The SeaMetrics AO55 is a blind (non-indicating)4-20 mA transmitter, designed for use with almost all SeaMetrics flow sensors. It accepts a pulse frequency input from the flow sensor, and converts this input into a continuous analog output signal. Power for the transmitter is taken from the current loop itself, so only two wires are required. The digital design makes it possible to span the unit in the field without tools.  The frequency at which 20 mA is desired is entered on a set of rotary switches, and an internal  micro controller automatically scales all other values accordingly. An additional benefit of the micro controller is its ability to average inputs, for smoothing of the output signal. The degree of averaging can be selected in the field, from 2 to 16 seconds.

PRODUCT FEATURES AND SPECIFICATIONS

• Loop-powered blind analog transmitter

• Two-wire 4-20 mA output

• Exact digital setting of the 20 mA flow rate

• Test switch to force 4 and 20 mA outputs

• Variable averaging to smooth output from particularly turbulent flows
   

• Power: 12-36 VDC

• Temperature: 30 to 130 degrees F (0-55 Degrees C)

• Input: Open-Collector Solid-State

• Minimum Frequency: 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)

PURCHASE ANALOG TRANSMITTERS