Hydrocal 1001+

DGA Sensor 2 Outputs

Online gas-in-oil measurement sensor Hydrocal 1001+, a system with 2 outputs for measuring:

  • Dissolved Key Fault Gases TDCG (H2, CO, CH4, C2H2, C2H4, C2H6)
  • H2O Moisture

Hydrocal 1001+

The HYDROCAL 1001+ is a permanently installed composite gas-in-oil sensor for the analysis of the following dissolved key fault gases (TDCG = Total Dissolved Combustible Gases):               

Fault GasTDCG Contribution
Hydrogen H2approx. 20 %
Carbon Monoxide COapprox. 30 %
Methane CH4< 5 %
Acetylene C2H2100 %
Ethylene C2H4approx. 32 %
Ethane C2H6< 5 %

To provide an even more comprehensive transformer monitoring solution, the HYDROCAL 1001+ analyses additionally the content of Moisture (H2O) in the transformer oil.

Integrating 6 relevant key gases into a total weighted gas concentration and Moisture measurement in oil enables the HYDROCAL 1001+ to react to most transformer faults. It makes the device a compact and cost-effective tool for early transformer fault detection and preventative maintenance.

The HYDROCAL 1001+ is equipped with 2 analog 0/4 ... 20 mA outputs for the dissolved composite gas-in-oil and moisture in oil analysis results and 4 digital relay outputs (Hi-alarm, Hi-Hi-alarm, Moisture-alarm and system function alarm)

Key Advantages
  • Composite measurement of Hydrogen (H2), Carbon Monoxide (CO), Methane (CH4), Acetylene (C2H2), Ethylene (C2H4), Ethane (C2H6) and dissolved Moisture (H2O) in the transformer oil
  • Relay outputs with light indicators showing potential alerts
  • Easy and fast installation without any operational interruption of the transformer
  • Compact and resistant design for long-lasting usage
  • Communication interfaces ETHERNET 10/100Mbit/s (copper-wired or fibre-optical) and RS 485 to support proprietary communication protocols and sub-station communication protocols MODBUSTCP

  • 230V AC or 110V DC supply
  • Connection to valve: NPT 1” ½ or DIN-ISO 1” ½
  • Degree of protection: IP55
  • 4 digital relay outputs (220 VDC/VAC / 2 A / 60 W)
  • 2 analog outputs 4-20mA
  • Communication: RJ45 interface or multimodal fibre-optical with SC-Duplex interface with ETHERNET or MODBUS®TCP protocol.
General Technical Characteristics

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. 200 VA
DimensionsW 224 x H 195 x D 218 mm
Weightapprox. 4 kg
Operation temperature (ambient)-55 °C ... +55 °C
Oil temperature (inside Transformer)-20 °C ... +90 °C
Storage temperature (ambient)-20 °C ... +65 °C
Oil pressureup to 800 kPa (no 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 protection

2 x Analog DC output
TypeControl RangeDefault function (Free assignment)
1 Current DC0/4 ... 20 mA DCTDCG Concentration
1 Current DC 0/4 ... 20 mA DCMoisture in oil H2O Concentration
4 x Digital Outputs
TypeControl VoltageMax. Switching Capacity
4 Relay12 V DC220 V DC/ V AC, 2A / 60 W
ETHERNET 10/100 Mbit/s con cavo in rame / RJ 45 o fibra ottica / SC Duplex
RS 485

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