Switch provides flow and leak detection in nuclear plants

Jan. 24, 2024

FLT93 switch provides safety-qualified flow or leak detection in nuclear plants, and its advanced, heavy-duty thermal dispersion technology is reported to be ideal for turbine water levels, pump protection, reactor core coolants, flood alarms, condensate pot levels, and interface level and temperature detection. Its            

single-sensor, multi-parameter design provides dual measuring functions, which nuclear plant operations save weight, space and costs compared to two or more discrete sensors. Dual trip points and 6A relay outputs are standard, and are assignable to flow, level or temperature.

FLT93 also features an analog design that’s fully qualified for Class 1E, safety-related nuclear power plant applications, having been extensively tested to IEEE 323 and IEEE 344 standards, as well as meeting MIL-STD-461 and EN/IEC61000 requirements. Both its insertion and in-line sensor versions are qualified for 40-year life at 150 °F. FLT93’s sensor is qualified to radiation levels of 2 x 108 rads, while its electronics are qualified to 5 x 105 rads for applications requiring an integral unit (sensor and electronics). 

FLT93 operates at a low process temperature range of -40 to 250 °F (-40 to 121 °C); high temperature range of -40 to 455 °F (-40 to 235 °C); process pressure rating of 2,000 psig; and accuracy of ±5% of reading in flow applications. 

In water, its sensing element setpoint range is up to 0.01 to 3.0 sfps (0.003 to 0.09 smps), and 3.0 watts heater power, depending on specific model configuration.  In hydrocarbon-based liquids, its sensing element setpoint range is up to 0.01 to 5.0 sfps (0.003 to 1.5 smps), and 3.0 Watts heater power, depending on the specific model configuration. In gases, the sensing element setpoint range is 0.25 to 120 sfps (0.076 to 37 smps).

Finally, FLT93’s electronic control circuit can be integrally-mounted with the sensing element, or it can be located in a remote location. Its standard enclosure is cast stainless-steel. It can be used in ATEX locations, and is rated for NEMA Type 4X (IP66/IP67) environments.

Fluid Components International