Scientech 10K Series - Manual (Page 6)

Environment:
1. The more stable your environment, the better your measurement results. Changes in temperature, pressure, and humidity
affect balance performance and weight stability. Ideal room conditions are 20º C with a relative humidity between 45% and
60%. Fluctuations in temperature should not exceed 1º C per hour. Humidity fluctuations should not exceed 10% per hour.
2. Balances should not be placed in close proximity to anything that shakes, vibrates, or stirs violently. Avoid placing your
equipment near centrifuges, vortexers, or shakers.
3. Do not place your balance and/or scale near anything that generates heat. Heat will cause the balance chamber to warm and
due to the effects of the thermal expansion introduce large errors into your measurement. Do not place the balance near a
window. Sunlight can penetrate the window, warm the balance chamber at different rates during the day, and affect the
quality of your work.
4. Avoid placing the balance near sources of drafts, extreme air currents, or near air-conditioning vents. These positions can
cause your readings to be unstable and can dramatically cool the balance chamber when the air-conditioning system begins to
run.
5. The measurement environment should be clean and free of excessive contaminants. Contaminants such as dirt and grease
can adversely affect the weight of an object.
Operator:
1. Never touch a weight with your bare hands. Oils and contaminants from your hand will be transferred to the weight and
introduce a significant error. It is recommended that all weights be manipulated with gloved hands or forceps. The two types
of gloves that are commonly used and accepted are either latex (powderless) or cotton. Avoid any metal to metal contact
when handling or storing weights. This will cause scratches that may introduce error. All weight forceps and weight lifters
should be either nonmetallic (plastic or wood) or if metal, covered with a soft protective coating or material to avoid
scratches.
2. Place the weight or sample near the center of the balance pan. A small offset from center can have a pronounced effect and
introduce undue variation.
3. Take special care not to breathe onto the weight or into the balance chamber. Back away from the instrument. This will
prevent any thermal transfer of heat from your breath or body to the balance, the weight, or the sample.
4. Time your measurements. Consistent sample times will provide more consistent measurement.
Front Panel Controls:
Figure 5 - Balance Front Panel
The ON/OFF Button:
When the balance is off, pressing the ON/OFF button will start the turn on sequence shown in Figure 4. During this sequence the
balance is doing an automatic systems checkout to insure it is functioning properly.
If your balance was purchased with the optional 9000-INT motorized internal calibration weight, all objects on the stainless steel pan
must be removed before turning on the balance using the front panel ON/OFF switch. Press the ON/OFF button and observe the turn
on sequence shown in Figure 4. With the 9000-INT installed, the balance will then load the internal weight on and off the weighing
sensor in order for the internal weight to be positioned correctly. Please wait until all weight readings have stopped changing, the
“OK” annunciator appears, and the motor is silent before zeroing the balance and starting weighing operations.
When the balance is on, pressing the button will turn off the display.
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