DMS-001 — wireless hydrogen sensor for oil-filled equipment (LTE / LoRaWAN)
DMS-001 (Hydrogen Wireless Sensor) is a kit with a wireless hydrogen sensor for the oil or gas space of transformers and other oil-filled equipment. Data is transmitted over LTE Cat M1, NB-IoT or LoRaWAN 1.0.2, measuring range 25–5000 ppm. Hydrogen values are compared with load and temperature in the web interface.
- Versions
- DMS-001-O — in oil; DMS-001-H — in gas space
- Measuring range
- 25–5000 ppm
- Accuracy (in oil)
- 20% of reading or 25 ppm (larger value)
- Communication
- LTE Cat M1 / Cat NB1 (NB-IoT) or LoRaWAN 1.0.2
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Hydrogen is the main gas generated in most thermal defects, from overheating of insulation to partial discharges and breakdown. It is regarded as an indicator of emerging problems and a reason for additional laboratory testing of oil. Once the sensor is connected to the valve and power is applied, hydrogen values appear on the screen immediately. The DMS-001-O version measures hydrogen in oil (mineral oil, other types on request), and the DMS-001-H version measures in the gas space.
The kit is supplied with the hydrogen sensor already connected to the wireless interface. The sensor has a ¾″-14 NPT thread for mounting on a drain or fill valve of the transformer, and other connection options are agreed with the manufacturer. The wireless interface is fixed with bolts or magnets and, owing to its low consumption, is powered from a wide range of DC or AC voltages. Power 120–370 V DC or 80–260 V AC, 24 V DC on request, consumption 15 W.
Data transmission uses energy-efficient global LPWAN networks: LTE Cat M1 or NB-IoT cellular communication, or LoRaWAN 1.0.2 at choice. This speeds up installation and reduces communication infrastructure costs. Data is collected automatically at a central point, the system sends alerts, e-mails and periodic reports, and hydrogen trends are visible in the web interface on a computer or mobile device. Hydrogen concentration, sensor temperature and device temperature are measured. The sensor is part of the ConnectGrid platform, with remote control and firmware updates of the device fleet and integration with analytics and SCADA systems.
Measuring range 25–5000 ppm, error in oil 20% of reading or 25 ppm, repeatability 10% or 15 ppm, cross-sensitivity less than 1% in oil and less than 2% in gas. Operating temperature from −40 to 70 °C, oil temperature up to 105 °C. The sensor is rated IP68 with immersion up to 7.6 m, and the wireless interface is IP66 (NEMA-4). The default measurement period is 1 minute and the transmission period is 5 minutes, both configurable.
Technical specifications
| Versions | DMS-001-O — in oil; DMS-001-H — in gas space |
|---|---|
| Measuring range | 25–5000 ppm |
| Accuracy (in oil) | 20% of reading or 25 ppm (larger value) |
| Communication | LTE Cat M1 / Cat NB1 (NB-IoT) or LoRaWAN 1.0.2 |
| Power supply | 120–370 V DC / 80–260 V AC (24 V DC on request) |
| Consumption | 15 W |
| Protection rating | sensor IP68 (immersion up to 7.6 m); interface IP66 / NEMA-4 |
| Measurement / transmission period | default 1 min / 5 min |
| Sensor thread | ¾″-14 NPT |
| Operating temperature | from −40 to 70 °C |
Request a price and lead time
DMS-001 — wireless hydrogen sensor for oil-filled equipment (LTE / LoRaWAN). We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
Over which communication channel does the data travel?
Over LTE Cat M1 or NB-IoT cellular, or over LoRaWAN 1.0.2. The default measurement period is 1 minute and the transmission period is 5 minutes, both configurable.
What power does the wireless interface need?
120–370 V DC or 80–260 V AC, with 24 V DC available on request. Consumption is 15 W.
How is the sensor attached to the transformer and what is its protection rating?
By a ¾″-14 NPT thread to the drain or fill valve. The sensor is rated IP68 with immersion up to 7.6 m, and the wireless interface is IP66 (NEMA-4).
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