Hanchen BSM Series Technical manual

Operation Instruction
BSM Series
Electronic Precision Balances

Contents
Application····················································1
Safety Precautions··············································2
Getting Started·················································3
Function Instruction···········································7
Operation·····················································8
Basic Weighing Function··············································8
Calibration and Adjustment···········································9
External Calibration················································· 10
Application Programs············································ 12
Counting·························································· 13
Weighing in Percent·················································15
Density Determination··············································17
Animal Weighing/Averaging··········································19
Toggling between Weight Units·····························21
Balance Setting·················································22
Setting the Parameters (Menu Codes)·····································23
Parameter Settings (Overview)··········································23
Troubleshooting Guide··················································25
Care and Maintenance··················································26
Safety Instructions·············································· 26
Overview······················································· 27

Application
BSM Series Electronic balance could weighing from 120g to 6200g.
BSM Electronic balance could ensure the accuracy and trustiness of the weighing result
with the splendid performance:
Could eliminate the influence of bad circumstance like vibration and airflow effectively
With reliable and nice repeatability
With firm structure
BSM Series Electronic balance：fast weighing, simple operation, to predigest and accelerate
the normal weighing process greatly.
In order to ease your weighing work, BSM series also with the following function to meet
your work needs:
Weighing unit transfer
Counting
Percentage
Animal weighing(Average)
1

Safety Precautions
Safety Instructions
Please read these operating instructions carefully before using your balance to prevent
damage to the equipment.
△Do not use this equipment in hazardous areas/locations.
△The balance housing may be opened only by authorized technicians who have been
properly trained at the factory.
△Make sure you disconnect the balance from power before connecting or disconnecting
peripheral devices to or from the balance.
△If you operate the equipment under ambient conditions that require higher safety standards,
you must comply with the installation regulations applicable in you country.
△When cleaning your balance, make sure that no liquid enters the balance housing; use only
a slightly moistened cloth to clean the balance.
Installation:
△Make sure the voltage rating printed on the AC adapter is identical to your local line
voltage.
Proceed with extreme caution when using pre-wired RS-232 connecting cables, as the pin
assignments may not be compatible with our company’s equipment. Check all pin
assignments against the cabling diagrams and disconnect any lines that do not match.
△If there is visible damage to the equipment or power cord, disconnect the equipment from
power and lock it in a secure place to ensure that it cannot be used for the time being..
Connect only our company’s accessories and options, as these are optimally designed for
use with your balance. The operator shall be responsible for any modifications to the
equipment and for any connection of cables or equipment not supplied by us and must
check and, if necessary, correct these modifications and connections. On request, we will
be happy to provide information on operating specifications(in accordance with the
Standards for defined immunity to interference).
The only way to cut off the electrical source completely is disconnect the power cord.
Keep the power cord away from the liquid.
Do not open the balance. If the seal is broken, this will result in forfeiture of all claims
under the manufacturer's warranty.
If you have any problems with your balance, please contact our local office, dealer or
service center.
Packing list
Balance
pan
pan support (just for BSM-120.4，BSM-220.4，BSM-220.3，BSM-320.3，BSM-420.3，
BSM-520.3，BSM-620.3)
Shield ring (just for BSM-120.4，BSM-220.4，BSM-220.3，BSM-320.3，BSM-420.3，
BSM-520.3，BSM-620.3)
AC adapter
Operation instruction
2

Getting Started
Storage and Shipping Conditions
Do not expose the balance to extreme temperatures, moisture, shocks, blows or vibration.
Unpacking the Balance
After unpacking the equipment, please check it immediately for any external damage.
If damage is evident, refer to the instructions under “Safety Inspection" in the chapter
entitled “Care and Maintenance."
Save the box and all parts of the packaging for any future transport.
Disconnect all cables before packing the balance for shipping!
Installation
BSM Electric balance could provide a more reliable weighing result with normal
circumstance. Choose a location that is not subject to the following negative influences:
Put on a stable and flat top
Heat (heater or direct sunlight)
Drafts from open windows and doors
Extreme vibrations during weighing
Avoid corrosive gas with certain protection
Excessive moisture
Conditioning the Balance：
Moisture in the air can condense on the surfaces of a cold balance whenever it is brought
into a substantially warmer place. If you transfer the balance to a warmer area, make sure to
condition it for about 2 hours at room temperature, leaving it unplugged from AC power.
3

Getting Started
Installation
Place components inside the chamber in the
following order:
Shield ring
Pan support
Weighing pan
Place components inside the chamber in the
following order:
Weighing pan
4

Getting Started
Connecting the Balance to AC Power/Safety Precautions
Use only original BSM power adapter.
Insert the right-angle plug from the AC adapter into the jack on the balance.
The AC adapter rated to Class Ⅱcan be plugged into any wall outlet without additional
safety precautions.
Antitheft Locking Device
You can use the security device on the back of the balance to avoid the steal behavior.
You can use chain or lock to insert into the security device, and connect with a fix point.
Connecting Electronic Peripheral Devices
Make sure to unplug the balance from AC power before you connect or disconnect a
peripheral device(printer or PC) to or from the interface port.
Warm up Time
To deliver exact results, the balance must warm up as list below after initial connection to
AC power or after a relatively long power outage.
All models: at least 30 minutes
Only after this time will the balance have reached the required operating temperature.
Using Verified Balances in Legal Metrology:
Allow the equipment to warm up for at least 24 hours after initial connection to AC power.
5

Getting Started
Leveling the Balance
Purpose:
To compensate for unevenness at the place of installation
Only the 2 front feet are adjusted to level the balance
whose weighing capacity is below 2kg.
Turn the 2 front feet as shown in the diagram until the air
bubble is centered within the circle of the level indicator.
Adjust the Leveling feet until the air bubble is centered
within the circle on the level indicator.
> In most cases this will require several adjustment steps.
6

Function Instruction
Overview of Display and Operating Elements
Display/Panel instruction
Position Designation
1. Weight units display.
2. Weight units display; additional information display.
3. Weight digits display.
4. Symbol for stand-by mode.
5. Tare/Zero key.
6. On /off key.
7. Calibration key. Start calibration/adjustment routine.
8. Clear Function key. This key is generally used to cancel functions.
-Quit application program
-Cancel calibration/adjustment routine
9. Menu Key.
10. Function key. Start application program
11. Data output. Press this key to output readout values to the built-in data interface.
7

Operation
Basic weighing function
Purpose
The basic weighing function can be used alone or in combination with an application
program(counting, weighing in percent, etc.).
Features
Taring the balance
Printing weights
Before using the balance at the first time, calibrate and adjust it at the place of use; For
details, see “Calibration and Adjustment” in the next chapter.
The temperature range (℃) indicated on the verification label may not be exceeded during
operation.
Working with BSM-120.4,BSM-220.4,BSM-220.3, BSM-320.4,BSM-420.4,BSM-520.3,
BSM-620.3 Models:
Working with the microbalance requires a steady hand and a smooth, uninterrupted technique.
Use forceps or other suitable utensil to place the sample on the weighing pan.
Perform a number of test measurements before you begin weighing, to allow the temperature
inside the weighing chamber to adjust to the ambient temperature outside the chamber.
Otherwise, if the chamber door was closed for a longer period of time prior to beginning
weighing, the sudden change in temperature inside the chamber when you open the door
might affect the weighing result. This is why a series of test measurements is recommended;
the repeated opening and closing of the weighing chamber door, at the same rate of speed
as well be used during the actual weighing sequence, will both compensate this difference
in temperature to some extent and help you develop a smooth working rhythm.
Place the sample gently on the weighing pan. The weight result should stabilize within 3 to
5 seconds. The degree of precision attained increases in proportion as the weighing operations
become more consistent.
Preparation
Blank display indicates that the balance was disconnected from power. For example, the
first time the balances is put into operation, or after a power outage.
Switch on the balance: Press ［ ］
All symbols on the display light up briefly.
When you turn on the balance, the symbol is display until the balance is ready to work.If
the symbol is displayed during operation, this indicate that the processor is performing a
function and cannot receive further commands at the moment.
Taring the balance ：press［TARE］key
Additional Functions
Switching off the balance: Press［ ］
A circle in the lower left-hand corner of the display indicates that the balance has been
switched off and is in stand-by mode.
8

Operation
Example
Simple Weighing
Settings: Application program: .. (default setting)
Step Key(or instruction) Display/Data output
1. Switch on the balance. ［ ］ + . g
Self-test is performed,
followed by automatic
initial tare function.
2. Place container on the balance + . g
(in this example,52 g).
3. Tare the balance. ［TARE］+ . g
4. Place sample in container
on balance(in this example, 150.2 g). + . g
9

Operation
Calibration and Adjustment
Purpose
Calibration is the determination of the difference between the weight result and the true
weight(mass) of a sample. Calibration does not entail making any changes within the
balance.
Adjustment is the correction if any difference between the measured value display and the
true weight(mass) of the sample, or the reduction of the difference to allowable level within
the maximum permissible error limits.
Features
Calibration/adjustment can be performed only when:
there is no load on the balance,
the balance is tared, and
the internal signal is stable.
If these conditions are not met, an error message is displayed.(refer to the Error information)
The weight displayed for the sample on the balance must not differ from the nominal
weight by more than 2%.
You can only use g as unit to make calibration.
External Calibration/Adjustment in Verified Balances of Accuracy class II
When the balance is used in legal metrology, external calibration/Adjustment is blocked by
a seal over the menu access switch.
△Important note for calibration/adjustment of the BSM-120.4,BSM-220.4,BSM-220.3,BSM-
320.3, BSM-420.3, BSM-520.3, BSM-620.3 model: Close the chamber before calibration/
adjustment to get collect result.
The permitted operating temperature range for balances used in applications subject to legal
metrology (legal for trade) is restricted as follows:
Balance of accuracy class I
+15℃to 35℃(+59 to +95℉)
Balance of accuracy class II :
+15℃to 35℃(+59 to +95℉)
10

Operation
External Calibration
The weight required for calibration/adjustment is defined in the factory settings (see “Specifications”).
Step Key (or instruction) Display/Data output
1. Zero the balance ［TARE］. g
2. Start calibration [CAL] PLEASE WAIT
The balance will show
“PLEASE WAIT”,
after stable it will Display the
prompted calibration weight
(In this sample, 200g) + . g
CAL
4. Apply the prompted calibration + . g
CAL
weight
5.Calibrate Weight [CAL] + . g
The balance will show the weighing
value and blink. After stable, the
balance will beep a sound and return
to the normal weighing mode to finish
the calibration
6. Remove the calibration weight. . g
11

Application Programs
Application Programs
Function Keys
[F]key: Start application program/store component
Toggle between units
press and hold for 2 seconds
change reference quantity (counting),
reference percentage (weighing in percent)
or number of measurements (animal weighing)
[CF] key: End application program; delete
Calculated values are alternately indicated with the
following symbols:
Percent = %
Piece count (Counting) = pcs
Computed value = o,
12

Application Programs
Counting
Menu code: . .
Display symbol: pcs
Purpose
With the Counting program you can determine the number of parts that each have
approximately equal weight. To do this, a known number of parts (the reference sample
quantity) is weighed first, and the individual piece weight (reference weight) is calculated
from this result. Thus the number
of parts subsequently placed on the balance can be determined from their weight.
Features
The minimum load is equal to one digit defined according to the resolution of the active
weight unit.
Long-term storage of the last reference sample quantity “nRef" entered.
Toggling between piece count and weight by pressing [F].
Function Keys
[F]: Begin determination of piece weight
> Application program initialized with predefined reference sample quantity.
[CF]:
End application program; clear initialization data
Default/Initial parameter
Reference piece:10 (Menu code: ..)
Preparation
Set parameters for the Counting program: reference Balance setting
Select the application program : Menu code: . . Counting
Set the following parameters:
Code . . 5 pieces
Code . . 10 pieces
Code . . 20 pieces
Code . . 50 pieces
Code . . 100 pieces
Please reference Balance setting
13

Application Programs
Example
Counting parts of equal weight
Settings:
Menu: Counting program (menu code: . . )
Reference pieces：20 pieces(code . . )
Step Key (or instruction) Display/Data output
1.switch on the balance ［ ］
2. Tare the balance. ［TARE］. g
3. Display reference pieces ［F］>2 sec (briefly)
(in this sample is 20 pieces)
4. Add reference sample quantity
to container(in this example: 20 pcs,66g). + . g
5. Print piece count, if desired. ［F］+ pcs
wRef+3.300 g
6. Add uncounted parts as desired. + pcs
(in this example: 40pcs)
7. Display weight. ［F］+ . g
8. Display piece count. ［F］+ pcs
9. Unload the balance. pcs
10. Delete reference sample quantity [CF]>2 sec
11. Repeat as necessary, starting from Step 6.
14

Application Programs
Weighing in Percent: (Menu code: . . )
Purpose
This application program allows you to obtain weight readouts in percent which are in
proportion to a reference weight.
Features
Storage parameter (rounding-off factor) for storing the reference weight
to calculate the percentage can be configured.
Changing the reference sample percentage in the menu: reference the chapter Balance
setting.
Optional automatic output of the reference weight to the data interface port when print
application parameters is set.
Press and hold the (F) key (2 seconds) to set the reference percentage
Toggling between percentage and weight by pressing (F).
Default/Initial parameter
Reference percentage：10( code: ..)
Preparation
Set parameters for the Weighing in percent program: reference Balance setting
Select the application program : Menu code:. . weighing in percent
Set the following parameters:
Code . . 5%
Code . . 10%
Code . . 20%
Code . . 50%
Code . . 100%
Please reference Balance setting
15

Application Programs
Example: Determining residual weight in percent
Settings:
Menu: Weighing in percent program (menu code:. . ),
Reference percentage: ref 100% (Code: . . )
Step Key (or instruction) Display/Data output
1.Switch on balance. ［ ］
2. Tare the balance. ［TARE］. g
3.Dislay refrence percentage. ［F］>2 sec
4.Place on the weight,
as reference percentage + . g
(in this sample is 222.5g）
5. Optional: print percentage. ［F］+ . %
WXX%+222.500 g
6. Place the residual weight
（in this example is 322.5g）+ . %
7. Display weight ［F］+ . g
8. Display percentage ［F］+ . %
9. Unload the balance. . %
10.Delete reference percentage ［CF］>2 sec
11. Repeat as necessary, starting from Step 6.
16

Application Programs
Density Determination: (Menu code: . . )
Purpose
This application program lets you determine the density of solid substance using the buoy-
ancy method. You can have results displayed with one decimal place, or no decimal places:
see “Configuration.”
Note: the sample holder and suspension wire used in the example below are not included
with the balance/scale.
Features
Set the display accuracy in the Setup menu: see “Configuration.”
Default/Initial parameter
Accuracy of the density result ：1 decimal point ( code: ..)
Preparation
Set parameters for the Weighing in percent program: reference Balance setting
Select the application program : Menu code:. . density determination
Set the following parameters:
Code . . No decimal point
Code . . 1 decimal point
Code . . 2 decimal point
Code . . 3 decimal point
Please reference Balance setting
17

Application Programs
Example: Determining the density of a solid sample.
Settings:
Menu: Density determination (menu code:. . ),
Accuracy of result: 1 decimal point (Code: . . )
Step Key (or instruction) Display/Data output
1.Switch on balance. ［ ］
2.Attach sample holder to suspension wire
3.Tare the balance. ［TARE］.g
4.Start application program. ［F］.g dec
5.Display water density used [MENU]_.coe
6.Input the density value by
hold and release the [MENU] key. Hold&Release [MENU].coe
(in this sample is 0.99707g/cm3）
7.Confirm the input value ［F］.g Air
8.Determine the weight of sample
in air:
Place the sample on the balance .g Air
9.Store value for weight in air ［F］.g Liq
10.Determine the weight of sample
in liquid:
Place the sample in the liquid .g Liq
11.Confirm the weight in the liquid. ［F］
Calculate the density .Rhl
12.Delete the result ［CF］
13. Repeat as necessary, starting from Step 4.
18