UFM UFM-40, Installation & Operating Instructions Manual

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Page 30 of 51
Current Loop Mode Select
CL mode Select [55
0. 4-20mA
0. 4-20mA set up the 4-20mA output to. be flow rate mode
1. 0-20mA set up output range to be 0-20mA mode
2. 4-20mA vs.Vel. set up the 4-20mA output to. be velocity mode
3. 4-20mA vs.Energy set up current loop output 4-20mAcorresponding energy
Other different current output characteristics are displayed in below figures. The user can select one of them
according to his actual requirements.
In two graphs shown above, flow F
4mA
indicates the value that the user entered in Window M57; and flow F
20mA
indicates the value that the user entered in Window M58. In the 4-20mA modes, F
4mA
and F
20mA
can be selected as
a positive or negative flow value as long as the two values are not the same.
CL 4mA Output Value
CL 4 mA Output Value
0.0000 m3/h
Set the CL output value according to the flow value
at 4mA. The flow unit’s options are the same as those
in Window m31. Once "4-20mA vs.Vel." is selected
in Window M56, the unit should be set as m/s.
20mA Output Value
Set the CL output value according to the flow value at
20mA. the flow unit is the same as that found in
Window m31. Once "4-20mA vs.Vel." is selected in
Window M57, the unit should be set as m/s.
CL 20mA Output Value
14400.00 m3/h
CL Check Verification
Check if the current loop has been calibrated before
UFM-40 Ultrasonic transit-time flowmeter