capacitive point level detection - omega engineering · the lvcn series are capacitance switches...
TRANSCRIPT
®
LVCN6000/7000 SeriesCapacitive Point Level Detection
®
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Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Models & Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Relay Status Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Warranty & Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Contents
03
04
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Introduction
The LVCN Series are capacitance switches ideal for High/Low level detection forliquid, solids, granular materials and pastes. These units can also detect levelwithout being in contact with the product through a sight glass. Unlike othercapacitance probes, the LVCN6000/7000 can detect conductive, non-conductive orlow dielectric materials with extremely accurate performance without requiring anexternal reference or installation in a metal vessel.
The sensor operates in a manner that is similar to a simple capacitor. A highfrequency oscillator is located within the tip of the probe. When the tip of the probecomes in contact with the medium, the frequency of the oscillation reaches a presetpoint and the detection circuit signals the switch to change state.
Technology
Both models can be made with cable or rod rigid stainless steel giving more flexibilityto complex applications.
Features
No Moving Parts – Rugged Construction
Highly customizable:
POM (Polyoxymethylene), PTFE or PVC Sensing Tip
Available in DC or Universal Power Supply versions
Almost completely immune from build-up, coating media aggressive products
Easily applied in a wide range of applications/industries such as: water, oils,corrosives, solids, powders, grains, conductive as well as non-conductive medias.
Extended Lengths with both Rigid 316 rod or Cable
Threaded, Flange or Sanitary Process Connections
LVCN6000/7000Capacitive Point
Level Detection
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Threaded Connections
3/4”
1 ½”
1”
2”
Housing Options
Mounting Options for LVCN6000/7000
Process Connections
120m
m
1,75
NPT
15mm
BSP
70m
m
PTFE or PVC Standard
3/4” or 1” NPT
20mm
1 ½”
2 ½”
2”
3”
Tri-Clamp Connection
80m
m
Models and Dimensions
20mm
1 ½” NPT
Extended Length
TC Connection
Rubber Seal
Process Connection
L50
mm 20mm
1 ½”
2 ½”
Flange Connections
2”
1”
Cable Extension
FF
RF
90m
m
50m
m
ANSI 300#
05
ANSI 150#
20mm
13
0m
m130mm 118mm
76
mm
89mm 80mm
Nylon Aluminum
50m
m 20mm
120m
m
Minimum SizesPTFE or PVC Tip
POM Standard
06
®
1 2 3 4 5 6
NO24Vdc
ON
C NC
Relay Contact5A-250Vac
L2
L1
L3
P1P2
Power Supply24Vdc
L1 - Power ON (Green)
L2 - Output Status (Red
L3 - Sensor Status (Delay) Yellow
P1 - Sensibility Adjustment
P2 - Time Delay Adjustment
H
L
1
8
+ -
2
9
3 4 5 6 7
5
01
2
34 6
7
8
9
10
Sensitivity
10
120 sec.
LVCN6000
NO
24Vdc
NC
Delay
Time Delay Adjustment
Sensitivity Adjustment
LVCN6000 Aluminum Housing
LVCN7000 Nylon Housing
Power Supply
L1 L2L3
P2P1
12 -3 - Ground4 -5 -6 -
- Power SupplyPower Supply
7 -
8 - Positive DC9 - Negative DC
CommonNO ContactCommonNC Contact
12 - Negative DC3 - Ground4 -5 -6 -
- Positive DC
NO ContactCommonNC Contact
Wiring Diagram
80....260Vac
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Relay Status Guide
Switch Position
Probe covered
Probe covered
Probe uncovered
Maximumfail-safe
Minimumfail-safe
Probe uncovered
Level NO - NC Red LEDYellow LEDGreen LED
H
L
ON ONON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
6
6
6
6
7
7
7
7
4
4
4
4
5
5
5
5
Probe covered
Probe uncovered
Level SPDT Red LEDYellow LEDGreen LED
64 5
64 5
ON ONON
ON OFF OFF
LVCN6000
LVCN7000
08
®
Verify that the location the probe is to be mountedis clear from the stream of product (Fig. 1).
When installing more than one probe in yourprocess, verify that they are separated by aminimum distance of 500mm (Fig. 1).
Material falling onto the probe can cause damageor switching errors. If this is unavoidable, it isrecommended that a protective shield be installedabove the probe to protect it. The shield is alsorecommended when the probe is use for a lowlevel switch or in the outflow of the product (Fig. 2).
The tip of the probe should slightly pointdownward ( when possible) so that if there are anyexcess of product it will easily slide from the probe(Fig. 2).
When installing from the top of the tank confirmthat the tip of the probe has cleared the side of thevessel at least 500mm (Fig. 3).
When installing the sensor directly to the tankmake sure that the rod extends beyond the innerwall of the tank, by as much as possible, so thatinternal build up or other debris does not interferewith the sensor's performance (Fig. 2 correct Fig.4 incorrect).
Installation
Installation
500m
m
500m
m
500mm
Fig. 1
Fig. 3
Fig. 4
ShieldFig. 2
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Installation
For probes with cable extensions, installationshould be from the top of the tank. It is alsorecommended that for these probes the processshouldn't have any agitation as this can causefluctuating readings or damage to the probe(Fig. 5).
The LVCN with rigid rod is recommended forapplications that have turbulence or vorticesthroughout use (Fig.6).
Ensure that the conduit is facing downward toavoid water from entering the housing (Fig. 7).
Verify that the probe has been wired as per theinstructions on page 7.
The probe must be installed utilizing the type ofconnection provided.
The Capacitance Probes Series will not workproperly in viscous, coating mediums with highsalt content (high di-electric), especially whenmounting from the side of the vessel. Sitron doesnot recommend using this product in this type ofapplication unless otherwise specified.
Caution:
Before installing the probe, ensure that theavailable power supply is correct.
Verify that the operating pressure andtemperature of the process corresponds to theoperating parameters of the probe.
Fig. 5
Fig. 7
Fig. 6
10
®
Calibration
1. Turn both potentiometers (P1 and P2) fullycounterclockwise before you begin (Fig. 1).
2. Install the probe and power it on. The L1 greenLED should be on.
3. With the vessel empty (or the medium not incontact with the sensor), turn the sensibilitypotentiometer (P1) clockwise until the yellowLED (L3) turns On. Mark that location on theelectronics' label using a pencil. If this LED (L3)does not turn on, mark the maximum position onthe label with a pencil (Fig. 2).
4. Fill the vessel until the medium is in contactwith the sensor.
5. Turn the potentiometer (P1) counter-clockwiseuntil the yellow LED (L1) turns Off. Mark thelocation where the yellow LED shuts off on theelectronics' sticker using a pen or pencil. If theLED does not turn Off, leave the potentiometercompletely turned counter-clockwise (Fig. 3).
6. Now that you have marked minimum andmaximum settings for your particular application,turn the sensibility potentiometer (P1) clockwisehalf way between the two pencil marks. This pointshould be the ideal setting where the probe isneither too sensitive or not sensitive enough.This method of calibration should also preventfalse alarms.
5
5
5
5
0
0
0
0
1
1
1
1
2
2
2
2
3
3
3
3
4
4
4
4
6
6
6
6
7
7
7
7
8
8
8
8
9
9
9
9
10
10
10
10
Sensitivity
Sensitivity
Sensitivity
Sensitivity
10
10
10
10
1
1
1
1
20 sec.
20 sec.
20 sec.
20 sec.
LVCN
LVCN
LVCN
LVCN
Delay
Delay
Delay
Delay
L1
L1
L1
L1
L2
L2
L2
L2
L3
L3
L3
L3
P2
P2
P2
P2
P1
P1
P1
P1
Fig.1
Fig.2
Fig.3
Fig.4
DelayAdjust the delay time from 0,1 to 20 seconds
by setting potentiometer P2.
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Handling
When cleaning the rod use a soft brush or anyother similar object.
Probes:
Periodic visual inspection of the probe is requiredto check for corrosion or deposit build-up. Ifdeposits are found, clean the sensor to ensureoptimum performance.
The probe should not be dropped or suffer anyimpact or fall that could damage the electronics orthe plastic tip of the probe (Fig. 4 and 5).
Seal the thread with Teflon tape beforeinstallation (Fig. 1).
Do not turn or handle by the housing whentightening the process connection. However, thehousing is suitable to be reoriented by once theprocess connection has been tighten.(Fig. 2).
Use the correct tool during installation (Fig. 3)
Fig. 5
Fig. 4
Fig. 3
Fig. 2
Fig. 1
12
®
Technical Specifications
LVCN7000
2VA
5MHz
Level switch for liquids solids and granular
Cable gland - ½”NPT cond. entry or M12 connector
POM (Polyoxymethylene), PTFE or PVC
24 Vdc +/- 10%
Relay (SPDT) 5A max (250Vac)
Potentiometer - Switch Point
Potentiometer 1 to 20 seconds
Led status on/off
3/4” to 1 1/2” BSP or NPT flange or sanitary connections
Glass filled nylon
145 PSI (10 Bar)
14 to 176º F (-10 to 80ºC)
IP 65
Current Consumption
Frequency oscilation
Enclosure Material
Process Connection
Operating Temperature
Electrical Connection
Application
Operating Voltage
Output
Adjustment
Time Delay
Level indication
Wetted Material
Class Protection
Max pressure
1 2 3 4 5 6
NO24Vdc
ON
C NC
SC700
L2
L1
L3
P1P2
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Technical Specifications
LVCN6000
4VA
5MHz
Level switch for liquids solids and granular
Cable gland - ½”NPT cond. entry or M12 connector
POM (Polyoxymethylene), PTFE or PVC
85...230 Vac
24 Vdc
Relay (NO + NC) 5A max (250Vac)
Potentiometer - Switch Point
Potentiometer 1 to 20 seconds
Led status on/off
3/4” to 1 1/2” BSP or NPT flange or sanitary connections
Glass filled nylon, Aluminium
145 PSI (10 Bar)
14 to 176º F (-10 to 80ºC)
IP 65
Current Consumption
Frequency oscilation
Enclosure Material
Process Connection
Operating Temperature
Electrical Connection
Application
Operating Voltage
Output
Adjustment
Time Delay
Level indication
Wetted Material
Class Protection
Max pressure
H
L
1
8
+ -
2
9
3 4 5 6 7
5
01
2
34 6
7
8
9
10
Sensitivity
10
120 sec.
SC 700
NO
24 Vdc
NC
Delay
L1 L2L3
P2P1
14
®
Fault Cause Solution
Trouble Shooting
Doesn’tPower Up
Doesn’tDetect Medium Low sensibility Adjust sensibility trimpot
Always On Build up on the sensor Clean sensor thenadjust sensibility
Green LED OffNo power Verify current supply
Bad contact Verify cable connection