DWYER INSTRUMENTS, INC. | www.dwyer-inst.com
352
Level Switches,
Capacitive
LEVEL
For Solids, Liquids or Slurries, Fail-Safe Protection, <1 pF Sensitivity
The
MODEL CLS1
Capacitance Level Switches provides reliable point level
measurement of solids, liquids and slurries in metallic or non-metallic tanks and
vessels. It detects the presence or absence of material in contact with the probe by
sensing a change in the capacitance.
FEATURES/BENEFITS
• Electronics provide highly sensitive measurement detection (requires less than a 1
picofarad shift from ambient)
• State of the art technology ignores material build-up on the vessel sidewall or along
the probe assembly
• One time calibration is simple with a single multi-turn potentiometer
• Red LED on housing indicates sensor status
• Adjustable 1-30 second time delay and a 5 A, SPDT fail-safe relay output
• Added installation flexibility with vertically or horizontally mounting
APPLICATIONS
• High or low level detection
• Bins
• Silos
• Tanks
• Hoppers
• Chutes
6-3/16
[157.15]
1-11/16
[42.88]
7/8
[22.23]
1-7/64
[28.18]
1/2 FEMALE
NPT CONDUIT
CONNECTION
1 MALE NPS
PROCESS
CONNECTION
1-13/16
[46.05]
3-13/16
[96.84]
21/32
[16.67]
8-5/8
[219.08]
SPECIFICATIONS
Service:
Solids, liquids, or slurries.
Wetted Material:
CPVC.
Temperature Limits:
Process: -40 to
240°F (-40 to 116°C); Ambient: -40 to
185°F (-40 to 85°C).
Enclosure Rating:
NEMA 4X (IP66),
PVC, dust tight, water resistant.
Switch Type:
SPDT.
Electrical Rating:
5 A @ 250 VAC.
Power Requirements:
120 VAC, 1.5 VA.
Conduit Connection:
3/4˝ female NPT.
Process Connection:
1˝ male NPS.
Mounting Orientation:
Vertical or
horizontal.
Sensitivity:
Adjustable to < 1 pF.
Fail-Safe:
Switch selectable, high/low.
Time Delay:
Adjustable 1 to 30 s.
Weight:
2.0 lb (0.91 kg).
Economical, No Material Build Up, For Powder or Bulk Solids
4-9/32
[108.83]
4-29/64
[113.03]
1˝ NPT
51/64
[20.19]
10-27/32˝
[275.35]
Ø3/4
[18.87]
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
SPECIFICATIONS
Service:
Dry powder or bulk materials
compatible with wetted materials.
Sensitivity:
Min. bulk density of 20 lb/ft
3
(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.
Enclosure Rating:
IP65.
Switch Type:
SPDT.
Electrical Rating:
5 A @ 250 VAC.
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).
MODEL CLS1
®
MODEL VRLS |
PROXIMITY
®
BY DWYER
MODEL CHART
Model
Description
VRLS-01
Vibrating rod level switch
MODEL CHART
Model Description
CLS1
Capacitance level switch
