SCIENTECH® Zeta Series Electronic Balance Setup and Operating Procedures PN11533D
Thank you for choosing a Scientech Zeta Series Electronic Balance. Scientech, an ISO9001 registered company, and its employees are pleased to provide you with a balance designed and manufactured for years of reliable service and proudly made in the U.S.A. The attractive quality of Scientech balances has been demonstrated by being certified to carry the “CE” mark of conformity. Please read this manual completely before using your balance.
Unpacking and Setup: The balance, weighing pans, remote power supply and windscreen (standard on some models) are packed in a foam support to protect them from shock during shipping and handling. Save and reuse all packing material for future damage-free shipments. Figure 1 Balance Full View Choose the Proper Environment: The environment in which your balance is used is very important. Air movement, temperature changes, vibrations, direct sunlight, etc.
Level the Balance: Adjust (turn) the front feet (see Figure 2) to level the balance by centering the bubble in the level indicator which is shown in Figure 1. Turning the foot as shown below raises that side of the balance and an opposite adjustment lowers it. When properly adjusted the metal center shaft of the assembly will protrude from the center of the plastic foot and will support the balance.
Good Measurement Practices: (As quoted from the Mass Standards Handbook by Troemner, 3-015BKT rev 1/03) There are numerous steps that one can take in order to improve the quality of a mass measurement system. However, they usually fall within three main categories: the equipment, the environment, and the operator. If even one of these areas is neglected, it can have a dramatic negative impact on your results.
Front Panel Controls: Figure 4 Balance Front Panel Note: The annunciators CNV, σ and X are shown in Figure 4, but are not available through any front panel controls. However, these functions along with all other front panel functions are available through RS-232 commands. These commands are discussed later in the RS-232 section of the manual. The ON/OFF (I/O) Button: The ON/OFF button is located in the upper left corner of the balance’s front panel.
The MODE Button: Pressing the MODE button starts the unit of weight cycle as follows: grams(g), carats(ct), pennyweights(dwt), troy ounces(ozt), ounces(oz), pounds(lb), kilograms(kg) and milligrams(mg). When the desired unit of weight appears, press the MODE button a second time to select that unit of weight. An optional, factory installed, user specified, custom unit of measure is available.
Linearity (CAL 2): Linearity is set in the balance’s software at the factory during the manufacturing process. It requires a special set of weights that are not available commercially. When a CAL 1 function is performed the linearity is automatically reset as well. Unless the balance is damaged the linearity will not change. Therefore, CAL 2 should never be performed by the user.
Checkweighing / Process Control Limits (HI OK LO): 7 User Action Press the FUNCTION button (or MODE and RANGE buttons simultaneously for dual range models). Press the MODE button when HI OK LO appears on the display. Press the ZERO button. Place weight on the weighing pan which represents the upper control limit of the acceptable weight range. Press the ZERO button. Remove the upper limit weight and place weight on the weighing pan which represents the lower control limit of the acceptable weight range.
Floating Tare™ (dual range models only): Floating tare is only active when the balance is in LO range. Floating tare yields low range resolution throughout the entire high range capacity of the balance. A typical example using floating tare would be where you combine different components by weight to produce compounds. The procedure is as follows: 1. Select LO range by pressing the RANGE button until LO briefly appears in the display. 2. Place container on weighing pan.
Density Determination: Scientech does not offer a density determination kit nor do you need one to determine density. Density is mass (grams) per unit volume (cubic centimeters). In order to determine density of a solid, place a graduated flask with a known volume of water on the pan of the balance, zero the balance, and then place the solid in the flask of water. Divide the displayed weight in grams by the increased volume of water. The result is the mass per unit volume of the solid in g/cc.
RS-232 Specifications: Type Method Format Note: EIA-RS-232C, DTE Half-duplex, Asynchronous Transmission, Bi-directional 300, 600, 1200, 2400, 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 7, Stop bit 2. Parity none, Data bit 8, Stop bit 1 does function, but is not technically correct.
7 8 9 10 11 User Action AUTO SEND SELECTION (AS oFF is default). “AS on” means the balance will automatically send the display contents over the RS-232 interface at the selected time interval placed into register 89. This time interval may be inputted via the optional PDA or through Type 4 RS-232 commands. Refer to these sections for instructions. A time and date stamp may also be sent at the same time (see Type 4 RS-232 Commands section).
Where a balance response is given, no attempt has been made to show the actual message formats. You should refer to the section on balance message formats for detailed information. Numbers stored in the registers are classified by the balance software as being additive, multiplicative, or unflagged. Additive numbers are used by the balance software in addition and subtraction operations. Multiplicative numbers are used in multiplication and division operations.
Command [Decimal number]_ENTER_[integer] _PIECES[CR] Response None [register number]_RCL_[(CONVERT) (CAL) (PIECES)][CR] TAVG[CR] RESET_TAVG[CR] REG XXX :[register contents][MULT.
Type 3 Commands – Balance Output Functions: Command SEND[CR] [register number]_RCL[CR] Response See the RS-232 Balance Message Formats section. REG XXX:[register contents][current units or 'MULT.'] [CR] [LF] RCL_TARE[CR] REG 091:[TARE register contents] [current units][CR][LR] REG XXX:[contents of specified register][MULT.
RS-232 Balance Message Formats: The balance will respond to a SEND command by transmitting a message in one of three formats depending on how the SEND command was issued. The following discussion defines four types of SEND commands and the three message formats. 1. 2. 3. 4. The first case typically applies to a balance with RS-232 connected to a printer and an external print switch.
Format B - Balance in normal weighing mode: 1 15 X _ 2 16 X Y 3 17 X Y 4 5 6 7 8 9 10 11 12 13 14 X X ...CR LF X X _ _ _ Y Y Y _ Display shows 5.15 g and balance in high range Message is _ _ _5.
Troubleshooting Guide: Problem The display is blank Possible Cause • Balance not turned on • Power cable not plugged in • No power from AC outlet OL appears in display • Maximum capacity exceeded UL appears in display • • • • Pan is not in place Balance is out of range Drafts (air currents are present) Vibrations are present • • • The display is unstable Weight readings are incorrect Possible Solution • Press ON/OFF switch • Plug in cable • Turn on circuit breaker • Change AC outlets • Reduce cont
Specifications for Zeta Series Balances: Model ZSA80 Weighing Mode Capacity (grams) Linearity (grams) Stabilization Time Weighing Speed Display Update Interval (ms) Date Interface Weighing Pan Size Operating Temperature Relative Humidity Power Supply Windscreen Calibration Weight (grams) Housing Weight (pounds) ZSA210 Single Range 80 Readability (grams) Tare Range (grams) Repeatability (grams) (standard deviation) ZSA120 120 210 0.0001 0-80 0-120 0.00015 ±0.
Limited Warranty: All Scientech Zeta Series Electronic Balances and their accessories are warranted against defects in materials and workmanship within North America for five (5) years and all other areas for two (2) years from the date of delivery. During the warranty period, Scientech will repair, or at its option replace at no charge, components that prove to be defective. The equipment must be returned, shipping prepaid, to Scientech's product service facility.
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Quick Setup Guide: 1 UNPACK BALANCE 3 LEVEL BALANCE Adjust the FRONT FEET to level the balance by centering the LEVEL INDICATOR. Thumbwheel turns but stays in the same position against bottom of case. The shaft moves in and out but does not rotate. 5 TURN ON BALANCE Press the ON/OFF switch and make sure the balance goes through the following sequence. Rotating thumbwheel('s) as shown causes Shaft to extend out of case and RAISES front of balance.
