Scaletron 2308B Installation and operation manual

OEM Manual
MODEL 2308B™
Battery Operated
3 ½ Digit Electronic
Gas Cabinet Scale

1
© 2011. Scaletron Industries Ltd. Plumsteadville, PA Scaletron. Scaletron Sets The Standard In Corrosion Resistance. Model 1099, Model 2305, Model
2306, Model 2307, Model 2308, Model 2310, Model 2330, Model 2350, Model 2352, Model 2353, Model 3001, Model 3002, Model 3003, Model 3004,
Model 3005, Model 3006, Model 4000SS, Model 4010, Model 4020, Model 4021, Model 4030, Model 4040, Model 4041, Model 4042 and Model 4042WB,
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. NOV 2011.
These instructions generally describe the installation, operation, and maintenance of subject
equipment. The manufacturer reserves the right to make engineering refinements that have not been
described herein. Should any questions arise that may not be answered specifically by these
instructions, they should be directed to Scaletron Industries Ltd., Or Our Sales Agent for a
response.
All possible precautions were taken in packaging each piece of equipment to prevent shipping
damage. Carefully inspect each item and report damages immediately. Report all damage claims to
the shipping agent involved for equipment shipped F.O.B. job site. Do not install any damaged
equipment.
All instructions given on any labels, or attached tags, should be followed. Carefully inspect all
packing material before discarding to prevent the loss of accessories, mounting hardware, spare parts,
or instructions.
TABLE OF CONTENTS PAGE
I. GENERAL DESCRIPTION…………………………………………………………………………….1
II. SPECIFICATIONS………………………………………………………………………………………2
III. ASSEMBLY AND START-UP…………………………………………………………………………2
IV. GENERAL USE INSTRUCTIONS………………………………………………………………….2-3
V. CALIBRATION PROCEEDURE………………………………………………………………………3
VI. TROUBLESHOOTING……………………………………………………………………………..3 - 4
VII. BOARD DIAGRAM & 4-20mA CONNECTION DIAGRAM…………………………………….5 - 6
I. General Description:
The Model 2308B™ Digital Gas Cabinet Scale is designed for weighing cylinders 9 inches in
diameter and smaller, with a maximum net weight of 199.9 lb. and a maximum tare weight of
150 lb. The low profile design of the platform allows for safe and easy loading and unloading of
cylinders. The printed circuit board contains a separate tare and span control. The weigh meter
electronics are housed in a NEMA 4X enclosure for mounting on wall or a cart, and has a
momentary switch button mounted on the front panel.
Standard Parts
1 Base assembly 1 Weigh Meter with momentary switch
1 Technical Manual 1 Sealed rechargeable NiMH battery pack
1 Wall charger for battery pack
Available Options
A. Remote mounting of standard enclosure
B. Load Cell Cable

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© 2011. Scaletron Industries Ltd. Plumsteadville, PA Scaletron. Scaletron Sets The Standard In Corrosion Resistance. Model 1099, Model 2305, Model
2306, Model 2307, Model 2308, Model 2310, Model 2330, Model 2350, Model 2352, Model 2353, Model 3001, Model 3002, Model 3003, Model 3004,
Model 3005, Model 3006, Model 4000SS, Model 4010, Model 4020, Model 4021, Model 4030, Model 4040, Model 4041, Model 4042 and Model 4042WB,
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. NOV 2011.
C. Low Level relay contact
D. Transporting Cart
II. Specifications:
Display: LCD, 3 ½ Digit with minus sign liquid crystal display, 0.5 inch high, seven segment
Resolution: Single cylinder 199.9 lb x 0.1 lb, or 90.7 kg. x 0.1 kg.
Load Cell Excitation: 12 VDC Power, 4 Load cells
Zero Adjustment: Internal potentiometer, External tare knob
Overload: Blanks with “1” displayed at the far left of the display
Accuracy: +/- 0.5% full capacity
Power: (4) 9 Volt batteries
Dimensions: Standard unit: 9 inches x 9 inches
III. Assembly and Start-Up:
The Model 2308B™ Digital Gas Cabinet Scale is shipped partially disassembled. If Cart Option
is selected, it is completely assembled and ready for use. (Please skip to General Use Section).
Assembly instructions are as follows:
The load cells are secured and mounted in the base housing. All wire connections in the base
have been made and sealed at the factory. The digital weigh meter is assembled and calibrated
to the base at the factory. The customer must mount the indicator on the wall, or cart if option is
selected. The wires must be run through the strain relief, connected to the connector, and
plugged into indicator before scale is operated. Steps are as follows:
Step 1: Remove all parts from box and inspect for damage –bent metal, broken wires, cracks
in indicator, etc. Any shipping damage must be reported to carrier!
Step 2: Place the scale on a solid, dry, and even surface. Clear the area of all debris where
the scale base will be placed.
Step 3: Open the weigh meter (indicator) and install one black liquid tight fitting in the hole.
Feed the wire up through the fitting and snug the fitting on the wire. Fasten the indicator to the
wall. Connect the wires into the connector using the following code:
TB1 : Ret: Common, 4-20mA Return*
Out: + 4-20mA Output*
W: White = - Signal
R: Red = + Supply Voltage
Bk: Black = - Supply Voltage
G: Green = + Signal
*Connect your wires here if you are using 4-20mA output. Refer to the wiring diagram on page
5 and 6 for 4-20mA connections. Jumper J-4 will need jumper in the top two pins for loop
powered, and the bottom two pins for scale powered (with board oriented as in drawing pg 5.)
Insert the wire, being sure not to crimp the insulation in the connector. Using a small
screwdriver, push the orange lever down to insert the wire into the proper hole and
release the lever to allow the wire to clamp into the connector. The connector holes are
labeled according to the color that is inserted there.
IV. General Use Instructions:

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© 2011. Scaletron Industries Ltd. Plumsteadville, PA Scaletron. Scaletron Sets The Standard In Corrosion Resistance. Model 1099, Model 2305, Model
2306, Model 2307, Model 2308, Model 2310, Model 2330, Model 2350, Model 2352, Model 2353, Model 3001, Model 3002, Model 3003, Model 3004,
Model 3005, Model 3006, Model 4000SS, Model 4010, Model 4020, Model 4021, Model 4030, Model 4040, Model 4041, Model 4042 and Model 4042WB,
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. NOV 2011.
Please refer to these instructions for daily use of this scale. These instructions simulate
the procedure for every day usage. To apply power on the 2308B™, you must press and
hold the momentary switch located on the top of the indicator box.
To load a cylinder for weighing, please follow these steps:
1. If you know what the Tare Weight of your cylinder (the weight of an empty cylinder),
you may use the following procedure: With nothing on the scale base, press the momentary
switch button to apply power to the unit. Turn the black tare knob (located on the top of the
indicator box) counterclockwise, until the tare weight is shown on the LCD indicator as a
negative number. (Ex: Your cylinder is stamped with a tare weight of 100 lbs. You turn your
tare knob counterclockwise until it reads “–100”. Then you load the cylinder on to the base.)
Do not load the cylinder on before you have reached the tare weight. After your tare weight is
set, load cylinder on to scale base, and take a reading of the NET WEIGHT on the scale.
Please note that the battery life will be greatly decreased with this method due to applying
power for a prolonged period of time.
-OR-
2. If you know the gross weight of the cylinder does not exceed 199.9 lb, and you want to
see the GROSS WEIGHT on the display, use the following procedure: Set the tare knob to read
“0” on display. Load the full cylinder on to the scale base. Press the momentary switch button
on the indicator box to apply power for approximately 3 seconds, and take reading off of the
display.
V. Calibration Procedure:
The Model 2308™ Digital Gas Cabinet 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. Press and hold the button on the indicator to apply power to the indicator.
2. WITH NO WEIGHT APPLIED TO THE SCALE, turn the black tare knob on the outside of the
door of the indicator in the clockwise direction to make sure that there is at least +10 lb. of
weight in the tare knob. If not, adjust R-6 to see a positive reading. Once that is established,
turn the black tare knob on the door of the indicator counter-clockwise until it stops (DO NOT
OVER TURN KNOB OR YOU WILL DAMAGE THE TARE POT!) Once it reaches the most
negative reading, make sure you have at least –150 lb. on the display. If the tare span is large,
you may get to a –1 reading and this is a weight under-load condition. Turn R-6 until you see a
number a number that is not “below” –199.9 lb.
3. Adjust tare knob on front of weigh meter until scale reads zero with no weight on platform.
Adjust R-22 to set the 4mA reading to 0lbs.
4. Place a known weight on the base plate, as close to center as possible. Weight should be
equal to ½ of capacity, or greater.
5. Adjust R-15 until display reads weight of test weight on scale disc.
6. To complete calibration of 4-20mA output, adjust R-19 for proper 20 mA adjustment reading.
Factory setting is for 20 mA at 150.0 lb (68 kg.) unless specified otherwise.
7. Calibration is complete if specified accuracy is obtained.
VI. Troubleshooting:

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© 2011. Scaletron Industries Ltd. Plumsteadville, PA Scaletron. Scaletron Sets The Standard In Corrosion Resistance. Model 1099, Model 2305, Model
2306, Model 2307, Model 2308, Model 2310, Model 2330, Model 2350, Model 2352, Model 2353, Model 3001, Model 3002, Model 3003, Model 3004,
Model 3005, Model 3006, Model 4000SS, Model 4010, Model 4020, Model 4021, Model 4030, Model 4040, Model 4041, Model 4042 and Model 4042WB,
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. NOV 2011.
1. If display reads: “-1”:
A. Gross under-load. Turn knob clockwise. Numbers should reappear and can be
adjusted to tare weight or zero as required.
B. Check load cell connections at indicator, and connect wires as per diagram on Page
5.
2. If display reads: “1”:
A. Gross over-load. If starting point was zero, the cylinder weight is more than 199.9 lb.,
or kg.
B. If starting point was –150.0 lb. (68kg.) then the cylinder weight is more than 349.9 lb.
(158 kg.). Remove weight and recheck tare setting.
C. Check load cell connections according to page 2.
3. If no display (not lit):
A. Check power to weigh meter by pressing momentary switch button.
B. Battery pack may need to be recharged. Connect battery pack to the charger (only as
supplied by Scaletron) and fully recharge the battery pack.
4. Other Problems:
A. Consult the Factory!
USA & Canada Toll-Free: [phone]
Tel: [phone] Fax: [phone]
Notice: Do not return any equipment without first contacting the factory. A return authorization
number will be issued and it must be marked on all materials returned to the factory,
accompanying a letter that explains the problem specifically. A Serial Number will also be
required. It is located inside the indicator box.

5
© 2011. Scaletron Industries Ltd. Plumsteadville, PA Scaletron. Scaletron Sets The Standard In Corrosion Resistance. Model 1099, Model 2305, Model
2306, Model 2307, Model 2308, Model 2310, Model 2330, Model 2350, Model 2352, Model 2353, Model 3001, Model 3002, Model 3003, Model 3004,
Model 3005, Model 3006, Model 4000SS, Model 4010, Model 4020, Model 4021, Model 4030, Model 4040, Model 4041, Model 4042 and Model 4042WB,
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. NOV 2011.
VII. Board Diagram:

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© 2011. Scaletron Industries Ltd. Plumsteadville, PA Scaletron. Scaletron Sets The Standard In Corrosion Resistance. Model 1099, Model 2305, Model
2306, Model 2307, Model 2308, Model 2310, Model 2330, Model 2350, Model 2352, Model 2353, Model 3001, Model 3002, Model 3003, Model 3004,
Model 3005, Model 3006, Model 4000SS, Model 4010, Model 4020, Model 4021, Model 4030, Model 4040, Model 4041, Model 4042 and Model 4042WB,
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. NOV 2011.
VIII. 4-20mA Diagram: