Dwyer UFC User Manual download pdf (Page 32)

3: Operating Procedures

8. Connect a calibrated ammeter to the 4 to 20 mA

output and adjust the UP/DOWN Scroll keys

(Coarse) and LEFT/RIGHT Scroll keys 5 & 6

(fine) until the output is exactly 4.00 mA.

The DAC should indicate approximately 8000.

9. Press ENTER when done.

10. With the meter still connected to the 4 to 20 mA

output adjust the Scroll keys to obtain an output

of exactly 20.00 mA.

The DAC should indicate approximately 40000.

11. Press ENTER when done.

4-20mA Signal scaling

Note: The 4 to 20 mA can be set to represent a particular flow range. It is also possible to enter a negative figure

for the minimum output and this would enable a reverse flow to be monitored.

12. With the instrument operating in the FLOW

READING mode, press the 4-20mA function

key. This will access the 4-20mA OUTPUT

screen.

13. Select Flow at max. output and press

ENTER, then enter a value of the flow rate

that you want to associate with a 20.00 mA

output.

14. Select Flow at min. output and press

ENTER then enter a value of the flow rate that

you want to associate with a 4.00 mA output.

This could be ‘0’.

15. Select Output mA for error and enter a value (max of about 26 mA) that you want the 4 to 20 mA output

to produce in the event of an error (e.g. if the flow-rate is outside the set range).

16. Upon completion press ENTER to return to the FLOW READING screen.

CALIBRATE 4mA DD-MM-YY HH:MM:SS

Adjust the output current to 4mA

Use

UV to set, 5/6 to trim

DAC Value: 8000

Press  when done

CALIBRATE 20mA DD-MM-YY HH:MM:SS

Adjust the output current to 20mA

Use

UV to set, 5/6 to trim

DAC Value: 40000

Press  when done

4-20 mA OUTPUT DD-MM-YY HH:MM:SS

4-20 mA O/P is ON

mA Output Reading : 0.00

Output Range : 4-20

Units : gal/min

Flow at max. output : 0.00

Flow at min. output : 0.00

Output mA for error : 22.00

Exit

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Dwyer UFC User Manual Page 32

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