IST AG’s new Moisture-in-Oil Sensor – ideal for the continuous monitoring of water content in industrial oils.

Oil is the lifeblood of many industrial plants and machines. It is used for cooling, lubrication, insulation, and power transmission. To operate a gearbox, a transformer or an industrial plant safely and stable over a long period of time, it is often necessary to monitor the condition of the lubricants with the support of sensor technology.

Moisture-in-Oil Sensor

For such monitoring functions, IST AG has developed the new Moisture-in-Oil sensor. This is a compact, digital humidity and temperature module (RH/T) which measures the relative degree of saturation of water in %RH (water activity aw in %) in oils and fuels. This measurement method has a significant advantage compared to the measurement of absolute water content (in ppm H2O), because it always reflects the current condition and performance of the oil.

Every lubricant ages, this happens through degradation, additive degradation and impurities. As a result of aging, the oil's ability to absorb water changes in the long term and the lubricant's performance decreases, which, in the worst case, can lead to machine downtime and expensive repairs. In terms of preventive maintenance, continuous monitoring of the oil's current water absorption capacity becomes more and more important.

To ensure safe plant operation, such monitoring is used in those industrial areas where maintenance and machine downtimes are scheduled. Examples of moisture-sensitive systems can be found in ship engines and their gearboxes, in commercial vehicles, in the transformers of trains, and in power engineering in wind turbines and their generators. In industry, moisture monitoring can be used for large-volume oil reservoirs in large drilling and paper machines, and in smaller systems such as mobile oil filtration units.

With its robust and compact screw-in stainless steel housing, the new Moisture-in-Oil sensor is ideal for use in an industrial environment. Via a universal, digital electronic interface (I2C), the sensor can be easily integrated into various measuring and monitoring systems. The sensor is delivered temperature compensated and calibrated and a test board with analog (0-10V) outputs is also available for evaluation purposes. Customer orientation is a major focus at IST AG, hence IST AG offers application-specific assembly and calibration solutions to manufacturers of measuring instruments for this sensor.

Key specifications

Continuous monitoring of temperature and degree of saturation of water in oil.

Operating ranges: 0 to 100 % RH; -40 to 120 °C

Reproducibility: ±0.2 %RH; ±0.1 °C

Accuracy: ±3% RH; ±0.2°C

Housing: 1.4571 stainless steel, M14x1.5mm thread, and

Interface: digital I2C; 0.5 m cable.

Moisture in oil probe

HYT271 MK33 assembly is a fully calibrated, ready-to-use RH/T module in screw-in probe. Housed in robust and compact screw-in stainless steel housing with a metric M14 thread, HYT271 MK33 is ideal for test measurements in an industrial environment. Sustains -40°C to +120°C and 0 to 100%RH (water activity aw). Digital I2C interface over 0.5m cable. Compatible with HYT Test board (USB or 0 to 10V analog outputs).

Product name: HPM.HYT.271.M.0.SK.SA.S

Operating humidity range: 0 % RH to 100 % RH

Operating temperature range: -40 °C to +120 °C

Accuracy humidity: ± 3 % RH at + 23 °C

Accuracy temperature: ±0.2 °C

Digital interface: I²C, default address 0x28

Operating voltage: 2.7 V to 5.5 V

Current consumption: < 1µA in sleep mode, < 22µA at 1Hz measuring rate

Dimensions: 67 x 18 mm L xØ

Connection type: 4xAWG26 cable

Wire dimensions: 500 mm

Product code: 155958

Innovative Sensor Technology (IST AG) is one of the world’s leading manufacturers of physical, chemical and biological sensors. Founded in 1991, the company is headquartered in Ebnat-Kappel, Switzerland, and employs about 500 people worldwide.

IST is a company of the Endress+Hauser Group, headquartered in Reinach, Switzerland. Endress+Hauser is among the global leaders in measuring instruments, services and solutions for industrial process engineering.

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