HengaoDe HADH-056 Intrinsically Safe Electrostatic Grounding Monitor with Auto-Retractable Cable
| Brand | HengaoDe |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Product Origin | Domestic (China) |
| Model | HADH-056 |
| Price | USD 92 (FOB) |
| Explosion Protection Rating | Ex ia II BT4 |
| Operating Temperature | -40 °C to +60 °C |
| Alarm Sound Pressure Level | >90 dB at 30 cm |
| Loop Resistance Threshold | 50 Ω (configurable) |
| Standby Current | 0.5 mA |
| Alarm Current | 25 mA |
| Battery | 3.6 V Li-ion, 7-year service life |
| Cable Length | Grounding end — 3 m × 2 |
| Enclosure Material | Industrial-grade ABS with IP65 rating |
Overview
The HengaoDe HADH-056 Intrinsically Safe Electrostatic Grounding Monitor is an ATEX- and IECEx-aligned field instrument engineered for continuous real-time verification of electrostatic grounding integrity in hazardous environments classified as Zone 1/Zone 2 (Group II B, T4). It operates on the principle of low-voltage DC loop resistance measurement across the complete grounding path—from static clamp to earth ground rod—ensuring compliance with NFPA 77, API RP 2003, and IEC 60079-14 requirements for flammable liquid transfer operations. Unlike conventional battery-powered alarms relying on disposable alkaline cells, the HADH-056 integrates a certified 3.6 V lithium-ion module with intrinsic safety certification per EN 60079-11, eliminating spark risk during battery replacement and supporting uninterrupted 24/7 monitoring without user intervention. Its auto-retractable spiral cable design (5 m vehicle-end + dual 3 m grounding leads) reduces trip hazards and improves site housekeeping while maintaining mechanical durability under repeated extension/retraction cycles.
Key Features
- Intrinsically safe design certified to Ex ia II BT4 per EN 60079-0 and EN 60079-11, suitable for use in petrochemical terminals, paint spray booths, solvent blending areas, and pharmaceutical manufacturing suites.
- True zero-touch operation: no power switch, no manual reset—automatic loop continuity verification every 2 seconds with immediate audible/visual alarm upon resistance deviation exceeding preset threshold (default 50 Ω, configurable via factory calibration).
- High-fidelity acoustic alert (>90 dB at 30 cm) combined with dual-color LED status indicators (green = OK, red = fault) ensures clear operator feedback even in high-noise industrial settings.
- Ultra-low power architecture: standby current ≤0.5 mA enables 7-year battery service life under typical usage; battery health is monitored internally and reported via LED flash pattern during startup.
- Ruggedized housing rated IP65 with UV-stabilized ABS enclosure resists chemical splashes, dust ingress, and mechanical impact per IK07 standard.
- Self-aligning stainless-steel grounding clamps with serrated jaws ensure stable contact on painted, corroded, or coated surfaces without requiring surface preparation.
Sample Compatibility & Compliance
The HADH-056 is validated for use with grounded metal containers, ISO tankers, railcars, drum trucks, and portable IBCs carrying Class I liquids (e.g., gasoline, ethanol, acetone, toluene). It meets the electrical safety requirements of OSHA 1910.106, NFPA 30, and CENELEC CLC/TR 50427 for static mitigation in bulk transfer operations. All internal circuitry conforms to EN 61000-6-2 (immunity) and EN 61000-6-4 (emissions), ensuring reliable performance in electrically noisy refinery or terminal environments. The device carries CE marking under the ATEX Directive 2014/34/EU and is compliant with IEC 60079-14:2013 Annex D for grounding verification methodology.
Software & Data Management
While the HADH-056 operates as a standalone hardware monitor without embedded firmware updates or cloud connectivity, its analog alarm output (open-collector NPN) supports integration into facility-wide safety systems via PLC or DCS interfaces. Optional data logging adapters (sold separately) enable timestamped event capture—including alarm activation duration, cumulative uptime, and battery voltage trends—for GLP/GMP audit trails. All calibration records and certificate of conformance are provided with each unit and comply with ISO/IEC 17025 traceability requirements through accredited third-party laboratories.
Applications
This monitor is routinely deployed in:
- Flammable liquid loading/unloading bays at refineries and fuel depots;
- Solvent-based coating and adhesive manufacturing lines;
- Pharmaceutical active ingredient (API) handling zones where powder charging poses ignition risk;
- Chemical distribution centers managing Class IIIA/B combustibles;
- Aviation fuel hydrant systems requiring continuous grounding validation prior to refueling;
- Paint and ink formulation facilities subject to EPA Method 25B and EU ATEX zoning regulations.
FAQ
Is the HADH-056 certified for use in Zone 0 environments?
No. It is rated Ex ia II BT4 for Zone 1 and Zone 2 only. Zone 0 requires higher protection levels (e.g., Ex ia IIC T4) not supported by this model.
Can the resistance threshold be adjusted in the field?
Threshold adjustment requires factory recalibration using certified reference resistors and is not user-configurable. Default setting is 50 Ω per NFPA 77 Annex B recommendations.
Does the device support remote diagnostics or firmware updates?
No. As an intrinsically safe passive monitoring device, it contains no microprocessor, wireless interface, or upgradable firmware—ensuring maximum reliability and regulatory acceptance.
What maintenance is required during its 7-year service life?
Annual visual inspection of cable integrity and clamp jaw condition is recommended. No periodic calibration is mandated unless subjected to physical damage or abnormal environmental stress.
Is third-party certification documentation included with shipment?
Yes. Each unit ships with an EC-Type Examination Certificate (issued by CNEX or equivalent Notified Body), Declaration of Conformity, and calibration report traceable to NIST standards.
