132250-series Operating Manual rev 2.03.5 Connecting ProbesAs shown in Figure 3-8, the cover of the cover of the AM-2250 swings open to reveal a connector blockfor connecting probes. A label inside the controller identifies the terminals so reference to this manual isunnecessary. Note than connectors 1 and 2 are used for the 4-20 mA output (CH1) of the AM-2250 andAM-2251 controllers. The AM-2250TX transmitter also uses them for power input.Figure 3-8 - This view of the inside of the front cover shows the connector for the probes and mounting holes for DIN rail brackets.Figure 3-9 and Figure 3-10 shows probe connections to the connector block. The colors of the cells referto the colors of the wires of the AquaMetrix probes. Color coding of AquaMetrix differential probesmatch that of Hach/GLI analog probes. Other manufacturer probes may use different colors.Figure 3-9 AM-2250 and AM-2250TX sensor wiringDIN Rail Bracketmounting holes(AM-2250TX only)Probes Connector