GTI GTI150 Industrial Pressure Transmitter for Hydropower and Water Resources Applications

Overview

The GTI GTI150 Industrial Pressure Transmitter is a compact, high-reliability piezoresistive pressure sensing device engineered for continuous monitoring and feedback control in demanding hydropower, water resource management, and industrial process environments. It operates on the principle of silicon-based micro-machined strain gauge technology, where applied pressure induces minute mechanical deformation in a silicon diaphragm, resulting in proportional resistance changes converted into a stable, linearized 1–5 V DC analog output signal. Designed specifically for non-corrosive, non-flammable gas media—including compressed air and ambient atmospheric conditions—the GTI150 delivers consistent performance across its three standard configurations: absolute/gauge (0–1 MPa), vacuum (0 to –101 kPa), and bidirectional differential (–100 to +100 kPa). Its robust ABS housing, IP40 ingress protection, and wide operating temperature range (0–50 °C) ensure operational integrity in humid, vibration-prone, and space-constrained installations typical of hydroelectric plant auxiliary systems, dam gate actuation circuits, pump station SCADA interfaces, and municipal water distribution networks.

Key Features

• Ultra-compact form factor: 30 mm × 13 mm × 10 mm with mass ≤50.1 g (including cable), enabling integration into tight-mounting locations without structural reinforcement.
• Piezoresistive silicon sensing element with temperature-compensated signal conditioning circuitry, ensuring stability over the full operating temperature range.
• Multiple pressure port configurations: six standardized mechanical interface options (M3×0.5, M5×0.8, R 1/8 + M5, NPT 1/8 + M5, Φ4 & Φ6 stepped insertion tubes) support rapid field adaptation to existing pneumatic and hydraulic manifolds.
• High metrological fidelity: ±1% full-scale (FS) accuracy (GTI150-□A□□ series), <±0.5% FS linearity, and ±0.2% FS repeatability—validated per ISO 5747 and IEC 61298-2 test protocols under controlled laboratory conditions.
• Low-power operation: consumes <10 mA at 12–24 V DC supply, compatible with battery-backed PLC I/O modules and distributed control system (DCS) analog input cards.
• Chemically resistant wetted materials: SUS304 stainless steel pressure port, lead-free brass (HPb59-1) fittings, and NBR elastomer seals provide compatibility with clean air, nitrogen, and dry instrument gases per ISO 8573-1 Class 4 purity requirements.

Sample Compatibility & Compliance

The GTI150 is validated for use with non-aggressive, non-condensing gaseous media only—including compressed air, nitrogen, argon, and ambient atmospheric air—within specified pressure and temperature limits. It is not rated for liquid media, steam, corrosive gases (e.g., Cl₂, NH₃, H₂S), or explosive atmospheres. The device meets CE marking requirements under the EU Electromagnetic Compatibility Directive 2014/30/EU and Low Voltage Directive 2014/35/EU. While not intrinsically safe or ATEX-certified, its low-energy design (<10 mA, <24 V DC) permits deployment in Zone 2 classified areas when installed per IEC 60079-14 guidelines. For hydropower applications, it supports compliance with IEC 62061 (functional safety of electrical control systems) when integrated into SIL 1-rated subsystems, and aligns with ANSI/ISA-5.1 instrumentation symbology for P&ID documentation.

Software & Data Management

As a two-wire analog transmitter, the GTI150 does not incorporate embedded firmware, network connectivity, or digital communication protocols (e.g., HART, Modbus, or IO-Link). Its 1–5 V DC output is directly compatible with standard 0–5 V or 0–10 V analog input channels on programmable logic controllers (PLCs), data acquisition systems (DAQs), and SCADA RTUs. When deployed in regulated environments—such as water utility QA/QC labs or hydropower generation facilities subject to ISO/IEC 17025 or ANSI/ISO/IEC 17025—users must implement external calibration traceability using NIST-traceable pressure standards and maintain audit-ready records of periodic verification (e.g., annual recalibration per ASTM E74). No software drivers, configuration tools, or cloud platforms are required or provided.

Applications

• Hydropower plant air reservoir and brake system pressure monitoring.
• Gate and valve actuator pneumatic circuit feedback for position-synchronized pressure regulation.
• Water intake and sedimentation basin blower system pressure control.
• Municipal water pumping station dry-run protection and head pressure verification.
• Industrial compressed air network leak detection and demand-side management.
• Environmental monitoring stations measuring barometric pressure differentials across weirs or sluices.

FAQ

Is the GTI150 suitable for submersible or underwater installation?
No. With an IP40 rating, the GTI150 provides only limited protection against solid objects >1 mm and no protection against water ingress. It must be mounted in dry, ventilated enclosures or instrument cabinets.
Can it measure liquid pressure directly?
No. The GTI150 is certified exclusively for gaseous media. Direct contact with liquids may damage the silicon sensor diaphragm and compromise seal integrity.
What is the recommended calibration interval?
For critical hydropower or water infrastructure applications, annual calibration against a certified deadweight tester or digital pressure calibrator is advised. In stable ambient conditions with low cyclic loading, biannual verification may be justified per internal quality procedures.
Does GTI provide NIST-traceable calibration certificates?
Yes—upon request and for an additional fee, GTI issues factory calibration reports traceable to national standards, including as-found/as-left data, environmental conditions, and uncertainty budgets per ISO/IEC 17025 Annex A.3.
Is the 3 m cable shielded or armored?
The standard cable is unshielded, 3-conductor PVC-insulated round cable (Ø3 mm). For EMI-prone environments (e.g., near VFD-driven pumps), users should specify optional braided shielding or install supplemental conduit routing.