The Laureate Model FR is a UL-listed, 6-digit panel-mount frequency meter which can display AC line frequency to 50.0000 or 60.0000 Hz with 0.0001 Hz resolution in a few AC line cycles with quartz crystal accuracy. 1000 Hz signals may be read to 0.01 Hz at up to 25 readings/sec. The working frequency range is 0.05 Hz to 1 MHz. The unit can also serve as a fast and flexible scalable rate meter. When configured as a rate meter, the Laureate FR will display flow or rate in engineering units, such as gallons per minute or feet per second. Rate is obtained by multiplying frequency by a programmable scale factor and setting the decimal point. The Laureate FR determines frequency by timing an integral number of quartz crystal periods over a user-specified extendible gate time, and then taking the inverse of period. The inverse period approach allows greater accuracy and faster update times than conventional meters which count signal pulses over a specified time interval. Fast response is ideal for alarm and control applications. Exceptional flexibility is provided by the unit's universal dual-channel signal conditioner, which can accept AC signals from 12 mV to 250 Vac as well as signals from magnetic pickups, proximity switches with a PNP or NPN output, TTL or CMOS logic, and contact closures. Jumper selections provide optimum operation for different sensor types and noise conditions. Applications of the Laureate FR include AC power line monitoring, display of flow rate from turbine flow meters, display of RPM or speed from magnetic pickups or proximity switches, and timing applications with resolution down to 0.2 µs. A built-in isolated 5, 10, or 24 Vdc excitation supply is standard to power proximity switches and other sensors. Options include dual relays for control or alarm, isolated 4-20 mA and 0-10V analog outputs, and an RS232 or RS485 port for data communications with a host computer or PLC. Modbus RS485 is fully supported. The base price is $230. For more information and pricing of options, visit www.laurels.com/frequency.htm
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