MB23 / MB25 Moisture Analyzer

MB23 / MB25 Moisture Analyzer
Halogen Drying Method Moisture Analyzer
DSH Series
Instruction Manual
Shanghai Yoke Instrument Co., Ltd.
Add:No.22, LANE 5018, SHANGNAN ROAD, PUDONG, SHANGHAI- 200124 CHINA
Tel: 86 21 54561027 Fax: 86 21 50823267 E-mail: [email protected]
www.yoke-fac.com
1
EN-1
1. INTRODUCTION
Safety Precautions
For safe and dependable operation of this moisture Analyzer, please comply with the following safety
precautions:
 Use the Analyzer exclusively for determination of moisture in samples. Improper operation of the
Analyzer can endanger personnel and cause property damage.
 If the Analyzer is used in a manner not specified in this manual, the protection provided may be
impaired.
 Verify that the input voltage printed on the voltage identification label information and the plug type
matches the local AC power supply.
 The Analyzer has a 3-pin power cable that includes a ground connection. Intentionally disabling the
equipment grounding connection is prohibited.
 Do not position the Analyzer so that it is difficult to disconnect the Power Plug from the local AC power
supply.
 Make sure that the power cord does not pose any obstacle or tripping hazard.
 Do not operate the Analyzer in hazardous, wet or unstable environments.
 Disconnect the Analyzer from the power supply when cleaning the Analyzer.
 Ensure sufficient free space around the Analyzer as a safety zone. Allow at least 1 meter of free space
above the Analyzer.
 The Analyzer must be operated only by trained personnel who are familiar with the properties of the
samples being tested and with the equipment operation.
 Use appropriate personal safety equipment such as safety glasses, gloves, protective clothing and
respirators.
 Do notmake any modifications to the Analyzer.
 Service should be performed only by authorized personnel.
The Moisture Analyzer works with heat!
 Never place flammable materials on, below or next to the Analyzer.
 Use caution when removing a test sample. The sample, the sample chamber, the heating element and
the surrounding areas may be very hot and can cause burns.
Some samples require special care!
 Should there be any uncertainty regarding the safety of a substance, perform a careful risk analysis. In
such cases, never leave the Analyzer unattended.
 Fire or explosion: Substances which contain solvents or release flammable or explosive vapors when
heated. With such samples, work at drying temperatures low enough to prevent the formation of flames
or an explosion.
 Poisoning or burning: Substances which contain toxic or caustic components should only be dried in a
fume hood.
 Corrosive: Substances which release corrosive vapors when heated should be tested in small amounts.
 The user assumes responsibility for any damage caused by the use of these types of samples.
Application Disclaimer
Moisture determination applications must be optimized and validated by the user according to local
regulations. Application specific data provided by YOKE is for reference purposes only. YOKE waives all
liability for applications based on this data.
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EN-2
2. INSTALLATION
Package Contents
Moisture Analyzer
Draft Shield
Sample Pans
Pan Support
Power Cable
Scale Pliers
Weight Pliers
Weight (10g/50g/100g)
Instruction Manual
Selecting the Location
 Operate the Analyzer on a firm, level surface.
 Select a location that is safe and with adequate ventilation. Fire, corrosive or toxic fumes and other hazards associated
with the test samples will require specially prepared locations.
 Ensure that the location has easy access to the local AC power supply.
 Avoid locations with rapid temperature changes, excessive humidity, air currents, vibrations, electromagnetic fields,
heat or direct sunlight.
Installing Components
(1) Install and position Draft Shield
(2) Install Pan Support, turn until it
engages into position
(3)Place a sample pan over the pan
support.
Connecting Power
Verify that the input voltage printed on the voltage identification label information
and the plug type matches the locations AC power supply.
Connect the supplied power cable to the power input receptacle at the rear of the
Analyzer and into a properly grounded power outlet.
After connecting the Analyzer to the AC supply (standby mode), allow the Analyzer to warm up for at
least 30 minutes for best results.
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EN-3
3. OPERATION
Display
g
Stable indicator
Percent solids
Percent moisture
grams
Temperature setting or current chamber temperature (Celsius)
Time setting (minutes : seconds)
Heating
Controls
Button: Name:
Quick Functions:
Button: Name:
Quick Functions:
On / Off
On (short press) / Off (long press)
Set
Increase value
(short or long press)
Tare/Back
Tare (short press)
Back (short press)
Set
Decrease value
(short or long press)
Print / Cal
Print (short press)
Calibrate (long press)
Temp
Time
Temperature Setting (short press)
Test
Time Setting (short press)
Start to test (short press)
There are also several modes of operation which affect how each button operates. Please refer to the fo llowing section.
Operating Modes
Standby Mode
When the Analyzer is connected to AC power and the display is off, the unit is in Standby mode.
Start (Short press) Turns on the display and enters Weigh mode.
Print (Long press) Displays the RS232 settings (see Section 6, RS232 Data Connection.). Thereafter,
(Short press) Re-enters Standby mode (off).
Weigh Mode
The display shows the weight of items placed on the pan support.
Tare
(Short press) Sets the displayed weight value to zero
Start
(Long press) Enters Standby mode (Off)
The following operations can be initiated:
Temp
(Short press) Enters Edit mode for the temperature setting, the value will blink
Time
(Short press) Enters Edit mode for the time setting, the value will blink
Start
(Short press) Activates Run mode, initiates test with a sample greater than 0.5 g
Cal
(Long press) Initiates weight or temperature Calibration (see Section 5, Maintenance)
Temperature / Time Edit Mode (Preparing a Test)
Temperature editing: (50° to 160°C in 5° steps)
Temp
(Short press) Enters Edit mode for the temperature setting, the value will blink.
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EN-4
Set
(Short or long press) Increases the value of the temperature setting.
Set
(Short or long press) Decreases the value of the temperature setting.
Tare
(Short press) Accepts the blinking value and returns to Weigh mode.
Start
(Short press) Exits Edit mode without saving changes.
Note: After 5 seconds of no activity the blinking setting is automatically saved and the mode returns to Weigh.
Time editing: (1 to 60 minutes in 30 second steps, 61 to 99 minutes in 1 minute steps)
The time parameter can be set to timed duration or AUTO (the test ends when the Analyzer detects the weight loss has
ended). Selecting AUTO or timed duration:
Time
(Short press) Enters Edit mode for the time setting, the value will blink.
Time
(Short press) While the time setting is blinking, toggles between AUTO and a time value.
Tare
Accepts the blinking setting.
If AUTO is selected Weigh mode is entered.
If time duration is selected:
Set
(Short or long press) Increases the value of the time setting.
Set
(Short or long press) Decreases the value of the time setting.
Tare
(Short press) Accepts the blinking value and returns to Weigh mode.
Start
(Short press) Exits Edit mode without saving changes.
Note: After 5 seconds of no activity the blinking setting is automatically saved and the mode returns to Weigh.
Run Mode (Performing a Test)
A moisture determination test is initiated. The results in progress are displayed.
Start
(Short press) Activates Run mode, initiates test with a sample greater than 0.5 g.
%g
Changes the unit of the displayed result: weight (grams) > % Moisture > % Solids.
Stop
(Short press) Manually stops the test in progress.
Print
Sends the current displayed value to the RS232.
Result Mode
At the end of the test (Run Mode), the display blinks the test result.
%g
Changes the unit of the displayed result: weight (grams) > % Moisture > % Solids.
Tare
Exits to Weigh mode.
Print
Sends the current displayed value to the RS232.
How to Prepare a Test
Moisture determinations can be made very simply. The three steps are:
(1) Setting the drying temperature (see Section 3).
(2) Setting the drying time, and (see Section 3).
(3) Preparing the sample to be tested:
 Place the Pan Handler with empty test pan on the Pan Support (see Section 2).
 Press Tare to zero out the pan weight.
 Remove the test pan and place the test sample onto the test pan. The sample must be greater than 0.5g.
 Spread the sample evenly across the test pan.
 Place the test pan with the sample on the Pan Support. The weight value of the sample will be displayed.
Section 4. Test Optimization gives hints on determining optimal drying temperatures and times, sample
sizes, and proper preparation of samples.
How to Perform a Test
(1)
(2)
(3)
(4)
(5)
(6)
Close the Heater Cover.
Press Start to begin the test (press Start again to stop the test in progress).
When the test is over the display will blink showing the final result.
To change the displayed units, press %g.
To print the current displayed value, press Print.
Press Tare to exit to Weigh mode.
Performing a Trial Test
Prior to actual testing, a test run can be performed with these suggested settings:
(1) Temperature = 120
(2) Time = AUTO
(3) Sample = 3g of water. Place a glass fiber pad (included with the Analyzer) on the test pan, place on Pan Support.
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Press Tare to zero the pan weight. Add 3g of water to the fiber pad.
(4) Press Start to initiate the test. A perfect result on the trial test would be: 0g, 100% moisture or 0%solids.
Results may vary slightly due to weighing errors involved with a small sample, or other experimental
errors. See also Section 4. Test Optimization.
4. TEST OPTIMIZATION
Moisture is determined from the weight loss of a sample dried by heating.
The speed and quality of the measurement process will rely on the following parameters. Experimentation will also help
ascertain the optimal setup of these parameters:
 Drying temperature
 Drying time
 Sample weight
 Sample preparation
 Type of sample
Drying Temperature
 The drying temperature exerts a controlling influence on the drying time (e.g., a low temperature can prolong the drying
time unnecessarily).
 Select a drying temperature that neither decomposes nor changes the chemical structure of the sample.
 Some samples can give off different amounts of moisture at different drying temperatures. In these cases, deviations
can be compensated by changing the drying temperature.
Drying Time
This analyzer has three methods to establish the drying time.
 Manual , where the user stops the test in progress by pressing the Stop button. The test must be longer than 30
seconds to be a valid test.
 Automatic , which ends the drying process when detecting less than 1mg loss in 60 seconds. To keep the drying time
short, select a small sample weight that still maintains the required measurement accuracy.
Timed duration , where the test ends when the pre-set drying time elapses.
Sample Weight
The weight of a sample influences the measurement time and repeatability of the results. With large amounts of samples,
more moisture must be vaporized and the process takes longer. Generally, the sample weight should be between 3g and
20g. 3g samples give fast results with some sacrifice in accuracy. 20g samples generally give more consistent results
but require a longer test time.
Another way to determine the sample weight is to use the relation between sample weight and repeatability, as shown in
the following table. If requiring repeatability results better than ±0.3%, for example, the table indicates that a sample
weight of at least 2g will be needed.
Sample Weight
0.5g
1g
2g
5g
10g
Repeatability
±1.0%
±0.6%
±0.3%
±0.12%
±0.06%
Sample Preparation
Samples must always be uniform and representative of the total amount to obtain accurate and reproducible results.
When preparing samples, it is essential to ensure thin and uniform distribution of the sample on the test pan (i.e., avoid
piling and excessive amounts).
Types of Samples
Pasty, fat containing and melting substances
Use a glass fiber filter to increase the surface area of these types of samples (e.g., butter). The moisture in these
substances is more uniformly distributed through the filter. The increased surface area results in faster and more complete
vaporization of the moisture.
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Liquid substances
Liquids (e.g., dispersions) tend to form drops on the test pan, which prevents rapid drying. Use of a glass fiber filter
shortens the drying time significantly as the filter distributes the liquid sample over a larger surface area.
Skin-forming and temperature sensitive substances
Formation of a film on the surface of these samples can prevent complete determination of moisture. Using a glass fiber
filter to cover the sample allow gentler and more beneficial heating, improving reproducitility.
Sugar-containing substances
Samples containing large amounts of sugar tend to caramelize. Ensure that a thin and uniform layer is applied and a
moderate temperature selected. The sample can also be covered with a glass fiber filter that improves reproducitility.
The following substances present risk of fire, explosion, damage or injury.
Should there be any uncertainty regarding the safety of a substance, always perform a careful risk
analysis. In such cases, never leave the Analyzer unattended.
Volatile substances
With volatile samples, rapid application of the sample on the test pan is advisable, to limit the moisture from escaping
before the initial weight is recorded. These substances also include samples treated with solvents, and substances which
contain solvents or release flammable or explosive vapors. Work at drying temperatures low enough to prevent the
formation of flames or an explosion. Always work with small samples (maximum 1g).
Poisonous and toxic substances
Substances which contain toxic or caustic components should only be dried in a fume hood.
Corrosive substances
Substances which release corrosive vapors when heated (e.g. acids) should be tested in small amounts. The vapors can
condense on the Analyzer parts causing corrosion.
5. MAINTENANCE
Weight Calibration
Weight calibration is rarely required. Moisture analyzers use relative weight values to determine the results, so a minor
offset from the absolute weight has little effect on accuracy. YOKE moisture analyzers have rugged, high quality
temperature stabilized weighing modules that retain their calibration over long periods of time.
(1) Remove any load on the Pan Support including the sample pan.
(2) Press and hold Cal while in the Weigh mode. “CAL” will appear followed by “50.00g”.
(3) Place a 50g calibration mass on the Pan Support. The display will show “-----”.
(4) Remove the mass when “--0--” is shown on the display. The display will show “-----”.
(5) The Analyzer will return to Weigh mode when calibration is complete.
Note: Pressing START will cancel the calibration without saving the changes.
Temperature Calibration
Temperature calibration is rarely required under normal use. If the heating elements become dirty, the usual setting may
no longer produce the same results. A temperature calibration can correct for these changes.
Use only the YOKE Temperature Calibration Kit (accessory) to perform temperature calibration.
Damage to the Analyzer can occur if using other methods.
Remove the Pan Support. “Err8.4” must be shown on the display for the temperature calibration to start.
Place the YOKE Temperature Calibration Kit into the temperature chamber (see Kit Instructions). Close Cover.
Press and hold Cal until “Cal” is displayed. When Cal is released “TC100” will appear and the heater turns on.
After 15 minutes, the unit will beep and blink “100” on the display.
Read the thermometer on the Temperature Calibration Kit and press Set
to change and match the displayed
value to the thermometer reading.
(6) Press Tare to enter the value. The display will show “TC160” as the heater turns on again.
(7) After 15 minutes, the unit will beep and blink “160” on the display.
(8) Read the thermometer on the Temperature Calibration Kit and press Set
to change and match the displayed
value to the thermometer reading.
(9) Press Tare to enter the value. The Analyzer returns to Weigh mode.
(10) Temperature calibration is now complete.
Note: If Tare is not pressed within 10 minutes the calibration will be aborted.
(1)
(2)
(3)
(4)
(5)
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EN-7
Troubleshooting
Symptom / Display
Cannot turn on
Weight value blinking
“Tare” shown
“Close Cover” shown
Poor accuracy
Cannot calibrate
Err 7.0
Err 8.1
Err 8.2
Err 8.3
Err 8.4
Err 9.5
Err 53
Possible Cause
No power to Analyzer
Sample weight less than 0.5g
Pan weight needs set to zero
Cover needs to be closed before starting test
Improper calibration
Unstable environment
Unstable environment
Incorrect calibration masses
Time out
Pan Support has load during power on
Pan Support was removed prior to power on
Weight on Pan Support exceeds capacity
Pan Support was removed during weighing
Factory calibration data corrupted
EEPROM Checksum error
8
Remedy
Verify connections and voltage
Increase samle size
Press Tare
Close Cover
Perform calibration
Move the Analyzer to suitable location
Move the Analyzer to suitable location
Use correct calibration masses
Remove weight from pan support
Install Pan Support
Remove weight from the Pan Support
Re-install Pan Support
Contact the authorized dealer
Contact the authorized dealer
EN-8
6. TECHNICAL DATA
Admissible Ambient Conditions
Location:
Indoor use only
Temperature:
10°C to 40°C
Relative humidity: 15 % to 80 % at 30°C non-condensing
Warm up time:
At least 30 minutes after connecting the Analyzer to the AC supply;
when switched from standby mode the Analyzer is ready for immediate use.
Height above sea level: Up to 2000 m
Power Input:
100VAC - 120VAC, 3A, 50/60Hz or 200VAC -240VAC, 3A, 50/60Hz
Voltage fluctuations: -15% +10%
Power load:
250W(Maximum during drying process)
Power line fuse:
1 piece, 5 x 20mm, 8A 250V
Protected against dust and water, Pollution degree: 2, Installation category: Class II
Specifications:
Model
DSH-10A
Weighing Range
10g
Readability
10mg
Repeatability
(3g samples)
0.50%
Minimum Sample
Amount
0.5
Advised Sample
Amount
3-10g
Heat up time
1-99ninutes,1 minutes interval
Temperature
Program
Standard
Terminal Control
Timing, Automatic
Heating
Temperature
Range
50-180
Showing Content
degrees
Moisture%, Solid%, Weight, Time, Data etc
Pan Size
100mm
Dimension
265x160x150
Net Weight
5kg
Heating Source
Halide Torch
Communication
RS232 Pin Connections
GND
Female DB9 connector
RxD
TxD
5
Pin 2: Analyzer transmit line (TxD)
Pin 3: Analyzer receive line (RxD)
Pin 5: Ground signal (GND)
1
9
6
CTS
RTS
RS232 Data Settings (default)
Baud Rate: 9600
Data Bits: 7
Parity: N
l
9
Stop Bits: 2
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