Description

The Hydran 201Ti (including the Mark IV generation) is a compact, online smart transmitter designed for early fault detection in oil-filled power transformers. Installed directly onto a single transformer tank valve, the transmitter continuously samples insulating oil via a gas-permeable membrane to provide a single composite reading of key fault gases.

Commercial Availability & Procurement

• Condition: New Original (Factory Sealed) or Refurbished (Fully Bench-Tested, Cleaned, and Sensor Verified)
• Warranty: 12-Month Comprehensive Industrial Warranty
• Lead Time: Ships within 1–3 business days from stock availability
• Pricing Note: Listed price is indicative and varies based on localized configuration options and sensor age. Contact our team for a firm quote.

Technical Specifications

Field Experience & Engineering Insights

Composite Gas Sensing Architecture

In field deployments, the Hydran 201Ti acts as a front-line defensive monitor for small to medium-sized transmission transformers. Rather than breaking down precise chromatography levels like an multi-gas DGA analyzer, the 201Ti uses an electrochemical cell that responds primarily to Hydrogen (H_2)—the key indicator gas for partial discharge and arcing—and Carbon Monoxide (CO), which signals thermal degradation of internal insulation paper.

• No Moving Parts: The transmitter features an passive configuration with no internal pumps, motors, or auxiliary external piping, reducing mechanical failure modes.
• Membrane Safety: The internal diffusion membrane is engineered to withstand full transformer vacuum operations. However, during oil sampling or system retrofits, venting procedures must be strictly followed to prevent localized vacuum pockets from rupturing the membrane layer.

Installation Constraints & Calibration

• Valve Selection: The hardware mounts directly onto a standard 1.5-inch or 2-inch tank gate valve via standard threaded flange adapters. To ensure uniform gas diffusion, avoid mounting the device on dead-end pipe extensions or areas with zero internal oil circulation.
• Field Calibration Constraints: The 201Ti does not require routine calibration gases in the field. The internal software runs automated self-tests and continuous baseline tracking. The onboard non-volatile memory logs internal data variables and status flags for up to one full year.

Communication and SCADA Mapping

• Network Integration: While the 4 to 20 mA analog output provides generic gas tracking, configuring the embedded RS-485 Modbus loop allows SCADA systems to extract precise ppm metrics alongside rate-of-change (ROC) trends.
• Ground Loops: In high-voltage substation switchyards, run RS-485 lines using shielded, twisted-pair cabling. Ground the shield at the remote RTU or gateway panel only to prevent massive ground loops from distorting the digital communication signals.

System Integration & Compatibility Checklist

• Software Utility: Parameterization, alarm point entry, and historical data extraction are executed locally or remotely via GE’s Hydran Host or Perception software platforms.
• Alarm Framework: Supports custom configuration of dual independent alarm thresholds (Hi and Hi-Hi ppm steps) alongside distinct rate-of-change trend warnings.
• Mechanical Adapters: Available with custom brass or stainless steel flange adapters to fit varying regional transformer valve dimensions.

Frequently Asked Questions

Can the Hydran 201Ti isolate exactly how much Acetylene gas is present?

No. The 201Ti is a composite gas monitor. It outputs a total combined value in parts-per-million (ppm) based on the combined electrochemical activity of all present fault gases. If the transmitter registers a sudden spike or passes an active alarm threshold, plant engineers must pull a physical oil sample for laboratory Dissolved Gas Analysis (DGA) or deploy a multi-gas monitor (like a Kelman variant) to identify the specific root fault condition.

What should be done if the local display states “Membrane Fail”?

This indicates a loss of vacuum balance or detected oil breakthrough on the internal sensing layer, representing an internal diagnostic fault. De-isolate the mounting valve immediately to prevent insulating oil from seeping into the main electronic housing, and replace the membrane assembly according to factory procedures.

Can this unit be mounted directly underneath high-vibration cooling pump lines?

While the 201Ti is physically robust and has no internal moving parts, continuous high-frequency vibration from older oil pumps can accelerate mechanical fatigue on the mounting threads and cause micro-fissures in the internal electronic connections. If a high-vibration area is unavoidable, utilize flexible isolation dampening kits or opt for a remote-mounted version.