232250-series Operating Manual rev 2.0The AM-2251 controller contains a pressure sensor that measure atmospheric pressure somanual entry is not required.8. Salinity also affect the concentrations of oxygen in water. The amount of oxygen that can dissolvein water decreases as salinity increase. Seawater solubility is about 20% less compared to freshwater. Salinity is usually expressed in ppt (g/l) units. In most applications the salinity value shouldbe between zero (fresh water) and 40 ppt.9. Press Run to confirm that selected DO and temperature units are displaying correctly. Evenwithout temperature calibration the temperature reading should be within 1 °C of the correctvalue.4.5 Flow (AM-2250 and AM-2250TX)Any flow sensor that outputs a pulse will work with the AM-2250 and AM-2250TX. This includes paddlewheel meters and magnetic flow meters (aka “magmeters”). The 2250 measures both instantaneous flowand totalized flow. The latter is a running total of the volume and is equal to the flow integrated overtime.1. Scroll down the top-level menu to select Setup and press the Enter key.2. Press Probe Selection to choose the probe type, Flow.3. The following screen should appear4. Set Volume Units. Choices are gallons, ft3, cm3 and liters.5. Set Time units.