ScienTECH Zeta ZSM50 Installation manual

Electronic Balance
Setup and Operating Instructions
PN 12222 REV-D

2
Table of Contents
Unpacking and Setup .............................................................................................. 3
Choose the proper environ ent ....................................................................... 4
Level the balance ............................................................................................. 4
Unlock shipping stop ....................................................................................... 4
Connect to an electrical outlet .......................................................................... 5
Turn the balance on .......................................................................................... 5
Good easure ent practice .................................................................................... 5
Equip ent ........................................................................................................ 6
Environ ent ..................................................................................................... 6
Operator ........................................................................................................... 6
Front panel controls ................................................................................................. 7
On/Off .............................................................................................................. 7
Range/Function ................................................................................................ 7
Single Range balances................................................................................ 7
Dual Range balances .................................................................................. 8
Mode ................................................................................................................ 8
Send ................................................................................................................. 8
Zero .................................................................................................................. 8
Balance functions and features ................................................................................ 9
Autocalibration—To calibrate to an external weight ....................................... 9
Autocalibration—To calibrate to an internal weight ...................................... 10
Autocalibration—To calibrate internal weight to external weight ................. 10
RS-232 Co and for Autocalibration ......................................................... 11
(Cal 2) Linearity ............................................................................................. 11
(PCS) Front Panel Parts Counting .................................................................. 12
Parts counting over the RS-232 port ......................................................... 12
(HI-OK-LO) Check weighing / Process Control Li its ................................ 13
Check weighing over the RS-232 port ...................................................... 13
(%) Percent Weighing .................................................................................... 14
Percent Weighing over the RS-232 port .................................................. 14
(T) Live Ani al Weighing / Severe Environ ent weighing ........................ 14
Live Ani al Weighing over the RS-232 port .......................................... 15
Floating Tare (Dual Range Balances) ............................................................ 15
Capacity Tracker ............................................................................................ 15
Selectable Filters ............................................................................................ 16
Density Deter ination ................................................................................... 16
Below Balance Weighing .............................................................................. 16
Specific Gravity Deter ination ..................................................................... 17
Security Bracket ............................................................................................. 17
Options .................................................................................................................. 17
RS-232 Interface ................................................................................................... 18
RS-232 Specifications .................................................................................... 18
RS-232 Front Panel Configuration ................................................................. 18
USB ................................................................................................................ 19
Type 1 Co ands– Balance Control Functions ....................................... 19-21
Troubleshooting .................................................................................................... 22
Specifications ................................................................................................... 23-28
Warranty................................................................................................................ 29
Returned Goods ..................................................................................................... 29
Disposal of Electronic Equip ent ......................................................................... 29

3
Unpacking and Setup:
The balance, weighing pans, re ote power supply, windscreen (standard on so e odels) and any op-
tional accessories are packed in a foa support to protect the fro shock during shipping and han-
dling. Save and reuse all packing aterial for future da age-free ship ents.

4
Choose the Proper Environment:
The environ ent in which your balance is used is very i portant. Air ove ent, te perature changes, vibra-
tions, direct sunlight, etc. influences the perfor ance of high precision balances. Therefore, place your balance
on a solid, sturdy surface that is free of air currents, vibration and not in direct sunlight. The surface should not
be agnetic and should be located away fro doors, windows, heaters, air conditioners and fans.
Level the Balance:
Adjust (turn) the thu bwheel (see Figure 2) to level
the balance by centering the bubble in the level indi-
cator which is shown in Figure 1. Turning the
thu bwheel as shown below raises that side of the
balance and an opposite adjust ent lowers it. When
properly adjusted the etal center shaft of the as-
se bly will protrude fro the center of the plastic
thu bwheel and will support the balance. The plas-
tic thu bwheel will be raised up against the botto
of the balance and will not be touching the weighing
table.
Unlock the Clamping Screw:
(Series 1 000 Models Only)
All balances are equipped with a special clamp-
ing screw that locks the balance suspension dur-
ing shipping. This screw must be loosened before
the balance can be operated (see Figure 3).
1. Locate the black knob, on the front center
of the balance, underneath the display area.
2. Re ove the paper tag.
3. Turn the knob, in the direction shown be-
low, until finger tight.
If the balance is ever shipped or moved long
distances, the clamping screw should be retight-
ened by turning the knob in the opposite direc-
tion until finger tight.

5
Connect to an Electrical Outlet:
The balance is supplied with a 100/240, 50/60 Hz auto atic switching, re ote power supply. This power
supply will work with ost electrical outlets. However, before aking any connections, verify that the
power (VAC) require ent shown on the re ote power supply is co patible with the AC power outlet to
which the balance will be connected.
Note: First plug the round .5mm connector into the balance’s rear panel receptacle. Then, plug
the power supply into a grounded AC outlet.
Note: Scientech recommends that the balance be plugged into an electrical outlet at all times.
This insures the balance is always warmed up and ready for use.
Turn the balance on:
Press the ON/OFF button one ti e to turn the balance on and observe the following turn on sequence.
Allow the balance to
warm up for at least 1
hour.
Good Measurement Pracces:
(As quoted fro the Mass Standards Handbook by Troe ner, 3-015BKT rev 1/03)
There are nu erous steps that one can take in order to i prove the quality of a ass easure ent
syste . However, they usually fall within three ain categories: the equip ent, the environ ent, and
the operator. If even one of these areas is neglected, it can have a dra atic negative i pact on your
results. Although these suggestions are not eant to be all enco passing or all-inclusive, the i -
prove ents that can be ade following these si ple guidelines are extraordinary.

6
Equipment:
1. Select weights that have a tolerance that is one third or better than the accuracy you require for your
application. This way the error of the weight will not dra atically i pact the quality of your
easure ents.
2. The equip ent ust be of sufficient readability to calibrate or easure the weight or sa ple
under test.
3. The balance should be placed on a stable platfor free fro the effects of vibration. The ost
co on type of setup involves placing the instru ent onto a balance table that is constructed
of arble or granite.
4. Never use a balance or scale as soon as it is turned on (plugged in). The internal electronic
co ponents need to stabilize and “war up” for at least 24 hours once the equip ent has been
energized. Troe ner reco ends that you leave this instru ent plugged in twenty four hours a
day, seven days a week.
5. Never use a balance that has been idle for several hours without first "exercising it" and calibrating
it. A balance is exercised by repeatedly placing and re oving weights fro the balance pan.
We reco end that this be done at least ten ti es each with a weight that is 100% of the ax
capacity of the balance. After exercising, the balance should be calibrated. If these two techniques
are consistently e ployed, a noticeable i prove ent will result in both linearity and stability of
the easure ent.
7. When weights are not in use, store the in the case in which they were supplied. If the weights were
not supplied with a case, either purchase a case or use a clean container to protect the surfaces. This
will keep airborne particles fro getting on your weights between uses. Weights should be in
ther al equilibriu with the balance so store weights near your balance. Another option is to leave
calibration asses co only used inside the weighing cha ber when not in use. This assures your
weights are in ther al equilibriu with the balance producing a better easure ent.
Environment:
1. The ore stable your environ ent, the better your easure ent results. Changes in te perature, pres-
sure, and hu idity affect balance perfor ance and weight stability. Ideal roo conditions are 20º C
with a relative hu idity between 45% and 60%. Fluctuations in te perature should not exceed 1º C
per hour. Hu idity fluctuations should not exceed 10% per hour.
2. Balances should not be placed in close proxi ity to anything that shakes, vibrates, or stirs violently.
Avoid placing your equip ent near centrifuges, vortexers, or shakers.
3. Do not place your balance and/or scale near anything that generates heat. Heat will cause the balance
cha ber to war and due to the effects of the ther al expansion introduce large errors into your
easure ent. Do not place the balance near a window. Sunlight can penetrate the window, war the
balance cha ber at different rates during the day, and affect the quality of your work.
4. Avoid placing the balance near sources of drafts, extre e air currents, or near air-conditioning vents.
These positions can cause your readings to be unstable and can dra atically cool the balance cha -
ber when the air-conditioning syste begins to run.
5. The easure ent environ ent should be clean and free of excessive conta inants. Conta inants
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 conta inants fro your hand will be transferred
to the weight and introduce a significant error. It is reco ended that all weights be anipulated with
gloved hands or forceps. The two types of gloves that are co only used and accepted are either la-
tex (powderless) or cotton. Avoid any etal to etal contact when handling or storing weights. This
will cause scratches that ay introduce error. All weight forceps and weight lifters should be either
non etallic (plastic or wood) or if etal, covered with a soft protective coating or aterial to avoid
scratches.

7
2. Place the weight or sa ple near the center of the balance pan. A s all offset fro center can have a pro-
nounced effect and introduce undue variation.
3. Take special care not to breathe onto the weight or into the balance cha ber. Back away fro the instru-
ent. This will prevent any ther al transfer of heat fro your breath or body to the balance, the weight,
or the sa ple.
4. Ti e your easure ents. Consistent sa ple ti es will provide ore consistent easure ent.
Front Panel Controls:
The ON/OFF (I/O) 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 auto atic syste s checkout to insure it is functioning properly.
If your balance was purchased with the optional otorized internal calibration weight it will have a suffix of IW
after the odel nu ber. All objects on the stainless steel pan ust be re oved 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. For internal weight (-IW) odels, the balance will then load the internal weight on and off the weigh-
ing 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 otor is silent before zeroing the balance and starting
weighing operations.
When the balance is on, pressing the ON/OFF button will turn off the display.
The RANGE/FUNCTION Button:
Single Range Balance Models:
Pressing the RANGE/FUNCTION button begins the following enus cycle:
• PCS – Front panel parts counting
• HI OK LO – Checkweighing
• CAL 1 – Autocalibration
• CAL 2 – Linearity
• – Live ani al weighing
• % - percent weighing
To select the desired function, press the MODE button when it appears on the display.
The annunciators CAL,CNV, σ
and are shown in but are not
available through any front panel
controls. However, these functions
along with all other front panel
functions are available through
RS- 3 commands. These com-
mands are discussed later in the
RS- 3 section of the manual.

8
Dual Range Balance Models:
Pressing the RANGE/FUNCTION button allows you to choose fro low (LO), high (HI) and autorange (HI
LO). As a range is selected its annunciator briefly appears at the upper right of the display. Autorange auto-
atically switches fro low range to high range when a weighing exceeds the capacity of the low range.
Note: On dual range balance models, pressing the RANGE/FUNCTION and MODE buttons simulta-
neously will duplicate the menu described for single range balances.
The MODE Button:
For all odels, pressing the MODE button starts the unit of weight cycle as follows: gra s(g), carats(ct), pen-
nyweights(dwt), troy ounces(ozt), ounces(oz), pounds(lb), kilogra s(kg) and illigra s( g). When the de-
sired unit of weight appears, press the MODE button a second ti e to select that unit of weight.
An optional, factory installed, user specified, custo unit of easure is available. If you have this special unit
of easure feature in your balance, (A) appears in the unit of weight cycle in addition to the other options.
Press the MODE button to select this option.
The SEND Button:
Pressing the SEND button sends the infor ation on the balance’s display to an external device via the RS-232
interface.
Note: Scientech balances are DTE (computer) devices. If communicating to another DTE device (ie
computer), a Scientech RS- 3 cable, PN10697, or normal null modem cable is required. If you
are communicating to a DCE device (printer), a serial cable is required. Scientech offers a serial
cable, PN11367, for your convenience.
You ay send the ti e and date along with the weight reading when you press the SEND button or you ay
send weight readings auto atically at user specified ti e periods (see the Bi-directional RS-232 Co and Set,
for details). Weight readings ay also be sent to a co puter or printer continuously every 200 illiseconds
(see the RS-232 Front Panel Configuration section for details). Weight readings ay be sent auto atically
when the balance reaches stability (see Selectable Filters section).
The ZERO Buttons:
There are two (2) ZERO buttons. Pressing either button at any ti e returns the display to zeros. When a weigh-
ing that has been zeroed out is re oved fro the weighing pan, a negative reading is displayed. To return the
display to zeros, press one of the ZERO buttons.

9
Balance Funcons and Features:
Autocalibration – To Calibrate the balance to an External Weight:
This procedure calibrates your balance to an external calibration weight. If your balance has a otorized inter-
nal calibration weight it will have a suffix of IW after the odel nu ber. Please use the procedure for Autocali-
bration to calibrate the balance to a Motorized Internal Calibration Weight.
Note: Dual range models must be placed in HI range before starting the calibration procedure.
Note: For correct calibration weight refer to specification charts in the back of the manual.
Note: The balance should be warmed up for at least one (1) hour prior to calibration and leveled ac-
cording to the Unpacking and Setup section.
Note: Perform autocalibration every time you move your balance.
Calibrate the balance using a recently certified external calibration weight. Metrology handbooks state that the
calibration weight utilized to calibrate a balance should have a tolerance no larger than the readability of the
balance divided by 3. Therefore, SA/ZSA odels need a ±0.033 g tolerance weight or better, SP/ZSP odels
need a ±0.33 g tolerance weight or better, SL/ZSL odels need a ±3.3 g tolerance weight or better, and SG
odels need a ±33 g tolerance weight or better. In addition, these sa e handbooks reco end that all bal-
ances be calibrated using an external certified calibration weight even if the balance has an internal calibration
weight.
User Action Balance Response
1 Re ove any containers or weighing sa ples so
that nothing is on the weighing pan, then press the
ZERO button
Zeros are displayed
2 Press the RANGE/FUNCTION button (or MODE
and RANGE buttons si ultaneously for dual
range balance odels)
Balance display cycles repeatedly through PCS,
HI OK LO, CAL 1, CAL 2, and %.
3 Press the MODE button when CAL 1 appears CAL 1 and a flashing 0 are displayed.
4 Wait 10 seconds for the balance to stabilize, then
press the ZERO button.
The display stops flashing, CAL 1 and a solid 0
are displayed. In approxi ately 15 seconds, when
this step is co plete, a single weight or two alter-
nating weights will begin flashing on the display.
5 Place one of the flashing weights on the balance’s
weighing pan.
The display stops flashing, CAL 1 and the select-
ed weight are displayed.
6 Do not remove the weight from the pan. The display will o entarily blink, then the select-
ed weight will continue to be displayed. In approx-
i ately 15 seconds, when this step is co plete, the
display will blank, flash “OK”, then display the
calibration weight including deci al places. The
balance is now calibrated and in the nor al weigh-
ing ode. For balances with an internal weight
press MODE to co plete this step. This will not
change the internal weight calibration factor.
7 Re ove the calibration weight. The display returns to zeros.

10
Autocalibration – To Calibrate the Balance to a Motorized Internal
Weight:
This procedure is only for balances with the suffix IW after the odel nu ber which eans a otorized inter-
nal calibration weight is installed.
Note: Dual range models must be placed in HI range before starting the calibration procedure.
Note: For correct calibration weight refer to specification charts in the back of the manual.
Note: The balance should be warmed up for at least one (1) hour prior to calibration and leveled ac-
cording to the Unpacking and Setup section.
User Action Balance Response
1 Re ove any containers or weighing sa ples so
that nothing is on the stainless steel pan. Then
press the ZERO button.
Zeros are displayed.
2 Press the FUNCTION button (or MODE and
RANGE buttons si ultaneously for dual range
odels).
Display cycles repeatedly through PCS, HI-OK-
LO, CAL1, CAL2, , and %.
3 Press the MODE button when CAL1 appears. CAL1 and a flashing 0 are displayed.
4 Wait 10 seconds. Then press the MODE button. The display shows a flashing CAL. This eans
that the auto atic calibration procedure using the
internal weight has begun. IntLOAd will appear in
the display. The procedure will take about 30 to 90
seconds. When the procedure is co plete, the dis-
play will blank and then return to its nor al
weighing ode. This eans that your balance is
now calibrated. If the calibration cannot be co -
pleted due to air currents, an unstable environ ent
(vibration), an incorrect weight, or any other rea-
son; a brief “ERR” essage will appear on the
display and the balance will return to Step 3.
Autocalibration – To Calibrate the Balance and its Motorized Internal
Calibration Weight to an External Weight:
This procedure is only for balances with the suffix IW after the odel nu ber, which eans a otorized inter-
nal calibration weight is installed. This procedure first calibrates the balance to an external calibration weight
then recalibrates the internal calibration weight to the external weight. This procedure can also be used to only
calibrate the balance to the external weight without recalibrating the internal calibration weight.
Note: Dual range models must be placed in HI range before starting the calibration procedure.
Note: For correct calibration weight refer to specification charts in the back of the manual.
Note: The balance should be warmed up for at least one (1) hour prior to calibration and leveled ac-
cording to the Unpacking and Setup section.
Note: Perform autocalibration every time you move your balance.
Calibrate the balance using a recently certified external calibration weight. Metrology handbooks state that the
calibration weight utilized to calibrate a balance should have a tolerance no larger than the readability of the
balance divided by 3. Therefore, SA odels need a ±0.033 g tolerance weight or better.

11
User Action Balance Response
1 Re ove any containers or weighing sa ples so
that nothing is on the weighing pan. Then press
the ZERO button
Zeros are displayed
2 Press the RANGE/FUNCTION button (or
MODE and RANGE buttons si ultaneously for
dual range balance odels)
Balance display cycles repeatedly through PCS,
HI OK LO, CAL 1, CAL 2, and %.
3 Press the MODE button when CAL 1 appears CAL 1 and a flashing 0 are displayed.
4 Wait 10 seconds for the balance to stabilize, then
press the ZERO button.
The display stops flashing, CAL 1 and a solid 0
are displayed. In approxi ately 15 seconds,
when this step is co plete, a single weight or
two alternating weights will begin flashing on
the display.
5 Place one of the flashing weights on the bal-
ance’s weighing pan.
The display stops flashing and the selected
weight is displayed.
6 Do not remove the weight from the pan. The display will o entarily blink, then the se-
lected weight will continue to be displayed. In
approxi ately 15 seconds, when this step is co -
plete, the display will blank, flash “OK”, then
shows CAL 1 and a flashing 0.
7 To continue and recalibrate the internal calibra-
tion weight, proceed to step 8.
To stop here without calibrating the internal cali-
bration weight, re ove the calibration weight
fro the weighing pan and press the MODE
button.
The balance has been calibrated and the display
returns to zeros.
8 Re ove the calibration weight fro the weigh-
ing pan, then press the ZERO button.
The display shows a flashing CAL and the inter-
nal weight recalibration begins. IntLOAd will
appear in the display. You will hear the internal
otor and see the capacity tracker fill and then
e pty. The procedure will take about 30 to 90
seconds. When co plete, the display will blank
and then return to its nor al weighing ode. The
balance is now calibrated to the external weight
and the internal weight is calibrated to the exter-
nal calibration weight.
RS- 3 Command for Autocalibration:
To initiate a CAL 1 using the otor driven internal calibration weight via a RS-232 co and, issue the co -
and ACAL[CR]. The auto atic internal weight calibration will begin i ediately without further user inter-
action. For a ore co plete discussion about RS-232, please see the Bi-directional RS-232 Co and Set
section.
(CAL ) Linearity:
Linearity is set in the balance’s software at the factory during the anufacturing process. It requires a special
set of weights that are not available co ercially. When a CAL 1 function is perfor ed the linearity is auto-
atically reset as well. Unless the balance is da aged the linearity will not change. Therefore, CAL 2 should
never be perfor ed by the user.

12
(PCS) Front Panel Parts Counting:
The minimum single piece weight for
(Z)SA model balance is 0.001 g
(Z)SP model balance is 0.01 g
(Z)SL model balance is 0.1 g
SG model balance is 1.0 g
User Action Balance Response
1 Press the FUNCTION button (or MODE and
RANGE buttons si ultaneously for dual range
odels).
Display cycles repeatedly through PCS, HI-OK-
LO, CAL1, CAL2, , and %.
2 Press the MODE button when PCS appears on
the display.
PCS and 0 flash. This is a pro pt to zero the
balance with the container that will hold the piec-
es on the weighing pan.
3 Place the e pty container on the pan, wait 10
seconds, and then press the ZERO button.
PCS and 10 flash. This is a pro pt to place 10
pieces in the container.
4 Place 10 pieces in the container, wait 10 seconds,
and then press the ZERO button.
PCS continues to flash and OK appears on the
display while a stable weight is obtained. Then
10.0, or so ething very near it, appears on the
display. The nu ber of deci al places depends
on the weight. PCS continues to flash. This
pro pts you that you ay now increase the sa -
ple size in order to obtain a ore statistical sig-
nificant sa ple which yields a ore accurate
parts counting conversion factor. The deci al
places aid you in rounding the piece count cor-
rectly as the sa ple size increases.
5 If you want a larger sa ple size to be used in
co puting the parts counting conversion factor,
add pieces (the balance will count the ) until the
deci al part is near 0.7 or 0.3. Then press the
ZERO button.
The balance will round to the nearest whole
nu ber but still show the deci al places. This
step ay be repeated as any ti es as you de-
sire.
6 When you are satisfied the sa ple size is large
enough, press the ZERO button once again.
The balance rounds to the nearest whole nu ber,
the deci al places disappear, and PCS lights
steadily.
7 When you wish to count so ething else, press
the MODE button.
You are now back at Step 2 with a flashing PCS
and 0.
8 If you want to exit the counting ode, press the
MODE button again.
You are now in the weighing ode you used just
before selecting the parts counting ode.
Parts Counting over the RS- 3 port.
Parts counting is also available fro the I/O using the SETPIECES <No. of pieces> <Total ass of pieces>
co and.
Exa ple:
SETPIECES 35 0.756[CR] Note the space between SETPIECES, 35 and 0.756
The balance responds with 0.0216 g / PIECE (The individual part weight) and has entered parts counting ode.
Placing parts on pan will display the total nu ber of pieces.

13
(HI-OK-LO) Check weighing / Process Control Limits:
User Action Balance Response
1 Press the FUNCTION button (or MODE and
RANGE buttons si ultaneously for dual range
odels).
Display cycles repeatedly through PCS, HI-OK-
LO, CAL1, CAL2, , and %.
2 Press the MODE button when HI OK LO appears
on the display.
HI, LO and 0 flash.
3 Press the ZERO button. HI flashes and zero is displayed.
4 Place weight on the weighing pan which represents
the upper control li it of the acceptable weight
range.
HI flashes and the upper weight li it is displayed.
5 Press the ZERO button. LO flashes and the upper weight li it is displayed.
6 Re ove the upper li it weight and place weight
on the weighing pan which represents the lower
control li it of the acceptable weight range.
LO flashes and the lower weight li it is displayed.
7 Press the ZERO button. HI OK LO briefly appears and then OK and the
lower weight li it are displayed.
8 Re ove the lower li it weight. LO appears and zeros are displayed.
The balance is now ready to check weigh sa ples. The balance displays OK along with the weight of the sa ple
if the sa ple is within the acceptable weight range. If the sa ple is too heavy, HI and the weight are displayed. If
the sa ple is too light, LO and the weight are displayed. The weight li its are stored until the balance is turned
off.
To exit check weighing, press the MODE button. The balance then returns to nor al operation.
Check weighing over the RS- 3 port.
Check weighing is also available fro the I/O using the SETCHKWGT <high li it> <low li it> co and.
Exa ple:
SETCHKWGT 137.556 135.2 ↵
places the balance in check weighing ode with the high li it set to 137.556 and the low li it set to 135.2
Note there is a space between SETCHKWGT and 137.556 and another space between 137.556 and 135.2
SETCHKWGT uses the current unit of easure. If the balance is in gra s the <high li it> <low li it> nu -
bers are expressed in gra s as well.

14
( ) Live Animal Weighing / Severe Environment Weighing:
User Action Balance Response
1 Press the FUNCTION button (or MODE and
RANGE buttons si ultaneously for dual range
odels).
Display cycles repeatedly through PCS, HI-
OK-LO, CAL1, CAL2, , and %.
2
Press the MODE button when appears on
the display.
appears in the display and you are now in
the ti e averaging weighing ode.
3 Place a container/cage on the pan.
appears in the display as well as a slowly
increasing weight of the container/cage.
4 Wait 5 seconds or until the OK is displayed
and press the RANGE/FUNCTION button . appears in the display and the container/
cage weight.
5 Press the ZERO button and re ove the con-
tainer/cage.
A slowly decreasing negative weight is dis-
played.
(%) Percent Weighing:
User Action Balance Response
1 Place an e pty container on the weighing pan
and press the ZERO button.
Zeros are displayed.
2 Place the sa ple which represents 100% in the
weighing container.
Display indicates the weight of the sa ple in the
unit of easure you have selected.
3 Press the FUNCTION button (or MODE and
RANGE buttons si ultaneously for dual range
odels).
Display cycles repeatedly through PCS, HI-OK-
LO, CAL1, CAL2, , and %.
4 Press the MODE button when % appears on the
display.
Display will indicate % and 100.001. This eans
that the weight on the pan now represents
100.00%. You are now in the percent weighing
ode with all weight readings displayed as a
percentage of the weight of the sa ple used in
Step 2.
5 If you want to exit the percent weighing ode,
press the MODE button.
You are now in the weighing ode you used just
before selecting percent weighing.
Note 1. Displays three deci al places for weights above ½ capacity of the balance.
Displays two deci al places for weights below ½ capacity.
Displays one deci al place for weights below 5% capacity.
Displays Err below 1% capacity.
Percent Weighing over the RS- 3 port
Percent weighing is also available fro the I/O using the SETPERCENT <%> co and.
Exa ple:
SETPERCENT 60 ↵

15
User Action Balance Response
6 Replace the container/cage with the enclosed
sa ple/ani al on the weighing pan.
Wait 5 seconds and then press the RANGE/
FUNCTION button. The ti e averaging ay
require several ore seconds to reach a final
value.
8 If you want to exit the ti e averaging weighing
ode, press the MODE switch.
You are now in the weighing ode you used just
before selecting the ti e averaging ode.
Live Animal Weighing over the RS- 3 port
Exa ple:
TAVG↵ Enter Ti e Averaging .
CLEAR↵ Exit Ti e Averaging .
Floating Tare™ (dual range models only):
Floating tare is only active when the balance is in LO range. Floating tare yields low range resolution through-
out the entire high range capacity of the balance. A typical exa ple using floating tare would be where you
co bine different co ponents by weight to produce co pounds. The procedure is as follows.
Select LO range by pressing the RANGE button until LO briefly appears in the display.
Place container on weighing pan. If the container weight exceeds LO range capacity, OL is displayed. If the
container weight does not exceed the LO range capacity, the container weight is displayed.
Press the ZERO button. The display returns to zeros and LO range.
Add the first co ponent until the target weight is reached. Then press ZERO.
Add the second co ponent until the target weight is reached. Then press ZERO.
Continue until all co ponents have been added.
Floating tare allows you to enter the LO range fro anywhere within the full capacity range of the balance.
This feature is particularly useful when adding s all a ounts to large tare loads and co pounding where
weights are accu ulated. Floating tare is only active when the balance is in LO range. Pressing the ZERO but-
ton returns the display to zeros in LO range. While you are using the floating tare feature, it is easy to lose track
on how uch capacity has been used. For this reason the Capacity Tracking feature is a helpful tool. Please see
the discussion under that heading.
Capacity Tracker:
The capacity tracker provides a graphic display of the used and unused portions of the weighing range and is
shown in Figures 4 and 5. Each seg ent represents 10% of the balance's total capacity. As 10% of the bal-
ance’s capacity is used the first seg ent will illu inate. As 20% of the balance’s capacity is reached the sec-
ond seg ent will light and so on.

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Selectable Filters:
All balances are equipped with three user-selectable vibration filters which reduce nervous readings in varying
weighing conditions. The balance was delivered to you set in the low filtering ode (Fil Lo). This is the least
aggressive filtering ode. Nor al filtering (Fil nor) and high filtering (Fil HI) can be selected for noisier con-
ditions and faster response.
The stability indicator, OK, is illu inated when the variance of the readings are below the preset stability pa-
ra eters as selected by the user. The stability indicator is useful in deter ining the stability of the weighing
environ ent. In nor al weighing the OK stability indicator should co e on within five seconds after the sa -
ple has been placed on the pan and the windscreen is closed. If the stability indicator does not co e on or takes
a very long ti e this indicates it is too noisy of an environ ent for that level. Try i proving the environ ent
or raise the filter level to enter the selection ode proceed as follows: To exit the selection ode and return to
nor al operation, turn the balance off and then back on again at any ti e.
User Action Balance Response
1 Press ON/OFF and MODE/UNITS
si ultaneously.
The current filter, Fil nor (filtering nor al), Fil
Lo (filtering low), or Fil HI (filtering high) and
OK are displayed.
2 Press the SEND button until the desired vibra-
tion filter is displayed. Then press the RANGE/
FUNCTION button to save the setting.
Balance shows SAVED and returns to nor al
weighing. The balance will re ain in the cho-
sen filter setting even if turned off and back on
Density Determination:
Scientech does not offer a density deter ination kit nor do you need one to deter ine density. Density is ass
(gra s) per unit volu e (cubic centi eters).
In order to deter ine density of a solid, place a graduated flask with a known volu e of water on the pan of
the balance, tare the balance, and then place the solid in the flask of water. Divide the displayed weight in
gra s by the increased volu e of water. The result is the ass per unit volu e of the solid in g/cc.
To deter ine the density of a liquid, place an e pty graduated flask on the balance weighing pan, tare the bal-
ance, then pour the liquid into the graduated flask. Divide the displayed weight in gra s by the volu e of the
liquid. The result is the ass per unit volu e of the liquid in g/cc.
Below Balance Weighing: Please use care when installing Below Balance
Weighing. The suspension can be damaged if over tightened. The overload
protection which is built into the pan assembly is not available at the below
balance hanging device. Therefore, care must be taken to avoid side shocks
or pulling too hard on the hanging device. When using the below balance
weighing option it is suggested that you calibrate the scale from below.
For applications requiring suspension of weight below the balance, a 6-32 threaded screw is provided. To access
the set screw, proceed as shown. Then ount the balance on a solid pedestal or surface with a hole under the bal-
ance to allow access to the hanger. While using the below balance weighing feature all other functions of the bal-
ance operate nor ally. The balance is capable of weighing both above and below si ultaneously provided the
capacity of the unit is not exceeded.

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Specific Gravity Determination:
The below balance weighing apparatus shown previously is ideal for deter ining specific gravity. Specific
gravity is the ratio of the ass of a body to the ass of an equal volu e of water. Every ineral has its own
specific gravity (SG). A list ay be found in any Handbook of Che istry and Physics. Specific gravity will
classify or authenticate a substance. For instance, a dia ond’s SG is 3.50-3.53 while quartz’s is 2.65.
To deter ine specific gravity using our balance:
1. Install a below balance weighing hangar as shown in the previous section.
2. Install a below balance weighing apparatus, such as a wire hook, including a pan suspended in a bowl of
water. Insure that the pan and the hanger do not touch any part of the bowl and all are totally sub erged.
Then tare the balance.
3. Now place the sa ple to be tested on the balance pan and record the weight reading shown on the display.
You ay use any unit of easure you desire.
4. Place the sa e sa ple to be tested on the pan suspended in the bowl of water. Make sure that the sa ple
is co pletely sub erged in the water and record the weight reading shown on the display.
5. Subtract the reading in Step 4 fro the reading in Step 3.
6. Divide the reading in Step 3 by the nu ber calculated in Step 5. The result is the SG of your sa ple.
EXAMPLE: Reading in Step 3 = 6.50
Reading in Step 4 = 4.25
Subtraction = 2.25
Division (Step 6) = 6.50/2.25= 2.89 specific gravity
Security Bracket:
A security bracket is provided on the rear panel providing a convenient ethod of securing the balance.
Opons:
Below Balance Weighing and Custo Unit of Measure options ust be installed at the Scientech factory.
Other options, such as a Scientech printer, ay be purchased at any ti e.
Please contact Scientech at [phone] or [phone] or e ail us at [e-mail] for infor-
ation.

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RS-2 2 Interface:
Note: Scientech balances are DTE (computer) devices. If communicating to another DTE device (ie
computer), a Scientech RS- 3 cable, PN10697, or normal null modem cable is required. If you
are communicating to a DCE device (printer), a serial cable is required. Scientech offers a serial
cable, PN11367, for your convenience.
Your balance is equipped with a bi-directional RS-232 co patible inter-
face. The RS-232 connector is a 9 pin D sub iniature connector located
on the balance rear panel. The pin out and pin descriptions are shown
here.
RS- 3 Specifications:
Type EIA-RS-232C, DTE
Method Half-duplex, Asynchronous Trans ission, Bi-directional
For at 4800, 9600 and 19,200 baud rate selectable (default is 9600)
Code: ASCII
For parity Even or Odd: Data bit 7, Stop bit 1.
For parity none: Data bit 8, Stop bit 1.
RS- 3 Front Panel Configuration:
Before using the RS-232 feature of your balance, it is necessary to configure the interface properly for your
application. The RS-232 Configuration Mode allows you to set baud rate, auto send, continuous send, send
when stable and display blanking. The balance is configured with defaults at the factory. The default odes are
shown in parenthesis below.
It is not necessary to follow the entire configuration procedure if only one para eter is to be changed. Use step
1 to enter the enu and press MODE/UNITS to scroll through the different para eters. When the desired pa-
ra eter is displayed the SEND key will scroll through the settings for that para eter. Pressing RANGE
/FUNCTION at any ti e will save the settings and return to nor al weighing ode.
To enter the RS-232 configuration ode via the front panel, proceed as follows:
User Action Balance Response
1 Press ON/OFF and SEND si ultaneously. The current baud rate br4800, br9600, or
br19,200 is displayed.
2 Press the SEND button until the desired baud rate
is displayed.
3 Press the MODE/UNITS button. The current parity even, odd or none is displayed.
4 Press the SEND button until the desired parity is
displayed.
5 Press the MODE/UNITS button. Auto send AS ON or AS OFF is displayed
6 Press the SEND button until the desired auto send
ode is displayed.
7 Press the MODE/UNITS button. Continuous send CS ON or CS OFF is displayed

19
8 Press the SEND button until the desired
continuous send ode is displayed.
9 Press the MODE/UNITS button. Send when Stable SS ON or SS OFF is
displayed
10 Press the SEND button until the desired
Send when stable ode is displayed.
11 Press the MODE/UNITS button. Display blinking ode BL ON or BL OFF is
displayed
12 Press the SEND button until the desired
blinking ode is displayed.
13 Press RANGE/FUNCTION button. SAVED is displayed briefly and the scale returns
to nor al weighing ode.
User Action Balance Response
Using Bi-Directional Communications:
Scientech electronic balances, interfaced to a co puter via the RS-232 port, can be controlled by a co puter
progra . Any progra ing language with access to the RS-232 interface can be used to progra this control.
The balance expects ASCII character instruction strings and responds with ASCII character data strings. All
characters with an ASCII value less than the space character (deci al 32 of hex 20), are ignored by the balanc-
es.
USB:
The RS-232 and USB ports share the sa e internal co unication port. All co ands described by the
RS-232 are valid for the USB as well. The balance utilizes a CP-2102 serial bridge architecture. The USB con-
nector is a type B located on the rear panel of the balance.
Type 1 Commands – Balance Control Functions:
The following co ands can be sent to the balance in any co bination of upper and lower case characters.
No action is taken by the balance until it receives a carriage return indicating the end of the co and string.
Type all co ands as shown .
↵ = Carriage return
Command Response Purpose
CLEAR↵ OK Balance in nor al ode Exit any special weighing ode i ediately,
clears statistics . Does not tare balance.
HI_RANGE↵
LO_RANGE↵
AUTO_RANGE↵
Hi Range Selected
Lo Range Selected
Auto Range Selected
Places dual range balances in the desired
range. Co and is ignored on single range
balances
GRAMS↵ OK gra s selected1 Places balance in Gra s.
CARATS↵ OK carats selected1 Places balance in Carats.
DWT↵ OK pennyweight selected1 Places balance in pennyweight.

20
Command Response Purpose
OZT↵ OK troy ounces selected1 Places balance in Troy Ounces.
OZ↵ OK ounces selected1 Places balance in Ounces (advp)
LB↵ OK pounds selected1 Places balance in Pounds.
KG↵ OK kilogra s selected1 Places balance in Kilogra s.
MG↵ OK illigra s selected1 Places balance in illigra s.
A↵ OK A selected2 Places balance in special unit of weight.
TAVG↵ OK Ti e averaging ON Clears the TBAR registers and enters the
TBAR ode.
RESET_TAVG↵ OK Ti e averaging reset Clears the TBAR registers. If the balance is in
the TBAR ode, the process keeps running.
XAVG↵ #N XX.XXX U3 Accu ulates the current weight in the XBAR
registers.
RESET_XAVG↵ None Clears the XBAR registers.
GLP↵ Sends GLP header Puts balance in the GLP ode.
ISO↵ Sends ISO header and waits
for target weight entry
Puts balance in ISO ode.
TARG XX.XXX↵4 XX.XXX g TARGET EN-
TERED
Enter target weight value in gra s.
SEND↵ Sends weight, difference be-
tween weight and target, and
signature line
Ter inates ISO ode.
ASON↵ or ASOFF↵ Output the current weight at
the interval specified by
ASINT
Turns auto send on or off. When auto send is
on, a ti e interval ust be entered. See SETA-
SINT
ASINT n Auto Send Interval n Seconds Sets the auto send interval in Seconds
CSON↵ or CSOFF↵ Output the current weight at
every 200 S
Turns continuous send on or off.
SSON↵ or SSOFF↵ Output the current weight
when the OK annunciator ap-
pear in the display.
Turns send when stable on or off.
READCLOCK↵ Current date and ti e
RCL_XAVG↵ Mean XX.XXX U3
Maxi u XX.XXX U3
Mini u XX.XXX U3
StdDev XX.XXX U3
CV XX.XXXX %
N Integer Sa ples
Sends statistics of sa ples