RUISHAN Precision Balance

User Manual

Suitable for 0.1g and 0.01g accuracy

Contact: RuishanLab.com | ruishan.am@ruishan.com

Address: No. 5, Lane 704, Jiuting Street, Jiuting Town, Songjiang Area, Shanghai, China

Made in China

A RUISHAN precision balance with a digital display showing '-8.8.8.8.8.0'. The front panel features buttons labeled 'power', 'Zero', 'Print', 'Pcs', 'Tare', 'Unit', and 'Ca'.

Summary and Product Features

IMPORTANT!

Thank you for purchasing the RUISHAN Precision Balance. Please read the User Manual carefully before use and follow all operating and safety instructions!

PRODUCT FEATURES

HIGH PRECISION READINGS YEAR AFTER YEAR: Get more accurate results in your lab, business or at-home projects! Built with lab-quality materials and a sensitive weighing pan, the RUISHAN digital scientific scale gives consistent, accurate readings for years.

COUNTS HUNDREDS OF PIECES IN SECONDS: The analytical scale's weighing and counting functions save time and money spent accounting for chemicals, powders, herbs, jewelry, precious metals, tickets and other small items. Easy conversions between grams (g), ounces (oz), carats (ct) and pounds (lb) make the scale ideal for laboratory, educational, industrial, and agricultural projects.

ADDED ACCURACY: The analytical balance has a leveling bubble, adjustable leveling feet; an overload alarm and error indication. The precision instrument can be set up in under 5 minutes and comes with a detailed, easy-to-understand instruction manual.

EASY-TO-USE INTUITIVE CONTROLS: The precision electronic balance features an intuitive, easy-to-read LED digital display; weighing, tare and counting functions; five-second stabilization; external calibration; and a sensitive stainless steel weighing pan.

Specifications

Parameter	Details
Model	RSTP series
Pan Size	170*170 mm
Power Supply	110V
Display	LED Display
Units	g, ct, oz, lb
Stabilization time	≤5s
Working Temp	5-40 °C
Functions	Weighing/Counting/Tare/Print/Menu
Warm up Time	15 minutes
Sensor	Strain Gauge Sensor
Materials	Durable ABS body, Stainless steel weighing pan, Aluminum base
Calibration	External Calibration

Operation

Getting Started

Place the balance on a stable surface. Adjust screws on the bottom of the balance to stabilize the instrument.

Press the Power button to turn the instrument on. Allow the unit to warm-up for 15 minutes.

When the balance is turned on, it will show the maximum weighing range and accuracy. For example: "1000.01" means a capacity of 1000g and an accuracy of 0.01g.

The balance will display numbers 1 through 9. Once it displays "0", the balance is ready to calibrate.

Calibration

Turn on the scale.

Press the Tare/Cal button until the display shows CAL.

The display will show a weight (e.g., 1000g). Place the corresponding standard mass on the weighing pan. The balance has the function of automatically identifying the weight and calibrating it. Do not place weights exceeding the rated capacity.

Remove the standard mass once the display is stable and accurate.

NOTE: If this is the first time using the balance, repeat the calibration steps 2-3 times. Please make sure that the scale is placed stably during calibration or use.

Linear Calibration

Long press Tare/Cal; it will display "CAL", release the button, the display will show a weight. Long press again the button of Pcs/Unit; the scale will again display CAL, release the button, the scale will display a weight (e.g., 2000.00). Place a 2kg mass on the platform. After a few seconds, it will stable display the number "2000.00g". Remove the mass from the scale; it will display a weight again (e.g., 1000.00). Place a 1kg standard mass on the pan, follow the same step until the scale automatically returns to zero after the weight is removed.

Suitable for RSTP series products of 0.1g and 0.01g accuracy.

Note: When the product can work normally, please do not operate this step.

Tare Function

When the weight of the item to be weighed is not more than 2% of the total range, short press TARE/CAL (T<2s), and the balance will return to zero. The zero setting indicator (?) on the display will light up. The balance can still weigh at full scale.

When the weight of the item being weighed is greater than 2% of the total range, short press TARE/CAL (T<2s), and the balance will return to zero. The tare setting indicator (?) on the display will light up. The balance cannot be weighed in full capacity.

At this time, you should check the remaining weighing range on the loading progress bar. Only weigh in the remaining range.

Counting Function

Used to count number of parts by extrapolating from original sample.

Press Pcs/Unit. The balance will display 10, 20, 50, 100 in cycles.

Select from 10, 20, 50, 100.

Place the corresponding number of units on the scale. For example, if you chose 10, then place 10 units on the scale.

Press PCS key to confirm.

Add or remove pieces from the pan and the scale will display the number of pieces used. For example, add 3 and the scale will display 13.

Press Pcs/Unit again to exit counting function.

RS232 Connection

This interface is used for Printer and Computer Connection. It can be used after the default connection. If you cannot use it, please contact: ruishan.am@aliyun.com

Display and Controls

Display Indicators

The balance display includes the following indicators:

1. Battery level indicator: (Only applicable to models with built-in battery. This product does not contain batteries.) NOTE: Regardless of whether the battery is installed, it will light up when the scale is started. It will jump when there is a battery in the charging state, and it will not jump without a battery and remains in full state.
2. The balance is negative.
3. Power Indicator.
4. Level bubble.
5. The Tare setting of the balance is activated.
6. The Zero setting of the balance is activated.
7. Current display unit "gram".
8. Current display unit "carat".
9. Current display unit "ounce".
10. Current display unit "pound".
11. Range progress bar: NOTE: All progress bars are lit, indicating that the scale is full range.

Controls

ON/OFF: Switch the machine on and off.
Print/Menu: Print and function menu.
PCS/UNIT: Counting Function and Unit conversion.
TARE/CAL: Reduce gross weight to tare weight (TARE) and can be used to calibrate scale (CAL).

Maintenance

MAINTENANCE AND STORAGE

Always power off and unplug before cleaning or storing it.
Do not clean the machine with elements that may corrode the machine.
Do not immerse the machine in water or other liquids.
Use proper safety gear (e.g., gloves, eyewear, etc.) when cleaning the machine to avoid injury.

Trouble Shooting

Malfunction	Judgment Method	Solution
No boot, no work, no display	Check if the power cord is in good condition, Is there a breakpoint. Is the connection between the balance and the power cord reliable?	Replace the power cord. Ensure that both ends of the power cord are firmly connected to the device.
The balance indication is unstable, The decimal point flashes continuously	Check whether the workbench where the balance is located is vibrating or shaking. Check if there is wind around the scale. The temperature or humidity changes too much. Unstable supply voltage. There are machinery and equipment that generate strong magnetism and radiation around the balance.	Improve working condition to avoid vibration. Close doors and windows of room. Make the temperature or humidity stable. Use a voltage stabilizer to power the scale. Keep away from such machinery and equipment or use shielding devices.
"-- oL--" displayed	The balance is overloaded. No signal from sensor.	Take off the objects. Contact factory.
Scale measurement error is large	Place the standard weight on the weighing pan to compare the values.	Calibrate the scale. See page 6 for details.
Nothing happens on the scale	Tap the sensor and observe if it responds.	Contact factory.
Chip damage	N/A	Contact factory.

Safety Precautions

WARNING! Ensure everyone operating the machine reads the user manual and understands the operating instructions, cautions and dangers associated with the machine. Only trained staff should operate the machine.

IMPORTANT!! Operate the machine in a safe environment away from hazards. Do not operate in a flammable, magnetic or dangerous environment. Keep the machine away from magnetic parts (e.g., watches, pacemakers, etc.).

Before plugging the machine into an electrical outlet, make sure the voltage and frequency matches that of the machine.

Place the machine on a flat and spacious work surface.

Operate the machine in a safe, dry and well ventilated environment. The environment temperature should not exceed 5-40°C.

Always power off and unplug the machine when not in use. Store it in a safe place away from hazards.

Do not exceed the max weight to avoid damaging the sensor.

OVERLOAD WARNING

Do not overload the balance to avoid damaging the load cell.

If the display shows OL, remove weight from the scale.

If there is a calibration error, OL will be displayed. Recalibrate the balance.

Packing List and Installation

PACKING LIST

RUISHAN Precision Balance
Weighing Pan
Weigh Pan Holder (It is already fixed on the scale by default.)
Power Cord
User Manual
500g CAL. WEIGHT (0.1g accuracy products do not include CAL.WEIGHT.)
Note: This product does not contain batteries and data cable.

INSTALLATION

CHECK FOR DAMAGE: Open the package and ensure no parts were damaged during delivery. Make sure all parts shown in the packing list are included.

Place scale on a flat, stable working platform.

Assemble the balance by snapping the weighing tray into the base.

Attach power cord and plug in device. The scale accepts 110V. Please confirm the correct voltage before using the scale.

Do not overload the full capacity of the balance. If there is an error, calibrate the scale.