Dwyer Instruments PROXIMITY VRLS-01 Manuale utente

DWYER INSTRUMENTS, INC. | www.dwyer-inst.com352

Level Switches,

Capacitive LEVEL

CAPACITANCE LEVEL SWITCH

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exibility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).

VIBRATING ROD LEVEL SWITCH

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/ft3

(320 kg/m3).

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

Model V LS Vibrating od Level Switch

Specifications - Installation and Operating Instructions

Bulletin L-V LS

DWYE INST UMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

SPECIFICATIONS

Service: Dry powder or bulk materials compatible with wetted materials.

Sensitivity: in. bulk density of 20 lb/ft3(320 kg/m3).

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 equirement: 20 to 250 VAC/VDC, 50/60 Hz.

Power Consumption: 15 VA.

Enclosure: Aluminum, painted.

Enclosure ating: IP65.

Switch Type: SPDT.

Electrical ating: 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).

The Model V LS Vibrating od Level Switch is an economical choice in level

detection of powders and bulk solids. Ideal for silo or hopper applications, its probe

design allows for self-cleaning, ensuring no build-up of material and accurate

detection. Sensitivity is adjustable for detection ranging from large granular

material to small powders with low bulk densities.

Operating Principle

The vibrating probe level switch is a system kept in resonance by piezoelectric

elements. When the vibration of the probe is damped by the surrounding medium,

the change in resonant frequency is detected by an electronic unit and converted

into a digital switching signal. Sensitivity adjustment for different detected materials

is not frequent, as there is no additional circuitry for signal amplification.

Electrical Connections

Terminal Functions

• L+, N-: Power

• NC, CO , NO: Relay Output

• Ground Connection

Panel Functions

-PWR: Power

-SIGNAL: Output Signal

-FSH (Fail Safe High): After power is connected, signal indicator lamp will turn on

and the switch will close. When probe detects material, the signal indicator lamp

will turn off and the switch will open.

-FSL (Fail Safe Low): After power is connected, the signal indicator lamp will turn

off and the switch will remain open. When probe detects material, the signal

indicator lamp will turn on and the switch will close.

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]

Electrical Connections

Terminal Functions:

• L+, N- : Power

• NC, CO , NO: Relay Output

• Ground Connection

Output Indication

1. Before wiring, please select the appropriate input power supply (L+/N-) 20-250

VAC/VDC, 50/60Hz.

When operating in either FSH mode, the output will function as follows:

A. The signal indicator lamp will light up if the level switch detects no material or the

bin is empty. The NO and CO contacts of the relay will be conducting.

B. The signal indicator lamp will turn off if the level switch detects material. The NC

and CO contacts of the relay will be conducting.

When operating in either FSL mode, the output will function as follows:

A. The signal indicator lamp will light up if the level switch detects material. The NC

and CO contacts of the relay will be conducting.

B. The signal indicator lamp will turn off if the level switch detects material. The NC

and CO contacts of the relay will be conducting.

CHECK OPE ATION-VE IFY SWITCH OPE ATION

Sensitivity Calibration

In order to adjust the sensitivity of the switch, the following procedure should be

followed:

1. If level switch has already been installed, confirm sensitivity before materials are

added.

2. By default, the output mode of the switch is set to FSH. This can be adjusted as

needed for each particular application.

3. Based on the particular application, the sensitivity can be adjusted by rotating the

SENSITIVITY knob to an appropriate selectable sensitivity setting.

Typically, the sensitivity knob is set as follows:

- SENSITIVITY L: Low Sensitivity

- SENSITIVITY H: High Sensitivity

L: Suitable for detecting a medium that has a large volume or density such as a

plastic material.

H: Suitable for detecting a medium that has a smaller volume or density such as rice

bran.

Installation

When installing VRLS, the following should be noted.

Top Mounting

-Avoid installing directly under substance inlet to prevent damage to the probe.

-Angle of mounting should be taken into consideration during installation to prevent

false alarm.

Side Mounting

-It is highly recommended to use a shield to protect the vibrating probe level switch.

The cover should be parallel to the probe and of the same length.

-Incline the device at approximately 20 degrees when installing.

Keep conduit facing downward to prevent moisture from getting inside the housing

while in operation.

-All wiring should employ 18 AWG cable.

MAINTENANCE/ EPAI

Upon final installation of the odel VRLS no routine maintenance is required. The

odel VRLS is not field serviceable and should be returned if repair is needed. Field

repair should not be attempted and may void warranty.

WA ANTY/ ETU N

Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact

customer service to receive a Return Goods Authorization number before shipping the

product back for repair. Be sure to include a brief description of the problem plus any

additional application notes.

DWYE INST UMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

Figure 3 - Failure-Mode Switch

Figure 4 - Diagram of elay Output

Figure 5 - Side Mounting Installation

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