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Model-VRLS
VRLS Vibrating Rod Level Switch for Powders & Bulk Solids Detection
Models In Stock
- 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
Model-VRLS
From
$
927.95
Models In Stock
Product Overview
- Electrical Connection 1/2 in NPT female Conduit with Screw Terminal block
- Enclosure Ratings IP65
- LED Indicators Internal: Green and Red LED
- Operating Temperature, Max 140 °F
- Operating Temperature, Min -40 °F
- Power Consumption 15 VA
- Process Connection Size 1 in
- Process Connection Type NPT Male
- Process Temperature, Max 176 °F
- Process Temperature, Min -40 °F
- Proof Pressure Up to 150 psi
- Sensitivity 20 lb/ft³
- Series ID Model-VRLS
- Supply Power Note 20 to 250 Vac/Vdc, 50/60 Hz
- Supply Power Type AC/DC
- Supply Voltage 20 to 250 Vac/Vdc
- Switch Rating 5 A @ 250 Vac
- Switch Type SPDT NO/NC, Selectable
- Time Delay 0 to 6 sec
- Weight 4.4 lb
Supported Applications
The Dwyer Model VRLS Vibrating Rod Level Switch is designed for level detection of dry powders and bulk solids. The series identity centers on applications in silos or hoppers where self-cleaning probe design prevents material build-up, bridging, or coating that can interfere with accurate detection.
Documented application contexts include:
- Detection ranging from large granular materials to small powders with low bulk densities.
- Situations where bulk density is too low for a rotating paddle level switch.
- Applications involving multiple materials or changing moisture content, as the device is unaffected by the dielectric constant of the sensed material.
Operating Conditions & Performance
The VRLS series operates within specific environmental and process limits defined in the specification tables. The switch utilizes a piezoelectric crystal to vibrate the rod at its natural frequency; contact with material dampens these vibrations, triggering a state change.
- 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).
- Sensitivity Requirement: Minimum bulk density of 20 lb/ft³ (320 kg/m³).
- Sensing Delay: Configurable from 0 to 6 s.
The device features an IP65 enclosure rating and is constructed with a painted aluminum housing. Wetted materials are specified as 304 SS, compatible with dry powder or bulk materials that do not react adversely with this alloy.
Configuration Options
The series supports configurable options for output logic, sensitivity calibration, and installation geometry to accommodate specific process needs. The standard model VRLS-01 includes a 3/4" diameter probe with an insertion length of 10-27/32 [275.35].
Electrical & Output Configuration
- Power Supply: 20 to 250 VAC/VDC, 50/60 Hz (15 VA consumption).
- Switch Type: SPDT relay output with NC, COM, and NO terminals.
- Electrical Rating: 5 A @ 250 VAC.
- Failsafe Modes: Configurable via selector switch for Fail Safe High (FSH) or Fail Safe Low (FSL).
Sensitivity & Calibration
A sensitivity knob allows adjustment between selectable settings to match material characteristics:
- SENSITIVITY L: Suitable for media with large volume or density, such as plastic materials.
- SENSITIVITY H: Suitable for media with smaller volume or density, such as rice bran.
Mechanical & Installation Features
- Process Connection: 1" male NPT.
- Conduit Connections: Two (2) x 1/2" female NPT.
- Indication Lights: Internal green and red LED indicators for status monitoring.
Key Product Differences
The series is represented by the VRLS-01 model, described as a vibrating rod level switch. The device incorporates no mechanical moving parts in its sensing mechanism, requiring no routine maintenance upon final installation. Installation guidelines recommend inclining the device at approximately 20 degrees and using a shield parallel to the probe of equal length to protect against direct substance inlet impact.
Output indication logic varies by mode selection:
- FSH Mode - A: Signal indicator lamp lights if no material is detected; NO and COM contacts conduct.
- FSL Mode - B: Signal indicator lamp turns off when material is detected; NC and COM contacts conduct.
PDFs & Manuals
