46
58-610 Model R82 Radar Transmitter
3.0 Reference Information
This section presents an overview of the operation of the
Model R82 Radar Level Transmitter, information on trou-
bleshooting, common problems, listings of agency
approvals, lists of replacement and recommended spare
parts, and detailed physical, functional and performance
specifications.
3.1 Description
The Model R82 is a two-wire, 24 VDC level transmitter
based on the concept of pulse burst radar operating at
26 GHz. The electronics are mounted in a metal or plastic
housing with an innovative, internal launcher orientation
mechanism.
3.2 Theory of Operation
3.2.1 Pulse Burst Radar
The Model R82 is a top-mounted, downward-looking pulse
burst radar operating at 26 GHz. Unlike true pulse devices
that transmit a single, sharp (fast rise-time) waveform of
wide-band energy, the R82 emits short bursts of 26 GHz
energy and measures the transit time of the signal reflected
off the liquid surface. Distance is calculated utilizing the
equation Distance = C
¥
Transit time/2, then developing
the Level value by factoring in Tank Height and Sensor
Offset information. The exact reference point for distance
and level calculations is the Sensor Reference Point—bottom
of an NPT thread, top of a BSP thread or face of a flange.
Distance = c
×
(time
÷
2)
1 ns
500 ns
NPT
Process
Connection
BSP
Process
Connection
Hygienic
Pulse
Pulse Burst
Figure 29
Figure 30
Sensor Reference Point
