Thermo Electron Cahn C-34, Instruction Manual

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Page 2: ...5 Ultra Microbalance I N S T R U C T I O N M A N U A L Ready Range Calibrate Tare milligrams microbalance Cahn C 35 A 0 1µg 25mg B 10µg 1250mg A 1 0µg 250mg Cahn C 34 C 35 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

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Page 4: ...CROLLING 11 ELECTRICAL TARING 12 COUNTERBALANCING 12 SUBSTITUTION WEIGHING 13 ELECTROSTATIC 13 RELOCATING THE BALANCE 13 AIR BAFFLES 13 Section 5 Maintenance and Troubleshooting 14 DAILY CARE 14 TROUBLESHOOTING 14 FACTORY REPAIRS 15 SERVICE AND REPAIR 16 Section 6 RS232 INTERFACE 17 RS232 CIRCUITS 17 WORD FORMAT 17 DIP SWITCH SETTINGS 18 OPERATING WITH A COMPUTER 19 INTERCONNECTING CABLES 20 PROGR...

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Page 6: ...osition sensor system and 5 controls circuitry and indicators See Figure 1 Weights or forces to be measured are applied to the sample left side of the beam which produce a force about the axis of rotation An electric current flowing in the torque motor also produces a force about the same axis which is equal and opposite to the force from the beam if the beam is at the beam reference position This...

Page 7: ...avy machinery The Cahn C 34 C 35 is designed for operation between 15 and 30 degrees C and a relative humidity between 5 and 95 non condensing SET UP Carefully unpack the Cahn C 34 C 35 from its box Prepare the weighing chamber by placing the spill plates in the chamber so they conform to the balance Attach the interface cable Cahn 12634 01 between the weighing chamber and the electronics unit Fir...

Page 8: ... plug does not fit your electrical outlet the plug may be cut off and your own plug installed The color code for the Power Cord is Black line or hot White return or neutral Green ground or earth Figure 2 Voltage Source Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 9: ... cutting the strings first with sharp scissors and then removing the strings Do not attempt to remove the tape without first cutting the strings See Figure 3 Figure 3 Freeing the Hangdowns Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 10: ...ress of the key will advance the selection to the next range RANGE LIGHTS Located on the upper left corner of the front panel these red lights indicate which weighing range has been selected and the sensitivity of that range TARE Pushing the key labeled TARE will bring the display to zero if the sample is within the selected Weighing Range of the balance Ready Range Calibrate Tare milligrams micro...

Page 11: ...isplay Since the balance will give either positive or negative weights within the selected weight range the Weight Display shows a plus or minus sign As you change ranges the decimal point is automatically positioned When the weight exceeds the weighting range and E will be shown If the calibrating weight is not in the calibration range of the balance an E3 will appear on the display READY LIGHT L...

Page 12: ...erience with the Cahn C 34 C 35 As you become more familiar with the balance the operating procedures will become routine MEASUREMENT HINTS Always use forceps to handle pans stirrups and weights To avoid contamination do not handle them with your fingers Dip or swab the accessories in ammonia to clean them when necessary Do not grasp the stirrups with the forceps Lift them from below the yoke as s...

Page 13: ...the balance is not in use the chamber doors should be closed to reduce the possibility of contamination or damage TURNING ON BALANCE Connect the balance to line power Turn on the balance with the switch on the rear panel of the electronics unit The Weight Display will show 8 8 8 8 8 8 indicating that the balance has been initialized In this state all previous calibration and calibration points hav...

Page 14: ...om the pivot point of the beam The A sample loop is at the end of the forward facing beam and has a maximum capacity of 1 5 grams The TARE loop is at the opposite end of the beam and also has a maximum capacity of 1 5 grams The B loop is 1 5th the distance from the pivot point as compared to the A loop It is for sample loads up to 3 5 grams This A and B loop information is needed for selecting the...

Page 15: ...ee Substitution Weighing on page 13 PAN SELECTION Two sizes of stirrups are included in the Accessory Kit The stirrup Cahn 09353 01 is for general weighing Also included is open stirrup Cahn 02011 01 which is designed to hold the disposable pans Cahn 01187 01 A wide variety of other stirrups and sample containers are available ZEROING Before putting the stirrups on the Hangdown Loops select the de...

Page 16: ...loop This feature allows you to use a calibration weight with an actual calibration value different from the preset value The procedure below describes the use of scrolling 1 Remove samples or containers from the stirrups Press the TARE key to zero the balance 2 Place Calibration Weight on the sample pan Allow to stabilize 3 Press the CALIBRATE key The Weight Display will display 200 000 or 1000 0...

Page 17: ...and the display will return to zero COUNTERBALANCING Mechanical taring is used when a container weights are larger than the electronic weighing range or when the whole weighing range is needed for the sample weight The purpose of counterbalancing is to achieve a mechanical state of balance of the beam before starting to weigh the sample The procedure for counterbalancing is as follows 1 Select the...

Page 18: ...tic problems Technical Note Static Control for Balances contains more detailed information about static and how to minimize its effects and is available upon request Placing a radioactive ionizing unit Cahn 01269 01 in the weighing chamber works well to remove static charge from the balance surfaces and samples Coating the inside of the weighing chamber window with antistatic solution Cahn 02027 0...

Page 19: ...ght Switch position three 3 Line 14 Section 5 Maintenance and Troubleshooting DAILY CARE No special daily maintenance is required for the C 34 C 35 balance It is recommended that the balance remain in the power ON condition unless the balance will not be used for several weeks or longer Immediately clean all spilled material Wipe it up only with lintless paper cloth IMPORTANT Whenever it becomes n...

Page 20: ...the thread through each diamond shaped hangdown loop and loosely secure both ends of thread to the bottom of the weighing chamber with the chamber pans removed with masking tape Figure 7 Securing the Hangdowns Remove the glass doors from the weighing chamber Repack the balance in its original container or if it is not available wrap the balance in several inches of bubble pack before placing it in...

Page 21: ...ble in case we ask you to try a couple of tests on the equipment If the problem is computer related we will need to know the program version number found at the beginning of the Table of Contents the DOS version in your computer at the DOS prompt enter VER and the contents of your system files To get this system information enter the following commands at the DOS prompt CD press ENTER TYPE AUTOEXE...

Page 22: ...nce RXD Pin 7 Signal Ground this circuit will be connected to the ground of the balance common return GND WORD FORMAT The balance will transmit and receive data in the following format The word length will be seven 7 or eight 8 data bits programmed via the dip switch For details of this switch see Dip Switch Settings There will be no parity transmitted or detected There will be one 1 or two 2 stop...

Page 23: ...tion of the setting of the switch positions four five and six in the following manner NOTE A zero 0 means the switch is closed a one 1 means the switch is open Switch Baud rate 4 5 6 150 0 0 0 300 0 0 1 600 0 1 0 1200 0 1 1 1800 1 0 0 2400 1 0 1 3600 1 1 0 4800 1 1 1 Switch position one 1 controls the operating mode This switch should remain closed to operate in the open loop mode In this mode the...

Page 24: ...loop B ENQUIRE COMMAND DATA FORMAT When transmitting the balance reading to a remote computer the following format will be used 0 25 mg range XX XXXX c carriage return 0 200 mg or 0 250 mg range XXX XXX c carriage return 0 1000 mg or 0 1250 mg range XXXX XX c carriage return There will be either a plus sign or a minus sign followed by the numeric value of the reading in milligrams followed by a co...

Page 25: ... a buffer an OPEN statement is used to open the port a PRINT statement is used to send a command and a LINE INPUT statement is used to assign the data to a variable The following program was written for an IBM PC computer Programs for other computers are similar to this program 10 REM C35 Data Acquisition 20 OPEN COMl 600 N 8 2 CS DS CD AS l 30 CLS PRINT SELECT RANGE 40 PRINT A 25 MG RANGE 50 PRIN...

Page 26: ...weight reading into variable A Lines 170 and 180 look at the status character to assure that the weight reading is stable Lines 190 and 200 strip off the comma and status character from the weight reading Line 210 transforms the weight reading from a string variable to a numeric variable in order to do numerical computation Line 250 contains a CLOSE command to close the buffer and port before find...

Page 27: ... damage to the beam REPEATABILITY or Precision is defined by Cahn as the standard deviation of 10 consecutive weighings of the same mass under ideal conditions READABILITY is the least significant digit which can be resolved from the readout under normal conditions and set up SENSITIVITY is the smallest mass difference that can be detected by the balance PERFORMANCE SPECIFICATION FOR Cahn C 34 C 3...

Page 28: ...hts are Class 6 with a tolerance from 0 1 to 1 mg Tare weights can be identified by the dull finish MAINTAINING CALIBRATION STANDARD For the most effective calibration control over a long period of time we recommend the use of two calibration weights The first weight is used as a primary weight and is kept locked in a secure place Once every six months or at any time when the working calibration w...

Page 29: ...d TEA Analyzer Contact our Field Service department for details on quotations and service other field service related activities The following products are warranted to be free from defects in material and workmanship in the period listed below from the date of purchase from the user or from the date of shipment from Thermo whichever is earlier provided use is in accordance with the operating limi...

Page 30: ...age except 93 07 and 97 07 Nitrate modules are warranted to give ninety days of operation if placed in service before the date indicated on the package Six months from date of purchase by the user or twelve months from date of shipment from Thermo Orion Flash Titration Probe Orion 092518 pHuture Electrode Orion 615700 pHuture MMS Pentrode Orion 617500 Quatrode Orion 617800 and Triode Orion 615800 ...

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