ℹ️ Document Conversion Notice: This document has been converted from PDF and formatted to fit this screen. Diagrams and images may be available only in the original here.

Rice Lake 350-10-4 Dual-ramp Wheelchair Scale with Seat

Software Version 11525

Operation Manual

This operation manual provides comprehensive instructions for the setup, operation, maintenance, and troubleshooting of the Rice Lake 350-10-4 Dual-ramp Wheelchair Scale with Seat. This scale is designed for safe weighing of handicapped and mobility-challenged individuals, featuring movement compensation technology for accurate weighments, a roll-on ramp, and a comfortable seat.

Revision History

This section tracks and describes the current and previous manual revisions for awareness of major updates and when the updates took place.

Revision	Date	Description
D	August 17, 2022	Established a revision history; formatted content to match other medical manuals; software version 11525
E	November 22, 2024	Revised battery replacement instructions
F	August 6, 2025	Updated specifications and indicator photos

1.0 Introduction

The 350-10-4 digital wheelchair scale with seat is a user-friendly, quality scale, designed for safe weighing of the handicapped and mobility challenged individuals. Movement compensation technology ensures sound, accurate weighments. The scale has roll-on ramp access and a comfortable seat.

The scale has a non-skid rigid platform and two rear heavy duty wheels for easy maneuverability.

The scale is set up to use motion sensing technology, to determine actual weight of a moving patient. The weight can be displayed in either pounds or kilograms and a tare weight can be entered. Section 3.0 of this manual explains scale operation and how to obtain a tare weight.

The wheelchair scale has a unique folding feature that enables easy transportation and simplifies assembly, avoiding the need for field wiring and recalibration. All that is required is to open the packaging and unfold the scale. Manuals are available from Rice Lake Weighing Systems at www.ricelake.com/manuals.

Warranty information is available at www.ricelake.com/warranties.

1.1 FCC Compliance

United States

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

Canada

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications.

Le présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la Class A prescrites dans le Règlement sur le brouillage radioélectrique édité par le ministère des Communications du Canada.

1.2 Disposal

Product Disposal

The product must be brought to appropriate separate waste collection centers at the end of its life cycle. Proper separate collection to recycle the product helps prevent possible negative effects on the environment and to health, and promotes the recycling of the materials. Users who dispose of the product illegally shall face administrative sanctions as provided by law.

Battery Disposal

Dispose of batteries at appropriate waste collection centers at the end of their life cycle in accordance with local laws and regulations. Batteries and rechargeable batteries may contain harmful substances that should not be disposed of in household waste. Batteries may contain harmful substances including but not limited to: cadmium (Cd), lithium (Li), mercury (Hg) or lead (Pb). Users who dispose of batteries illegally shall face administrative sanctions as provided by law.

WARNING: Risk of fire and explosion. Do not burn, crush, disassemble or short-circuit batteries. Do not replace battery with incorrect type.

1.3 Safety

Safety Definitions:

DANGER: Indicates an imminently hazardous situation that, if not avoided, will result in death or serious injury. Includes hazards that are exposed when guards are removed.
WARNING: Indicates a potentially hazardous situation that, if not avoided, could result in serious injury or death. Includes hazards that are exposed when guards are removed.
CAUTION: Indicates a potentially hazardous situation that, if not avoided, could result in minor or moderate injury.
IMPORTANT: Indicates information about procedures that, if not observed, could result in damage to equipment or corruption to and loss of data.

General Safety

Do not operate or work on this equipment unless this manual has been read and all instructions are understood. Failure to follow the instructions or heed the warnings could result in injury or death. Contact any Rice Lake Weighing Systems dealer for replacement manuals.

WARNING Failure to heed could result in serious injury or death.

Ensure every individual who operates or works with this unit has read and understands all safety information.
Do not transport the scale while someone is on the scale.
Do not allow minors (children) or inexperienced persons to operate this scale.
Do not use in the presence of flammable materials.
Do not use this product if any of the components are loose or cracked.
Do not use near water.
Do not use the scale on slippery surfaces, such as a wet floor.
Do not use this scale when a person's body or feet are wet, such as after taking a bath.
Do not place fingers into slots or possible pinch points.
To avoid cross contamination, the scale should be cleaned regularly.
Prior to cleaning, make sure the scale is disconnected from the power source.
People with disabilities, or who are physically frail, should always be assisted by another person when using this scale.

!IMPORTANT

Do not drop the scale or subject it to violent shocks.
Do not jump on the scale.
For accurate weighing, the scale must be placed on a flat, stable surface.
Operating at voltages and frequencies other than specified could damage the equipment.
Avoid contact with excessive moisture.
Do not make alterations or modifications to the scale.

Rice Lake Weighing Systems offers optional AC adapters; utilizing an adapter not supplied by Rice Lake Weighing Systems voids all warranties and approvals.

Weight exceeding the maximum capacity may damage the scale.

2.0 Assembly

2.1 Unpacking

Place the unopened box in an open area that has ample room for unpacking the scale. Immediately after opening the box, visually inspect the scale and components to ensure all parts are included and undamaged. If parts were damaged in shipment, notify Rice Lake Weighing Systems and the shipper immediately.

Parts contained in the shipping box include:

Scale
Manual
Box containing six AA batteries and four feet

2.1.1 Repacking

Retain the packaging for use in the event that the scale must be returned or moved. The product must be properly packed with sufficient packing materials. Whenever possible, use the original carton and packing materials when shipping the scale back.

!IMPORTANT: Damage caused by improper packaging is not covered by the warranty.

2.2 Scale Setup

Move the scale into the area where the weighing process will occur. It's recommended to place the scale on a hard, level surface for the most accurate weighments. Thin carpeting is acceptable, but not recommended.

CAUTION: Rice Lake Weighing Systems recommends using two people for lifting the scale and to use proper lifting techniques to prevent injury.

Using two people, remove the scale out of the packaging material that it came in by lifting the scale out of the box by the scale base.
IMPORTANT: Do not lift the scale out of the box by its handle as this can cause the hinges to break or affect the scale operation.
Gently set the scale base down to the floor.

2.2.1 Attach Feet to Scale

The 350-10-4 digital wheelchair scale with seat comes with four feet that must be attached to the scale base for proper operation. The four feet are located in the parts box in the original shipping box. Prior to laying the scale base on the floor, use the following steps to attach the feet to the scale.

Screw the four round feet clockwise into the scale base as shown in Figure 2-1.

[Image: Figure 2-1. Screw Feet Into the Scale Platform]

There must be adequate clearance between the scale base and the floor, so screw each foot out counterclockwise two full turns. This will ensure that there is enough clearance between the scale base and the floor.
There should be minimal clearance between the scale base and the floor without having the scale base actually touching the floor. Figure 2-2 shows the width of a finger being slid under the scale base and the floor.

!IMPORTANT: Not having clearance around the scale base creates inaccurate weighments.

[Image: Figure 2-2. Clearance Between Scale Base and Floor]

It is also important to make sure that the scale is completely level. Gently press down on all corners of the scale base to ensure there are no high spots or rocking of the scale base.
Adjust feet as needed to level the scale base.

!IMPORTANT: An unleveled base produces inaccurate weight readings.

2.2.2 Handle Setup

Loosen the handles and unfold and set upright (handles shown in Figure 2-3).
Tighten the two hinges on the wheelchair scale by rotating the two handles. This will secure the handrail mounted indicator.

[Image: Figure 2-3. Secure the Handrail by Tightening the Durable Hinges]

The wheelchair scale with seat comes fully assembled (shown below).

[Image: Figure 2-4. Wheelchair Scale with Seat in an Upright Position]

To open the chair, gently pull up on the seat portion of the scale and pull down on the legs so that they straighten out and rest on the scale platform.

[Image: Figure 2-5. Secure Bracket]

Ensure the retaining bracket is secure (Figure 2-5).

CAUTION: The retaining bracket must click into place. If it doesn't click, it may not be secure and any weight applied to it may cause it to collapse.

The chair is ready to weigh patients while open and on the platform.

[Image: Figure 2-6. Chair Extended Down, Ready for Weighing Patients]

2.2.3 Insert Batteries

The six AA batteries supplied with the scale provide an average of 25 hours of continuous use.

To install the batteries:

Turn thumbscrew counterclockwise then remove battery cover.
Insert batteries into the battery chamber as illustrated.

[Image: Figure 2-7. Battery Chamber]

Put the cover in place and turn the thumbscrew clockwise to secure.

NOTE: Remove the batteries prior to storing if the product is not going to be used for an extended period of time.

NOTE: If the LO BAT indicator activates, for accurate weighing, replace the batteries or connect the scale to an AC power source as soon as possible.

2.2.4 Power Connection

An optional AC power adapter can be used when a power outlet is available.

!IMPORTANT: Only use power adapters supplied by or purchased from Rice Lake Weighing Systems. The use of a power adapter not from Rice Lake Weighing Systems voids the warranty.

[Image: Figure 2-8. Power Connection Site]

NOTE: The battery annunciator on the display turns off when using an AC power connection. The brightness of the backlight is reduced to 60% when using battery power.

3.0 Operation

This section describes the front panel and includes procedures for operation of the scale.

[Image: Figure 3-1. Front Panel Keypad]

3.1 Key Descriptions

The display has 10 front panel keys. Key functions are described in the table below.

!IMPORTANT: The front panel keys are very sensitive, so only a gentle press is required.

Key Name	On/Off	Print LB/KG	Zero >0<	Hold Release	BMI	TARE	CLEAR	ENTER	Up Arrows	Down Arrows
Function	Powers the scale on or off	Sends data out from the RS-232 port; Allows to toggle between kilograms and pounds providing that it is enabled in Configuration mode; Cannot toggle while in the BMI mode	Only functions if the current weight is stable and less than 2% of the capacity of the scale. Anything over 2% requires a recalibration	Displays most current weight value on the display and holds that value when the patient is off the scale. A second press releases the weight value. Not active while in BMI mode	Pressing the BMI key enables access to the BMI (Body Mass Index) mode (defaults when scale is turned on). The patient is gets on the scale, weight stabilizes and press the BMI key. The display then asks for the patient height to calculate out the patient BMI.	Used to remove the weight initially of anything on the scale that shouldn't be included in the total weight of the patient on the scale	When using the BMI function, the display looks for a height entry. Pressing Clear changes this entry back to 190.0 cm (default) or 5 ft, 7.5 in. Once BMI is displayed, pressing the Clear key exits BMI	Used to accept height in BMI mode; accepts the value of the parameter last entered and moves to the next stage. Pressing and holding Enter during startup will display ID. This is the first setup on entering into configuration mode	Adjusts the value of the flashing digit/number. Adjusts height input (0.5 in/0.5 cm) while in BMI mode	Adjusts the value of the flashing digit/number. Adjusts height input (0.5 in/0.5 cm) while in BMI mode

3.2 Weighing

Use the following steps to weigh.

Press [On/Off] to turn on the scale. 0.0 appears on the display along with the ZERO annunciator.
Place the patient on the scale. The patient's weight is displayed, the LOCK annunciator is on and the indicator beeps to indicate the end of the weighing process.
Press [LB/KG] to change the display from lb to kg and vice-versa.
Press and hold [On/Off] until OFF displays to turn off the scale.

3.3 Hold/Release Function

Use the following steps to use the Hold/Release function.

Press [On/Off] to turn on the scale. 0.0 prompts along with ZERO on the display.
Press [Hold/Release] once the patient's weight stabilizes. The patient's weight and the HOLD and LOCK annunciators remain on the display when the patient is off the scale.
Press [Hold/Release] again to return the scale to zero.

NOTE: Pressing [LB/KG] will not work while using Hold/Release function.

NOTE: Pressing [Hold/Release] prior to the patient getting on the scale will also hold the weight display.

3.4 Preset Tare

Use the following steps for the Preset Tare function prior to patient weighing if additional items are being used by the patient.

Press [On/Off] to turn on the scale. 0.0 appears on the display along with the ZERO annunciator.
Place additional item(s) on the scale.
Press [TARE] until the display returns to 0.0 and NET annunciator appears on the display.
Remove additional item(s) from the scale. The weight displays with a negative symbol to the left of it.

NOTE: Not removing the additional item(s) prior to patient weighing will also work.

5. Position the patient and additional item(s) on the scale. The display identifies the patient weight. The NET annunciator is still active. The weight of the additional item(s) remains stored in memory for the duration of this weigh in.

6. To cancel the tare weight, remove patient from the scale and press [TARE] until NET disappears from the display and the display turns back to 0.0 and GROSS appears.

NOTE: Tare weight is also canceled when the scale is turned off.

3.5 Toggle Tare

Use the following steps to use the Toggle Tare function when the additional item to be weighed is known.

Press [TARE] when the scale is empty and 0.0 displays. The default values prompts while 0.0 is flashing on the display (default is programmed to be 33.0 lb/15.0 kg).
Use [Up Arrows] and [Down Arrows] to adjust the value. Press [ENTER] to start the tare function. The NET annunciator turns on instead of the GROSS annunciator.

3.6 Using the Body Mass Index (BMI) Function

Use the following steps in determining the BMI.

3.6.1 LB Mode

Ensure that the scale is at zero.
Place the patient on the scale to obtain a weight. The LOCK annunciator appears on the display.
Press [BMI]. The BMI and FT/IN annunciators appear on the display and a default height value of 5 feet - 7.5 inch (5 - 07.5) is flashing.
Use [Up Arrows] and [Down Arrows] to adjust the height value.
Press [ENTER].
The BMI value and BMI annunciator are shown on the display. Press [CLEAR] to return to the Weighing mode and the BMI function will be turned off.

3.6.2 KG Mode

Ensure that the scale is at zero.
Place the patient on the scale to obtain a weight. The LOCK annunciator appears on the display.
Press [BMI]. The BMI and CM annunciators appear on the display and a default height value of 170.0 cm (170.0) is flashing.
Use [Up Arrows] and [Down Arrows] to adjust the height value.
Press [ENTER].
The BMI value and BMI annunciator are shown on the display. Press [CLEAR] to return to the Weighing mode and the BMI function will be turned off.

3.7 Troubleshooting

Refer to the following table to check and correct any failure before contacting service personnel.

Symptom	Possible Cause	Corrective Action
Scale does not turn on	Dead batteries Faulty electrical outlet Bad power supply	Replace batteries or connect to AC power Use a different electrical outlet Replace adapter
Questionable weight or the scale does not zero	External object is interfering with the scale Display did not show 0.0 before weighing Scale is not placed on a level floor Scale is out of calibration Scale base is touching floor during a weighment	Remove the interfering object from the scale Help the patient off the scale, zero the scale and begin the weighing process again Ensure scale is level and begin the weighing process again Check the weight with a certified calibration weight Adjust height of feet so fingers can slide between the base of scale and the floor all the way around the platform
The load on the scale exceeds the capacity of the scale	Remove the excess weight and use the scale according to manufacture specifications
The display shows a STOP message	The display shows E and Err messages as detailed below
The display shows LO Bat message	The battery is low	Replace batteries
E06	Identifier - ADC	AD too high
E07	ADC	AD too low
E10	Overload	Scale has been overloaded. Remove load from scale
E4L	BAT	Battery low, but still usable - one bar left on indicator display
E4U	BAT	Battery low and unstable - no bars left on indicator display
E11	CAL	Calibration Error - recalibrate scale
Err 1	Load cell cable may be plugged into wrong connection port	Ensure cable is connected to the load cell connection port. Note: Load cell connection point is located underneath the curved plastic cover of the indicator. Remove four back retaining screws, remove curved back cover to access load cell connection point.
Err 2	Low saturation state (low A/D)	The load cell is not connected properly; Check the cables and mechanical connections; if the problem persists, replace the set of load cells
Err 3	High saturation state (high A/D)	See Err 2
Err 6	Unstable weight; Cannot calibrate	Check the load cell mechanical surroundings and ensure nothing is contacting the load cell and that the cables are properly welded
Err 7	Scale isn't moving	Make sure feet are installed on the scale. Turn the feet all the way in and then back them out three full turns, then level the scale
SAT	Damaged load cell cable Load cell cable may be plugged into wrong connection port	Replace load cell cable Ensure cable is connected to the load cell connection port. Note: Load cell connection point is located underneath the curved plastic cover of the indicator. Remove four back retaining screws, remove curved back cover to access load cell connection point.

4.0 RS-232 Communication

The unit comes with an RS-232 port that enables weight data to be transmitted to other equipment, such as a computer or printer. The RS-232 cable with DB-9 connector (PN 100719) is available from Rice Lake Weighing Systems. That connection is shown in USB Connection section on the next page.

The RS-232 parameters are:

9600 baud (selectable in the programming mode)
8 data bits
1 stop bit
no parity
no handshaking

There are three methods of communication:

Push-button keypad print
Standard remote protocol
Escape protocol

4.1 Push-button Keypad Print

With a stable, in-range weight, press and hold [Print] for at least three seconds, or until the scale emits two quick beeps.

NOTE: If the scale does not beep after five seconds, release [Print] as the weight was either in motion or out of range.

If displaying weight and not BMI, the scale will send out the following 21 character string: xxxxxxxxxx<SP>uu<SP>mmmmm<SP><CR><LF>

Token	Description
XXXXXXXXX	Weight with decimal point and "-" sign
<SP>	Space
uu	Unit - lb or kg
mmmmm	Mode - gross or net
<CR>	Carriage return
<LF>	Line feed (moves cursor down to the next line)

Example:

-10 Lb net = <SP><SP><SP><SP>-10.0<SP>lb<SP><SP>Net<SP><SP><SP><CR><LF>

10 Lb gross = <SP><SP><SP><SP>SP>10.0<SP>lb<SP>Gross<SP><CR><LF>

The scale will send out the following data while in BMI mode (displaying the BMI value):

Setting	Value
Gross Weight	215 Lb
Tare Weight	0.0 Lb
Net Weight	215 Lb
Patient Height	6-01.0 ft
Patient BMI	28.4

4.2 USB Connection

The scale has the capability of connecting to a Windows® computer (PC) using a USB cable (not included) and a terminal emulation program. A terminal emulation program allows the transfer of data between the scale and PC using a serial port.

[Image: Figure 4-1. Connection Ports]

NOTE: Apple® and Macintosh® computers are unable to transfer the necessary data to the scale. Only use a PC for data transfer.

Connecting software and downloads should always be addressed by the IT department for safety reasons and can vary depending on what type of computer platform is being used.

NOTE: Consult the IT department if driver protections are preventing the use of the USB driver. Driver protections may need to be temporarily disabled on Windows 10 or later computers to allow for the installation of the USB driver.

Connect the scale's indicator to a PC using a USB-Type B to USB-Type A cable (not included).
Turn the indicator on.

NOTE: In most cases, the PC should find the driver and automatically configure the driver when the scale is plugged into a USB port.

Open a terminal emulation program, such as Advanced Serial Port Terminal, pUtty or Hercules (used in this example).
Connect to the serial port assigned by the PC (COM5 in example). This can be found in Device Manager. Once selected, press Open.

[Image: Figure 4-2. Connecting to a Serial Port]

With weight on the scale, press and hold the Print button on the indicator for three seconds. The patient's weight is sent to the PC.

[Image: Figure 4-3. Patient Weight Displayed]

5.0 Maintenance

The following section provides instructions for maintaining and cleaning the unit.

!IMPORTANT: Do not immerse the scale in cleaning or other liquid solutions.

Do not use Isopropyl alcohol or other solutions to clean the indicator display surface.

5.1 Basic Maintenance

Before the first use of the scale and after periods of non-use, check the scale for proper operation and function. If the scale does not operate correctly, contact a qualified service personnel.

Go through the following steps for basic maintenance.

Check the overall appearance of the entire scale for any obvious signs of damage
Inspect the condition of the AC power adapter cord for cracking, fraying or for broken or bent prongs

5.2 Cleaning

Proper care and cleaning is essential to ensure a long life of accurate and effective operation. Before beginning the cleaning process, disconnect the scale from the AC power source.

Clean all external surfaces with a clean, damp cloth or tissue. Mild soap and water solution may be used. Dry with a clean soft cloth
Do not immerse the scale into cleaning or other liquid solutions
Do not use Isopropyl alcohol or other solutions to clean the display surface

6.0 Specifications

Power

120 VAC - 9 VDC - 60Hz / 230 VAC - 9 VDC - 50Hz

Battery Type

6 AA size Alkaline batteries

Battery Use

25 hours continuous use

Automatic power-off can be configured

Data Communications

RS-232 with RJ-45 jack

USB Connection

Selectable baud rate, default - 9600

8 bits

No parity

1 stop bit

No handshaking

Environmental

Operating Temperature: 50°F to 95°F (10°C to 35°C)
Storage Temperature: 32°F to 122°F (0°C to 50°C)
Humidity: 85% relative humidity

Capacity and Graduation

1000 lb x 0.2 lb (453 kg x 0.1 kg)

Dimensions

Platform Dimensions: 48.5 in W x 29.5 in L x 2.3 in H

Models: 350-10-4, 350-10-4 Dual Ramp Wheelchair Scale With Seat, 350-10-4, Dual Ramp Wheelchair Scale With Seat, Wheelchair Scale With Seat, With Seat, Seat

File Info : application/pdf, 20 Pages, 1.26MB

m 151806 350-10-4 op enus revf

	Rice Lake 350-10-4 Dual-Ramp Wheelchair Scale Technical Manual This technical manual provides comprehensive information on the Rice Lake 350-10-4 Dual-Ramp Wheelchair Scale with Seat, covering its features, operation, assembly, maintenance, and specifications. It is designed for safe weighing of handicapped and mobility-challenged individuals.
	Rice Lake 350-10-4 Dual-Ramp Wheelchair Scale Operation Manual Comprehensive operation manual for the Rice Lake 350-10-4 Dual-Ramp Wheelchair Scale with Seat, covering setup, operation, maintenance, and specifications.
	Rice Lake 350-10-3M Dual-Ramp Digital Wheelchair Scale Operation Manual This operation manual provides comprehensive guidance for the Rice Lake 350-10-3M dual-ramp digital wheelchair scale. Learn about setup, safe operation, key functions like Body Mass Index (BMI) calculation, maintenance procedures, and troubleshooting tips for this reliable medical weighing system.
	Rice Lake 350-10-8S Digital Stretcher Scale Technical Manual Comprehensive technical manual for the Rice Lake 350-10-8S Digital Stretcher Scale, covering assembly, operation, configuration, communications, maintenance, and specifications.
	Rice Lake 350-10-3M Dual-ramp Digital Wheelchair Scale Technical Manual This technical manual provides comprehensive instructions for the Rice Lake 350-10-3M Dual-ramp Digital Wheelchair Scale, covering assembly, operation, configuration, maintenance, and specifications.
	Rice Lake 350-10-3M Dual-ramp Digital Wheelchair Scale Operation Manual This operation manual provides detailed instructions for the Rice Lake 350-10-3M Dual-ramp Digital Wheelchair Scale, covering setup, operation, maintenance, troubleshooting, and specifications. Learn how to use the scale for accurate patient weighing and BMI calculations.
	Rice Lake 350-10-8S Digital Stretcher Scale - Specifications and Features Detailed information on the Rice Lake 350-10-8S digital stretcher scale, including its features, specifications, dimensions, and available options for medical facilities.
	Rice Lake 350-10-3M Dual-Ramp Digital Wheelchair Scale Operation Manual Operation manual for the Rice Lake 350-10-3M Dual-Ramp Digital Wheelchair Scale, covering setup, operation, maintenance, and specifications.