Product manual
YD9800 eddy-current displacement sensor
Probe and driver selection, matched cable lengths, target calibration and source-stated installation constraints.
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The certificate number CNEX14.XXXX is a placeholder and cannot verify certification. The text also refers to JX20 without establishing its relation to YD9800. Internal differences require confirmation: the introduction lists Li = 100 µH while later specifications list 100 mH; introductory temperature claims reach +150 °C for the probe and +105 °C for the driver, while the technical table limits both to −50 to +60 °C. Do not select an operating or intrinsic-safety limit from these conflicting entries.
Non-contact measurement system
YD9800 measures the distance between a probe face and a conductive metal target. A matched probe, cable system and driver support displacement, shaft vibration and speed-related measurements. The source also illustrates axial displacement, shaft orbit, keyphasor/speed, surface irregularity and thickness applications. These applications require a suitable target and measurement arrangement.
The probe uses a PPS head and sealed coil. The driver supplies signal conditioning and either negative-voltage or 4–20 mA output, according to the selected version. Target material influences the response; standard driver calibration uses 40CrMo steel. Specify a different target material when ordering so calibration can use that material.
Choose probe diameter and linear range
The manual recommends a linear range at least 20% greater than the target's maximum movement. A larger linear range is preferred unless target area or installation space prevents it.
| Probe diameter | Linear range | Stated nonlinearity | Minimum target diameter |
|---|---|---|---|
| 5 mm | 1 mm | Within ±1% | 15 mm |
| 8 mm | 2 mm, extendable to 4 mm | Within ±1% | 15 mm |
| 11 mm | 4 mm, extendable to 8 mm | Within ±1% | 35 mm |
| 25 mm | 12 mm | Within ±1.5% | 50 mm |
| 50 mm | 25 mm | Within ±2% | 100 mm |
The separate probe-selection table gives head lengths of 5, 5, 11, 23 and 37 mm respectively for those diameters. The minimum target sizes above follow this YD9800 source and must not be replaced with the values for integrated YDYT9800.
Electrical and response specifications
The technical table states 0–10 kHz response, with amplitude changes of −1% at 1 kHz and −5% at 10 kHz. It states a −1° phase entry at 1 kHz, but its 10 kHz phase text is malformed; no corrected phase limit is inferred. Interchangeability error is at most 5%. The probe and driver temperature-drift entry is at most 0.05%/°C.
| Output type | Supply through safety barrier | Consumption entry |
|---|---|---|
| Negative voltage, code V | −18 to −26 V DC | At most 12 mA, excluding output current |
| 4–20 mA, code I | +18 to +30 V DC | At most 12 mA, excluding output current |
The introduction separately claims long-term driver stability of 0.02% per year. The source mentions negative-voltage compatibility with Bently Nevada BN3300/7200 and Philips equipment, but does not establish a complete interchangeable system for every configuration.
Select threads, housing and mounting style
| Probe diameter | Metric thread listed | Imperial thread listed |
|---|---|---|
| 5 mm | M8 × 1 | 1/4–28 |
| 8 mm | M10 × 1 | 3/8–24 |
| 11 mm | M14 × 1.5 | 1/2–20 |
| 25 mm | M30 × 2 | 1.25–12 |
| 50 mm | M14 × 1.5 | 1/2–20 |
Other thread choices are permitted by the source. Standard mounting is normally selected unless an external bracket or limited space calls for another style. Reverse mounting is described for an external sleeve arrangement and for the 50 mm probe. Side-exit cable and flange mounting are alternatives when axial space is limited; the former normally uses a clamping block, the latter bolts.
Unthreaded length is selectable from 0 to 250 mm in 10 mm steps, with codes 00 through 25. Housing length is 20–250 mm in 10 mm steps, with codes 02 through 25. Choose housing length from the mounting position to target distance. An unthreaded section reduces how far the probe must be screwed into a tapped hole. The actual assembly geometry must be confirmed using the selected mounting drawing.
Match probe, cable and driver
Cable examples are code 05 = 0.5 m, 10 = 1.0 m, 50 = 5.0 m and 90 = 9.0 m. For a threaded-hole installation, the source recommends a 0.5 or 1.0 m probe cable so it can rotate with the probe without twisting. Add the appropriate extension cable so the probe-cable-plus-extension total is 5 or 9 m.
For a probe installed inside the machine, choose sufficient probe cable length to locate the connector outside the machine and avoid oil contamination. Select K armor when the cable has no protective conduit.
The driver must match the probe diameter: codes 05, 08, 11, 25 and 50 correspond to 5, 8, 11, 25 and 50 mm probes. Driver cable-length code 50 matches a 5 m system and 90 a 9 m system. Select V or I for the required output and supply polarity.
The source example CWY-DO-9800T08-M10×1-B-01-05-50 describes an 8 mm probe, M10 × 1 thread, standard mounting, 10 mm unthreaded length, 50 mm housing and 5 m cable without armor. This is the example's naming format, not an inferred replacement model.
Protection information and unresolved limits
The source states the marking Ex ia IIB T6 Ga and references GB3836.1-2010, GB3836.4-2010 and installation standard GB3836.15-2000. It claims use in Zones 0, 1 and 2, gas groups IIA–IIB and temperature classes T1–T6, but its placeholder certificate number does not substantiate that claim. Confirm the actual certificate and configuration before relying on it.
The repeated entity entries are Ui = 24.0 V DC, Ii = 50 mA, Pi = 1.2 W and Ci = 0.22 µF. Li is inconsistent between 100 µH and 100 mH. This unresolved inductance prevents this text from establishing a definitive barrier match.
The source's matching conditions are Uo ≤ Ui, Io ≤ Ii, Po ≤ Pi, Cc ≤ Co − Ci and Lc ≤ Lo − Li; an isolated barrier is preferred. Avoid housing friction or impact that can create sparks. These are source instructions, not a current certification assessment.