Thermo Electron Cahn C-34 Manuale utente
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Analyze •Detect •Measure •Control™
Cahn C-34 Microbalance,
Cahn C-35 Ultra-Microbalance
INSTRUCTION MANUAL
Ready
Range Calibrate Tare
milligrams
microbalance Cahn C-35
A0.1µg 25mg
B
10µg 1250mg
A1.0µg 250mg
Cahn C-34,
C-35
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AQUAfast, Cahn, EZ Flash, Ionalyzer, ionplus, KNIpHE, No Cal, ORION, perpHect, PerpHecT, PerpHecTion, pHISA, pHix, pHuture, Pure Water, Sage, Sensing the Future,
SensorLink, ROSS Ultra, Sure-Flow, TEA Analyzer, Titrator PLUS, TURBO2 and Wine Master are registered trademarks of Thermo Electron Corporation.
1-888-pHAX-ION, A+, All in One, Aplus, AQUAsnap, AssuredAccuracy, AUTO-BAR, AUTO-CAL, AUTO DISPENSER, Auto-ID, AUTO-LOG, AUTO-READ, AUTO-STIR, Auto-Test,
BOD AutoEZ, Cable-Free, CERTI-CAL, CISA, DataCOLLECT, DataPLUS, digital LogR, DirectCal, DuraProbe, Environmental Product Authority, Extra Easy/Extra Value, FAST QC,
Flash Titration, Flash Titrator, GAP, GLPcal, GLPcheck, GLPdoc, ISEasy, KAP, LabConnect, LogR, Low Maintenance Triode, Minimum Stir Requirement, MSR, NISS, One-Touch,
One-Touch Calibration, One-Touch Measurement, Optimum Results, Pentrode, pHuture MMS, pHuture Pentrode, pHuture Quatrode, pHuture Triode, Quatrode, QuiKcheK,
rf link, ROSS, ROSS Resolution, SAOB, Smart CheK, Stacked, Stat Face, The Enhanced Lab, ThermaSense, Triode, TRIUMpH, Unbreakable pH, Universal Access are
trademarks of Thermo.
Guaranteed Success and The Technical Edge are service marks of Thermo.
PerpHecT meters are protected by U.S. patent 6,168,707.
PerpHecT ROSS are protected by U.S. patent 6,168,707.
ORION Series A meters and 900A printer are protected by U.S. patents 5,108,578, 5,198,093, and German patents D334,208 and D346,753.
Sure-Flow electrodes are protected by European Patent 278,979 and Canadian Patent 1,286,720.
ionplus electrodes and Optimum Results solutions are protected by US Patent 5,830,338.
ROSS Ultra electrodes have patents pending.
ORION ORP Standard is protected by US Patent 6,350,367.
ORION Series A conductivity meters are protected by US Patent 5,872,454.
© Copyright 2003, Thermo Electron Corporation. All rights reserved. Question everything, and Analyze. Detect. Measure. Control are trademarks of Thermo Electron
Corporation.
The specifications, descriptions, drawings, ordering information and part numbers within this document are subject to change without notice.
This publication supersedes all previous publications on this subject.
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Table of Contents
Section 1 Principles of Operation.................................................................... 1
Section 2 Installation ........................................................................................ 2
LOCATING THE BALANCE ...............................................................................................2
SET UP .............................................................................................................................. 2
VOLTAGE SOURCE ..........................................................................................................3
FREEING HANGDOWN LOOPS ....................................................................................... 4
Section 3 Controls ............................................................................................ 5
RANGE ..............................................................................................................................5
RANGE LIGHTS ................................................................................................................ 5
TARE..................................................................................................................................5
CALIBRATE .......................................................................................................................6
WEIGHT DISPLAY ............................................................................................................. 6
READY LIGHT ................................................................................................................... 6
Section 4 Operation ......................................................................................... 7
MEASUREMENT HINTS ................................................................................................... 7
TURNING ON BALANCE...................................................................................................8
WARM UP TIME ................................................................................................................ 8
SAMPLE POSITIONS ........................................................................................................9
RANGE SELECTION ....................................................................................................... 10
PAN SELECTION ............................................................................................................ 10
ZEROING .........................................................................................................................10
CALIBRATION .................................................................................................................11
CALIBRATION SCROLLING ........................................................................................... 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
PROGRAM DEVELOPMENT .......................................................................................... 20
Section 7 Appendix ......................................................................................... 22
GLOSSARY OF TERMS ..................................................................................................22
WEIGHTS ........................................................................................................................23
MAINTAINING CALIBRATION STANDARD ....................................................................23
Section 8 Warranty.......................................................................................... 25
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Photocell
Controls
Circuits
Indicators LED
Flag
Magnet
Magnet
Sample
Balance Beam
Taut Band
Suspension
and Torque Motor
Coil Connection
Rotation at Axis
of Beam &
Coil Assembly
Tor que
Motor Coil
Tare loop
“A” loop
“B” loop
1
Section 1 Principles of Operation
The Cahn C-34/C-35 is a very sensitive weight and force measurement instrument. It is designed
for weights and forces up to 3.5 grams and is sensitive to changes as small as 0.1 micrograms.
The balance may be described as a force-to-current converter. It consists of (1) a balance
beam mounted to, supported by, and pivoting about the center of taut ribbon; (2) a torque
motor coil located in a permanent magnetic field and also mounted to the taut ribbon;
(3) sample suspension fixtures; (4) a beam position 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 reference position is detected by the beam
position sensing system. A greater force on the beam will require a greater opposite force from
the torque motor in order to keep the beam at its reference position. Therefore, the current
necessary to produce the required torque motor force is a direct measure of the force on the
beam. The process of calibration allows this current to be measured in units of weight (grams).
Figure 1: Principles of Operation
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2
Section 2 Installation
LOCATING THE BALANCE
The Cahn C-34 or C-35 may be used in almost any location. It does not require leveling. How-
ever, the level should not change after zeroing. Try to avoid exceptionally shaky tables, direct
sunlight or drafty locations (such as near air conditioners). For ultimate microweighing, avoid
locations near equipment which generate vibrations such as vacuum pumps, air conditioners or
heavy 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. First connect the cable to the Remote Port of the weighing chamber then the
other end to the Remote Port on the electronics unit.
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Power Line
Cord
Fuse RS232
Remote
!
0
I
3
VOLTAGE SOURCE
The Power Cord is fitted with an U.S.-type plug. If the 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
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4
FREEING HANGDOWN LOOPS
Free the Hangdown Loops inside the weighing chamber by 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
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5
Section 3 Controls
The following brief description of the Cahn C-34 and C-35 controls will help you to understand the
operation of the balance and will make weighing easier and faster. Figure 5 illustrates the
front panel of the control unit.
Figure 4: Front Panel
RANGE
This key allows you to select one of the weighing ranges of the balance. Each press 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
microbalance Cahn C-35
A
0.1µg 25mg
B
10µg 1250mg
A
1.0µg 250mg
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