Holykell HPT604 High-Pressure Submersible Sensor
The Holykell HPT604 is a high-pressure submersible sensor designed for accurate liquid level monitoring in water, fuel, and diesel applications. Built with a 316L stainless steel body and IP68-rated protection, it offers reliable performance in harsh environments. Available with ±0.25% or ±0.5% accuracy and supports gauge, absolute, or sealed pressure types.
OVERVIEW
Description
The Submersible Water Level Sensor is a versatile and durable hydrostatic level transmitter designed for reliable performance in a wide range of industrial liquid-level measurement applications. Engineered with a high-quality imported piezoresistive sensing element, the sensor features a robust 316L stainless steel body, welded diaphragm, and a vented hydrometric cable for accurate pressure compensation.
Its IP68-rated fully sealed construction ensures long-term stability even under harsh conditions, making it a cost-effective solution with a service life of over 10 years in continuous submersion.
🔧 Key Advantages
-
316L Stainless Steel All-Welded Housing
Corrosion-resistant design ensures long-term durability in harsh environments. -
Innovative 8-Port Pressure Inlet Design
Enhances response time and minimizes clogging risk in sediment-heavy liquids. -
IP68 Fully Sealed Waterproof Construction
Provides maximum protection against water ingress and long-term submersion. -
Resistant to Shock and Erosion
Built for rugged industrial applications and turbulent flow environments. -
Optional Built-in Lightning Protection
Adds another layer of safety for outdoor and storm-prone installations.
📍 Authorized U.S. Distributor
QuakeLogic Inc.
SPECIFICATIONS
Technical Specifications
Pressure Range:
- 0.5 to 500 meters H₂O (customizable)
- Note: Maximum range for SDI-12 signal is 80 meters
Output Signal Options:
- Analog: 4–20 mA, 0–5 V, 1–5 V, 0–10 V, 0.5–4.5 V
- Digital: SDI-12, RS485 (Modbus RTU)
Power Supply Options:
- 5 VDC, 7–30 VDC, 8–30 VDC, 12 VDC, 13–30 VDC, 3.5–36 VDC
Accuracy:
- Standard: ±0.5% Full Scale (F.S.)
- Optional: ±0.25% F.S. (customized)
Operating Temperature:
- -40°C to +80°C (for non-corrosive media)
Temperature Compensation:
- 0°C to +80°C
Zero Temperature Drift:
- ≤0.2% F.S./°C (≤100 kPa)
- ≤0.1% F.S./°C (>100 kPa)
Full-Scale Temperature Drift:
- ≤0.02% F.S./°C (≤100 kPa)
- ≤0.01% F.S./°C (>100 kPa)
Electrical Connection:
- Fixed cable with IP68-rated waterproof protection
Response Time:
- ≤10 milliseconds
Cable Options:
- Vented PE, PUR, or FEP cables
Certifications:
- CE
- RoHS
APPLICATIONS
Applications
- Hydrostatic level measurement
- Water pressure level measurement
- Deep well and groundwater monitoring
- Sea water level measurement and control
- Borehole water level measurement
- Level measurement in pumping station
INSTALLATION INSTRUCTIONS

















