The Rosemount 5081-P two‑wire pH/ORP transmitter manual provides installation, wiring, calibration, programming and maintenance instructions.
This manual covers the Rosemount 5081-P two‑wire pH/ORP transmitter, a rugged Type 4X (IP65) device for measuring pH or oxidation‑reduction potential in process liquids. It details the transmitter’s features, specifications, hazardous‑location approvals, and communication options (HART or FOUNDATION Fieldbus).\n\nThe document includes step‑by‑step procedures for installation, wiring, intrinsic‑safe and explosion‑proof setups, operation with the infrared remote controller or Model 375 HART communicator, calibration of pH and ORP, programming parameters, routine maintenance, and troubleshooting guidance.
| Housing | Cast aluminum with epoxy coating, Type 4X (IP65) |
|---|---|
| Dimensions | 160.5 mm × 175.3 mm × 161.3 mm |
| Ambient Temperature Range | -4 °F to 149 °F (‑20 °C to 65 °C) |
| Power Supply Voltage | 12 V DC minimum, 42.4 V DC maximum (30 V DC for intrinsically safe operation) |
| Analog Output | Two‑wire 4‑20 mA with superimposed HART digital signal |
| pH Measurement Range | 0 to 14 |
| ORP Measurement Range | -1400 mV to +1400 mV |
| Temperature Resolution | 0.1 °C |
It uses a two‑wire loop delivering a 4‑20 mA current signal with a superimposed HART digital signal.
The transmitter has a robust Type 4X enclosure and an intrinsically safe design for use in hazardous environments when proper safety barriers are applied.
Yes, the 5081‑P can be configured for either pH or ORP measurement and includes separate calibration procedures for each.
A handheld infrared remote controller or a HART Model 375 communicator can be used for programming and calibration.