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HART command set, device variable map and status decoding for the Pisonics PS7000 ultrasonic slurry density meter.
The PS7000 is a HART 5 slave. Bell 202 FSK at 1200 bps is superimposed on 4–20 mA loop 1, so the analogue reading is unaffected while HART is in use.
- 📖 Command set — every command the device answers, with payloads
- 🔢 Device variables — what PV and SV carry, and their units
- 🩺 Status and command 48 — decoding the extended device status
- 🔌 Loop and wiring notes
Also available over Modbus RTU — see ps7000-modbus, which carries far more diagnostic detail than the HART variable set does.
- Wire the instrument's loop 1 into the HART loop. Loop resistance must be 230–1100 Ω for the FSK signal to develop.
- Poll address 0 by default (point-to-point, loop current follows PV).
- Issue command 0 to discover the device, then command 3 to read the loop current together with PV and SV in one transaction.
Command 0 -> identity (manufacturer, device type, device ID, revisions)
Command 3 -> 4-20 mA current + PV (concentration) + SV (probe temperature)
Command 48 -> extended status (the full error words, see docs/status.md)
| Variable | Quantity | Source |
|---|---|---|
| PV | Main process value — concentration or density, as configured | Filtered main value |
| SV | Probe (process) temperature, °C | PT1000 in the sensor |
The loop current reported is always loop 1, because that is where the FSK is modulated. The percent-of-range figure, however, follows whichever loop is mapped to the main value — those can be different loops, and confusing them is a common source of "the percentage does not match the current" reports.
A registered Device Description is not published here yet.
DD files are registered with the FieldComm Group and keyed on a manufacturer ID plus device type code, both of which FieldComm assigns to members. Until that allocation is in place, any DD we published would carry a placeholder manufacturer ID — which would collide with whoever actually holds that code and could not be registered.
Everything a host needs to talk to the instrument without a DD is documented here. If your host requires a DD to add the device, contact info@pisonics.com and tell us which host you are using.
- HART 5, not 6 or 7. No burst mode, no device variables beyond PV/SV via the universal commands, no long-frame addressing.
- Two dynamic variables. The rich diagnostics — entrained-gas index, signal quality, energy, per-loop detail — are on Modbus, not HART. If your control system needs those, plan for RS485 alongside or instead.
- Write commands are limited to tag, descriptor, date, message, polling address and final assembly number. Ranging, damping and calibration are set from the front panel or over Modbus, not over HART.
Pisonics builds inline density and concentration meters for mining, power, chemical processing and dredging. The PS7000 measures slurry density by acoustic impedance across DN50–DN1000 with no radioactive source.
- Product page — https://www.pisonics.com/products/PS7000
- How it works — https://www.pisonics.com/guides/acoustic-impedance-explained
Documentation licensed CC BY 4.0.