Bently Nevada 3300/47 Differental Expansion Monitor

Many large machines requiring differential expansion monitoring lack a convenient location for mounting the large proximity probes needed for this critical measurement, and extremely large machines may even demand a monitoring range exceeding the linear range of a single proximity probe tracking a collar; the 3300/47 Complementary Input Differential Expansion Monitor addresses these needs with an alternate measurement technique, enabling expanded monitoring ranges from standard transducers and proving highly useful for extra-large range requirements—achieved by using two proximity probes in a complementary setup to observe a rotor collar, where the probes are installed such that when the collar moves beyond one probe’s linear range, it enters the other’s, allowing 3300/47 to deliver a range up to double that of a single transducer—while the LCD of 3300/47 displays both the magnitude and direction of differential expansion, and 3300/47 is equipped with four alarm setpoints (two over and two under alarms).