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

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.