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WHAT YOU NEED TO KNOW
BEFORE INSTALLING AND WIRING A ROSEMOUNT ANALYTICAL
SENSOR TO THE MODEL 3081 pH/ORP TRANSMITTER
1. THE MODEL NUMBER OF THE SENSOR
• Look on the label.
• Also note the model option string.
• If the label is missing or unreadable, see the
flowcharts on pages 28 through 30.
Write the sensor model number here
2. THE TYPE OF TEMPERATURE ELEMENT
• Look on the label.
• If the label is missing or unreadable, measure the
resistance between the RTD leads.
Write the temperature element RTD here
3. THE LOCATION OF THE PREAMPLIFIER: INSIDE OR OUTSIDE THE TRANSMITTER?
• If the sensor is wired through a junction box, the preamplifier is ALWAYS in the junction box or
the sensor.
If resistance is . . . the RTD is . . .
about 110 ohms Pt 100
about 3000 ohms Balco 3K