| Overview | 
| Specifications | Download
Manual |
| Q. | How do I span the 4-20 mA signal? |
| A. | The 20 mA set point is entered as a frequency, using four rotary switches. A simple calculation determines the frequency. The unit is microcontroller-based, and it digitally adjusts itself when the 20 mA frequency is entered. |
| Q. | How do I power the flow sensor? |
| A. | The flow sensor gets its power from the AO55, which gets its power from the 4-20 mA signal itself. Both the flow sensor and the AO55 transmitter can operate on the 4 mA minimum current. |
| Q. | What does "loop powered" mean? What does "two-wire 4-20 mA mean?" |
| A. | They basically mean the same thing. See the answer above. |