Dwyer ULSS - Manual (Page 20)

20 of 30 MN890570 Rev A
INSTALLATION Step Nine
The Series ULS should always be mounted perpendicular to the liquid surface and installed using the provided
FKM mounting gasket. Make sure that the fitting and transmitter threads are not damaged or worn. Always
hand‐tighten the transmitter within the fitting. Perform an installed leak test under normal process conditions
prior to system start up. Note: The preferred mounting fitting for the Series ULSS & ULSM is the ULS‐ACC‐121
(2” thread x 1” thread) reducer bushing.
Mounting Guide
1. Do not mount at an angle
2. Liquid should never enter the dead band
3. Side Wall:
a. Mount at least 2” from the side wall
b. For Series ULSL ‐ mount at least 3” from the side wall
4. Do not mount where obstacles will intrude on sensor’s beam width
a. See Specifications, Step Two
5. Do not mount in a vacuum
6. Avoid mounting in the center of a dome top tank.
7. In cone bottom tank, position the sensor over the deepest part of the tank.
Do not install at
angle relative to the
liquid.
Do not install within
2” of tank sidewall.
(3” for Series ULSL)
Do not install with
objects in the beam.
Do not install in
applications with
vacuum.
Installation in existing fittings: If the existing fitting is larger than the threads of the Series ULS, select a
reducer bushing such as the ULS‐ACC‐121 (2” thread x 1” thread) or ULS‐ACC‐131 (3” thread x 2” thread).
Metal Tanks (Series ULSS & ULSM): Dwyer Instruments, Inc ultrasonic transmitters have been optimized for
use in non‐metallic fittings.
1. For best performance, avoid the use of metallic fittings.
a. Use a plastic 2” x 1” reducer bushing, such as the ULS‐ACC‐121 or a plastic 1” flange, such as the
ULS‐ACC‐312 for metallic tanks.
2. While installations directly into a 1” metal fitting are not recommended, acceptable results may be
obtained if the 1” fitting is a half coupling in form and the outer diameter of the coupling is tightly
wrapped in vinyl tape to dampen vibrations.