Table of Contents Introduction 3 Section One Installing Your Balance 5 5 Section Two Understanding Your Balance 7 7 Section Three Using Your Balance 9 9 Section Four Advanced Functions 15 15 Appendix I Set-Up Functions 17 17 Appendix II Calibration 20 20 Appendix III Glossary of Terms 21 21 Appendix IV RS-232 Serial Data Communications 22 22 Appendix V Accessories and Options 27 27 Appendix VI In Case of Difficulty 28 28 Appendix VII Specifications 29 29 Appendix VIII Limited Two Yea
Introduction Thank you for purchasing a Setra precision balance. Its ease of operation and durable construction should provide years of reliable service. While your balance is easy to operate, it is advisable to read this guide carefully before use. It is designed to help you perform weighing, formulation by percentage and related operations quickly and accurately. This guide is divided into four major sections.
RS-232 Serial Connector D.C.Connector FIGURE 1. Components and Features of the SETRA balance.
Section One Installing Your Balance SETUP 1. Locating your balance The rugged design of your Setra balance ensures that it will withstand most environmental conditions it might encounter. Nonetheless, you should treat your balance as you would any piece of precision equipment, locating it away from extremes of draft and vibration. 2.
EXPERIMENTATION 1. Display test When your balance is first powered on (connected to an AC outlet or battery), it automatically runs through a “display test,” showing all possible segments which might be displayed. This test lasts approximately six seconds. The balance next says “HELLO” and performs self-diagnostics to ensure proper operation. The balance then counts down to zero, and is ready for use. 2.
Section Two Understanding Your Balance KEYBOARD FUNCTIONS tare % Clears display. Assigns the pan and whatever is currently being weighed a value of zero. Instructs the balance to display percent weight. conv Converts weighing units (for example, changes from grams to ounces). print Sends to a printer or other peripheral device information displayed, along with the sample number, if entered. clear Clears the display and the last number entered or function requested, and displays weight.
DISPLAY SYMBOLS OK Reading on balance is stable. Further operations may be performed. INT Balance is operating in the fast integration mode, for use when filling containers to a target weight, or in the slow integration mode for use when vibration is present. APW Reading given in “aggregate percent weight.” This is the weight equivalent to 100% when using the percent function. PC g Reading shown is given in percent. Reading shown is given in grams.
Section Three Using Your Balance ENTERING A NUMBER OR FUNCTION To enter a number or function on your balance, simply press the key or keys which correspond to the numbers or functions you wish to enter. CLEARING A NUMBER OR FUNCTION To clear the last function or number you entered on the balance’s keyboard, simply press the clear key. This automatically returns your balance to the weighing mode.
Since mass and weight are different measurements, your instrument must be compensated for local gravitational effects in order to determine mass. This calibration should be performed prior to initial use and on a regular basis thereafter. Refer to Appendix II, “Calibration.” Further references to weight in this manual may be assumed to be interchangeable with mass if calibration has been performed.
REDUCED RESOLUTION WEIGHING In the presence of severe vibration or draft a stable display can often be achieved by reducing the displayed resolution. 1. Press the x10 key to reduce displayed reading by one digit. 2. To return to the normal displayed resolution, press the x10 key again. PERCENT DEVIATION To calculate the amount by which a weight varies from a reference, follow this procedure: 1. Press tare. 2. Place the reference weight on the pan. 3. Press the % key.
5. Press the % key. The display now reads in percent. 6. Press the int key to select the fast update rate for filling operations. 7. Add a substance until the desired percentage is reached and the “OK” symbol appears. 8. Press the tare key. 9. Repeat Steps 8 and 9 until all substances have been added. 10. Press clear to return to weighing. 11. Press the int key to return to the normal weighing mode. To display the target weight (or aggregate percent weight), press — then %.
WEIGHING IN THE PRESENCE OF VIBRATION The int key can be used to enter a slow update mode for weighing in the presence of vibration. However, the int key is factory pre-set to provide a rapid update for filling operations. Refer to Appendix I, “Set-Up Functions” to alter the functionality of the int key for a longer integration time. Once altered, follow the procedure below to activate the longer integration time. 1. Press the int key to select the slow update mode. The INT symbol will be displayed. 2.
7. Press the print key on the balance. 8. Repeat Steps 5, 6 and 7 anytime you wish to print out information. NOTE: When using a printer other than the Setra 240P or 340P, set the baud rate on your balance to match the printer (see Appendix I). NOTE: To interpret the meaning of the symbols printed, see Appendix IV - “RS-232 Serial Data Communications.” REPETITIVE PRINTING It is sometimes desirable to measure weight at fixed intervals of time. One use of this procedure is evaporation studies.
Section Four Advanced Functions USER-DEFINABLE UNITS It is often convenient to weigh in user-defined units. This balance has two user-definable units of measure, X and t units. Conversion factors can be entered through the keyboard to be multiplied by the displayed weight, or divisors can be entered to be divided into the displayed weight. X units can be changed by entering a factor or divisor. To measure in X units, proceed as follows: 1. Calculate the ratio you wish to enter.
3. Press the — key. 4. Enter 1732. This is the tamperproof code. 5. Press the cal key. 6. If you are entering a divisor, press —. 7. Enter the conversion ratio. 8. Press the cal key. 9. Place an object to be weighed on the balance. 10. Wait for the “OK” symbol, then read the display. The weight is given in t units. NOTE: X units and t units remain stored in the balance until they are replaced by new units. Both X and t units may be directly converted to new units.
Appendix I Set-Up Functions Changing Display Update Rate (INT Mode) The int key is factory preset to provide a rapid display update (short integration time) for pouring liquids to a target weight. The use of this key can be altered to provide a slow display update (long integration time) for weighing in the presence of vibration. Follow the procedure below to change the functionality of the int key to either a slow or a rapid display update: 1. Press the — key. 2. Enter 11110.
DISABLING TONE Your Setra balance emits a tone when a number or function is entered. To disable the tone, use the following procedure: 1. Press the — key. 2. Enter 9999. This is the tone access code. 3. Press the cal key. The tone is disabled. NOTE: To return the tone to use, repeat Steps 1-3. FIRMWARE VERSION Setra is continually making improvements to its products. As a result the operating software, or firmware, of the scale has a revision number.
2. Press the cal key. The display will read “d-noS”. 3. Press the CAL key. The factory defaults will now be restored. If any error message is displayed during the self-diagnostic test, the balance will emit a prolonged tone. WRITE DOWN THE ERROR MESSAGE. Unplug the balance and plug it back in. The display will read “d-noS”. Run the self-diagnostics again. If the same message appears, call for service. DO NOT ATTEMPT TO REPAIR THE SETRA BALANCE.
Appendix II Calibration Your Setra balance is highly stable, and requires infrequent calibration. While it may be calibrated as often as desired, periodic calibration is adequate for most applications. FULL-SCALE CALIBRATION To calibrate your balance with a full scale mass use the following procedure: 1. Press the clear key. 2. Press the tare key. 3. Place the mass on the pan. 4. Press the cal key.
Appendix III Glossary of Terms ACCURACY The degree of conformity of a measured value to the true value. AGGREGATE PERCENT WEIGHT The weight associated with 100%. The reference weight. BAUD RATE The rate at which the balance transmits or receives data to or from a computer or peripheral device. GROSS WEIGHT The weight of a container and its contents. MASS The quantity of matter in a body as measured by its inertia. Mass is independent of gravity.
Appendix IV RS-232 Serial Data Communications Setra Models 12000L, 5000L, 2000L and 500L come equipped with a bidirectional RS232 interface. Users who have purchased a Setra printer may simply follow the directions under “Printing Out Information.” It may be necessary to read this section to connect the balance to another device. The RS-232 software interface is discussed in the first portion of this appendix. The RS-232 hardware interface is discussed in the last portion of this appendix.
It is not necessary to include a carriage return or line feed in any command sequence. The balance uses any command character as a terminator for an input string. For example, if you wish to enter a tare weight of 1000 (in the units currently being displayed), simply send “1000T”. This will enter the number 1000 into the tare register. To enter a percentage of 12.35, send “12.35%”. RECEIVING DATA FROM THE BALANCE The print or output format from the balance is known as “string format.
“c3” is the stability character. When a “ “ (space) is transmitted, the reading is not stable. When an “S” is transmitted, the reading is stable. This corresponds to the “OK” symbol on the display. The string output is always terminated by a carriage return and line feed. The following are some examples of string output: +12.3456 PS +0.846 IO UNABLE means that the weight is 12.3456 lbs. stable means .846 ounces, INT mode enabled means that the last operation was not allowed.
encountering this error is small. THE VERIFY FUNCTION When many balances or other peripherals are connected to a computer, it is useful for the computer to be able to check on the status of these devices. The verify function can be used to determine the model number of a balance and determine that the unit is functioning correctly. To invoke the verify function, transmit an ASCII “V”.
PIN DESCRIPTION 1 2 3 7 Protective Ground Scale Receives Data Scale Transmits Data Protective Ground It is necessary for the receive data pin of the external device to be connected to pin 3 (transmit data pin) of the scale. Likewise, the transmit data pin of the external device must be connected to the receive data pin (pin 2) of the scale. With certain devices such as computers with 9 pin serial ports (DB9), pins 2 and 3 must be "crossed.
Appendix V Accessories and Options The following accessories are available for Setra counting scales. Ask your dealer for current price information and/or a demonstration. Part Number Description 401160 DYMO/Setra 300 - quiet, direct thermal printer for labels or receipt paper. Communicates at 2400 baud via RS232 interface. Printer comes with a Setra balance to printer ready cable. It uses a switching power supply and can be operated in 100 to 240 VAC, 47 to 63 Hz.
Appendix VI In Case of Difficulty Setra balances are designed to be easy to use. If, however, you have reached a state in which the scale will no longer follow your instructions, you may wish to “reset” the scale. It is possible to do so by following this sequence. 1. 2. 3. Remove all weight from the pan. Press the — and clear keys to clear the display and set all registers to zero. Press the tare key. This sets the displayed reading to zero.
Appendix VII Specifications MODEL 500L 2000L 5000L 12000L Capacity 500 grams 1.1 lbs. 2000 grams 4.4 lbs. 5000 grams 11 lbs. 12,500 grams 27.6 lbs Precision + 0.0005 grams + 0.005 grams + 0.015 grams + 0.05 grams Readability 0.001 grams 0.01 grams 0.01 grams 0.1 grams Linearity ± 0.002 grams ± 0.01 grams ± 0.02 grams ± 0.
Appendix VIII Limited Two Year Warranty Setra Systems, Inc., warrants the equipment manufactured by it to be free from defects in material and workmanship. Upon return, transportation charges prepaid, to Setra’s factory within two years of original shipment, Setra will, at no charge, repair or replace, at its option, any equipment which it determines to contain defective material or workmanship and will return said equipment to purchaser, transportation prepaid to any point in the United States.
Index accessories 3, 27 accuracy 5, 20, 21 APW 8, 12, 23, 24 auto zero tracking 14 battery 6, 27, 29 baud rate 14, 17, 18, 21, 22, 24, 25, 27, 28, 29 bUSY 8, 19, 26 cable 25, 26, 27, 28 calibration 3, 5, 7, 9, 10, 18, 20, 28 carats 8, 9, 23 clear 6, 7, 8, 9, 11, 12, 13, 18, 19, 20, 22, 28 Clear To Send 26 computer 3, 14, 17, 21, 22, 24, 25, 26, 28 continuous print 23, 24, 25 conv 7, 9, 15, 16, 19, 20, 22 draft 5, 11 draftshield 27 factory calibration 18 factory defaults 18, 28 firmware 18 grams 7, 8, 9, 15,