Salter Brecknell CS-250 User Manual

CS-250 Series

CHAIR SCALE

SERVICE MANUAL (v1.06D)

CS-250 Series Chair Scales Service Manual

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CONTENTS

1. PRECAUTIONS……………………………………………………………..2

2. INTRODUCTION……………………………………………………………3

3. SPECIFICATIONS……………………………………………………….....4

3.1Specifications………………………………………………………………...4

3.2 Load Cell Specification...............................................................…...5

4. INSTALLATION……….…………………………………………………….6

5. DESCRIPTION……….....................................................................8

6. OPERATION………………………………………………………………..10

1. Power ON/OFF…………………………………………………………10

2. Zero……………………………………………………………………...10

3. Tare……………………………………………………………………...10

4. Hold function…………………………………………………………....10

5. BMI function…………………………………………………………….11

6. Unit change…………………………………………………………….11

7. PARAMETER……………………………………………………………….12

8. CALIBRATION……………………………………………………………..1 4

9. BATTERY OPERATION…………………………………………………..15

10. RS-232 OUTPUT………………………………………………………………17

11. MAINTENANCE……………………………………………………………18

11.1 General………………………………………………………………..18

11.2 Error codes……………………………………………………………19

11.3 Determine the Problem……………………………………………...19

11.4 Testing Load Cell………………………………………………………19

11.5 Check PCB Voltages………………………………………………...21

11.6 Trouble Shooting……………………………………………………..21

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WARNING

DISCONNECT ALL POWER TO THIS UNIT
BEFORE INSTALLING, CLEANING, OR
SERVICING. FAILURE TO DO SO COULD
RESULT IN BODILY HARM OR DAMAGE THE
UNIT.

CAUTION

 Permit only qualified persons to service the instrument
 Before connecting or disconnecting any components, remove the

power.

 Failure to observe these precautions bodily harm or damage to or

destruction of the equipment.

1. PRECAUTIONS

 The chair scale is a precision electronic instrument, handle it

carefully.

 Do not install the scale in direct sunlight.
 Verify the local voltage and receptacle type are correct for

the scale.

 Only use original adaptor, other could cause damage to the

scale.

 Pluggable equipment must be installed near an easily

accessible socket outlet.

 Avoid unstable power sources. Do not use near large users

of electricity such as welding equipment or large motors.

 Avoid sudden temperature changes, vibration, wind and

water.

 Avoid heavy RF noise.
 Keep the scale clean

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2. INTRODUCTION

 The CS-250 series chair scales, that amplifies signals from a load cell,

converts it to digital data and displays it as a mass value.

 It is accurate, fast and versatile series of general purpose balances with %

weighing functions and accumulation.

 Ergonomically optimized seat, comfortable, safe and reliable.
 Grasp the handrails in two ways: gross grip area, vertical grip area.
 Handrails with rubber material, comfortable and safe.
 Adjustable angle of instruments to meet the user reading.
 4 transportation wheels with brake.
 Footrest foldable, when folded out with low distance to the floor.
 Each single armrest foldable.
 Bag for power supply fixed on the chair, when power supply not in use.
 Optional RS-232 interface, can connect computer and printer.

CS-250 Series Chair Scales Service Manual

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Model

CS-250

Maximum Capacity

250kg

Readability

100g

Resolution

1/2,500

Tare range

-249.9kg

Minimum Capacity

2000g

Linearity ±

200g

Common Specifications

Interface

RS-232 Output Optional

Stabilisation Time

2 Seconds typical

Operating Temperature

0°C - 40°C / 32°F - 104°F

Power supply (external)

12V/500mA AC power adapter

Calibration

Automatic External

ADC

Σ-Δ

Display

25 mm high 6 digits LCD with auto backlight and

loading bar graph

Housing

Aluminium platform, ABS plastic indicator

Gross weight

19kg

3. SPECIFICATION

3.1 Specifications

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Model No

L6D

Rated Capacity (kg)

2.5/3/5/6/8/10/15/20/30/35/40/50

Sensitivity

2.0±0.2 mv/v

Excitation Voltage

5~12V

Material

Aluminum

Cable

0.3~3m Φ 4mm

Input Resistance

409Ω ±6Ω/1065Ω ±15Ω

Out put Resistance

350Ω ±3Ω/1000Ω ±10Ω

Temperature Range

-35°C ~ +65°C

Safe overload

150%F.S

Ultimate overload

300%F.S

Error

±0.0233%F.S

Creep (20min)

±0.020%F.S

Zero Balance

0±5%mV/V

Max. Platform Size

250x350mm

3.2 Load Cell Specifications

CS-250 Series Chair Scales Service Manual

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4. INSTALLATION

Unpacking

Carefully take the balance out of its package, make it sure its not damaged and
all accessories are included.

 Remove the weighing scale from the carton.
 Remove the protective covering. Store the packaging and to use if you

need to transport the scale later.

 Inspect the scale and terminal for damage.
 Make sure all components are included

Accessories,

1. Balance

2. Adaptor

3. Product manual

Level Adjusting

Place the scale on a table.
Check the water mark. If, bubble is not centre

adjust the leveling feet until reach centre. Check
the level when you change the location.

Charging Battery

 To charge the battery insert the adaptor pin to jack, jack is locating rear side

of the scale. Adaptor simply plug into the mains power. The scale no
needs to be turned on.

 The battery should be charged for 12 hours for full capacity.
 In the display there is an indicator show the status of battery charging.

When the scale is plugged into the mains power the internal battery will be
recharged. If the indicator off, the battery has a full charge. If it is on, the
battery is nearly discharged and if yellow, the battery is being charged.

 Do not use any other type of power adaptor than the one supplied with the

scale.

 Verify that the AC power socket outlet is properly protected.

Note: Please charge the battery before using the scale for the first time

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Installation

RS-232 Connecter

USB Connecter
Load cell Connecter

Adaptor Jack

 Place the scale on a table.
 Connect the adaptor pin in to the scale adaptor jack. Adaptor jack is

locating, rear side of the scale.

 Adaptor connects into your AC power socket.

Pluggable equipment must be installed near
an easily accessible socket outlet with a
protective ground/ earth contact.

 Turn on the On/Off key. If you want to turn off,

press the key again.

 Display will be show the version number and will be starting self checking.
 After self checking, display will be come to normal weighing mode.
 Warm-up time of 15 minutes stabilizes the measured values after

switching on.

 Calibrate with exact calibration weights, minimum 1/3 of the scale capacity

want to use for calibration. For calibration see details in parameter.

Then you can start your operation