For safe operation of the weighing indicator, please follow these
instructions:
● Calibration inspection and maintenance of the indicator are prohibited by non-pro-
fessional staff
● Please ensure that the indicator rests on a stable surface
● The indicator is a piece of static sensitive equipment; Please cut off power during
electrical connections
● Touching the internal components by hand is prohibited
● DO NOT exceed the rated load limit of the unit
● DO NOT step on the unit
● DO NOT jump on the scale
● DO NOT use this product if any of the components are cracked
● DO NOT use for purposes other then weight taking
● To avoid damaging the battery do not keep charger plugged in once battery is fully
charged
● Make sure the weight is not over the Max capacity as it could damage the load cell
inside
● Material that has a static electric charge could inuence the weighing. Discharge
the static electricity of the samples, if possible. Another
solution to the problem is to wipe both sides of the pan and the top of the case with
an anti-static agent
Please take anti-static prevention measures
Any accumulated charge on the body of the human operator should be discharged rst
before opening the protective container with ESDS devices inside. The discharge can
be accomplished by:
● Putting a hand on a grounded surface or, ideally, by wearing a grounded Anti-static
Wrist Strap and an Anti-static Mat
PREPARATION & SET UP
● Plug into a wall outlet to avoid interference with other wirings
● Turn on the balance while there is no load
● We suggest to warm-up the balance by powering on 5 minutes before use for
accurate weighing
● Calibration may be required before weighing when the balance is initially installed
or moved from a location
FEATURES
● Multiple weighing units: (kg/g/lb/oz/lb:oz)
● Gross/Tare/Zero
● Count weighing
● Accumulation weighing
● Overload / Underload indication
● Print
● Splash proof keyboard and display
● Can connect to a secondary large display/scoreboard
● Relay output (optional)
● 4-20mA analog output (optional)
● Can connect to a PC or printer for data logging (optional)
● Wireless capability (optional)
Indicator Model Options
The OP-900 series consists of the OP-900A (LED) series and OP-900B (LCD)
series. Options for rechargeable battery, stainless steel enclosure, computer connection,
relay output and analog output can be added.
Please contact sales@optimascale.com for a list of possible options.
Technical Parameters
● Accuracy class: 5000 e
● Resolution - Display: 30,000 ; ADC: 2,000,000
● Zero stability error: TK0 < 0.1μV//K
● Span stability error: TKspn < ± 6 ppm//K
● Sensitivity (internal): 0.3 μV / d
● Input voltage: -30 to +30mV DC
● Excitation circuit: 5 VDC, 4 wire connection, 6 load cell of 350ohm max
● AC power: AC 100-250V (use only the included 9V adapter supplied)
● Operation temperature: -10 °C ~ +40 °C
● Operation humidity: ≤90%RH
● Storage temperature: -40 °C ~ +70 °C (32-104°F)
SPECIFICATIONS
FIGURE 1: INDICATOR MEASUREMENTS
POWER SUPPLY
AC Adapter
If the indicator is powered by an adapter, plug the adapter directly into the “DC” pin
located at the bottom of the indicator. We recommend to plug into a wall outlet to avoid
interference with other wirings.
Battery (Optional)
If you have an indicator with the rechargeable battery option, please charge the
internal battery fully before rst time use. A 110 to 220V AC adapter should be
provided with your indicator. Please use only the AC adapter provided to prevent damage to your indicator. To keep the battery in best condition, fully discharge the battery
every month by leaving the indicator on until the indicator powers off, and then recharge
fully. If the battery is not going to be used for a long period of time it is recommended to
remove it to avoid leakage.
On OP-900A
● When the Battery is low the battery indicator light ashes red
● During charging the red light will stay lit
● The light will turn green once fully charged
ON OP-900B
●
●
symbol will indicate battery’s charge
symbol indicates that the battery needs to be charged
OP-900A (LED)
OP 900B (LCD)
DISPLAY AND KEY DESCRIPTION
ON/OFF Powers the Indicator On or Off if held for 2 seconds
Hold1. Peak hold - Grabs the highest weight (for tension and pulling force)
2. Data hold - Holds the current weight value (ex. for use with weighing
moving animals)
TOTAL1. Accumulates weights
2. Works with “Print” to perform the accumulation function and check the
accumulation result
UNITSShifts between weighing units (kg/lb)
COUNTUse the scale to count product based on a sample weight
TARE1. Zero’s the scale. Used when using a container to hold objects
2. Clears the tare to see the gross weight
ZEROZero’s the scale
PRINTPrint data
The scale is at zero
The scale is stable
GrossShows you are in Gross weight mode (includes tare); default mode
NetShows you are in Net weight mode (without tare)
pcsShows you are in Counting mode
totalShows you are in Accumulation mode
holdShows you are in Hold mode
lbThe weight is shown in pounds
kgThe weight is shown in kilograms
batteryFlashes red = low battery, Solid red = charging, Green = fully charged
OverFlashes when weight is higher than set alarm parameter
AcceptFlashes when weight is within the set alarm parameters
UnderFlashes when weight is lower than set alarm parameter
Power
Back
Save and Exit
Arrow keys
Return/Enter
OPERATING INSTRUCTIONS
Power On
● Turn on the power by pressing the power button for 2 seconds. Once on, the scale
will ash the voltage and then begin to auto-check and count down from 0-9
sequentially before entering the weighing mode
Note: Anything on the scale before powering on will automatically be tared out.
Zeroing
● When indicator is turned on the screen should read 0
● If the screen reads any number other than 0 before weighing, press the ZERO key
to set to 0
Unit Selection
● To switch between measuring units (kg, lb, oz) press the UNITS key
Tare Function
● When the indicator is in gross mode (gross light is shown) pressing the TARE key
will Tare the current weight on the scale and enter the net mode (net light shown)
● For example if you are using a container add the container to the scale, press tare
and the display will show the tare symbol
● Add your sample to the scale to weigh without the weight of the container
● To exit Tare mode press the TARE key again to enter gross mode
Note: If you remove the container the scale will show the minus weight of the container
To use a pre-set tare weight
● Press and hold the tare key for 2 seconds
● Input the tare weight using the arrow keys
● Press print key to conrm
and reset back to 0
Counting Function
● In weighing mode: Put a sample weight on the scale
● Then press the COUNT key to go to the counting mode (“pcs” will light up)
● It will then display the sample number (ex. PCS 0) which you can change using the
up or down arrows (Sample options are 5, 10, 20, 50, 100, 200, 500)
● Press the PRINT key to conrm your sample number
● The scale is now ready to start counting, load your product on the scale and the
indicator will show the quantity
● To exit counting mode press the COUNT key
● If you want to count a different product hold the PRINT and COUNT key together
and the sample pieces will reset back to zero
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