Optima Scale OP-905 User manual

optimascale.com
OP-905 INDICATOR
USER’S MANUAL

TABLE OF CONTENTS
Safety Precautions 1
Preparations and Set Up 1
Features 2
Specications 3
Power Supply 4
Displays 5
Display and Key Descriptions 6
Operating Instructions 7-9
Calibration 10
Indicator Parameter Settings 12-16
Helpful Denitions 17
Connectors 18-19
RS232 Serial Output Format 20-23
4-20 mA Analog Output 24
Relay Output 25
Troubleshooting 26
Q&A 27
Contact Us 28

1
SAFETY PRECAUTIONS
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 inuence 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 indicator while there is no load
●Calibration may be required before weighing when the scale is initially installed or
moved from a location

2
FEATURES
Suitable for Bench scales, oor scales and truck scales, this indicator works with 32bit
CPU and 24bit high precision ADC. It is made with a Stainless Steel housing. Excellent
performance make it proper for varied interface function. Waterproof connector and
cable connection xed inside.
●Multiple weighing units: (lb/kg)
●Gross/Tare/Pre-Set Tare/Zero
●Multiple Hold functions
●Count weighing
●Accumulation weighing
●Check weighing
●Overload / Underload indication
●Connects to printer
●Splash proof keyboard and display
●Connects to a Remote Display/Scoreboard
●Power saving mode
●Can connect to a PC or printer for data logging (optional)
●Wireless capability (optional)
● 20 mm Letter LED display
●Rechargeable battery
● RS232 output
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, 12 load cell of 350ohm max
● AC power: AC 110V
● Battery 6V4Ah
● Operation temperature: -10 °C ~ +40 °C
● Operation humidity: ≤85%RH
● Storage temperature: -40 °C ~ +70 °C (32-104°F)
● Weight: 7lbs (3.2kg)
● Dimensions: 11.25” x 4” x 9.5” (260x160x80mm)

3
ON/OFF
Hold Unit
Count Esc
Tare Set
Check Print
Zero
Total Del
12 3
456
789
0
Gross NetHold Total pcs lb kg Battery
zero
Hi
OK
Lo
OP-905
#
10.25”
11.25”
9.5”
6.25”
3.25”
4”
3.14”
5.11”
1.77”
SPECIFICATIONS
FIGURE 1: INDICATOR MEASUREMENTS

4
POWER SUPPLY
AC Adapter
We recommend to plug into a wall outlet to avoid interference with other wirings.
Battery
Please charge the internal battery fully before rst time use. 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.
● 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
OP-905 (LED)
Keypad and Display
OVER
ACCEPT
UNDER
0
Gross Net Hold Total Pcs LB KG
Battery
Cap. _______x D_____
ON/OFF
HOLD UNIT CHECK PRINT
TOTAL DEL COUNT ESC
TARE ZERO SET
1 2 3
4 5 6
7 8 9
0
C#
MODEL OP-905 CLASS III

5
DISPLAY AND KEY DESCRIPTION
HOLD Holds the weight on the scale Depending on the parameter setting
UNIT Shifts between weighing units
CHECK Checking the record by number
PRINT Print the weighing data
TOTAL In gross mode: get the tare weight
In net mode: clear the tare, get the Gross
DEL Delete the previous weighing data and the saved record
COUNT Use the scale to count product based on a sample weight
ESC Back to weighing
TARE 1. Zero’s the scale. Used when using a container to hold objects
2. Clears the tare to see the gross weight
ZERO Zero’s the scale
SET Conrm the action
ON/OFF Powers the Indicator On or Off if held for 2 seconds
CClear the input
#Conrm the input
The scale is at zero
The scale is stable
Gross Shows you are in Gross weight mode (includes tare); default mode
Net Shows you are in Net weight mode (weight without tared weight)
Hold Shows you are in Hold mode
Total Shows you are in Accumulation mode
Pcs Shows you are in Counting mode
LB The weight is shown in pounds
KG The weight is shown in kilograms
Battery Flashes red = low battery, Solid red = charging, Green = fully charged
Over Flashes when weight is higher than set alarm parameter
Accept Flashes when weight is within the set alarm parameters
Under Flashes when weight is lower than set alarm parameter

6
OPERATING INSTRUCTIONS
Power On
●Turn on the power by pressing the ON/OFF 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
●The zero function is used only when the scale is empty and is not at zero due to
material build up
● Pressing the ZERO key while the scale is stable will reset your scale to 0
●Depending on what your manual zero range parameter is set to, you can zero out
any weight within your set selection, after that you will receive an error and will
need to tare out the weight
Unit Selection
●To switch between measuring units (kg/lb) press the UNITS key
Tare Function
To Tare: When in gross mode, press TARE to enter net mode and tare out the weight
●The Tare function is used when you only wish to see the current change in weight,
not the entire amount of weight that is on the scale
●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 and reset back to 0
●Add your product to the scale to weigh without the weight of the container
●To exit Tare mode press the TARE key again to enter gross mode and you will see
the total weight of the container and the product
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 and SET key at the same time
● Input the weight you want tared on the keypad
● Press TARE key to conrm
● Press TARE to reset back to 0
TARE

7
Accumulation
●The accumulated function is used to add multiple weights and total them together
● You can add up to 999 different weights together
● In weighing mode load the rst weight, once stable press the TOTAL key to enter
the accumulated mode. The “total” light will display
● Remove the rst weight and add the second weight to the scale
● Once stable press TOTAL key to add the weight to the accumulated total
● Repeat previous steps until all desired weights have been added to the total (max 999
times)
● When you are done and want to display the accumulated total, press the TOTAL and
SET key together. The accumulated number “n###” (the number of weights you
are adding together) will ash on the display followed by the total
● If you want to print the accumulated total, hold the PRINT key for one second
●To exit accumulated mode, press the ESC key
● To delete the saved weights press the DEL key followed by the set key to conrm
●Repete this process to cleaer all saved weights
TOTAL
TOTAL
TOTAL SET
+
DEL SET
Print
● If the indicator is connected to a printer and the weight on the scale is stable press the
PRINT key to print the current weight
Note: In tare mode the printer can not print if negative weight is shown

8
Counting Function
●The counting function is used to count a high volume of identical parts. You can do
this by setting a sample and then either adding to the sample or taking away from
the sample to count the number of objects on the scale
● In weighing mode: press COUNT to enter count mode
●Then press COUNT and SET at the same time to set your sample with the keypad
● (ex. If you are counting pencils, you would add a sample of pencils to the scale, if
you add 50 pencils to the scale you would enter 50 on the keypad.)
●Press #on the keypad to set your sample
●The scale is now ready to start counting, load your product on the scale and the
indicator will show the quantity
● (ex. if you add 450 pencils to your sample of 50, the scale will read 500 pencils)
●To see the weight on the scale press COUNT
●To exit counting mode press the ESC key
● If you want to count a different product hold the COUNT and SET keys together to
enter a new sample
+ 450 pencils
COUNT
SETCOUNT +
Hold
There are 4 different hold functions you can choose from in the C11 parameter
1. Peak Hold: Grabs the highest weight (for materials testing, ie. tension and pulling
force)
●Press the HOLD key then add weight to the scale
●The indicator will show the highest weight it recorded and hold it on the screen until
a higher weight is placed on the scale
2. Manual Hold: Grabs the current weight and holds it so it will not change/uctuate
● While weighing, press HOLD and the indicator will hold the current weight on the
screen until HOLD is pressed again
3. Auto Hold: If the weight on the scale is above 20d (20 x division) and is stable,
the indicator will hold that weight on the screen for 3 seconds then go back to general
weighing
●Pressing the hold key is unnecessary, holding is done automatically when the scale
is stable
4. Average Hold: Used for animal weighing, the indicator will display the average
weight sampled from 3 seconds