16
58-603 Pulsar
®
Model R86 Radar Transmitter
2.4.1.3 Obstructions
Almost any object that falls within the beam pattern will
cause reflections that may be misinterpreted as a false liquid
level. Although PULSAR Model R86 has a powerful Echo
Rejection routine, all possible precautions should be taken
to minimize false target reflections with proper installation
and orientation. Refer to section 2.4.2.3 for additional
information.
2.4.1.4 Nozzles
Improper installation in a nozzle can create “ringing” that
will adversely affect measurement. The antenna should
always be mounted so the active section of the antenna is a
minimum of 0.5" (12mm) outside the nozzle. Antenna
extensions are offered to allow the PULSAR Model R86
transmitter to work reliably in nozzles up to 72" (1.8
meter). See Section 3.7.6 for dimensional drawings of all
antenna designs including nozzle extensions.
Be sure to include any nozzle distance extending within
the vessel.
2.4.1.5 Standpipes and Stillwells
The PULSAR Model R86 can be mounted in a standpipe
or stillwell but certain items must be considered:
• Metal stillwells only: Sizes 1
1
⁄
2
–4 inches (38–100 mm).
• Diameter must be consistent throughout length; no reducers
or gaps.
• Stillwell length must cover complete range of
measurement (i.e., liquid must be in stillwell).
• Welds should be smooth.
• Vents: holes <0.125" (3 mm) diameter,
slots <0.125" (3 mm) width.
• If an isolation valve is used, it must be a full port
ball valve with an I.D. equal to the pipe diameter.
• Configuration must include a non-zero entry for
PIPE I.D parameter.
2.4.2 Installing the Transmitter
• Remove the protective plastic cap from the top of antenna.
Store the cap in a safe place in case the transmitter has to be
removed later.
• Carefully place the transmitter on the antenna.
• Rotate the transmitter to face the most convenient direction
for wiring, configuration and viewing.
• Do not place insulating material around any part of the
radar transmitter including the antenna flange.
0.50" (13 mm)
Minimum
2" (50 mm)
" L " Dimension (Nozzle Height)
PULSAR Model R86 Mounted in
Stillwell (Bridle)
