Product Introduction
The ZH3000 series eddy current sensors inherit many advantages from ZH&H's earlier products, possessing advanced performance similar to the DWQZ series, while also ensuring interchangeability of components (recalibration is required after interchange). The mounting utilizes an advanced high-density DIN rail insulated mounting bracket, saving half the space compared to screw mounting. We also provide screw-mount insulated bases that match the mounting positions of earlier products, making installation and maintenance more convenient and efficient.
Thanks to the adoption of new materials and processes, the ZH3000 series eddy current sensor system has improved linearity and frequency response by several percentage points. It also meets the American Petroleum Institute (API) 670 standard (fourth edition) for similar products.
The intrinsically safe design has received authoritative certification from a national-level explosion-proof testing institution, with explosion-proof ratings of ExiaⅡCT2~T6, making it fully capable of operating in any hazardous environment. Its excellent static stability allows for long-term monitoring of equipment displacement, and its wide frequency response enables the measurement of physical states such as shaft vibration and rotational speed in rotating machinery.
To meet the needs of various measurement schemes, we offer a variety of eddy current sensors. If classified by probe specifications (diameter), they can be divided into three specifications: ZH3000Φ8mm, ZH3000Φ11mm, and ZH3000Φ25mm. If classified by the total length of the system cable (probe cable length + extension cable length), they can be divided into two types: 5m and 9m.
Features
1. System Composition
The ZH3000 series eddy current sensor consists of three parts: the ZH3000 probe, the ZH3000 extension cable, and the ZH3000 preamplifier .
ZH3000 probe
The probe consists of an inductor, protective cover, stainless steel housing, high-frequency cable, high-frequency connector, etc. Depending on the measurement range, probes of different diameters (e.g., Φ8mm, Φ11mm, Φ25mm) can be selected; depending on the installation requirements, probes of different installation methods (e.g., upright, reverse, threadless) and 1m or 0.5m cable lengths can be selected.
ZH3000 Extension Cable
Both ends of the extension cable are equipped with SMA self-locking plugs, one end of which is fitted with an oil-proof protective sleeve to protect the self-locking plug from oil contamination, thereby improving system reliability. The extension cable is available in four lengths: 4m, 4.5m, 8m, and 8.5m.
ZH3000 preamplifier
The preamplifier is the core component of the system. It includes circuits for oscillation, linear detection, filtering, linear compensation, and amplification of the entire sensor system. Together with the extension cable and probe, it constitutes the ZH3000 series eddy current sensors of various specifications. Based on the diameter of the probe used, the ZH3000 preamplifier is available in three sizes: Φ8mm, Φ11mm, and Φ25mm. Based on the total cable length (probe cable length + extension cable length), the ZH3000 preamplifier is available in two types: 5m and 9m.
2. Main Technical Parameters
| Sensor model | ZH3000 Φ8 mm | ZH3000 Φ11 mm | ZH3000 Φ25 mm |
| Probe diameter (mm) | 8 | 11 | 27.1 |
| Static linear range (mm) | 2 | 4 | 12.7 |
| Static sensitivity (V/mm) ≤1.0% | 8 | 4 | 0.8 |
| Static amplitude linearity | ±2.0% | ±5.0% |
| Dynamic amplitude linearity | ±10% |
| Interchangeability error | ±5% |
| Static zero error | 0.5% |
| Static amplitude stability | 0.5% |
| Dynamic reference sensitivity error | 3.0% |
| Static amplitude repeatability | 1.0% |
| Frequency response | (0～15)kHz(0.5dB) (0～8)kHz(0.5dB) (0～3)kHz(0.5dB) |
| System temperature drift | 0.1% |
| Measurement range: midpoint gap (mm) ±5% | 1.8 | 3 | 9 |
| Measurement range: Midpoint voltage (V) ±5% | -10 | -10 | -7.08 |
| Material and shape of the object being tested | Metal materials, with 45# steel as the reference material; shaft, plane, and measuring disc on the shaft. |
| The diameter of the shaft is not less than (mm). | 80 |
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| The diameter of the measuring disc is not less than (mm). | 18 | 30 | 70 |
| Power supply voltage (V) | (-20 ~ 26)Vdc |
| Power consumption (mA) | 12 | 12 | 15 |
| Output load | 10kΩ |
| Ambient temperature during calibration | (20±5)℃ |
| storage temperature | preamplifier | -35 ℃～+100℃ |
| probe | -40 ℃～+177℃ |
| cable | -40 ℃～+177℃ |
| use temperature | preamplifier | -30 ℃～+70℃ |
| probe | -40 ℃～+150℃ |
| cable | -40 ℃～+150℃ |
| Total system weight (standard configuration) | 500g ±3% | 700g ±3% |
| System cable total length ±10% | 5 m or 9 m |
| Extend cable length ±5% | 4ｍ , 4.5ｍ, 8ｍ, 8.5ｍ |
| Probe cable length ±5% | 1 m, 0.5 m |
| Relative humidity (with joint protection, no water immersion) | 100 % condensation |
| Altitude restrictions | <2000m |
| Normal working environment | No strong magnetic field, no corrosive vapor or liquid, no strong vibration source |
| Hazardous working environment | Hazardous locations in Zones 0, 1, and 2 of explosive gas mixtures of Class IIA to IIC and Groups T1 to T5. |
| Enclosure protection rating: | IP20 or higher |
| Maximum surface temperature of sensor housing | The temperature must not exceed 135℃. |
| Insulation resistance | >500MΩ |
| Insulation strength | >500V |
Mechanical properties
■ Probe material: Polyphenylene sulfide (PPS)
■ Shell material: 1Cr18Ni9Ti
■ Cable material: Coaxial shielded with FEP outer sheath
■ Connector material: Brass or beryllium bronze plated with gold
■ Preamplifier material: ADC12
■ Armor material: High-elasticity AISI302SST stainless steel strap, with FEP outer skin
■ Probe tensile strength: Maximum 30 kg between the protective cover and the housing; maximum 20 kg between the protective cover and the connector.
■ Minimum bending radius of cable: 25.4mm
■ Minimum bending radius of armored cable: 30mm
