Digital remote sensor delivers liquid measurement accuracy

19th September 2016
Posted By : Mick Elliott
Digital remote sensor delivers liquid measurement accuracy

Released for sale in Europe is Yokogawa Electric’s EJXC40A digital remote sensor, a newly developed DPharp EJX series differential pressure transmitter. Equipped with two pressure sensors that are connected with an electric cable, the EJXC40A measures liquid levels in large tanks and large differential pressure with high-pressure fluids.

Differential pressure/pressure transmitters are widely used in the oil, petrochemical, and chemical industries in applications such as oil and gas wells.

By measuring the difference in pressure at two points in a tank or pipe, these transmitters can calculate the level, flowrate, and density of liquids, gases, and steam.

In applications where a tank liquid or gas or a pipe fluid cannot be introduced into the pressure-receiving unit (diaphragm) of a transmitter, diaphragm-sealed differential pressure transmitters are used.

A transmitter of this type is connected to two separate pressure-receiving units by a capillary tube that is filled with silicone oil or some other fluid.

Although such transmitters are capable of precisely measuring high-pressure fluids with a high resolution, they are not suitable for use with large tanks because of limitations in the allowable length of the capillary tubes.

In addition, they are not ideal for fine differential pressure measurement because the fluids in the capillary tubes are susceptible to changes in the ambient temperature.

The EJXC40A consists of two separate pressure sensors that are connected to each other by an electric cable. Based on the difference in pressures measured by each sensor, the EJXC40A determines the liquid level, flow rate, and pressure of liquids, gases, and steam.  

Yoji Saito, head of the Product Business Centre in the Industrial Automation Platform Business Headquarters commented: “The DPharp differential pressure/pressure transmitter is a core product in Yokogawa’s field instrument line-up. Compact in size and suitable for use in a wide range of applications, over 6.5 million units of these instruments have been sold since its release in 1991. Equipped with a silicon resonant sensor that uses Yokogawa’s proprietary DPharp technology, the EJXC40A delivers the high accuracy and stability needed in the petrochemical, chemical, power, oil & gas upstream, and LNG markets that Yokogawa is targeting..”

 


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