Emerson 54e pH/ORP instruction manual PH Sensor Wiring, PH Sensor Compatibility

MODEL 54e pH/ORP	SECTION 3.0
	WIRING

pH SENSOR COMPATIBILITY

The following sensors contain solution grounds:

Models 381+, 385+, 396P, 396R

The use of these sensors will allow both glass and ref- erence diagnostics.

Figure 3-3 shows how these sensors should be wired. Note that wiring connections depend on whether the sensor (or junction box) has a preamp or not. If the sensor (or j-box) has a preamp, then the preamp loca- tion jumper is moved accordingly and wiring connected as on the left of Figure 3-3. Otherwise, the jumper is moved to the "analyzer" position and wiring for TB1 is connected as on the right hand side.

Junction box (P/N 23550-00) wiring for sensors that contain a preamp is strictly point to point. All sensor leads are run to the junction box and carried through by the extension cable (P/N 9200273). Only use this rec- ommended extension cable and be careful to connect all cable leads in the junction box. Sensors without pre- amps that require cable extension should be wired up to the junction box (P/N 23555-00) as per the appropri- ate sensor instruction manual.

The following sensors do not contain solution grounds but are compatible with the Model 54e pH/ORP:

Models 389-02-54, 396-54, 397-54, 399-09

Sensors without solution grounds must be wired differ- ently (see Figure 3-6). Diagnostics will only be possible on the glass electrode side of the sensor.

When extending cable, the junction box with preamp (P/N 23555-00) must be used. See Figure 3-7 for wiring details.

3.5 pH SENSOR WIRING

Be sure that the pH sensor has been properly installed and mounted. Wire the sensor to the junction box (if so equipped) and/or Model 54e pH/ORP according to Figures 3-5 through 3-7, or use the wiring diagram drawing included inside the controller. Use a narrow- bladed screwdriver to facilitate sensor wiring (see Figure 3-2).

The wiring diagrams show connections between the Model 54e pH/ORP and the junction box used where distance from the sensor to the controller exceeds the integral sensor cable length and inter- connecting wire is required. The interconnecting sensor wire recommended is P/N 9200273. Use of this cable provides EMI/RFI protection and com- plete sensor diagnostics (for sensors so equipped). The maximum interconnecting wire length is 500 ft.

IMPORTANT

All interconnecting sensor cable ends must be properly dressed, as shown in Figure 3-4, to pre- vent the individual sensor and shield wires from shorting. All shields must be kept electrically sep- arate all the way back to the terminals on the Model 54e pH/ORP. Check that there is no continuity between the shield wires and any other sensor conductors or shields prior to connecting the sen- sor wiring to the terminals on the Model 54e pH/ORP. FAILING TO FOLLOW THESE INSTRUC-

TIONS WILL RESULT IN CONTROLLER MALFUNC- TION.

FIGURE 3-2. Sensor Wiring Photo

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