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© 2004. Scaletron Industries Ltd. Plumsteadville, PA Scaletron. Scaletron Sets The Standard In Corrosion Resistance. Model 1099, Model 2310, Model 2330, Model
2350, Model 2352, Model 2353, Model 3001, Model 3002, Model 3003, Model 3004, Model 3005, Model 3006, Model 4010, Model 4020, Model 4021, Model 4030,
Model 4040, Model 4041, Model 5305, and Pro-Gram Guide are trademarks of Scaletron Industries Ltd. Total Electronic System is a service mark of Scaletron
Industries Ltd. All Rights Reserved. PRINTED IN U.S.A. OCT 2004
cylinder on to the scale base being sure that the cylinder does not sit on the base. When
cylinder is centered, turn the tare knob (located on the door of the indicator) counterclockwise,
until the known weight of the contents is displayed on the LCD. (Ex: You have a cylinder that
holds 150 lbs. of contents. Load the cylinder on the scale, and turn the black tare knob located
on the front of the indicator door until the weight of the contents, 150 lb., is displayed on the
LCD display. You are ready to start using the contents.)When cylinder is empty, remove old
cylinder, and load new one using the instructions above.
Use this procedure for the filling and using of a stationary Tank or Drum:
1. Load an empty tank onto the base, and attempt to center the cylinder as much as possible.
Be sure cylinder is not touching the base frame, and is entirely on the disk.
2. Turn black tare knob on indicator box until display reads “0” lb. (This is to tare out the
empty cylinder weight).
3. Fill cylinder. Display will show how much net weight (cylinder contents) as you fill and then
use the material.
4. Use contents in cylinder. Weight will decrease as you use the contents.
5. When scale reads 0 lb., the contents have been completely used. Fill tank and begin
process again.
V. Calibration Procedure:
The Model 4020™ Drum Scale is pre-calibrated at the factory to within specified
accuracy, and is calibrated to standards traceable to the Bureau of Weights and Measures.
No further calibration should be necessary. If the electronics or load cells in the base
are being replaced, the following procedure should be used.
1. Once scale is leveled with no weight on scale, it is ready for calibration. Turn black knob
(tare pot) on front panel fully clockwise, then turn back counter-clockwise one full turn. (This
will assure enough tare adjustment when calibration is completed.) Adjust SW-B zero switches
1-6 and R-25 to obtain a zero reading on digital display. Do not move shorting pin on J-8
unless SW-B 1-6 and R-25 adjustments cannot reach a zero reading. J-8 will reverse the
adjustment polarity and thus double the range of the adjustments.
2. After a zero reading is obtained a known weight (such as a certified test weight) should be
placed on the scale.
Note: Calibration is done at the factory and should only need adjustment of R-12, or slight
switch change to set span to desired weight.
Wait for a minute so a reading can be obtained. Adjust R-12 or SW-A 1-6 span switches to
obtain gross weight desired.
3. Adjustment of span interacts with the zero setting previously made and Step (1) must be
repeated, followed by the repeat of Step (2) until both readings remain correct with weight on
or off scale without adjustment.
4. Analog output is selectable as scale powered, or loop powered. If scale is to supply the
power for the loop, J-4 must be in the “S” (scale) position. The 4-20 mA output will be
available at TB-1 Terminal 5 & 6. (5= -) & (6= +) 220 Ohm load max.
If the device connected to the scale is to supply power for the loop, then the jumper, J-4 must
be in the “L” (loop) position and the signal will be available at TB-1 terminals 4 (common) and 5
(+1). (220 Ohm load at 15 VDC, or 440 Ohm load at 30 VDC max.)
Note: Output is selectable as 4-20 mA, 0-20 mA, or +12 mA, -8 mA, with jumper, J-7. Two
pins closest to R-43 are for 0-20 mA, two center pins are for 4-20 mA, and the two pins farthest
