U.S. Solid USS-DBS91 User manual

Instruction Manual
USS-DBS91 Bench Scale

Table of Contents
Introduction..........................................................................................1
1.1 Safety Precautions.........................................................................................1
Design and Function.............................................................................................. 3
2.1 Components....................................................................................................3
2.2 Keyboard......................................................................................................... 4
2.3 Display Panel..................................................................................................5
Unpacking.................................................................................................................. 6
Before Using............................................................................................................. 7
4.1 Leveling the scale.......................................................................................... 7
4.2 Calibration....................................................................................................... 9
Operation..................................................................................................................10
5.1 Basic Weighing.............................................................................................10
5.2 Unit Switching...............................................................................................11
5.3 Counting........................................................................................................ 11
Setting........................................................................................................................13
6.1 Baud Rate..................................................................................................... 13
Maintenance............................................................................................................ 14
7.1 Precautions................................................................................................... 14
7.2 Cleaning........................................................................................................ 15
7.3 Disposal.........................................................................................................15
Troubleshooting..................................................................................................... 16
Technical Data........................................................................................................17

1
Introduction
Thank you for choosing the U.S. Solid USS-DBS91 Series Bench Scale.
The USS-DBS91 Bench Scale is precise and reliable. It offers a high level
of operating convenience and response sensitivity to facilitate
determination of the weight of your samples. U.S. Solid’s dedicated
customer service staff are available to answer any inquiries regarding
applications and accessories.
Please read the manual completely and follow the usage instructions
before installation and operation as this will help you to make full use of
the functions and performance of the USS-DBS91 Bench Scale.
1.1 Safety Precautions
The U.S. Solid USS-DBS91 Bench Scale qualifies as state-of-the-art
technology and complies with all recognized safety rules. Improper use
or handling, however, can result in damage and/or injury. Please follow
the precautions below to ensure safe and trouble-free operation of your
scale.
•The scale has a 3-pin power socket equipped with a
ground terminal. To prevent electric shock and to maintain

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stability in operation of the scale, be sure to ground the scale.
•Avoid getting the scale wet as it is not water resistant. Any leakage of
liquid into the scale may damage the scale or cause an electric shock to
the user.
•Use a power source (voltage, frequency, outlet type)
adapted to the specification of the scale. If excessive voltage
is used, the scale may overheat and be damaged or cause a fire.
•Operate the scale on a stable, rigid and flat table.
•Handle the scale carefully. It is a precision device,
subjecting it to impact may result in a malfunction.
•If the device is not be used for a long period of time, the power
should be turned off and disconnect the power cable.
•Do not disassemble, remodel or repair this product or accessories.
•Do not weigh items larger than the scale's range, as this may damage
the load cell of the scale.

3
Design and Function
2.1 Components
1: Weighing Pan 4: RS232 Interface 7: Power Inlet
2: Display Panel 5: Leveling Indicator 8: Power Switch
3: Keyboard 6: Leveling Feet

4
2.2 Keyboard
Key
Description
Enter the counting function
Select the option in the setting of baud rate
Tare or zero the scale
Perform the baud rate set while powering on
Switch the option in counting mode
Switch the weighing unit
Perform weight calibration

5
2.3 Display Panel
No.
Description
1
“+”: Indicates positive values
“-”: Indicates negative values
“○”: Stabilization indicator (Disappearance indicates
stabilization of scale)
2
Weight value
3
Weight unit
4
Remaining capacity of the battery

6
Unpacking
The USS-DBS91 Bench Scale is a precision instrument. Unpack the scale
carefully and check the delivered items for completeness.
The following accessories are part of the standard equipment for your
new USS-DBS91 Bench Scale:
·1 Scale Main Body
·1 Weighing Pan (rectangular)
·1 Power Cable
·1 Instruction Manual
·1 Quality Certification
Check the instrument for damage in transit. Immediately inform the
U.S. Solid customer service if you have any complaints or parts are
missing.

7
Before Using
·Adjust the leveling feet of the bench scale until the air bubble in the
indicator is centered.
·Warm up for 30 minutes after starting up to improve the stability of
weighing.
4.1 Leveling the scale
Accurate horizontal positioning is necessary for repeatable
measurements and exact results. To compensate for small irregularities
or tilts at this location, the instrument needs to be leveled.
Adjust the leveling feet of the bench scale until the air bubble in the
indicator is centered. The level indicator is located under the cover
towards the rear of the bench scale.

8
Position of air bubble
Adjustment method
up
Turn both feet clockwise
down
Turn both feet counterclockwise
Left
Turn left foot counterclockwise, right foot
clockwise
Right
Turn left foot clockwise, right foot
counterclockwise

9
4.2 Calibration
Calibration is an important step to assure the bench scale will accurately
weigh the sample.
Perform calibration operations in the following situations:
•Changes in the location of use (including moving in the same room).
•Changes in ambient conditions.
1. Press “TARE”to zero the scale in the weighing state;
2. Long press the “CAL”button and “--CAL--”will be displayed;
3. After that “20000”(or “10000”) will be flashing displayed, then place
the calibration weight on the pan ;
4. “------”will be displayed, then “20000”(or “10000”) will be displayed
again;
5. Remove the calibration weight and “------”will again displayed.
6. The calibration is completed and it will return to the weighing
interface.

10
Operation
5.1 Basic Weighing
1. Press “TARE”to zero the scale in the no-load state.
2. Place the weighing sample on the weighing pan.
3. After the display stabilizes, read the value displayed.
Weighing a sample that needs to be in a container:
1. Place the weighing container on the weighing pan.
2. Wait for the display to stabilize. Then press “TARE”to tare, and the
displayed value will return to zero.
3. Place the sample(s) to be weighed in the weighing container.
4. After the display stabilizes, read the value displayed.
* Overweight Alarm
When “------”is displayed in the weighing state, it indicates that the
sample weight exceeds the maximum range of the scale. The sample
should be removed immediately to avoid damage to the scale.

11
5.2 Unit Switching
The USS-DBS91 Bench Scale offers four weight units of “g”,“ct” “oz”and
“lb”. The unit selection function can be used to meet the unit
requirements in various usage situations.
In the weighing state, press the "UNIT" button to switch weight units.
5.3 Counting
The U.S. Solid USS-DBS91 Bench Scale offers a counting function that
meets various industrial counting requirements, especially the counting
function for small components.
To ensure the accuracy of the counting function for small components, it
is necessary to ensure that the weight of all samples is consistent, and
that the weight of a single object is ≥4g.
1. Press “COU”and “--COU--”will be displayed;
2. After that “10 PCS”will be flashing displayed;
3. Press “TARE”to select the quantity and put the corresponding
quantity of samples on the pan;
4. Press “COU”to confirm and “------PCS”will be displayed;

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5. Put samples to be counted after the “------PCS”again displayed and
the corresponding number appears.
Exit counting function:
1. Press “COU”and “------”will be displayed;
2. Then it will exit the counting function and return to the weighing
interface.

13
Setting
6.1 Baud Rate
The baud rate could be set to change the transmission speed of the
interface.
1. Press “TARE”while powering on, and the baud rate options will be
displayed cyclically.
2. When looping to the required baud rate, press “COU”to confirm the
selection.
3. Then the baud rate set successfully.

14
Maintenance
7.1 Precautions
The U.S. Solid USS-DBS91 Bench Scale is a precision mechatronics
intelligent measuring instrument, which must be carefully maintained
and treated.
1. Do not use sharp objects (such as pens) to click the button, use only
your fingers.
2. To avoid damage to the weighing system, do not let the object fall
from the height onto the weighing pan.
3. Do not expose the scale to high humidity or dusty conditions for an
extended period of time.
4. When the scale is not to be used for a long time, cover it with to
prevent dust from entering.
5. When weighing powder and fine particles should be done with a
suitable container to prevent dust and particles from falling into the load
cell below the weighing pan.
6. Keep the scale clean and dry.

15
7.2 Cleaning
•Turn off the power switch and remove power cord during
maintenance.
•Make sure that no dust or liquid enters the scale housing.
•Do not use any aggressive cleaning agents (solvents, abrasive
cleaning agents, etc.) or organic solvents to clean the scale.
Clean the scale using a piece of lint-free cloth which has been wet with
a mild detergent (soap) only.
7.3 Disposal
Disposal of equipment and packaging must be carried out by the
operator in accordance with relevant laws of the country or region in
which the equipment is to be used.

16
Troubleshooting
Problem: Display remains off after switching on.
Possible causes:
•Power cord is not connected
•Power line fuse blown
•Power transformer damaged
•Instrument faulty
Problem: Weight display is constantly changing or unstable.
Possible causes:
•Test bench vibration
•Electromagnetic field interference
•Power supply instability
Problem: Displayed value and actual weight are not consistent.
Possible causes:
•Not returned to zero before weighing
•Scale not leveled well

17
Technical Data
Model
USS-DBS91-
16
USS-DBS91-
21
USS-DBS91-
31
Capacity
16 kg
21 kg
31 kg
Readability
1g
Repeatability
±2 g
Linearity Deviation
±3 g
Stabilization Time
Within 3 seconds
Pan Size
12 × 9 inches (315 × 230 mm)
Interface
RS232
Power
110V 60Hz AC
Dimensions
15.8 × 15.0 × 6.3 inches
Net Weight
7.72 lbs
Shipping Weight
8.82 lbs

Contact
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You can email us at [email protected]
You can call one of our friendly customer service representative at
[phone]