Dwyer ULL - Manual (Page 4)

Chapter 2: Installing the Unit
Precautions
• Ensure that the unit is mounted in an area that meets the stated temperature,
pressure and technical specifications.
• Ensure that high-voltage sources or cables are at least 40˝ (1 m) away from the
sensor and its cable.
• Use round cables with minimum diameter of 0.24 to 0.28˝ (6 to 7 mm) to ensure
that the unit remains sealed per IP65 standards.
• Ensure that cables are routed correctly and tightened along walls or pipes.
• Installation and operation of this product should be performed according to the
Product Installation and Operating Instructions. Otherwise the use of this product
is prohibited.
When installing the unit ensure that it is:
• Mounted above the dead-zone area.
NOTE: If the device enters the blocking distance (dead- zone
or blind zone), it will not measure correctly.
• Positioned at least 1.64 ft (0.5 m) away from the tank walls.
Add 4˝ (10 cm) spacing for each 40˝ (1 m) in range.
• Perpendicular to the surface of the target.
NOTE: Even the slightest difference in angle may affect echo
quality.
• Placed as far as possible from noisy areas, such as a filling
inlet.
NOTE: When installed in a humid environment it is
recommended to position the sensor on a tripod on top of the
vessel.
Installing the Unit on Threaded Flange/Thread-Free Flange
The unit is available in 2˝ NPT or 2˝ BSP (upon request).
The unit can be installed with threaded-flange mounting or with thread-free flange
mounting, as shown below:
Figure 2: Threaded Flange/Thread-Free Flange Mounting
NOTE: When installing a thread-free flange mounted unit, you will need a 2˝
(50.8 mm) locking nut to secure the unit inside the tank.
To Install the Unit:
1. Insert the threaded end of the unit into the opening at the top of the tank or pipe.
2. Bolt the unit into place in one of the following ways:
• Threaded-flange mounting: Screw the unit into a flange with a threaded
2˝ (50.8 mm) hole.
• Thread-free mounting: Place the unit in the flange, and bolt it from within
the tank with a 2˝ (50.8 mm) locking nut.
NOTE: Tighten the locking nut hand tight only. When tightening the nut, hold the
lower part of the unit, and make sure that the seal is leak proof.
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