Is possible control the flow of the pump (regulate) with a datalogger CR800, CR1000 or CR6?
If the pump has a PWM input, you could use a PWM output from the datalogger. If the PWM input of the pump needs a stronger voltage, you could put a solid state relay between the PWM signal of the datalogger and the PWM input of the pump.
If the pump has a 4-20mA input, you could connect a SDM-CVO4 module between the datalogger and pump controller.
Thanks but a PWM output from the datalogger only change state off to on. So I want to change the flow for example 30 lpm, 40 lpm, 70 lpm. or keep in a fixed flow determinated.