AO55


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Loop-powered blind analog transmitter

	Two-wire 4-20 mA output Exact digital setting of the 20 mA flow rate Rugged cast aluminum housing with fused coating Electronic components potted solid in urethane for maximum moisture protection Can be meter or wall mounted Test switch to force 4 and 20 mA outputs Variable averaging to smooth output from particularly turbulent flows

Spectifications:

Power

12-36 VDC

Temperature

32° to 130°F (0° to 55°C)

Input

open-collector solid-state

Minimum Freqency

10 Hz (@20 mA)

Maximum Frequency

999.9 Hz

Output

proportional 4-20 mA

Frequency Settings

4 rotary DIP switches

Input Averaging

2 to 16 seconds (switch selectable)

Response Time

2 to 60 seconds
90% of full scale
(dependant on input averaging)

FAQ's

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.