Summary of "Pressure Transmitter Workshop Re-range - [HART 475 / Fluke 789 / Druck DPI610 / Foxborough TX]"

Pressure transmitter re-range and calibration check (tutorial)

Purpose

Demonstrates re-ranging a Foxborough IG10P pressure transmitter from 0–10 bar to 0–5 bar and performing a 5‑point calibration check.

Test equipment used

Druck DPI 610 IS — pressure source/calibrator (pressure application and pump)
Fluke 789 ProcessMeter — provides 24 V loop power and reads mA output
HART 475 field communicator — HART configuration and send-to-instrument
Mechanical adapters/tubing — 1/2” NPT to 1/4” Gyrolok adapter, PTFE tape, small‑bore tubing and olive fitting
Paper calibration/check sheet (5‑point)

Procedure (high level)

Mechanical connections
- Removed transmitter back plate and wired two leads to the Fluke 789.
- Fitted a 1/2” NPT → 1/4” Gyrolok adapter; used PTFE tape on the NPT threads and tightened with wrenches.
- Connected Gyrolok tubing to the Druck DPI 610.
Pressure application and leak check
- Pressurized with the DPI (air used in demo; hydraulic pump recommended for higher pressures).
- Held at 5 bar briefly to confirm no significant leak, then vented.
Loop powering and initial readings
- Fluke 789 set to loop‑power (mA source); red to positive, black to negative.
- Observed ~3.99–4.00 mA at atmospheric pressure (expected 4.00 mA for 0 bar on a 0–10 bar range).
HART re-range (PV rearrange)
- Connected HART 475 to HART pins and went online.
- Confirmed LR = 0 bar and URV = 10 bar.
- Navigated: Device setup → Calibrate → PV rearrange → edited URV to 5 bar → pressed Send to write to instrument.
- Returned the loop to auto and disconnected the HART communicator.
5‑point calibration check
- Applied pressures: 0.00, 1.25 (25%), 2.50 (50%), 3.75 (75%), 5.00 (100%) bar.
- Technique:
  - Use coarse then fine adjust on the DPI; approach setpoints from below to minimize hysteresis.
  - Allow settling time (transmitter filtering can slow response).
- Recorded mA readings (rounded to two decimals). Typical measured errors were around −0.01 to −0.02 mA.
Shutdown
- Powered down equipment and removed connections; transmitter is ready for field use.

Error calculation and results

Span = 20 mA − 4 mA = 16 mA
Percent error = (mA error / 16 mA) × 100
Example: a 0.01 mA error → (0.01 / 16) × 100 = 0.06% a 0.02 mA error → (0.02 / 16) × 100 = 0.13%
These are very small errors and are within acceptable calibration limits shown in the tutorial.

Note: The HART communicator shows a star next to URV/LRV when changes are staged in the communicator but not yet written — you must press Send to commit the changes to the instrument.

Practical tips and notes

Use PTFE tape on NPT threads to prevent leaks.
Use a hydraulic pump for higher pressures (air is slow/inefficient for high pressures).
Avoid overshooting setpoints and then coming back down; approach setpoints from below to reduce hysteresis effects.
Use the fine adjust on the pressure source for precise setpoints.
Allow time to settle because transmitter filtering can slow the response.
The DPI could supply loop power, but the demo used the Fluke 789 for loop power and mA readout.

Devices/brands referenced

Foxborough IG10P (pressure transmitter)
Druck DPI 610 IS (pressure calibrator)
Fluke 789 ProcessMeter (loop power and mA measurement)
HART 475 field communicator (HART device configuration)

Main speaker / source

Tutorial instructor / demonstrator (unnamed narrator in the video)
Equipment manufacturers: Foxborough (transmitter), Druck (DPI 610), Fluke (789), and HART (475 communicator)