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Omega LVP-51-R, Руководство пользователя

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Omega LVP-51-R Скачать руководство пользователя страница 10

10

 

WIRING

  

Step

 

Six

 

Wiring

 

to

 

a

 

OMEGA

 

ENGINEERING

 

Controller

 

LVCN

‐

120

 

Series

 

Controller

 

(4

 

or

 

20

 

mA

 

output)

:

 

LVCN

‐

120

 

Shown

 

 

Switching

 

Inductive

 

Loads:

   

The

 

use

 

of

 

suppressors

 

(snubbers)

 

is

 

strongly

 

recommended

 

when

 

switching

 

inductive

 

loads

 

to

 

prevent

 

disrupting

 

the

 

microprocessor’s

 

operation.

 

The

 

suppressors

 

also

 

prolong

 

the

 

life

 

of

 

the

 

relay

 

contacts.

 

Suppression

 

can

 

be

 

obtained

 

with

 

a

 

catch

 

diode

 

for

 

DC

 

circuits

 

and

 

a

 

resistor

‐

capacitor

 

(RC)

 

for

 

AC

 

circuits.

   

 

Catch

 

Diode

 

Always

 

use

 

stepper

 

relays

 

between

 

the

 

sensor

 

and

 

external

 

loads.

  

For

 

DC

 

circuits

 

use

 

a

 

catch

 

diode

 

such

 

as

 

1N4148,

 

shown

 

on

 

left.

 

 

Refer

 

to

 

the

 

following

 

circuits

 

for

 

RC

 

network

 

assembly

 

and

 

installation:

  

 

Choose

 

R

 

and

 

C

 

as

 

follows:

 

R:

 

0.5

 

to

 

1

 

Ohms

 

for

 

each

 

volt

 

across

 

the

 

contacts

 

 

C:

 

0.5

 

to

 

1

 μ

F

 

for

 

each

 

amp

 

through

 

closed

 

contacts

 

Notes:

 

1.

 

Use

 

capacitors

 

rated

 

for

 

250

 

VAC.

 

2.

 

RC

 

networks

 

may

 

affect

 

load

 

release

 

time

 

of

 

solenoid

 

loads.

 

Check

 

to

 

confirm

 

proper

 

operation.

 

3.

 

Install

 

the

 

RC

 

network

 

at

 

the

 

meters

 

relay

 

screw

 

terminals.

 

An

 

RC

 

network

 

may

 

also

 

be

 

installed

 

across

 

the

 

load.

 

Experiment

 

for

 

best

 

results.

 

 

 

 

Содержание LVP-51-R

Страница 1: ...1 ...

Страница 2: ...2 ...

Страница 3: ...pment The sensor s operation and point of actuation may vary based on the dielectric properties of various application liquids tank materials and thicknesses The LVP 51 R sensor is intended to be used with liquids with a dielectric value between 20 and 80 Due to its user calibration capability it may be able to detect liquids below a dielectric constant of 20 under certain conditions but this must...

Страница 4: ... type 1 SPST relay Contact rating 60 VA 1A maximum Contact output Selectable NO NC Process temp F 40 to 176 C 40 to 80 Enclosure rating NEMA 4X IP65 Enclosure mat PSO Conduit entrance Single 1 2 NPT Bracket material LVP 92 PP LVP 91 PE Bracket mounting 3M adhesive plastic thermal weld Cable jacket mat PP Cable type 4 conductor 22 AWG shielded Cable length Standard 10 3m Classification General purp...

Страница 5: ...t The LVP 51 R sensor may be mounted in the PE LVP 91 or PP LVP 92 bracket Make sure that the fitting is compatible with the tank it will be applied to Material Compatibility The sensor itself is not designed to be immersed It should be mounted in such a way that it does not normally come into contact with fluid Its case is made out of Polysulfone PSO Refer to an industry reference such as the Com...

Страница 6: ...on Dielectric Constants NOTE Liquids with a conductivity value 100 µS cm are fine if coating is not an issue Liquids with a dielectric constant less than 20 will not be detected by an LVP 51 R level switch depending on conditions Acetone 21 Acetoaldehyde 22 2 Acetyl methyl hexyl ketone 28 Alcohol 16 to 31 Ammonia 15 to 25 Acetic acid 4 1 to 6 2 Butyl chloride 9 6 Barium chloride 9 to 11 Benzene 2 ...

Страница 7: ...a seal between the sensor and the tank wall and will hold it in place during testing and installation If desired the sensor may be installed temporarily without welding the fitting to the wall If several different locations must be tried before permanent installation use double sided foam stick tape designed for PP or PE 4 After the sensor has been tested to verify the POA weld glass or strap the ...

Страница 8: ...oval and or maintenance of the sensor The cable length may be extended up to a maximum of 1000 feet using a well insulated 14 to 20 gauge shielded four conductor cable Wire Stripping Using a 10 gauge wire stripper carefully remove the outer layer of insulation from the last 1 1 4 of the sensor s cable Unwrap and discard the exposed foil shield from around the signal wires leaving the drain wire at...

Страница 9: ...60 VDC All models LVP 51 R uses the relay and features 4 wires red black white and green and a shield wire The NO NC status is set by the polarity o f the voltage feeding the red and black wires The green wire is the common for the relay and the white wire is the NO or NC depending on the polarity of red and black Normally Open Wiring Normally Closed Wiring ...

Страница 10: ... RC for AC circuits Catch Diode Always use stepper relays between the sensor and external loads For DC circuits use a catch diode such as 1N4148 shown on left Refer to the following circuits for RC network assembly and installation Choose R and C as follows R 0 5 to 1 Ohms for each volt across the contacts C 0 5 to 1 μF for each amp through closed contacts Notes 1 Use capacitors rated for 250 VAC ...

Страница 11: ...either the Green or White wires Complete the circuit by connecting the Green to VDC power or White to VDC power see illustration below Sensor Power RED BLK wires 36 VDC Max 5 1mA Dry 20 1mA Wet Relay Rating GRN WHT wires 60 VA Switching a Normally Open AC Load The Red wire connects to Positive of the DC power supply and the Black wire connects to Negative The LOAD can be attached to the Green wire...

Страница 12: ...ile the White wire is connected to the LOAD Jumper the LOAD to the Negative to complete the circuit Sensor Power RED BLK wires 36 VDC Max 5 1mA Dry 20 1mA Wet Relay Rating GRN WHT wires 60 VA Normally Open DC Load as a N Channel Output The Red wire connects to Positive of the power supply and the Black wire connects to Negative The White wire is jumped to the Black wire while the Green wire is con...

Страница 13: ...he sensor Insert a small screwdriver into the small slot at the edge of the cap and gently pry upwards 2 Looking down you will see a small three position switch and two trim pots marked Full and Empty You may start with whatever state the tank is in 3 Full state With the tank filled to the top of the sensor set the switch to the Full position right Make sure your hands or any other objects are not...

Страница 14: ...corrections if possible If the full and empty states are too similar dielectrically it may not be possible to use a capacitance sensor Testing the Sensor 1 Power Apply power to sensor by connecting power to the controller and or power supply 2 Full condition Fill the tank with the application liquid by filling the tank up to the sensor s point of actuation 3 Test With the sensor being fluctuated b...

Страница 15: ...15 ...

Страница 16: ...16 ...

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