Vapro® Vapor Pressure Osmometer
Discovery Diagnostics, Canadian distributor
for Wescor's Vapro® Vapor Pressure Osmometer for osmotic measurement
of whole blood, viscous samples & tissue specimens
Model 5520 Vapro® Vapor
Pressure Osmometer. A high-precision vapor pressure osmometer that
produces accurate osmolality values on 10 microliters of a wide range
of solutions from biological and industrial sources, especially valuable
in research. The most advanced, easy to use vapor pressure osmometer
ever developed.
The menu-driven Vapro®
Osmometer determines osmolality at room temperature with sample in
natural equilibrium.
What you don't get are cryoscopic artifacts due to high viscosity,
suspended particles, or other conditions that interfere with freezing
point determinations. The superbly accurate Vapor Pressure Osmometer
has a much broader range of error-free applications.
Functions are selected
from a simple menu. The Vapro® Vapor Pressure Osmometer is
self-calibrating and exceptionally stable. Built in self-diagnostics
alert you to any malfunction or procedural error. Statistical functions
display average and standard deviation of several samples, and the
handy clean test monitors thermocouple cleanliness. Regardless of
the application, the Vapro® Osmometer will be a remarkable
partner in the laboratory.
In most solutions, changes in concentration are accompanied by linear
and proportional changes in the cardinal colligative properties
of the solvent-vapor pressure, freezing point and boiling point.
Measuring any of these properties provides an indirect indication
of osmolality, but among them, only vapor pressure can be determined
without a forced change in the sample's physical state.
In the Vapro osmometer, vapor pressure is determined thermometrically
by a fine wire thermocouple suspended in a small vapor space above
the specimen in a sealed sample chamber. During a measurement cycle,
the thermocouple undergoes a series of microprocessor controlled
temperature changes.
Step 1
After sample insertion, temperature and vapor pressure naturally
equilibrate in the sealed chamber. The thermocouple senses the exact
temperature of the air above the specimen, and the microprocessor
set this value as the null, or reference point for the measurement.
Step 2
Next, the thermocouple is Peltier-cooled below the dew point temperature.
Microscopic water droplets begin to condense upon the thermocouple
surface.
Step 3
The microprocessor then allows the thermocouple temperature to be
controlled exclusively by the water condensing upon it. The heat
of the condensation causes the thermocouple temperature to rise,
converging upon the exact temperature at which condensation ceases.
This stable condition is achieved approximately one minute after
sample insertion.
Step 4
The point of temperature stability is the dew point temperature.
The final readout on the instrument display is proportional to the
dew point temperature depression with a resolution of 0.0003 °C.
Because dew point temperature depression is an explicit function
of vapor pressure, the instrument can be calibrated to report results
directly in Standard International units of osmolality, mmol/kg.
| Sample Volume |
10 µL nominal (Larger
samples or samples as small as 2 µL can be measured reliably
with special procedures) |
| Measurement Range |
Typically 0 to 3200 mmol/kg
@ 25° C ambient (up to 3800 mmol/kg with extended range
option) |
| Measurement Time |
75 seconds |
| Resolution |
1 mmol/kg |
| Repeatability Linearity
Readout |
Standard deviation = 2
mmol/kg, 2%of reading from 100 to 2000 mmol/kg, 10 X 6.8
cm LCD |
|
Operating Temperature
|
15 to 37° C ambient (instrument
should be at stable temperature before calibrating) |
| Calibration |
Automatic using Opti-mole™
osmolality standards (non-battery memory backup system) |
| Serial Output |
RS-232 (ASCII format) |
Electrical
Line Voltage: 100 to 120 V or 220 to 240 V nominal,
50 to 60 Hz (set at factory, user-selectable with fuse change)
Power: Less than 5 watts
Fuses: 1/8 amp time-delay type for 100/120 volts
(2 required) - 1/16 amp time-delay type for 220/240 volts (2
required)
|
| Height |
17 cm (6.6”) |
| Width |
29 cm (11.5”) |
| Depth |
34 cm (13.5”) |
| Weight |
3.6 kg (8 lbs) |
Buyer's
Specifications
The osmometer shall be a Wescor Model 5520 Vapor Pressure Osmometer
and shall operate on the vapor pressure depression principle.
The osmometer shall be capable of routine osmolality determinations
on sample volumes of 2-10 microliters and shall perform the
measurement automatically once the sample has been loaded. The
osmometer shall be capable of routine osmolality determinations.
The osmometer shall consume no more than 30 watts of electrical
power and shall weigh less than 4 kg. |
| Cat. No. |
Item |
| W-5520
|
Vapro Vapor
Pressure Osmometer with AC-066 Head for 0-3200 mmol/kg range
Base Price includes the following;
• OA-010
Optimol Osmolality Ampoule Standard, 100 mmol/kg (1 package)
• OA-029 Optimol Osmolality Ampoule Standard,
290 mmol/kg (1 package)
• OA-100 Optimol Osmolality Ampoule Standard,
1000 mmol/kg (1 package)
• AC-061 Ampoule Organizer for Osmolality
Standards and Control(1 each)
• SS-003 Cleaning Solution, for manual
thermocouple cleaning (1 bottle)
• SS-006 Deionized Water (60 mL dropper
bottle) (1 bottle)
• SS-033 Sample Discs (vial of 5000) (1
vial)
• SS-036 Micropipettor Disposable Tips
for AC-024 and AC-037 (1 package)
• AC-037 Micropipettor, 10 UL (1 each)
• OM-275 Hex Driver, 9/64 inch, screwdriver
handle (1 each)
• OM-300 Forceps, 5 inch, stainless steel
(1 each)
• V-1003 or V-1001 Thermocouple Cleaning
Video (1 each)
• Illustrated User's Manual
• One-Year Parts & Labour Warranty
|
| 5520XR
|
Vapro Vapor
Pressure Osmometer with AC-067 Head for above 3200 mmol/kg range
Base price includes the same accessories as the W-5520 listed
above. |
| Accessories
& Supplies |
| AC-037
|
Micropipettor,
10 UL |
| AC-061
|
Ampoule Organizer
for Osmolality Standards and Control |
| RP-076
|
Thermocouple Head
Assembly , model 5500 REBUILT - this item must be exchanged
with original head assembly - otherwise an additional fee will
be charged |
| RP-173
|
Thermocouple Head
Assembly , model 5520 REBUILT - this item must be exchanged
with original head assembly - otherwise an additional fee will
be charged |
| OM-275
|
Hex Driver, 9/64
inch, screwdriver handle |
| OM-300
|
Forceps, 5 inch,
stainless steel |
| 121275
|
Vapro Printer Cable |
| AC-062
|
Standard Sample
Holder, 7 mm x 1.25 mm deep, models 5520, 5500, 5100C |
| Special
Purpose Sample Holders for small and gross samples |
| AC-063
|
Sample Holder for
2 UL Samples, 4.25 mm dia. x 1.12 mm deep, models 5520, 5500,
5100C |
| AC-064 |
Sample Holder,
7 mm dia. x 2.5 mm deep, models 5520, 5500, 5100C |
| AC-065
|
Sample Holder,
9.5 mm dia. x 4.5 mm deep, models 5520, 5500, 5100C |
| AC-078
|
Sample Holder for
Kwikdisk 17-0643 O-RING for Standard Sample Holder |
| Osmometry
Standards/Controls |
| Optimol
Osmolality Ampoule Standards, 0.4 mL Vial (package of 60) |
OA-010
OA-029
OA-100 |
Optimol Osmolality
Ampoule Standard, 100 mmol/kg
Optimol Osmolality Ampoule Standard, 290 mmol/kg
Optimol Osmolality Ampoule Standard, 1000 mmol/kg |
| SS-039 |
Osmolality Control,
1 mL vial (package of 6) 2 high, 2 normal, 2 low
• High is approx 330 mmol/kg - lot specific
• Normal is approx 290 mmol/kg - lot specific
• Low is approx 270 mmol/kg - lot specific |
| SS-003
|
Cleaning Solution,
for manual thermocouple cleaning (60 mL dropper bottle) |
| SS-004
|
No longer available |
| SS-006
|
Deionized Water
(60 mL dropper bottle) |
| SS-026
|
Blow Clean |
| SS-033
|
Sample Discs (vial
of 5000) |
| SS-036 |
Micropipettor Disposable
Tips for AC-024 and AC-037 (package of 1000) |
| Manuals
& Instructional Materials |
| M2448
|
Vapor Pressure
Osmometer User's Manual, model 5500, 5500XR |
| M2468
|
Vapro Vapor Pressure
Osmometer User's Manual, model 5520 |
| M2469 |
Vapro Vapor Pressure
Osmometer Service Manual, model 5520 |
| V-1001 |
Thermocouple Cleaning
Video, model 5500, VHS Format (specify NTSC, PAL, or SECAM) |
| V-1003
|
Thermocouple Cleaning
Video, model 5520, VHS Format (specify NTSC, PAL, or SECAM) |
Canadian Customers if you
wish to speak to a sales representative or customer service, please
call Toll Free within Canada: 1-888-883-9101. Outside Canada, click
here for ordering information.
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 Downloadable Brochure:
 5520-Vapro
Vapour Pressure Osmometer - PDF Format (442 kb)
 
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