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New
the tuning-fork sensor has many advantages compared with the load
cell or the electromagnetic system.
On
the other hand, it is also a fact that the load cell and the electromagnetic
system have been utilized as the major mechanism of electronic scales
or/and precision balances for a long time, however the tuning-fork
sensor, which is a completely different system from others, smashes
the existing conception of electronic scales and balances thanks to
such advantages mentioned above.
For example, very low power consumption is needed to drive the tuning-fork
vibrator, and the tuning-fork balance needs no warming up time, although
a load cell and an electromagnetic system needs 10 to 60 minutes for
this. We are certain that it is very handy and ground breaking. |
School Balances |
- 16.5mm LCD display. User
friendly operation
- Mono-metal tuning-fork sensor
(MMTS)
- 1/62.000 displayed resolution
- Selectable modes, weighing
units, percentages weighing and parts counting. HI, LO
& OK checkweighing
- 20 step bar graph display.
Dust cover
| Model |
Capacity |
Division |
Stamped div |
Plate [mm] |
| SJ-220CE |
220g |
0.01g |
0.01g |
140 dia |
| SJ-620CE |
620g |
0.01g |
0.1g |
140 dia |
| SJ-2200CE |
2200g |
0.1g |
0.1g |
180 x 160 |
| SJ-6200CE |
6200g |
0.1g |
1g |
180 x 160 |
|
Production Area |
- Mono-metal tuning-fork sensor
(MMTS)
- 1/620,000 displayed resolution
- Selectable modes, weighing
units, percentage weighing & parts counting. HI, LO,
OK checkweighing
- 20 step bar graphy display
- Windshield standard on 1mg
division models
| Model |
Capacity |
Division |
Stamped div |
Plate [mm] |
| AJ-220CE |
220g |
0.001g |
0.01g |
118
dia |
| AJ-H-220CE |
220g |
0.001g |
0.01g |
118
dia |
| AJ-620CE |
620g |
0.001g |
0.01g |
118
dia |
| AJ-H-620CD |
620g |
0.001g |
0.01g |
118
dia |
| AJ-H-2200CE |
2200g |
0.01g |
0.1g |
180
x 160 |
| AJ-2200CE |
2200g |
0.01g |
0.1g |
180
x 160 |
| AJ-H-4200CE |
4200g |
0.01g |
0.1g |
180
x 160 |
| AJ-4200CE |
4200g |
0.01g |
0.1g |
180
x 160 |
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Quality Control |
- Mono-metal tuning-fork sensor
(MMTS)
- 1/620,000 displayes resolution.
Aluminium die cast housing
- 18mm bright green fluorescent
display
- Direction keys for easy function
setting
- Counting, accumulation, percentage
weighing
- HI, LO, OK checkweighing
with selectable audible alarm
- Parts counting.
- Bar graph display. Sleep
mode. Dust cover
- Under-bench weighing. Windshield
standard on 1mg division models
| Model |
Capacity |
Division |
Stamped div |
| HJ-220CE |
220g |
0.001g |
0.01g |
| HJ-620CE |
620g |
0.001g |
0.1g |
| HJ-2200CE |
2200g |
0.01g |
0.1g |
| HJ-4200CD |
4200g |
0.01g |
0.1g |
| HJ-15KCE |
15kg |
0.1g |
1g |
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| This
is proved by the fact that the trouble rate is very low compared to
other systems, also the signal processing is extremely fast due to the
digital signal from a vibrator. Needless to say, the speed of stability
and display of the measurement data is higher than other systems. |
Production Area |
- All stainless steel housing
with IP65 rating
- Maximum 1/330,000 resolution
- Newly developed right angle
transmission tuning-fork sensor
- 18mm fluorescent green
display
- Indicator can be mounted
on base, remotely or on column
- Multiple weighing units.
HI, LO, OK checkweighing
- Parts counting and precentage
weighing bar graph display
- Simple calibration. Dust
cover.
| Model |
Capacity |
Division |
Stamped div |
Plate [mm] |
| HJ-17KSCE |
17kg |
0.1g |
1g |
400 x 350 |
| HJ-33KSCE |
33kg |
0.1g |
1g |
400 x 350 |
| HJ-62KDSCE |
6.2/62kg |
0.1/1g |
1g |
400 x 350 |
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The three major force measuring systems currently
used in various measuring instruments are: load cell, electromagnetic
system and tuning-fork sensor. The reason why a tuning-fork sensor
is preferred is its excellent performance, including reliability
and stability, as explained below in comparison with the other two
systems.
| Tuning-fork
balance |
Electromagnetic
balance |
Load cell scale |
| A
tuning-fork vibrator is monolithically formed in the shape
of a pair of common tuning-forks joined at each of the tines.
When the vibrator made of metal is strained or loaded, the
frequency increases/decreases according to the loaded weight,
which is counted and output digitally. As a tuning-fork
is standardized for a use in a musical instrument or a clock,
the frequency is extremely stable and accurate. The stability
of a tuning-fork sensor is unrivaled and an A/D converter
is unnecessary. Incidentally, the stress distortion of the
tuning-fork sensor is 1/10 of the load cell and the output
sensitivity is 50 times better than that of a load cell
based balance of similar price / performance |
This keeps
the balance against loaded weight by the electromagnetic
force from a magnet and a coil, measuring the electromagnetic
flow to the coil. This type of balance also needs an A/D
converter as well as a load cell. It is highly suited for
high-resolution balances, although it needs much care with
regard to temperature and magnetic force changes. |
This measures
distortion of metal and a strain gauge affixed to the metal
according to the loaded weight, and then displays the weight.
This type of scale needs an A/D converter due to its analog
output. The structure is simple and inexpensive. However,
the accuracy is lower than the other two types, and especially
in terms of high resolution, the tuning-fork sensor demonstrates
its superiority to the load cell, as detailed later. |
Below
is a summary of a tuning-fork sensor's characteristics:
| Repeatability |
Excellent as the system
does not require any distortion of metal |
| Linearity |
Although the original signal is
non-linear, it is stable and can be linearized in a computer.
It greatly minimizes non-linearity |
| Temperature
characteristics |
Very
good, as the greater part of the mechanism is a durable
elastic material |
| Generation
of heat |
Minute due to the low power consumption
of the sensor and circuit board, and the sensor needs no
warming up time |
| Long-term
stability |
Superior, as the tolerance factor
is little as mentioned above |
| Structure |
Small and compact |
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