PRX-300 Proximity Probe TesterAutomated DC linearity testing on the AT2040
Clamp the probe and press start. The PRX-300 moves a 4140 steel target through the probe's range while the AT2040 records every point, judges every 10 mil segment against API 670 limits and saves a PDF test report. No micrometer, no hand calculations, and the same result whoever runs the test.
Why automate the probe test
API 670 limits apply to every incremental scale factor. The PRX-300 checks each 10 mil segment on its own, so a good average can't hide a bad one.
Segment ISF repeats within ±0.75 % (95 %) even with the probe taken out and re-seated, and the average ISF within ±0.17 %.
Every test ends with PASS or FAIL and a PDF report with the data, charts and serial numbers, ready to file with the asset record.
How a test runs
The probe stays fixed in its holder. The PRX-300 moves the target to it and back while the AT2040 powers the driver and reads its output.
- HomeThe target goes to its home reference before every test.
- Find the probeThe target travels in and settles on the −1 V start point.
- SweepTen points 10 mil apart, each settled and averaged before it is read.
- JudgeEvery segment ISF, the average ISF and the DSL against your limits.
- Check and reportThe target returns home, checks for screw slip and saves the PDF report.
Try the Prox DC test
This is the Prox DC Linearity Test screen on the AT2040. Press Start Test, pick the acceptance criteria and watch the sweep.
- Live DC voltage while the target moves
- Each point plotted as it is read
- Report, ISF plot, table and curve views
- Switch to the bad probe: one segment out of tolerance fails the test, even with a good average
Specifications
| Range | 0–90 mil in 10 mil steps |
| Probes | Adjustable clamp for probe bodies 5 mm to 19 mm (3/16 to 3/4 in) diameter |
| Judged | Every 10 mil segment ISF, average ISF (10–90 mil) and DSL; 1–5 m and 9 m system presets |
| Repeatability | Segment ISF ±0.75 % (95 %) with the probe re-seated; average ISF ±0.17 % |
| Protection | Homes before every test, protected travel, screw slip check after every test |
| Targets | AISI 4140 supplied; 4340, 1018 / 1045, 410, 416, 17-4 PH, 304 / 316 and Inconel 718 available |
| Records | PDF test report and CSV for every probe, USB export; calibration certificate supplied |
| Works with | AT2040 portable vibration calibrator |
| Weight | 900 g |
| In the case | PRX-300, 12 V supply and 4140 steel target in a Pelican 1400 case with custom foam |
Repeatability measured by Agate on one 8 mm probe system. Specifications subject to change. API 670 is a standard of the American Petroleum Institute.
Download the full PRX-300 datasheet (PDF, 300 KB) →
Where it's used
Prove the probe, extension cable and driver work as a set before the machine is handed over.
Check new or repaired transducer systems against their published ISF and DSL.
Re-run the same test on the same limits and file the PDF report with the asset record.
PRX-300 or the PRX-100 kit?
Both test proximity probe systems against a 4140 target. The PRX-300 automates the linear (DC) test and the paperwork; the PRX-100 adds the dynamic test on the shaker. Many labs use both.
| Compare | PRX-300 | PRX-100 kit |
|---|---|---|
| What it is | Motorised tester that runs from the AT2040 touchscreen | Micrometer fixture that mounts on the calibrator's front panel |
| Linear (DC) test | Automatic 0–90 mil sweep in 10 mil steps, every point settled and recorded | Manual: turn the micrometer and record the gap voltage at each step |
| Dynamic (AC) test | No, use the PRX-100 on the shaker | Yes, the calibrator vibrates the target at machine speed |
| Judging | Every segment ISF, the average ISF and the DSL judged against API 670 limits, PASS / FAIL | You work out the ISF from your readings with the Excel template |
| Probe test certificate | PDF made automatically at the end of every test, no user input. CSV too, USB export | Made by hand from your readings in the Excel template |
| Probe sizes | Adjustable clamp, any body from 5 to 19 mm | Arm clamps for 6, 8 and 10 mm, ¼" and ⅜" |
| Target | 4140 supplied; other materials available | 4140 |
| Works with | AT2040 | AT2040 or AT2030 |
| Best for | Repeatable linearity tests and records for many probes | Field checks and dynamic response at machine speed |
See the PRX-100 proximity probe calibration kit for dynamic tests on the AT2040 or AT2030.
Questions
Which probes does the PRX-300 test?
Eddy-current proximity probes with bodies from 5 mm to 19 mm (3/16 to 3/4 in) diameter. The holder is an adjustable clamp, so any size in that range fits, not just a few fixed sizes.
What does it measure?
It steps the gap from 0 to 90 mil in 10 mil steps and records the driver output at each point. The AT2040 works out the incremental scale factor (ISF) of every 10 mil segment, the average ISF and the deviation from a straight line (DSL), and judges each one against your limits.
Why judge every segment and not just the average?
API 670 limits apply to every incremental scale factor. A probe can have a good average and still have one segment out of tolerance, and the PRX-300 reports that segment as a fail.
Which calibrator does it need?
The PRX-300 runs from the AT2040 portable vibration calibrator, which powers the probe driver, reads its output and controls the test from the touchscreen.
What target material is used?
AISI 4140 steel is supplied, the material most probe systems are calibrated for. Targets in 4340, 1018 / 1045, 410, 416, 17-4 PH, 304 / 316 and Inconel 718 are available, and the target material is recorded on the report.
What do I get at the end of a test?
A PASS or FAIL result and a PDF test report with the data, the charts and the probe, cable and driver serial numbers, plus a CSV of the raw data. Both can be exported to a USB drive.
See the PRX-300 on your probes
Tell us which probe systems you test and how many, and we'll quote the PRX-300 or arrange a short demo. The brochure is available on request.
Request a quote WhatsApp +1 760-215-9670 Talk to an engineer