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1.  INTRODUCTION 

 
The FIRST PLUS is a device able to measure the viscosity, which is the capacity of a product 
to resist to the flow. 

The fluid  is forced to  a shear  rate (rotational  speed)  and the  shear  stress  (motor torque)  is 
measured. The values of shear rate and shear stress then make it possible to calculate the 
viscosity using the Newton equation and the constants associated with the mobile used. 

Equation of Newton is:  

With 

 for viscosity in Pa.s, 

 for shear stress in Pa and    for shear rate in s

-1

Shear stress and shear rate are calculated by using constants of each measuring system as: 



M x K

Tau

 with M for motor torque in mNm and K

Tau

 in Pa/mNm. 

   = n x K

D

 with n for rotational speed in rpm and K

D

 in s

-1

/ rpm. 

The viscometer calculates the viscosity by dividing the shear stress by the shear rate for each 
measuring point. The K

Tau

 and K

D

 constants used depend on the measuring system selected 

for the measurement. 

Viscosity depends on the temperature, then it must be essential that all viscosity values are 
associated to a reading of the sample temperature, in order to compare viscosity for different 
samples. 

There are some products for which the viscosity, to a constant temperature, stay unchanged, 
even  if  we  change  the shear  rate. Those  samples  are  named 

Newtonian  fluids

,  i.e. : Oils, 

Water, Glycerol, etc…However, many substances have a variation of viscosity in function of 
speed  of  shearing,  and  the  Flow  Behaviour  of  those  samples  could  be  determined  with 
measuring instruments able to set many speeds of rotation. 

The

 

viscometer is constituted with a continuous current motor and an optical encoder, in order 

to warranty a great accuracy of rotational speed of bob, on all torque range. 

The viscometer has an easy touch screen display, on which you could read the 

speed

shear 

rate

  (according  to  spindle), 

measuring  spindle

  reference,  the 

measured  torque

  and  the 

dynamic viscosity 

in 

mPa.s (=cPoises)  or Pa.s

The Viscometer FIRST PLUS can be used with different measuring system. You will find below 
a list of compatible measuring system with this viscometer. 

-

 

MS ASTM: 

Measuring spindles according to ASTM / ISO 2555 (316L stainless 

steel).These  systems  are  ideally  suited  for  simple  viscosity  measurement  at  controlled 
rotational speed in all areas of activity. The standard recommends use of 600ml beaker for 
measurement.  

-

 

MS  ULV:

  Measuring  system  (Aluminium)  for  low  viscosities  usable  with 

instruments  LR  version.  This  system,  unlike  the  MS-ASTM  or  MS-DIN  systems,  makes  it 
possible to measure low viscosity products in control by applying a shear rate. Its advantage 
is to be compatible with instruments in LR version unlike all other measuring systems. 

Содержание FIRST PLUS LR

Страница 1: ...1 USING MANUAL FIRST PLUS LR...

Страница 2: ...EW RESULT 13 2 2 4 REMOTE CONTROL 14 2 2 5 PARAMETERS 15 2 2 5 1 LANGUAGES 15 2 2 5 2 DATE HOUR 16 2 2 5 3 SOUNDS STANDBY LIGHTING 16 2 2 5 4 USER NAME 17 2 2 5 5 UNITS 19 2 2 5 6 MEASURING SYSTEM 19...

Страница 3: ...the shear rate Those samples are named Newtonian fluids i e Oils Water Glycerol etc However many substances have a variation of viscosity in function of speed of shearing and the Flow Behaviour of tho...

Страница 4: ...order this foam can be inside a box or a carrying case and can contain measuring system In detail you will find different part in your box as shown below Hardened Aluminium Stand Aluminium Arm Screw...

Страница 5: ...d a clearer view of your data and analysis results On Off Switch Always with the aim of improving your experience LAMY RHEOLOGY has decided to equip all of its PLUS range with a luminous and design sw...

Страница 6: ...ped with a ring with a clamping button that is used as a stop for a repeatable positioning during the measurement The rod is equipped with a white Delrin ring acting as a stop thus avoiding the arm be...

Страница 7: ...ussian Spanish Compatible measuring system MS ASTM MS ULV Compatible temperature control EVA LR EVA DIN CT DIN RT 1 PLUS Supply voltage 90 240 VAC 50 60 Hz Options Carry case PN 100500 Rack stand PN P...

Страница 8: ...you must first screw the rod to the base with screw and key provided Then make sure to insert the white Delrin cylinder and set it to the lowest position Then place the stop ring on the stainless ste...

Страница 9: ...button to switch on your device see section 1 2 2 1 STATE ICONS Once your device is switched on you will see some icons on Touch Screen No Device is connected to the instrument Only one Device is conn...

Страница 10: ...Acces is always available by clicking 2 2 2 Measure Measure tab is central part of your FIRST PLUS LR Before to use it you should install your measuring system and your sample Please see section 3 Th...

Страница 11: ...re using shear rate you have to use constant KD of your measuring system information available in section 2 2 5 6 With speed unit in rpm shear rate in s 1 and KD is rpm s 1 Then your settings are ok y...

Страница 12: ...to the upper limit If you change speed or spindle you will need to make a new zero adjustment Picture below show how should be the closer position regarding lower limit Then your measurement is finish...

Страница 13: ...ich one you want to read Then you selected a measure you will see result and get possibility to print it if a printer is connected By clicking on Global Export you will have possibility to transfer al...

Страница 14: ...By click on tab you could delete saved measure one by one as you want from your FIRST PLUS LR memory Then you click on Delete saved data will be completely deleted from internal memory without any ne...

Страница 15: ...our device It is reachable by clicking on icon wheel in upper left corner of touch screen This icon is only available then you are in Main menu 2 2 5 1 Languages Enable you to select language of your...

Страница 16: ...ode of your FIRST PLUS LR Choose if you want to get sound during using touch screen Choose if you want to switch off automatically your device after no using After selecting Standby enable you will ha...

Страница 17: ...st account which will become the administrator and thus create or delete another operator account After specifying the name and password the administrator will be named in red in the list You can now...

Страница 18: ...rning to the Main Menu you will see the name of the operator in use By clicking on the arrow below the name of the operator you can switch off the FIRST or change operator If the instrument is switche...

Страница 19: ...e and corresponding constant You are not allow to change constant of existing measuring system If you want to use new constant you have to create a new measuring system with name as example Copy of an...

Страница 20: ...meters and settings of your device It should be set by an administrator or responsible of the device This function is not comparable to the User name menu please see section 2 2 5 4 It should be use i...

Страница 21: ...ted you will see this icone on FIRST Screen see picture below Protected mode protect programs measuring parameters and some menu as shown on pictures below 2 2 5 8 Miscellaneous This menu allow you to...

Страница 22: ...he print interval time you want during measurement The FIRST can be connected to all printers with a PCL5 print protocol This includes many A4 printers The connection is made to the USB host port on t...

Страница 23: ...on your viscometer Indeed some measuring systems require the installation of accessory before the insertion of the spindle As the FIRST PLUS LR get only one kind of bayonet coupling system way to inst...

Страница 24: ...ity fluids and R mobiles for medium to high viscosities see tables below Designation spindle Part Number Spindle Part Number Complete setb Viscosity range for version LR mPa s RV1 111001a 111948 Not U...

Страница 25: ...rpm For the measurement of a high viscosity product choose ASTM R7 and run the machine at low speed for example 1 rpm Place the measuring head in the highest position use screw on aluminium arm as wro...

Страница 26: ...een using a gage Ensure that the measured torque is always sufficiently far from the lower and upper limits at least 5 above and below If this is not the case you can either change the measuring spind...

Страница 27: ...trol EVA DIN PLUS and CT DIN or alone without any other accessory The part number 116031 is dedicated for measurement with disposable cup and include item 116016 111934 114436 and 114306 100 disposabl...

Страница 28: ...the tube is properly installed check that the temperature sensor on the viscometer is at least one centimetre deep into the liquid When using your viscometer with a temperature control system EVA MS...

Страница 29: ...ng careful if the temperature is high You can then remove the cylinder from the tube to clean it Remove the cap from the tube to clean it Clean the temperature sensor 3 3 2 Use of Item 116031 The meas...

Страница 30: ...r When the measuring head is properly positioned there is no need to lock the position using the screw on the arm Also be sure to allow sufficient time for stabilization if the measurement temperature...

Страница 31: ...nstall spindle L2 See section 2 2 2 Select spindle L2 and speed 60 rpm Make a zero adjustment See section 3 2 and immerge the spindle in the oil at the good level mark on the spindle Wait for 15 minut...

Страница 32: ...32 LAMY RHEOLOGY 11 A rue des Aulnes 69410 Champagne au Mont d Or France Tel 33 0 4 78 08 54 06 Fax 33 0 4 78 08 69 44 contact lamyrheology com...

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