Dwyer Instruments PROXIMITY VRLS-01 Installation And Operating Instructions

MODEL VRLS | PROXIMITY
VIBRATING ROD LEVEL SWITCH
Economical, No Material Build Up, For Powder or Bulk Solids
The MODEL VRLS Vibrating Rod Level Switches is economical choice in level
detection of powders and bulk solids. The VRLS incorporates a piezoelectric crystal
that vibrates the rod at its natural frequency, when contact material is present it
dampens the vibrations and the switch changes state.
FEATURES/BENEFITS
• Probe design allows for self-cleaning, ensuring no build-up or bridging of material
and accurate detection
• No mechanical moving parts with no routine maintenance required
• Sensitivity is adjustable for detection ranging from large granular material to small
powders with low bulk densities.
• The failsafe mode can be set for failure on high level or failure on low level using a
selector switch in the enclosure
• Unaffected by the dielectric constant of the sensed material, making it superior to a
capacitance level switch for applications where the dielectric constant is too low,
where there is more than one material being used in one vessel, and when material
moisture content can change
• Ideal for applications where the bulk density is too low for a rotating paddle level
switch
APPLICATIONS
• Pulp and paper processing
• Mining
• Food and beverage
• Silos
• Hoppers
352 DWYER INSTRUMENTS, INC. | www.dwyer-inst.com
BY DWYER
®
51/64
1˝ NPT
[20.19]
10-27/32˝
[275.35]
Ø3/4
[18.87]
SPECIFICATIONS
Service: Dry powder or bulk materials
compatible with wetted materials.
Sensitivity: Min. bulk density of 20 lb/ft
(320 kg/m ).
3
Wetted Materials: 304 SS.
Temperature Limits: Ambient: -40 to
140°F (-40 to 60°C); Process: -40 to
176°F (-40 to 80°C).
Pressure Limit: 150 psi (10 bar).
Power Requirement: 20 to 250 VAC/
VDC, 50/60 Hz.
Power Consumption: 15 VA.
Enclosure: Aluminum, painted.
MODEL CHART
Model Description
VRLS-01 Vibrating rod level switch
4-29/64
[113.03]
4-9/32
[108.83]
Enclosure Rating: IP65.
Switch Type: SPDT.
Electrical Rating: 5 A @ 250 VAC.
3
Electrical Connections: Screw
terminals.
Conduit Connection: 1/2˝ female NPT
x 2.
Process Connection: 1˝ male NPT.
Indication Lights: Internal: green and
red LED.
Sensing Delay: 0 to 6 s.
Weight: 4.4 lb (2.0 kg).