Download Level Tuning Fork Sensors

®
LTU2000 Series and
Tuning Fork Sensors
®
®
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Models and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
LTUP and LTUR Status Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
LTUM Status Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
03
Introduction
LTU-2000 Series:
Point Level Switch
Omega's LTU-2000 Series use a piezo-electric crystal that enables the switch to vibrate
at a fixed pre-defined resonant frequency. When the tuning fork is submerged in the
medium the frequency at which the switch is vibrating, changes. This change is detected
by the unit’s electronics and is converted into a switch output (either relay or PNP/NPN
depending on the model).
The red LED in the housing stays blinking when the LTU-2000 is in contact with the
product. The same light stays on continuously when there is no contact with the product,
giving a positive indication at all times that the LTU-2000 is working.
All models are made with 316 Stainless Steel and are available with ECTFE or epoxy
coatings and hygienic fittings for sanitary applications. Standard versions can operate at
temperatures up to 80ºC (176ºF) and higher temperature versions can operate at
temperatures up to 120ºC (248ºF). All models (except the mini-versions) have adjustable
time delay adjustment of 1, 5, 10 or 20 seconds and also have a Wet/Dry selection for
both High and Low level application requirements.
Features
Unaffected by variations in density, conductivity, dielectric constant or viscosity
Unaffected by foam, tank agitation or vibration
Available in Threaded, Sanitary and Flanged connections
Available with customized length options to best suit your application
All 316SS body and wetted parts, ECTFE coating when necessary
Adjustable response time (from 1 to 20 seconds)
Relay and Transistor outputs available
04
®
Models
LTUM1-DC
LTUP-DC
NYLON HOUSING
®
LTUM2-AC
®
LTUM1-DC
LTUR
NYLON HOUSING
LTUM2-AC
LTUR
ALUMINUM HOUSING
LTUR
ALUMINUM HOUSING
05
Models and Dimensions
Mounting Options for LTU-2000
Nylon
LTUM
Aluminum
89mm
80mm
76mm
126mm
89mm
ø38mm
118mm
130mm
28mm
48mm
56mm
Aluminum
130mm
Extended Necks for High Temperature
MT
50mm
100mm
HT
Extended necks for medium temperature (up to 100ºC) and high temperature (up to 120ºC)
Insertion Length
TC Standard
LTUM
Extended Length
L
80mm
TC Standard
LTU
64mm
80mm
Standard
Process Connections
Threaded Connections
3/4”
BSP
NPT
1”
1 ½”
2”
1 ½”
2 ½”
2”
3”
1,75
Tri-Clamp Connection
TC Connection
Rubber Seal
Process Connection
Flange Connections
1”
1 ½”
FF
2”
RF
ANSI 150#
ANSI 300#
2 ½”
06
®
Wiring Diagram
LTUP - Housing
Time Delay Guide
Time Delay
1 - Power Supply (+)
2 - Power Supply (-)
3 - PNP/NPN Output
or +24v/0v (Max 500mA)
4 - Ground
Central LED
Wet/Dry
1 5 10 20
ON
ONONONON
1 2
1 2 1 2 12 12
Power Supply
WET
DRY
Mode
3
4
WET
DRY
O
+
1
_2
UT
LTUP - with M12 Connector
1 - Power Supply (+)
2 - Power Supply (-)
3 - PNP/NPN Output
or +24v/0v (Max 500mA)
4 - Ground
20 … 60 V dc
( IL ) 500 mA Máx
LTUR - Universal Power Supply
Nylon Housing
Time Delay Guide
Central LED
1 - Power Supply (L) } AC ( )
2 - Power Supply (-)
} DC ( )
3 - Power Supply (+)
4 - NC Contact
5 - Common
6- NO Contact
Time Delay
Power Supply
1
5
10
Relay Contact
5A - 220Vac
20
ON
1 2
1
2
LTUR - with M12 Connector
4
3
L - +
WET
DRY
5
6
NC C NO
1&2 (85... 264Vac (50/60Hz))
2&3 (18...36Vdc)
1 - Power Supply (L) or (+)
2 - Power Supply (-)
3 - NO Contact
4 - NC Contact
5 - Common
Power Supply
AC: 85... 264Vac (50/60Hz)
(I) < 10mA
DC: 18...36Vdc
(I) < 6mA
Time Delay Guide
5
ON
1
ON
1
2
1
2
10
ON
1
2
20
ON
1
The different key positions indicate the time
delay in seconds.
2
( 1 ; 5 ; 10 ; 20 sec. )
07
Wiring Diagram
LTUR - Universal Power Supply
Small Aluminum Housing
1 - Power Supply (L)
} AC ( )
2 - Power Supply (-)
3 - Power Supply (+) } DC ( )
4 - NC Contact
5 - Common
6 - NO Contact
Central LED
®
2 3
1
5 6
4
Wet
Dry
L - +
LTUR - with
M12 connector
1 & 2 (85...260 Vac)
2 & 3 (18...36 Vdc)
1 - Power Supply (L) or (+)
2 - Power Supply (-)
3 - NO Contact
4 - NC Contact
5 - Common
LTUR
S
E
C
ON
1 2
5
1
20
10
Time Delay
Guide
Time Delay
LTUR - Universal Power Supply
Large Aluminum Housing
Time Delay
Output Logic Inversion
1 - Power Supply (L) } AC ( )
2 - Power Supply ( -)
} DC ( )
3 - Power Supply (+)
4 - NO Contact
5 - NO Common
6 - NC Contact
7 - NC Common
®
LTUR
ON
A
B
S1
1 2
D
E
L
A
Y
S
E
C
1
5
Supply:
AC: 85...260V
DC: 18...24V
1
2
10
20
Wet
Dry
3
L
- +
AC DC
4
5
NO
6
7
Time Delay
Guide
NC
Central LED
08
®
Wiring Diagram
!
To avoid burning the unit, make sure that the load has been
installed in series with the LTUM before powering it up.
LTUM1
DIN 43650
M12
3
2
2
3
1
4
3
0V
2
1
LTUM
1
NO
+V
LTUM
2
1
4
NC
0V Out
+V Out
3
5
®
®
LTUM2
DIN 43650
M12
3
2
2
3
1
4
NC
L1 N
2
1
4
NO
3
5
1
L1
3
N
2
1
09
®
LTUP and LTUR Status Guide
For LTUP / DC
Switch Position
Out
Level
Central LED
WET
(Blink)
WET
Probe Covered
Maximum
fail-safe
DRY
(On)
Probe Uncovered
WET
(Blink)
DRY
Probe Covered
Minimum
fail-safe
DRY
(On)
Probe Uncovered
For LTUR (Universal Power Supply)
Level
NO - NC
4
Central LED
5
WET
(Blink)
Probe Covered
5
6
4
5
DRY
(On)
Probe Uncovered
5
6
10
LTUM Status Guide
LTUM1 / DC ( Operating Mode NC )
Connector Pins
3
2
1
4
external
load
(+) (-)
LTUM1 / DC ( Operating Mode NO )
(GND)
Connector Pins
2
3
1
4
external
load
(+) (-)
LTUM2 / AC ( Operating Mode NC )
(GND)
Connector Pins
3
1
4
external
load
L1
LTUM2 / AC ( Operating Mode NO )
N (GND)
Connector Pins
2
1
4
external
load
L1
N (GND)
11
®
Installation
Confirm that the wire connections are correct
and that the available power supply is
compatible with the LTU unit.
(Fig.1)
Verify that the operating pressure and
temperature of the process corresponds to the
operating parameters of the LTU unit.
The LTU can be installed at any angle of the pipe or
vessel to detect the presence of liquids.
Verify that the forks are inserted into the medium
until the proper point within the vessel and that
they stay clear from the inside walls (Fig. 1 and 2).
Ensure that the conduit is facing downward and
makes a U-turn on the bottom of the cable to avoid
moisture from entering the housing enclosure
(Fig.3).
(Fig.2)
For proper installation of the LTU use the mark as a
reference for correctly positioning the forks. It is
recommended that the correct orientation be used
to avoid build up between the forks (Fig. 4).
Switching
hysteresis
1mm
Switching
point=1/2” (13mm)
Side View
(Fig.4)
(Fig.3)
Top View
Switching
hysteresis
1mm
Switching
point=1/2” (12mm)
12
Handling
Fig. 1
Seal the thread with Teflon tape before
installation (Fig. 1).
Do not thread the unit into the vessel, or turn it,
by the housing (Fig. 2).
Fig. 2
Use the correct tools during the installation of
the LTU (Fig. 3).
The LTU should not be dropped or suffer any
impact or fall that could damage the electronics,
coating or the forks of the probe (Fig. 4 and 5).
Periodic visual inspection of the LTU is required to
check for corrosion or deposit build-up. If deposits
are found, clean the sensor to ensure optimum
performance.
Fig. 3
Fig. 4
When cleaning the Forks use a soft brush to
ensure that the coating or polishing is not
damaged or scratched.
Fig. 5
Do not alter or bend the shape of the forks ( Fig. 6).
Fig. 6
13
®
Technical Specifications
LTUP
1 5 10 20
ON
ONONONON
1 2
12 12 12 12
WET
DRY
Mode
O
UT
+
1
_2
3
4
WET
DRY
18 … 60 V dc
( IL ) 500 mA Máx
Nylon Enclosure
Application
Operating Voltage
Current Consumption
Level Switch for Liquids
20...60 Vdc
+/- 3mA
Output
PNP (3 wires)
Medium Viscosity
Max.: 20.000cs
Accuracy
Repeatability
Time Delay
Switching Point
Load Current
Enclosure Material
Electrical Connection
Process Connection
Wetted Material
Operating Temperature
Max Pressure
Class Protection
0.1%
< 0.5mm
1 to 20 seconds (adjustable)
13mm from tip
500mA
Glass Filled Nylon
½” NPT, M12 Connector or Cable Gland
3/4” to 1 ½” BSP, NPT or Sanitary
316 Stainless Steel
-14 to 176º F (-10 to 80ºC)
725 PSI (50 Bar)
IP 65
14
®
Technical Specifications
LTUR
®
1 5 10 20
ONONONON
ON
ON
A
®
12 12 12 12
1
1 2
2 3
4
5 6
B
S1
Wet
1
2
4
3
WET
DRY
5
NO C NC
L - +
1 & 2 (85...260 Vac)
2 & 3 (18...36 Vdc)
VTK-G1
Nylon Enclosure
1
Dry
S
E
C
ON
1 2
1 2
D
E
L
A
Y
S
E
C
1
5
Supply:
AC: 85...260V
DC: 18...24V
6
1
5
10
2
3
L
- +
AC DC
20
Aluminum Enclosure
10
5
4
6
NO
Level Switch for Liquids
Operating Voltage
18...36 Vdc
85...264 Vac (50/60Hz)
Output
Medium Viscosity
Accuracy
Repeatability
Time Delay
Switching Point
Load Current Relay
7
NC
Aluminum Enclosure
Application
Current Consumption
20
Wet
Dry
DC < 6mA
AC < 10mA
Relay (SPDT) N1, G1 / (1NO+1NC) G2
Max.: 20.000cs
0.1%
< 0.5mm
1 to 20 seconds (adjustable)
13mm from tip
5A ( 250 Vac)
Enclosure Material
Glass Filled Nylon or Aluminum
Electrical Connection
½” NPT, M12 Connector or Cable Gland
Process Connection
Wetted Material
Operating Temperature
Max Pressure
Class Protection
3/4” to 1 ½” BSP, NPT or Sanitary
316 Stainless Steel
-14 to 176º F (-10 to 80ºC)
725 PSI (50 Bar)
IP 65
15
®
Technical Specifications
LTUM1
®
LTUM1-DC
LTUM1
Application
Operating Voltage
Current Consumption
Output
Medium Viscosity
Accuracy
Repeatability
Time Delay
Switching Point
Load Current
Enclosure Material
Electrical Connection
Process Connection
Wetted Material
Operating Temperature
Max Pressure
Class Protection
Level Switch forLliquids
20...60 Vdc
+/- 3mA
PNP (3 Wires)
Max.: 20.000cs
0.1%
< 0.5mm
1 sec.
13mm from tip
500mA
316 Stainless Steel
Plug DIN 43650 / M12 Connector
3/4” to 1 ½” BSP, NPT or Sanitary
316 Stainless Steel
-14 to 248º F (-10 to 120ºC)
725 PSI (50 Bar)
IP 65 DIN 43650 connector
IP 67 M12 connector
16
Technical Specifications
LTUM2
®
LTUM2-AC
LTUM2
Application
Operating Voltage
Current Consumption
Output
Medium Viscosity
Accuracy
Repeatability
Time Delay
Switching Point
Load Current
Enclosure Material
Electrical Connection
Process Connection
Wetted Material
Operating Temperature
Max Pressure
Class Protection
Level Switch for Liquids
85...264 Vac
+/- 3mA
Direct Load Switching (2 Wire)
Max.: 20.000cs
0.1%
< 0.5mm
1 sec.
13mm from tip
100mA
316 Stainless Steel
Plug DIN 43650 / M12 Connector
3/4” to 1 ½” BSP, NPT or Sanitary
316 Stainless Steel
-14 to 248º F (-10 to 120ºC)
725 PSI (50 Bar)
IP 65 DIN 43650 connector
IP 67 M12 connector
17
®
Trouble Shooting
Fault
Does not switch
Incorrect
switching
Case
The central LED is not on
Solution
Verify the Power Supply
The LED flashes 3 times/sec.
Internal failure
The LED flashes once
every 2 seconds
Internal failure
The LED flashes once
every 4 seconds
High current load or short circuit.
Check the installation.
The Fork is encrusted with
build-up
Clean the forks
Dry = on
Wet = on
Properly configure the key switch
Fast switching
Select a longer time delay
18
M-3991/0215