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In utility substations, the GE 201CI-1 pairs with a Hydran 201Ti sensor mounted on transformer valves to provide real-time gas-in-oil (DGA) trending, hi/hi-hi alarms, and 4-20 mA outputs for SCADA integration, enabling predictive maintenance before gas levels reach 2000 ppm thresholds. Deploying the GE 201CI-1 with RS-485 daisy-chaining (up to 32 units over 1300 m) creates cost-effective multi-transformer monitoring networks compliant with IEEE C37.91 DGA guidelines. The GE 201CI-1 rugged NEMA 4X enclosure with internal heater ensures reliable operation from −50°C to +55°C in outdoor installations.

Model H201Ci-1 (201CI-1)

Product Type Single-channel DGA controller for Hydran 201Ti sensor

Gas Range 0-2000 ppm (H₂ equivalent total combustible gases)

Analog Output Standard: 0-1 mA non-isolated; Optional: 4-20 mA isolated (1500 Vrms, 10 V max compliance)

Alarms Hi/Hi-Hi gas alarms (pushbutton reset), fail/power loss

Communication RS-485 (daisy-chain 32 units/1300 m), RS-232 local port

Power Supply 100/115/200/230 VAC ±10%, 50/60 Hz,<120 VA

Operating Temp −50°C to +55°C (−58°F to +131°F) with heater

Enclosure IP66/NEMA 4X, 250×350×200 mm (6 kg installed weight)

Standards IEEE C37.90, IEC 255-4/801, EN 61010 (100 VAC)

Valve mounting

Install matching full-bore gate/ball valve on transformer and mount GE 201CI-1 nearby on anti-vibration brackets.

Sensor connection

Run supervisory link (3 twisted pairs AWG16/18 shielded) and power cable in conduit from GE 201CI-1 to H201Ti sensor (max 1300 m).

Power wiring

Connect AC supply to GE 201CI-1 terminals; verify heater function at low ambient temps.

Network setup

Daisy-chain RS-485 to other controllers; configure Modbus addresses via front panel.

Commissioning

Zero/span GE 201CI-1 with reference gas; test alarms and 4-20 mA loop calibration.

Mount GE 201CI-1 vertically with heater plate down for optimal convection cooling.

Use explosion-proof conduit fittings near GE 201CI-1 in hazardous transformer areas.

Separate supervisory link from power cables by 300 mm minimum for GE 201CI-1 noise immunity.

Verify oil flow direction through valve before powering GE 201CI-1 sensor.

Torque enclosure screws to 5 Nm on GE 201CI-1 for IP66 weatherproofing.

Monthly: Record GE 201CI-1 gas trends and clear Hi/Hi-Hi alarm latches after inspection.

Quarterly: Clean GE 201CI-1 enclosure vents and check heater operation at −20°C.

Annually: Calibrate GE 201CI-1 analog output with precision multimeter (4-20 mA span).

Verify GE 201CI-1 RS-485 comms with master during routine SCADA tests.

Replace desiccant cartridge in GE 201CI-1 sensor head every 2 years.

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