EASZ-1 Series - Transmitter for Measurement of Moisture Content in Oil

The EESIFLO Transmitter Series EASZ-1 is specially designed for the measurement of water content in oil. The EASZ-1 is ideal for online monitoring of moisture or total water in lubrication or hydraulic oil, which is very important for the long-term performance and adaptive maintenance of plant and machinery.

For instance, water affects dramatically the performance of bearings and seals and therefore continuous monitoring is extremely important.

Measurement in oil using the Capacitance Method

The analyzer uses the capacitance principle. A cylindrical sensor and outer barrel are fixed in size and distance from each other and form the electrodes of a coaxial capacitor. The oil sample flows between the "plates" as a dielectric fluid, changing the capacitance of the assembly proportionally with the change in dielectric constant of the fluid. The measured capacitance is converted to a water content output signal by the microprocessor and associated components.

Although the capacitance approach to the measurement of water in oil is sound in principle, previous methods have had limited success. This is caused by the difficulty of measuring the small capacitance change of a large standing value and implementing accurate compensation for the effect of temperature changes on the dielectric constant. Indeed, some instruments do not even make the effort. In any measurement system, accuracy depends on the number and stability of the components involved in the signal chain. Analog circuits used in other instruments (even those that incorporate digital displays) have , of necessity, many components that add errors at each stage of the signaling processing with the consequent inferior performance.

In contrast, the EASZ-1s analyzer design reduces the primary dependency to a single component whose characteristics are known and well controlled. This, and the application of sophisticated algorithms, using a microprocessor, allows the analyzers to deliver stability and accuracy unmatched by others. A further benefit of these instruments is that they can be used to accurately determine variables necessary for their own calibration.

Temperature compensation is provided by a built in temperature sensor . The temperature input shifts the calibration curve in the microprocessor, proportionally with a change in temperature. This shift is assumed to be linear with small temperature changes and small water percentages. long term stability and resistance to pollution of the EESIFLO capacitive sensor element.

Installation

The sensing probe is designed for inline monitoring and can be placed directly in the oil line at pressures up to 16 bar or more. The Capacitance probe was designed to use lower energy and is loop powered and only needs two wires.

Easy Calibration and Adjustment of EASZ-1

The user can easily readjust or calibrate the transmitter by using either a simple procedure with a push button on the printed circuit board or the configuration software.

FEATURES/BENEFITS

• Continuous measurement of moisture content in oil
• Continuous measurement of free water content in oil
• Temperature Compensation
• Excellent long term stability and drift free
• Fast response to changes
• Easy to install
• No maintenance needed
• Loop Powered (2 wire) or 24 vdc (other options available)
• Analog and RS 232 full duplex Output as standard
• User re-configurable range 0-1000ppm, 0-1%,0-3%,0-10% and 0-25%
• Lightweight and Robust
• Encapsulated Electronics
• Factory Calibration or onsite calibration
• RS-485 option allows up to 30 units to be connected in series
• Optional HART protocol on request
• Fully CE Compliant