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Gram 250 by Gram Precision
The following instructions are reproduced word for word from the original instructions that were included with scales that we received from the manufacturer in late October 2003.
Thank you for your purchase of this precision equipment. This user friendly and feature rich scale has been designed with you in mind. With proper care and treatment, this product will provide you with countless years of precision performance.
It is recommended that you carefully read this instruction manual prior to operating your scale.
Gram 250 Digital ScalePower Source
There are two main sources to power this scale:
Battery Operation:
One 9V Alkaline is required. To install, open the battery cover located on the bottom of the scale. Connect the battery on to the snap. Please make sure excessive force is not used. Carefully replace battery into the compartment and snap door back. Please remove battery during periods of storage or extended periods of non-use.
AC Adaptor Operation:
Depending on the type of AC Adaptor provided, the unit will operate on either 115V or 220V AC. To use, simply connect the adaptor plug into the connector located at the rear of the unit.
Calibration Procedure
It is very important to perform the user digital auto calibration procedure prior to normal operation. It is also recommended that this calibration procedure be performed in case the scale is moved to a different location or long periods of non-use. As the calibration procedure is quite simple, it is also recommended that this procedure is done on a regular interval in order to allow for constant accuracy over long periods of use.
The digital auto calibration process is done through the keypad and by using the correct calibration weight. Internal calibration is performed by the factory and authorized technician. An attempt by the end user to internally calibrate the scale will void the warranty.
Digital Auto Calibration Procedure:
  1. Turn balance on and allow the unit to acclimate and stabilize for two minutes.
  2. Press and hold the "CAL" key until the display shows a flashing weight reading. The flashing weight reading indicates the correct weight that must be placed on the tray.
  3. With the display still flashing, press the off key. The display will now show "CAL 0". Wait for 3 seconds and then gently place the correct calibration weight on the center of the tray.
  4. The display will now show "CAL F" and then return to normal operating mode. The calibration is complete when the display correctly shows the weight that is placed on the platter and the display has stabilized.
  5. Remove the calibration weight and press the tare key to reset the zero point.
In case "CAL E" is displayed instead of "CAL F"; this indicates a calibration procedure error. Turn the scale off and then turn on and repeat the procedure.
Digital Auto Calibration: Allows for convenient user digital calibration from the keypad.
Parts Counting: This feature allows parts counting capability for up to four parts counting units of 5, 10, 25 or 50 pieces that can be pre-set for ease of operation.
Power Up Test: Upon turning the scale on, it will go through an internal self test procedure and test the digital display. This will last for about 3 seconds and the scale will then reset to zero.
Stable Reading Indication: A right facing arrow will appear on the right side of the display to indicate the current weighing mode in use. When a weight is placed on the tray, this arrow will disappear while the scale stabilizes and will reappear once the stable weight reading is achieved.
Memory: The Memory function is designed to enable the user to store values and then add these values into a sample or procedure. The memory feature is useful when multiple weighing of different samples is needed and a total gross weight of all samples is required.
Overload: When the load placed exceeds capacity, an "E" will show on the display. Remove the excess load and the scale will return to normal.
Negative Reading: Once all weight is removed from the tray, any tared value left in memory will be displayed as a negative value. Press the Tare key to return to zero.
Tare: Allows users to reset the scale to zero at anytime. This feature can also be used to remove the weight of an empty container initially prior to the weighing procedure. Place the empty container such as scoop, beaker, etc. and wait for a stable reading. Press Tare key to zero the scale. This will discount the weight of the container and only the net weight of the sample will be read.
Auto Off: This is a convenient battery saving feature and is only activated when a battery is used as a power source. The unit will automatically turn off after 4 minutes of no activity.
Turn On To Last Setting: This convenient feature allows the scale to turn on to default at the last weighing mode it was used at.
The Keypad
CAL/MODE: This key allows for two functions. Cal is used for the digital auto calibration procedure described in the calibration procedure of this manual. The "Mode" part of this key is a menu to change weighing modes. Each time the key is pressed the arrow on the display will go to a different weighing mode. As a feature, the scale normally will default to the previously used weighing mode.
ON/MEMORY: Press this key to turn the unit on.
The Memory feature key allows for the cumulative weighing of samples. Following is the instruction for the memory function:
  1. If required, the container may first be tared to permanently remove the container's weight from the additive procedure. To tare the container, place the container on the tray and wait for a stable reading. Next, press the Tare key to zero the scale.
  2. Place the first sample on the tray until weight desired is acheived.
  3. Press the Memory key to reset the scale to zero. The memory symbol will appear on the upper left corner of the display which indicates that the weight value has been stored.
  4. Add the second sample.
  5. Press the Memory key. The symbol will disappear from the display and the new combined weight of the first and second samples is now indicated. Simply repeat steps to add further samples.
When all loads are removed, the display may show a negative value if the container was tared initially. In this case, simply press the Tare key to reset to zero.
TARE: This key will reset the scale to zero. The Tare key can also be used to eliminate the weight value of a container. To tare the weight of a container, place the empty container on the scale and press the tare key. The display will return to zero and the weight of the container has been permanently removed from the weighing procedure. When all weight is removed from the tray, the tared value will be displayed as a negative value. Press Tare key again to return the scale to zero.
OFF: Press to turn the scale off.
Parts Counting
  1. To set to parts counting mode, use the CAL/MODE key, which acts as a menu key to select weighing mode. With every press of the CAL/MODE key, the weighing mode changes and the arrows on the display indicates the mode. Keep pressing the CAL/MODE key until you scroll to a down facing arrow that appears on the lower left corner of the display. 5 is the minimum parts quantity number.
  2. Continual pressing of the CAL/MODE will enable you to select the required parts counting unit. The options are 5, 10, 25 and 50 pieces. The option of 50 is the end of the menu and the setting will then return back to gram setting.
  3. With the selected parts counting unit still flashing on the display, place the desired sample on the tray top. Allow the sample to stabilize for about 5 seconds and then press the OFF key. The parts counting function is now set for the selected 5, 10, 25 or 50 pieces quantity.
Gram 250 Digital ScaleCare and Maintenance
This product is sensitive to its surroundings and is affected by variations in humidity, temperature, gravitational fields, electrostatic fields and vibrations. For optimum performance, please keep the following simple tips in mind when using this product.
  • Please allow the product to acclimate to the environment and stabilize to a constant temperature prior to calibration and use. A 2 minute warm up time would be sufficient.
  • Do not expose this product to lengthy periods of heat or cold. The temperature of optimum performance is 64F ~ 77F (18C ~ 25C).
  • For optimum performance, avoid exposure to dust, vibration, electrostatic fields, air currents and close proximity to other electronic devices.
  • Operate with care. Do not force or drop items to be weighed on to the tray top. Gently place items on to the tray top to avoid sensor damage.
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