The Series WTP Wireless Temperature Sensors can
be quickly installed on chilled water lines, air ducts or outside a
building without having to run additional wiring. By sampling the
temperature measurement every 10 seconds, the 3.6 V lithium battery is
able to power the unit for up to 8 years.
A reliable 418 MHz signal can carry the measurements up to 100 feet
without a repeater. With the optional 900 MHz repeater, measurements can
be transmitted up to 1000 feet away.