Hydrocal 1005 Offshore

DGA Sensor 5 Outputs for corrosive environments

Online gas-in-oil measurement sensor Hydrocal 1005 Offshore, a system with 5 outputs for measuring:

  • H2 Hydrogen
  • CO Carbon monoxide 
  • C2H2 Acetylene
  • C2H4 Ethylene
  • H2O  Moisture

Hydrocal 1005 Offshore 

The HYDROCAL 1005 Offshore is a permanently installed multi-gas-in-oil analysis system with transformer monitoring functions:

It individually measures the most relevant gases dissolved in transformer oil such as:

  • Hydrogen (H2)
  • Carbon Monoxide (CO)
  • Acetylene (C2H2)
  • Ethylene (C2H4

Furthermore, it measures moisture (H2O) present in dielectric oil.

The HYDROCAL 1005 Offshore is specially designed for the harsh conditions (saltwater, corrosion) on offshore platforms (e.g. offshore windmill parks). A special painted housing with no window and the application of chrome-nickel and stainless steel ensures the device's reliability and persistence.

The device can serve as a compact transformer monitoring system by the integration/connection of other sensors present on a transformer via its optional analog inputs:

  • 4 analog inputs 0/4 ... 20 mADC
  • 6 analog inputs 0/4 ... 20 mAAC +20% or 0 ... 80 VAC +20% (configurable by jumpers)

It is further equipped with digital outputs for the transmission of alerts or the execution of control functions (e.g. control of a cooling system of a transformer):

  • 5 digital relay outputs
  • 5 digital optocoupler outputs (option)

Key Advantages:
  • Individual measurement of Hydrogen (H2), Carbon Monoxide (CO), Acetylene (C2H2) and Ethylene (C2H4)
  • Moisture in oil (H2O) measurement
  • Special design for offshore applications:
  • Housing without window painted in C5M
  • Backplate with cable glands (chrome-nickel steel, IP 68, corrosion-free and acid-resistant)
  • Backplate, oil entrance and housing screws made of stainless steel V4A
  • Easy to mount on a transformer valve(G 1½" DIN ISO 228-1 or 1½" NPT ANSI B 1.20.1)
  • Installation on the operational transformer without any operational interruption
  • Advanced software (on the unit and via PC)
  • Maintenance-free system
  • Communication interfaces ETHERNET 10/100 Mbit/s (copper-wired / RJ 45 or fibre-optical / SC Duplex) and RS 485 to support MODBUS®RTU/ASCII, MODBUSÒTCP, DNP3 proprietary communication and IEC 61850 protocols
  • Optional 2G/3G modem with external adhesive antenna
  • Optional DNP3 serial modem for SCADA connection
  • Optional IEC 61850 modem for SCADA connection
  • Optional HV and LV bushing sensors for HV and LV bushing monitoring applications via communication interface

Transformer monitoring functions

The Hydrocal 1005 Offshore can be used as a complete monitoring system for the condition of the transformer. The main monitoring options are listed below:

Voltages and currents
  • via voltage and current transformers/transducer
Temperature Monitoring
  • Bottom and top oil temperature, ambient temperature (via additional temperature sensors)
Cooling Stage / Tap Changer Position
  • (e.g. via current transducer)
Free configuration
  • Analog inputs can be free allocated to any additional sensor
Further calculations:
  • Hot-Spot
  • Loss-of-Life
  • Ageing Rate
HV and LV Bushing monitoring functions (option)

The Bushing Monitoring system simultaneously monitors the bushing leakage current of two rows of three-phase groups of bushings. The system incorporates three different measurement modes on each tested component to provide accurate power factor and capacitance values to evaluate the condition of bushing insulation.

The measurement modes are the following:

  • Phase comparison: Compares the power factor of tested components with other tested components energized with the same phase voltage.
  • Sum of three current tests: Measures the imbalance current from the summation of A, B and C phase currents from three tested components such as the three HV or LV bushings on the transformer.
  • Adjacent phase reference test: Compares the power factor of the tested components with other phase components on the same equipment.

The bushing sensors/adapters are connected to the capacitor taps designed for all types of bushings to allow measurement of the leakage current up to 140 mA. The adapters are designed for bushings with grounded and undergrounded capacitor taps. The adapter is designed to prevent voltage from developing on the equipment, in case the sensor is disconnected from the Bushing Monitoring system.

High and low voltage monitoring

Different bushing sensor configurations are possible:

  • Monitoring of high-voltage side
  • Monitoring of high- and low-voltage side
  • Reference HV bushing from other transformers
  • Reference CCVT / CCPT

 Configuration with 3, 6, 9 or 12  bushing sensors is possible.

HydroSoft PC-Software
Program key features
  • Configuration and administration of each individual HYDROCAL unit
  • Data and configuration readout of HYDROCAL units
  • Processing and presentation of data readout (Trend or table)
  • Further processing of the processed data (Excel, CSV, clipboard and printing)
  • Storage of the processed data and unit configuration
  • Automatic data readout and alerting by e-mail

Key Features
    • 230V AC or 110V DC supply
    • Connection to valve: NPT 1” ½ or DIN-ISO 1” ½
    • Degree of protection: IP55
    • 5 digital relay outputs (220 VDC/VAC / 2 A / 60 W)
    • 5 current DC 4-20 mA
    • Communication: RJ45 RJ 45 or multimodal fiber-optic with SC Duplex (ETHERNET or MODBUS® TCP protocol)
    • Version suitable for corrosive environments painted C5M, V4A stainless steel and IP 68 chrome-nickel cable glands, corrosion-free and acid-resistant
Operation principle
  • Miniaturized gas-sample production based on headspace principle (no membrane, negative pressure proofed)
  • Patent-pending oil sampling system (EP 1 950 560 A1)
  • Near-infrared gas sensor unit for CO, C2H2 and C2H4
  • Micro-electronic gas sensor for H2
  • Thin-film capacitive moisture sensor H2O
  •  Temperature sensors (for oil and gas temperature)
Technical Data

Optional nominal voltages of auxiliary supply:

120 V -20% +15% AC 50/60 Hz
230 V -20% +15% AC 50/60 Hz
120 V -20% +15% DC
230 V -20% +15% DC

Power consumptionMax. 400 VA
HousingAluminum with painting C5M / stainless steel V4A
DimensionsW 263 x H 263 x D 327.5 mm
WeightCirca 16.5 kg
Operation temperature (ambient)-55°C ... +55°C (below -10°C display function locked)
Oil temperature (inside transformer)-20 °C ... +90 °C
Storage temperature (ambient)-20 °C ... +65 °C
Oil pressureup to 800 kPa (negative pressure allowed)
Connection to valveG 1½" DIN ISO 228-1
1½” NPT ANSI B 1.20.1
SafetyCE certified
Insulation protectionIEC 61010-1:2002
Degree of protectionIP-55
Analog outputs
TypeRangeDefault concentration (Free assignment)
1 Current DC0/4 ... 20 mA DCHydrogen H2
1 Current DC 0/4 ... 20 mA DCAcetylene C2H2
1 Current DC 0/4 ... 20 mA DCEthylene C2H4
1 Current DC 0/4 ... 20 mA DCCarbon Monoxide CO
1 Current DC0/4 ... 20 mA DCMoisture in Oil H20
Digital Outputs
TypeControl VoltageMax. Switching capacity (Free assignment)
5 Relay12 V DC220 V DC / V AC / 2A / 60 W
RS 485 (proprietary or MODBUS® RTU/ASCII protocol)

ETHERNET 10/100 Mbit/s copper-wired / RJ 45 or fibre-optical / SC Duplex (proprietary or MODBUS® TCP protocol)

2G/3G modem with external adhesive antenna (Option) (proprietary protocol
DNP3 serial modem (Option)

IEC 61850 modem for SCADA connection (Option)


Products Gallery


For any information you can contact us by phone or e-mail:
+39 0471 1800338 -

There are no articles in the shopping cart