TQC Sheen CP1 Manual de usuario
ISSUE 1
C
ONE AND
P
LATE
V
ISCOMETER
Operating Manual
1
Contents
Contents .................................................................................................................................................. 1
1 Safety Instructions ................................................................................................................................ 2
2 Packing information .............................................................................................................................. 3
3 Installation information ......................................................................................................................... 4
4 Introduction .......................................................................................................................................... 5
5 Instrument Operation ........................................................................................................................... 8
6 Instrument Control .............................................................................................................................. 1 0
7 Obtaining good results ....................................................................................................................... 35
8 Maintenance, cleaning and condition ................................................................................................. 38
9 Specification ....................................................................................................................................... 40
10 Operational accessories................................................................................................................... 42
2
1
Safety Instructions
1. Read this operating manual carefully before using the machine.
2. Retain this operating manual for future reference.
3. Observe all safety and warning markings on the machine.
4. Always position the unit on a solid, level surface.
5. This machine must only be used in areas electrically classified as NON-
HAZARDOUS.
6. Ensure the voltage setting matches your local power supply.
7. The power supply to the instruments IEC inlet socket must be connected to a
supply with earth, using the IEC power cord supplied.
8. Safety critical components:
a. This machine must be fitted with fuses as specified in this manual and as
appropriate to the supplied voltage.
b. Any replacement Mains Lead must have an equivalent specification to the
one supplied.
9. When operating the machine, remove any loose clothing or jewellery that could
become entangled and beware of moving parts.
10. Use normal handling methods taking care when unpacking and lifting the
instrument.
11. Do not use excessive amounts of paint or ink, the build-up of which may create a
fire hazard.
12. In order to avoid a fire hazard do not use flammable solvents when cleaning the
instrument unless absolutely necessary and in any case do not use on front panel
or labels.
13. Avoid solvent fumes when cleaning or using the instrument.
Do not dispose of this product with household, commercial or industrial
waste. Please refer to local disposal methods or contact us regarding the
proper handling of end-of-life electrical and electronic equipment.
Protection is impaired if used in a manner not specified by the
manufacturer.
3
2 Packing information
The instrument is supplied with smaller items separately packed. Carefully open the
top of the packaging before removing the instrument.
1. Identify all the items on the packing list. A copy of the packing list is provided
below for reference. Remove the separate items on top. The instrument is
protected by a plastic bag that includes desiccant sachets.
2. Remove the top of the packaging and then remove the instrument from the
packing case using both hands to lift the base and place securely on the bench
before removing the plastic cover. Safely dispose of the desiccant sachets.
3. Refer to the installation instructions.
Packing list
The following items will be included:
Viscometer
Mains power cable
Operating handle
10 protective front covers
User manual
4
3 Installation information
Please read all the relevant information before attempting installation.
Ensure the instrument is situated on a firm, hard, level surface, strong enough to
support its weight without significant vibration and in a well-ventilated area with
adequate access to the front and sides. The bench height must allow easy access to
the instrument and controls. Keep the left and right ventilation openings in the base
free from obstruction.
Remove the operating handle from its separate packaging and screw firmly into the
operating lever on the right-hand side.
The instrument uses a universal input voltage power supply.
Use the IEC lead provided to connect to the mains supply. If in doubt, consult a
qualified electrician.
The power inlet connector is located on the rear of the instrument’s base. The power
inlet houses the mains input fuse(s) and mains power switch. Check that the mains
switch is off and disconnect the mains plug before connecting the mains lead. Connect
the mains plug and then switch the instrument on. The display will light and the
instrument will go through a self-test procedure. Allow at least 30 minutes standing-
time before use the first time the instrument is switched on (or longer if cold).
5
4 Introduction
The Cone and Plate Viscometer was originally designed and developed to measure
the dynamic viscosity of paints that are non-Newtonian in behaviour. These types of
materials exhibit different viscosities depending on the shear rate applied to them.
Application of paints by brush, roller or spray gun, etc. generate shear which also
changes viscosity.
Variation in shear rates from 3000 s-1 to 15000 s-1 can be expected from normal brush
application of paints. A single figure of 10000 s-1 (BS) or 12000 s-1 (ASTM) is
considered a satisfactory compromise in simulating the effects of brush, roller and
spray applications of paints. The cone and plate viscometer was developed in order
to reproduce this effect in the laboratory.
The viscosity of other non-Newtonian liquids may be measured on this type of
instrument providing careful consideration is given to the shear-rate.
The shear rate (units of s-1) in the liquid under test is dictated by the cone angle (θ,
units of degrees) and the rotational speed of the cone, ω (units of radians.seconds-1)
according to the formula: 𝑠ℎ𝑒𝑎𝑟 𝑟𝑎𝑡𝑒 =
𝑤ℎ𝑒𝑟𝑒 𝜔 =
𝑥 𝑟𝑝𝑚
6
A rotational speed of 750 rpm has been chosen and is specified in BS3900 part A7
2000 (and ISO 2884-1 1999). This speed has proven to give accurate results without
generating unwanted heat during the test.
Using this formula, the cone angle required to give a shear rate of 10000 s-1 at 750
rpm is 0.45° (27’). Paint viscosity measurements are very sensitive to temperature
variations and so all tests are conducted under carefully controlled conditions:
achieved by providing a temperature controlled plate on which the cone rotates. The
test sample is applied to the plate and the cone is lowered onto the plate. Any excess
liquid between the plate and the cone is expelled. Both the sample and the cone are
kept within the close temperature limits set by the temperature controller in the
instrument - time is allowed for thermal equilibrium before the test is started.
The cone is set rotating and the torque (which is directly proportional to viscosity)
generated by the motor is measured and displayed.
Note that BS and ASTM standards quote different shear rates in their test methods –
10000 s-1 for BS3900: part A7: 2000 (and ISO 2884-1 1999), and
12000 s-1 for ASTM D4287-00
The original cone and plate viscometer (on which these test methods are based)
employed a synchronous motor to rotate the cone. With a 50Hz mains electricity
supply, the cone will rotate at 750 rpm. Using the same instrument on a 60Hz supply,
will cause the motor to rotate at 900 rpm. The CP1 meets both these standards since
the speed can be set to either 750 rpm or 900 rpm (independent of mains frequency).
Setting the instrument parameters
The instrument is quite flexible – many of the operating parameters can be set. It is
advisable to set the instrument parameters and then enable one of the two security
modes - doing this will prevent inadvertent changes.
Viscosity is displayed in centiPoise (cP), Poise (P), milliPascal seconds (mPa.s) or
Pascal seconds (Pa.s); the SI unit is Pa.s (or mPa.s). The relationship between these
units is –
0.1 𝑃𝑎. 𝑠 = 1 𝑃 = 100𝑐𝑃 = 100𝑚𝑃𝑎. 𝑠
7
The display units may be selected on the instrument, together with the display
resolution. A time of 15 seconds is a good value for both preheat and run times for the
CP1. Allow at least 30 seconds (with a hot cone) for the sample to stabilise at the
higher temperatures; shorter times may be used at the low end of the temperature
range. Once you are familiar with instrument operation, decide on whether manual
operation or automatic operation is best suited to your needs.
8
5 Instrument Operation
Using the cone for your viscosity range, turn the instrument on and allow the plate to
reach the set temperature. After a short time the instrument will display
** Ready **
Ensure that the cone value is correctly set (see top right of LCD).
The instrument is then available for use with the default settings supplied.
Taking a measurement
Ensure the cone and plate are clean.
Place a small amount of material to be tested on the plate (see later for
recommended sample volumes).
Lower the cone GENTLY and fully onto the plate – any excess material will flow
out from the side of the cone. The time taken for the cone and sample to reach
the plate temperature will depend on the sample and ambient temperature. At
least 15 seconds should be allowed and longer if the sample temperature is
significantly different (this can be timed automatically).
Press the start switch.
Allow the instrument to run for the pre-set run time. The result is displayed on
the screen until the next run is started.
Record the result as required.
Raise the head and clean the cone and plate.
Lower the plate onto the cone to keep it at the plate temperature before the
next test.
9
Changing and inserting cones
Fit a CP1 cone to the instrument as shown below –
Overload Error
The instrument measures the torque applied to the rotating cone and automatically
halts (displaying an overload error) if the torque value exceeds the maximum allowed.
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