New Emerson technologies

Emerson Process Management has introduced a unique feature for functional testing of guided wave radar (GWR) level transmitters and continuous device status monitoring. The reference reflector function, now available in Rosemount® 5300 level transmitters, is designed for applications that require periodic verification of transmitter accuracy and overfill prevention.

With the reference reflector function, the Rosemount 5300 can be tested automatically without process interruption or raising the product level in the tank manually. This reduces the risk of overfills and shortens the time needed to check the unit. There is no longer any need to remove the device from the process or depressurise the vessel for a physical level check. This function reduces operating costs, increases fault-free operating time and improves plant safety.

In the past, checking most guided wave radars required manually raising the liquid level in the tank to the point of signal actuation, increasing the risk of overflows. This process could take up to half a day, which interfered with normal operation of the plant.

The operator had to manually monitor the level of product in the tank, which increased health and safety risks in the event of contact with the tank contents.

The reference reflector function eliminates the need for such procedures by using an adjustable reflector mounted on the probe. In the process of commissioning, the position and amplitude characteristics of the reflector are stored in the transmitter memory. During the test procedure, the recorded parameters of the reflector are compared with the actual measurements to check the electronics operation and condition of the probe head.

Standard device diagnostics monitor only the electronics, while the reflector can also be used to check the upper part of the probe inside the tank for deposits or corrosion. During the test, the guided wave radar calculates the level value in relation to the reflector position, whereby the output signal can be checked.

In test mode, confirmation of a successful test of the guided wave radar is displayed in the control room. The test function can also be accessed remotely using the Rosemount Radar Master software by Emerson.

Easy to install and configure, the reference reflector works with 5300 Series level transmitters with a flexible single-lead SS probe (4 mm), software version 2.H0 or newer. Furthermore, the reflector can be retrofitted to installed devices that meet these specifications.

Rosemount 5300 GWR level transmitters provide accurate and reliable direct level measurement. They are easy to install, and are virtually unaffected by changing process conditions. With no moving parts, they have minimum maintenance requirements. A wide selection of materials and process connections, probes and accessories makes them versatile for most applications. They are able to function effectively in the most demanding control and safety applications, including process vessels.