TFC SERIES
Inscale Measurement Technology Ltd
Tel: Fax: Email:
+44(0)1424 200722 +44(0)1424 443976 sales@inscale-scales.co.uk
7 Heron Close, St. Leonards-on-Sea. East Sussex TN38 8DX United Kingdom
Http:www.inscale-scales.co.uk
Solutions in Weighing Technology
Inscale Measurement Technology Ltd follows a policy of continuous improvement and reserves the right to change specifications without notice. © October 2002
INTRODUCTION
The TFC series of scales provides an accurate, fast and versatile series of counting
and check-weighing scales. There are 2 series of scales within the range, TFC scales
are Kilogram only scales and the TFCa range are changeable from pounds to
kilograms. The scales in these series share the same functions but special instructions
will be given for the TFCa series to account for the ability to change weighing units.
There are 3 models in each series, with capacities up to 300 kg. / 660 Lb.
They all have stainless steel weighing platforms on an Steel base assembly and a
display module mounted on a pillar attached to the base.
All the keypads are sealed, colour coded membrane switches and the displays are
large easy to read liquid crystal type displays (LCD). The LCD’s are supplied with a
backlight.
All units include automatic zero tracking, audible alarm for pre-set weights, automatic
tare, pre-set tare and an accumulation facility that allows the count to be stored and
recalled as an accumulated total.
SPECIFICATIONS
TFC SERIES
Model # TFC 60 TFC 150 TFC 300
Maximum
Capacity
60kg 150kg 300kg
Readability 5g 10g 20g
Resolution 1:15.000 1:15.000 1:15.000
Minimum
Capacity
100g 200g 400g
Repeatability
(Std Dev)
5g 10g 20g
Linearity ± 10g 20g 40g
Units of
Measure
kg
TFCa SERIES
Model # TFC 130a TFC 330a TFC 660a
Maximum
Capacity
130Lb/60kg 330Lb/150kg 660Lb/300kg
Readability 0.01Lb/5g 0.02Lb/10g 0.05Lb/20g
Resolution 1:13,000 / 1:15.000 1:16,500 / 1:15.000 1:13,200 / 1:15.000
Tare range -100Lb/-60kg -330Lb/-150kg -660Lb/-300kg
Minimum
Capacity
0.2Lb/100g 0.4Lb/200g 1Lb/400g
Repeatability
(Std Dev)
0.01Lb/5g 0.02Lb/10g 0.05Lb/20g
Linearity ± 0.02Lb/10g 0.04Lb/20g 0.10Lb/40g
Units of
Measure
Lb/kg
Common Specifications
Interface RS-232 Output Optional
Stabilisation
Time
2 Seconds typical
Operating
Temperature
0°C - 40°C
32°F - 104°F
Power supply 9Vdc from external power supply
Calibration
Automatic external
Display 3 x 6 digits LCD digital display
Draft shield N/A
Balance
Housing
Indicator ABS Plastic,
Base Steel with Stainless Steel platform
Pan Size 425mm x 525mm / 16.7" x 20.7"
Overall
Dimensions
(wxdxh)
425mm x 700mm x 950mm / 16.7" x 27.5" x 37.5"
Gross Weight 28kg/62lb
Applications General Purpose Parts counting Scale
Functions
kilogram weight, parts counting, accumulating memory, preset count with
alarm
Other
Features and
Specs
accuracy enhancement for parts counting, internal rechargeable battery (~70
hours operation)
INSTALLATION
GENERAL INSTALLATION
The scales should be sited in a location that will not degrade the accuracy.
Avoid extremes of temperature. Do not place in direct sunlight or near air conditioning
vents.
Avoid unsuitable tables. The tables or floor must be rigid and not vibrate. Do not place
near vibrating machinery.
Avoid unstable power sources. Do not use near large users of electricity such as
welding equipment or large motors.
Avoid high humidity that might cause condensation. Avoid direct contact with water. Do
not spray or immerse the scales in water.
Avoid air movement such as from fans or opening doors. Do not place near open
windows.
Keep the scales clean.
Do not stack material on the scales when they are not in use.
INSTALLATION of TFC SERIES
The pillar is attached to the base using a bracket that must first be attached to the base
frame using the 4 bolts supplied. The Pillar is secured to the bracket using 2 set
screws. The cable from the base to the indicator module is run through the tube, out
through the plastic support at the top. Excess cable can be stored within the tube.
The TFC Series comes with a stainless steel platform packed separately. Place the
platform in the base.
Level the scale by adjusting the four feet. The scale should be adjusted such that the
bubble in the spirit level is in the centre of the level and the scale is supported by all
four feet. If the scale rocks readjust the feet.
Attach the indicator module to the pillar by sliding it over the bracket with the flanges
engaged in the groves on the base. Attach the cable from the base to the connector
on the rear of the indicator.
Attach the power supply module to the connector on the side of the indicator. The
power switch is located next to the connector.
KEY DESCRIPTIONS
0-9, •
Numeric entry keys, used to manually enter a value for tare weights, unit weight, and
sample size.
CE
Used to clear the unit weight or an erroneous entry.
Zero or
Set the zero point for all subsequent weighing. The display shows zero.
Tare or
Tares the scale. Stores the current weight in memory as a tare value, subtracts the tare
value from the weight and shows the results. This is the net weight. Entering a value
using the keypad will store that value as the tare value.
M+ or
Add the current count to the accumulator. Up to 99 values or full capacity of the weight
display can be added.
MR
To recall the accumulator memory.
Smpl or
Used to input the number of items in a sample.
Unit Wt or
Used to enter the weight of a sample manually.
PST or
To set the upper limit for the number of items counted. When this upper limit is
exceeded the scale will sound the beeper. Backlight control setting.
Print or
To print the results to a PC or printer using the optional RS-232 interface.
TFCa SCALES ONLY
Kg/Lb key in place of Unit Weight key.
This key will select the weighing unit when the unit weight display is at zero. Or
acts as the Unit Wt key to enter known unit weights manually.
DISPLAYS
The scales have three digital displays. The displays show WEIGHT, UNIT WEIGHT and
QUANTITY.
WEIGHT DISPLAY
A 5 digit display to indicate the weight on the scale.
Arrows above symbols will indicate the following:
Low battery,
Net Weight Display, "Net"
Stability indicator, "Stable" or
Zero Indicator, "Zero" or
And in the TFCa models indications for kilogram "Kg" or Pound "Lb" units.
UNIT WEIGHT DISPLAY
This display will show the unit weight of a sample. This value is either input by the user
or computed by the scale. The unit of measure is grams on all scales with kilogram
weight units or in pounds on scales that show pounds.
Indicators will show when the scale has determined that there is an insufficient number
of samples to accurately determine the count: "Sample" or symbol.
Net
Mem ory Charging
Weight Unit Weight Count pcs
Lb. Kg.
Stable Zero
Sam ple Preset U. Weight
g
Net Memory Charging
Weight Unit Weight Count pcs
TFCa
Type
with
Lb/Kg
indicators
TFC Type
with
symbols
When the unit weight is not large enough to determine an accurate count, "U. Weight"
or symbol.
In both cases the scale continues to operate and the indications are to alert the user to
a potential problem.
If a preset count has been stored the "Preset" or
symbol will have an arrow above it.
COUNT DISPLAY
This display will show the number of items on the scale or the value of the accumulated
count. See OPERATION section.
Indicators will show when a value has been entered into memory when the arrow above
the "Memory" legend is on.
Just under the count display is an LED to indicate the status of battery charging. When
the scale is plugged into the mains power the internal battery will be charged. If the
LED is green the battery has a full charge. If it is Red the battery requires further
charging and yellow indicates the battery is being charged.
OPERATION
ZEROING THE DISPLAY
You can press the ZERO key at any time to set the zero point from which all other
weighing and counting is measured, within 4% of power up zero. This will usually only
be necessary when the platform is empty. When the zero point is obtained the Weight
display will show the indicator for zero.
The scale has an automatic rezeroing function to account for minor drifting or
accumulation of material on the platform. However you may need to press ZERO to
rezero the scale if small amounts of weight are shown when the platform is empty.
TARING
There are two methods to enter a tare value. The first uses the weight on the platform
and the second uses a value input by the user.
First Method:
Zero the scale by pressing the ZERO key if necessary. The zero indicator will be on.
Place a container on the platform, a value for its weight will be displayed.
Press the TARE key to tare the scale. The weight that was displayed is stored as the
tare value and that value is subtracted from the display, leaving zero on the display.
The "Net" indicator will be on. As product is added only the weight of the product will be
shown. The scale could be tared a second time if another type of product was to be
added to the first one. Again only the weight that is added after taring will be displayed.
When the container is removed a negative value will be shown. If the scale was tared
just before removing the container this value is the gross weight of the container plus all
product that was removed. The zero indicator will also be on because the platform is
back to the same condition it was when the ZERO key was last pressed.
Second Method:
This method allows you to enter a value for the tare weight from the keypad. This is
useful if all containers are the same or if the container is already full but the net weight
is required and the tare weight of the container is known.
Remove all weight from the platform, press the ZERO key to zero the display.
Enter the value for the Tare weight including decimal point using the keypad, press
TARE to store the tare value. The weight will show a negative value equal to the tare.
Place the container on the platform.
The display will then show the weight of the container minus the tare weight. Then
when the full container is put on the platform the tare value will be subtracted from the
gross weight displaying only the net weight of the contents.
If the value input is not consistent with the increment of the scale the scale will round
the tare value to the nearest value possible. For example if a tare value of 103g is
entered onto the 60Kg/5g scale then the display will show -105g.
TFCa SERIES ONLY
SETTING THE WEIGHING UNIT
The scale will turn on displaying the last weighing unit selected, either
kilograms or pounds. To change the weighing unit press the Lb/Kg key when
the unit weight display shows zero. If necessary press the CE key to clear the
unit weight before changing. If the unit weight display is not at zero then the
scale uses the value in the display to set a new unit weight.
PARTS COUNTING
SETTING UNIT WEIGHT
In order to do parts counting it is necessary to know the average weight of the items to
be counted. This can be done by weighing a known number of the items and letting the
scale determine the average unit weight or by manually inputting a known weight using
the keypad.
Weighing a sample to determine the Unit Weight
To determine the average weight of the items to be counted it will be necessary to place
a known quantity of the items on the scale and then to key in the quantity being
weighed.
The scale will then divide the total weight by the number of samples and display the
average unit weight.
Zero the scale by pressing the ZERO key if necessary. If a container is to be used,
place the container on the scale and tare as discussed earlier.
Place a known quantity of items on the scale. After the weight display is stable enter the
quantity of items using the numeric keys followed by the SMPL key. The number of
units will be displayed on the "Count" display and the computed average weight will be
shown on the "Unit Weight" display.
As more items are added to the scale, the weight and the count will increase.
If the scale is not stable, the calculation will not be completed. If the weight is below
zero, the Count display will show negative count.
Entering a Known Unit Weight
If the unit weight is already known then it is possible to enter that value using the
keypad.
Enter the value of the unit weight using the numeric keys followed by pressing the UNIT
WT key. The "Unit Weight " display will show the value as it was entered.
The sample is then added to the scale and the weight will be displayed as well as the
quantity based upon the unit weight. When weighing in kilograms the unit weight is
shown in grams. When weighing in pounds the unit weight is also in pounds.
PARTS COUNTING
After the unit weight has been determined or entered it is possible to use the scale for
parts counting. The scale can be tared to account for package weight as discussed in
an earlier section.
After the scale is tared then the items to be counted are added and the "Count" display
will show the number of items computed using the weight and the unit weight.
It is possible to increase the accuracy of the unit weight at any time during the counting
process by entering the count displayed then pressing the SMPL key. You must be
certain the quantity displayed matches the quantity on the scale before pressing the
key. The unit weight will be adjusted based upon a larger sample quantity. This will give
greater accuracy when counting larger sample sizes.
AUTOMATIC PART WEIGHT UPDATES
The scales will automatically update the unit weight when a sample equal to less than
the sample already on the platform is added. A beep will be heard when the value is
updated. It is wise to check the quantity is correct when the unit weight has been
updated automatically.
This feature is turned off as soon as the number of items added exceeds the count
used as a sample.
TFCa Series only:
The Unit weight key is labelled Lb/Kg as this key has a dual function. When the
scale is at zero and the unit weight display is showing zero the key will change the
scale from pounds to kilograms. When a value is entered into the Unit Weight
Display this key is not active for changing the weighing units and the scale will
automatically use the value for the unit weight if the Lb/Kg (UNIT WT) key is
pressed within 5 seconds.
COUNT PRESET or CHECK-WEIGHING
Check-weighing (Count Pre-setting) is a procedure to cause an alarm to sound when
the number of items counted on the scale meets or exceeds a number stored in
memory by using the PST key.
The stored value is entered from the keyboard. Enter the numeric value to be stored
using the numeric keys. Then press the PST key to store the value.
To clear the value from memory and thereby turn off the check-weighing feature, enter
the value "0" into the memory.
MANUALLY ACCUMULATED TOTAL
The values (weight and count) shown on the display can be added to the values in the
accumulator by pressing the M+ key. The "Weight " display will show the total weight,
the "Count" display will show the total accumulated count and the "Unit Weight" display
shows the number of times items have been added to the accumulation memory. The
values will be displayed for 2 seconds before returning to normal.
The scale must return to zero or a negative number before another sample can be
added to the memory.
More product can then be added and the M+ key pressed again. This can continue for
up to 99 entries, or until the capacity weight display is exceeded.
To observe the total stored press the MR key. The totals will be displayed for 2
seconds.
To clear the memory press MR to recall the totals from memory and then press the CE
key to clear all values from memory.
AUTOMATIC ACCUMULATED TOTALS
The scale can be set to automatically accumulate totals when a weight is placed on the
scale. This eliminates the need to press the M+ key to store values into memory.
However the M+ key is still active and can be pressed to store the values immediately.
In this case the values will not be stored when the scale returns to zero.
See the PARAMETERS Section for details of how to enable Automatic Accumulation.
BATTERY OPERATION
The scales can be operated from the battery if desired. The battery life is approximately
70 hours.
When the battery needs charging the arrow above the low battery symbol under the
weight display will turn on. The battery should be charged as soon as the arrow above
the symbol is on. The scale will still operate for about 10 hours after which it will
automatically switch off to protect the battery.
To charge the battery simply plug into the mains power. The scale does not need to be
turned on.
The battery should be charged for 12 hours for full capacity.
Just under the quantity display is an LED to indicate the status of battery charging.
When the scale is plugged into the mains power the internal battery will be charged. If
the LED is green the battery has a full charge. If it is Red the battery is nearly
discharged and yellow indicates the battery is being charged.
As the battery is used it may fail to hold a full charge. If the battery life becomes
unacceptable then contact
Inscale.
BACKLIGHT CONTROL
The backlight of the LCD can be set to be on full time, on only when a weight is on the
scale or turned off.
To set the backlight press and hold the PST key for 4 seconds.
The weight display will show “ EL xx” where xx is the current setting for the backlight.
Enter a value of 1, 2 or 3 to set the parameter.
Press 1, “EL AU” sets the backlight to operate automatically when a weight is placed
on the scale or a key is pressed.
Press 2, “EL Off” sets the backlight to be off.
Press 3, “EL on” sets the backlight to be on at all times.
Press the TARE key to store the value or press the ZERO key to escape from this
setting and return to weighing.
RS-232 OUTPUT
The TFC Series of scales can be ordered with an optional RS-232 output.
Specifications:
RS-232 output of weighing data
ASCII code
4800 Baud
8 data bits
No Parity
Connector: 25 pin d-subminiature socket
Pin 2 Output
Pin 3 Input, not used at this time
Pin 7 Signal Ground
Data Format
Normal Output
Data Format
Memory Recall Print
GS 123.4 Kg GS for Gross weight, NT for net weight, (with tare value stored)
U.W. 123 g Kg and g for metric and Lb for pounds.
PCS 1000 pcs
<lf> Includes 2 line feeds
<lf>
**********
<lf> Includes 1 line feed
TOTAL
No. 5
Wgt 123.4 Kg .
PCS 1000 pcs
<lf> Includes 1 line feed
**********
PARAMETERS
To set the parameters it is necessary to enter a secure menu. This is done by entering
a password number when requested.
To enter the parameter menus press the TARE key during the initial counting of the
display after power turned on. The Weight Display will show "PIn " requesting the
password number to be entered.
The default password is "0000" but other numbers can be set using the parameter
menus.
Press the "O" key four times. The display will show "PIn- - - -", Press the TARE key.
The Parameter menu has 7 functions that can be accessed using the Unit Wt. key
(Lb/kg key on TFCa series) to cycle through the choices. The Weight Display will
show the name of the functions. To enter a function press the TARE key. At any time
press the ZERO key to return to weighing.
Weight
Display
Description
F1 CAL See the calibration section for details
F2 dI
Set the scale increment. Press the Unit Wt. key to show the options.
Press the TARE key to accept the selection.
F3 dEC
Select Decimal point position, 0.00 or 0.000 by pressing the Unit Wt.
key.
F4 CAP Select the scale capacity.
F5 Cnt
Displays the A/D counts. Press the TARE key to return to menu.
F6 PIn Set a new password number. Display will show "P1 "
Enter the new password number then press the TARE key.
Display will change to "P2 ", Enter the password again and press the
TARE key again.
The display will show "donE" to show the new password has been
accepted.
Record the new password number in a secure place.
F7 Prt
Press the Unit Wt. key to show the options. Select "Prnt" to have the
scale print when the PRINT key is pressed. Or select "P Cont" to print
continuously.
.
CALIBRATION
The TFC scales calibrate using metric weights and the TFCa scales can calibrate using
either metric or pound weights, depending on the weighing unit in use before
calibration.
When the parameter menu show "F1 CAL" press the TARE key.
The display will then show "unLoAd" to request all weight be removed from the
platform.
Press the TARE key to set the zero point.
The display should then show the last calibration weight requested.
If this weight is acceptable then press the TARE key to accept it, or enter a new
calibration weight using the keypad then press the TARE key.
(To calibrate at 100.00 Kg simply type 100. Do not type the decimal place of following
zeros.)
The display will show "LOAd". place the calibration weight on the scale and press the
TARE key. The scale will calibrate and then start the initial check procedure counting
form 9 to 0. Remove the weight during the counting.
If an error message (Err 8) is shown during calibration recheck the calibration and
repeat it if necessary. If the problem persist then contact
Inscale for further assistance
After calibration the scale should be checked to verify the calibration and linearity is
correct. If necessary repeat calibration, especially be certain the scale is stable before
accepting any weight.
TFCa scales will also have the Lb or Kg indicator on to show the denomination of the
weight requested. If the scale was in pounds before starting calibration the weights
requested will be pound values, or if the scale was weighing in kilograms then metric
weights will be requested.
ERROR CODES
During the initial power-on testing or during operation it is possible the scale may show
an error message. The meaning of the error messages is described below.
If an error message is shown repeat the procedure that caused the message, turning
the balance on, calibration or other functions. If the error message still is shown then
contact your dealer for further support.
ERROR CODE DESCRIPTION POSSIBLE CAUSES
Err 4 Initial Zero is greater than
allowed (typically 4% of
maximum capacity) when
power is turned on or when
the ZERO key is pressed,
Weight on the pan when
turning the scale on.
Excessive weight on the
pan when zeroing the
scale.
Improper calibration of the
scale.
Damaged load cell.
Damaged Electronics.
Err 5 Keyboard Error. Improper operation of the
scale.
Err 6 A/D count is not correct
when turning the scale on.
Platform not installed.
Load cell damaged.
Electronics damaged.
Err 8 Calibration Error Attempt calibration again,
make sure the scale is
stable.
Manufacturer’s Declaration of Conformity
This product has been manufactured in accordance with the harmonised European standards,
following the provisions of the below stated directives:
Electro Magnetic Compatibility Directive 89/336/EEC
Low Voltage Directive 73/23/EEC
Inscale Measurement Technology Ltd.
7 Heron Close
St.Leonards-on-Sea
East Sussex TN38 8DX
United Kingdom
FCC COMPLIANCE
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. The
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.
Shielded interconnect cables must be employed with this equipment to insure compliance with the
pertinent RF emission limits governing this device.
Changes or modifications not expressly approved by
Inscale could void the user's authority
to operate the equipment.
©Copyright by Inscale Measurement Technology Ltd. All rights reserved. No part of this publication may be reprinted or
translated in any form or by any means without the prior permission of Inscale.
Inscale reserves the right to make changes to the technology, features, specifications and design of
the equipment without notice.
All information contained within this publication was to the best of our knowledge timely, complete and accurate
when issued. However, we are not responsible for misimpressions which may result form the reading of this
material.
The latest version of this publication can be found on our Website.
.
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