Powder Level Sensors
Piezoelectric type
LTS(3-terminal type self-oscillation formula) series
TSP(2-terminal type separate excitation oscillation formula) series
Issue date:
February 2012
• All specifications are subject to change without notice.
• Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific
bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.
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Powder Level Sensors
LTS, TSP Series
TDK’s piezo-type level sensor, which uses a sensor element con-
sisting of a piezoelectric ceramic, was developed originally by
TDK.
The sensor detects the presence of powder when the sensor ele-
ment, which a built-in oscillating circuit causes to vibrate, comes
into contact with powder and the vibrational conditions are altered.
The TSP series, which employs an external source of oscillation
based on a custom chip, offers even better operational stability.
FEATURES
• This is a unique sensor that employs a piezoelectric ceramic
sensor element.
• The exterior has a die cast finish which makes the sensor highly
resistant to effects caused by external vibrations and provide
stable detection characteristics.
• The sensor can detect both magnetic and non-magnetic pow-
ders.
• The sensor can be easily mounted to a wide range of locations.
• Two output types are available: ON/OFF digital output (D type)
and continuously variable analog type (A type).
• Compact size and low cost.
APPLICATIONS
• Toner detectors for copiers, laser printers, etc.
• Detectors for coffee and other powders in automatic beverage
vending machines.
• Detectors for other types of powders.
PRODUCT IDENTIFICATION
TSP 1 5 D 10 C - 01
(1) (2) (3) (4) (5) (6) (7)
(1) Types of toner sensors
LTS: 3-terminal type self-oscillation formula
TSP: 2-terminal type separate excitation oscillation formula
(2) Sensor diameter
1 : 11mm dia.
(3) Operational voltage
5 : DC.5V
(4) Output type
D : Digital
A : Analog
(5) Shape of case
(6) Output terminal type
C : Directly attached connector
None : Lead lines
(7) Identifying control number
SENSOR LEVEL EVALUATION METHOD
Position the sensor as indicated in the drawing below. The sensor
level is determined as the level at which the sensor detects powder
when powder is supplied from above.
Sensor level
Mesh
Sensor
Powder
• All specifications are subject to change without notice.
002-02 / 20120215 / eb461_ts.fm
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3-TERMINAL TYPE SELF-OSCILLATION FORMULA, LTS SERIES
PRINCIPLES OF OPERATION
A vibrator, comprising a piezoelectric element attached to a metal-
lic diaphragm, is supported by a die cast case. The vibrator is
driven by a self-oscillation circuit.
When the vibrator comes into contact with powder, the vibrator’s
oscillation is impeded, causing the vibrator to stop and hence the
powder to be detected.
Two types of outputs are available: The analog output type (direct
output of oscillation waveform) and the digital type (output of high-
low levels after passing the oscillation waveform through rectifying,
integrating, and comparator circuits).
ELECTRICAL CHARACTERISTICS
Item
Operating input voltage
Input current
Operating temperature range
Sensor level
Output voltage HIGH
Output voltage LOW
Standard
5V±0.5V
20mA max.
0 to 50°C
5mm±3mm
4.5V min.
0.5V max.
Self-oscillation
circuit
Rectifying
circuit
Integrating
circuit
Comparator
circuit
Digital
output
type
Analog
output
type
SHAPES AND DIMENSIONS
17
11±0.2 3
8.5±0.2
3.5
26±0.2
19
13
2-ø3.3
2-ø6
(16)
CIRCUIT DIAGRAMS
Digital output type
IN
4.7kΩ
Sensor
OUT
V
(2)
5V
(18)
ø11
0.5
2
2
7
11
4
GND
0.5
Analog output type
IN
Lot No.
Dimensions in mm
Sensor
OUT
Oscilloscope
GND
5V
• All specifications are subject to change without notice.
002-02 / 20120215 / eb461_ts.fm
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2-TERMINAL TYPE SEPARATE EXCITATION OSCILLATION FORMULA, TSP SERIES
PRINCIPLES OF OPERATION
A vibrator, comprising a piezoelectric element attached to a metal-
lic diaphragm, is supported by a die cast case. The vibrator is
driven by an external excitation oscillation circuit.
When the vibrator comes into contact with powder, the vibrator’s
oscillation is impeded, causing the vibrator to stop and hence the
powder to be detected.
The external excitation oscillator circuit and phase comparator cir-
cuit etc. are driven by a TDK custom chip.
These products are available in two types: The "External chip" type
in which all the circuitry is provided in a separate chip and the sen-
sor consists only of the vibrator element, and the "Internal chip"
type in which the signal processing is performed inside the sensor
to provide a binary output of high/low levels.
ELECTRICAL CHARACTERISTICS
Item
Operating input voltage
Input current
Operating temperature range
Sensor level
Output voltage HIGH
Output voltage LOW
Standard
5V±0.5V
20mA max.
0 to 50°C
5mm±3mm
4.5V min.
0.5V max.
Sweep
oscllation
Amplifier •
Rectifying
circuit
Phase
detection
Cariculation
process
Comparator
circuit
IC
inclusion
type
IC
un-inclusion
type
BUILT-IN IC TYPE
SHAPES AND DIMENSIONS
10
6
2
0.5
4
2-ø6
2-ø3.3
14
8±0.2
4 3
4
CIRCUIT DIAGRAM
IN
4.7kΩ
Sensor
OUT
V
5V
25±0.2
GND
17
7.8
2-C2
ø11
8.8
12.5
4
Lot No.
Pin No.3
Pin No.2
Pin No.1
Dimensions in mm
• All specifications are subject to change without notice.
002-02 / 20120215 / eb461_ts.fm
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IC SEPARATED TYPE
SHAPES AND DIMENSIONS
SENSOR
25±0.2
4
12.5
8±0.2 3
17
2-ø3.3
hole
ø11
4
6
2.5
Sensor
CIRCUIT DIAGRAM
IN
Sensor
control
circuit
OUT
GND
4.7kΩ
IN
OUT
V
5V
4
ø16
14
ø11
14
2
– Side
pattern
1.5
Dimensions in mm
+ Side
pattern
1
5
3
15
5
1
1
4
6
CUSTOM IC CIRCUIT
1
Sweep oscillator
IN
C
in
R
in
Sensor
TSP15A10
V
DD
8
RFA
7
FA
R
i
C
0
2
DRV
IC SEPARATED TYPE PRECAUTIONS
• Shorten the connection distance between the sensor and IC
block as much as possible. This distance must not exceed
250mm.
• Observe the polarity of the sensor block.
• Consult with TDK when using this product.
V
DD
3
MON
Phase
detection
Disposal
Reversible
6
the polarity
SL(to GND or V
DD
)
5
OUT
4
GND
C
0
: 10μF
C
in
: 1000pF
R
in
: 240kΩ
R
i
: 10Ω
RFA : 18kΩ
• All specifications are subject to change without notice.
002-02 / 20120215 / eb461_ts.fm
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