Dwyer ULL - Manual (Page 3)

Chapter 1: Introduction
The unit is available in three separate series: The ULB for solids, the ULL for
liquids, and the ULF for open channel flow liquids.
Depending on the series, the unit can be used for the following measurement tasks:
• Dust-free tanks with solids (ULB)
• Open channel flow (ULF)
• Liquid tanks with calm surfaces (ULL)
The ULF and ULL have a range of up to 49.21 ft (15 m) with an accuracy of 0.25%
of the maximum measuring range (version dependent).
The ULB has a range of up to 28 ft (8.5 m) with an accuracy of 0.25% of the
maximum measuring range (version dependent).
SPECIFICATIONS
Service: ULB: Bulk solids, ULF/ULL: Compatible liquids.
Wetted Materials: Sensor: Polypropylene or PVDF (upon request), Acoustic
Window: ECTFE.
Ranges: (see “Measuring Ranges”).
Accuracy: 0.25% of max range (at 20°C).
Resolution: 0.04˝ (1 mm).
Blind Zone: (See “Blind Zone”).
Beam Angle: 5° @ 3db point.
Temperature Limits: -40 to 158°F (-40 to 70°C).
Temperature Compensation: Automatic.
Pressure Limits: 13.5 psi (0.9 bar) to 30 psi (2 bar).
Power Requirement: 18 to 28 VDC.
Output Signal: 4 to 20 mA.
Max. Loop Resistance: 727 Ω at 28 VDC.
Electrical Connection: Screw terminal.
Conduit Connection: 1/2˝ NPT conduit or cable gland (optional).
Process Connection: 2˝ NPT or 2˝ BSP (optional).
Enclosure Material: ABS and UV resistant.
Enclosure Rating: NEMA 4 (IP65).
Mounting Orientation: Vertical.
Memory: Non-volatile.
Display: 4 character LCD.
Units: ft, m (upon request).
Programming: 4 button.
Weight: 3.1 lb (1.4 kg).
Measuring Ranges
Blind Zone (Measured from the tip of the sensor)
Page 2
ULB for solids
ULF for open-
channel flow
ULL for liquids
Standard
Extended
Range
Short
Range
Standard
Short
Range
Standard
0.82 to 11.5 ft
0.25 to 3.5 m
1.96 to 28 ft
0.6 to 8.5 m
0.82 to 16.4 ft
0.25 to 5 m
1.96 to 49.2 ft
0.6 to 15 m
0.82 to 16.4 ft
0.25 to 5 m
1.96 to 49.2 ft
0.6 to 15 m
Figure 1 : Front and Side View
ULB-11
ULL-1XXX
ULF-X1-XXX
ULB-12
ULL-2XXX
ULF-X2-XXX
0.8 ft (0.25 m)
1.96 ft (0.6 m)