DatasheetDruck PTX661 – High-Performance Hammer Union Pressure Transmitter for Oil & Gas Drilling
The Druck PTX661 Hammer Union Pressure Transmitter has been specifically designed to provide accurate and reliable pressure measurement in extremely harsh oil and gas drilling environments. Its rugged construction makes it particularly suitable for onshore and offshore drilling operations where high mechanical shock, severe vibration, and dynamic pressure fluctuations are frequently encountered.
The PTX661 incorporates Druck’s proprietary high-accuracy silicon pressure sensing technology, combined with rugged mechanical construction and proven 4–20 mA electronics. Its fully encapsulated design provides exceptional reliability and measurement stability in demanding drilling applications.
High-Accuracy Pressure Measurement up to 15,000 psi
The PTX661 offers a measurement accuracy of ±0.1% full scale (FS), providing precise and repeatable pressure readings for demanding high-pressure drilling applications.
Standard operating pressure ranges include:
- 0 to 5,000 psi, sealed gauge
- 0 to 6,000 psi, sealed gauge
- 0 to 10,000 psi, sealed gauge
- 0 to 15,000 psi, sealed gauge
- 0 to 200 bar, sealed gauge (PTX661-*-8547 only)
- 0 to 500 bar, sealed gauge (PTX661-*-8547 only)
Additional pressure ranges and absolute pressure versions are available on request.
Fast Response for Dynamic Pressure Measurement
The PTX661 utilizes advanced low-volume oil-fill technology, enabling a fast frequency response exceeding 2 kHz.
This technology supports accurate monitoring of rapid pressure changes and dynamic pressure conditions commonly encountered in drilling mud systems and high-pressure hydraulic applications.
Rugged Construction for Extreme Shock and Vibration
The PTX661 is engineered for exceptionally demanding mechanical environments. Its fully encapsulated sensor construction provides excellent resistance to severe shock and vibration.
The rugged Hammer Union design supports dependable pressure measurement in oil and gas drilling equipment subjected to continuous mechanical stress and dynamic loading.
High Overpressure Capability and Pressure Containment
The PTX661 provides high mechanical pressure resistance for demanding high-pressure applications.
- Overpressure capability: 1.5 times full scale, maximum 20,000 psi (1,380 bar)
- Pressure containment: 2 times full scale, maximum 20,000 psi (1,380 bar)
These characteristics contribute to reliable pressure measurement in hydraulic systems exposed to high operating pressures and demanding pressure conditions.
Proven 4–20 mA Electronics with Integrated Protection
The PTX661 incorporates proven 4–20 mA signal conditioning electronics housed within a rugged enclosure.
Integrated protection features include:
- Power supply regulation
- Reverse polarity protection
- Overvoltage protection
- Electromagnetic compatibility (EMC) protection
The standardized analog output enables integration into industrial monitoring, measurement, and control systems used in drilling operations.
NACE-Compatible Wetted Materials
The PTX661 features wetted components manufactured from 316L stainless steel, Inconel X750, and Inconel 625. According to the manufacturer, these materials are compatible with NACE MR0175 requirements.
The transmitter is suitable for pressure media compatible with these materials. Actual media compatibility should be evaluated based on the specific process conditions and fluid composition.
Intrinsically Safe Versions for Hazardous Areas
The PTX661 is available with intrinsically safe approvals for use in potentially explosive atmospheres commonly encountered in oil and gas drilling operations.
Available certification systems include:
- ATEX
- IECEx
- NEPSI
- FM approval for the United States and Canada
The PTX661 is also CE marked. Hazardous area approval availability depends on the selected transmitter configuration.
Repairable Design
The PTX661 features a repairable construction, allowing suitable units to be serviced and restored when necessary. This provides an additional advantage for demanding drilling applications where equipment reliability and long-term serviceability are important.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Druck |
| Model | PTX661 |
| Device type | Hammer Union high-pressure transmitter |
| Applications | Onshore and offshore oil and gas drilling |
| Sensing technology | High-accuracy silicon pressure sensor |
| Standard pressure ranges | 0–5,000, 0–6,000, 0–10,000, and 0–15,000 psi |
| Additional pressure ranges | 0–200 and 0–500 bar (PTX661-*-8547 only) |
| Pressure reference | Sealed gauge (SG) |
| Absolute pressure versions | Available on request |
| Measurement accuracy | ±0.1% FS |
| Dynamic response | Exceeding 2 kHz (manufacturer specification) |
| Sensor technology | Low-volume oil-filled silicon sensing element |
| Output signal | 4–20 mA |
| Overpressure capability | 1.5 x FS, maximum 20,000 psi (1,380 bar) |
| Pressure containment | 2 x FS, maximum 20,000 psi (1,380 bar) |
| Wetted materials | 316L stainless steel, Inconel X750, and Inconel 625 |
| Material compatibility | NACE MR0175 |
| Process connection | Hammer Union |
| Mechanical resistance | Designed for high shock and vibration environments |
| Construction | Fully encapsulated |
| Power supply regulation | Integrated |
| Reverse polarity protection | Included |
| Overvoltage protection | Included |
| EMC protection | Included |
| Hazardous area approvals | ATEX, IECEx, NEPSI, FM (United States and Canada) |
| CE marking | Included |
| Repairability | Repairable |
Typical Applications
Onshore Oil and Gas Drilling
Precise pressure monitoring in land-based drilling rigs and hydraulic drilling systems operating under high-pressure and high-vibration conditions.
Offshore Drilling Operations
Reliable high-pressure measurement in offshore drilling equipment requiring rugged sensor construction and comprehensive electrical protection.
Drilling Mud Pressure Monitoring
Monitoring of drilling mud pressure under high operating pressures and dynamic conditions. The fast frequency response supports the detection of rapid pressure fluctuations.
High-Pressure Hydraulic Systems
Pressure measurement in demanding hydraulic applications exposed to severe mechanical loads and dynamic pressure changes.
Drilling Equipment and Process Monitoring
Integration into industrial monitoring and control systems for continuous measurement of critical pressure parameters during drilling operations.
Summary
The Druck PTX661 combines ±0.1% FS measurement accuracy with fast-response silicon sensing technology, rugged Hammer Union construction, and reliable 4–20 mA electronics. Featuring high-pressure capability, NACE-compatible wetted materials, and available intrinsically safe certifications, it provides a dependable solution for demanding pressure measurement applications in onshore and offshore drilling operations.
