal is send into the PLC. The PLC RECEIVES this signal from the transmitter. To do this we connect the current signal on an analague input. Now, the PLC knows the actual lfow af the pump.
Second, we want now to control the pump, so the flow is at the exact flow we want it. (this we call the "Setpoint" for the flowcontrol in the PLC). Therefore the PLC calculates the actual flow (received as described in point 1) and compares it with the setpoint. If there is a difference, the PLC will control the speed of the pump to give more or less flow (= speed).
To do so the pump is equipped with the frequency converter. The PLC controls the speed of the pomp by SENDING an analogue signal to the frequency converter also an 4 to 20mA cuurent signal.
This signal is calculated as I said in function of the actual flowrate measured by the flowtransmitter and the setpoint (programmed in the plc). So the frequency converter RECEIVES FROM THE PLC an analague signal by an analogue output.

In principle, if we are speaking of inputs and outputs, we always understand this from the PLC side.
-INPUT means that the PLC RECEIVES a signal (analogue or digital) from outside (transmitters switches)
-OUTPUT means the PLC SENDS a signal (to a relay, a signallamp, an analogue signal to a frequency converter)

Resume:
The flowtransmitter must send an analague (input) signal to the PLC (so PLC receives information of the flow)
The PLC calculates together with the setpoint the output to give to the frequnecy converter to control the pump.
The PLC SENDS an analogue (output) signal to the frequency converter (so PLC controls speed of pump and the flow)