The 4250 single-sample cryoscope provides fast, accurate measurement of extraneous water in milk. Combining advanced features with simplified operation, this low maintenance, reliable high performance laboratory instrument supersedes the 4D3 and Fiske Mark 2 models. Up to 35 samples per hour can be measured and results can be displayed as desired and results can be collected on a computer or connected to a LIMS system.
The 4250 uses the industry standard thermistor freezing point method to precisely determine the level of extraneous water. With its on-board sample identification, broad measurement range and optimal sample size requirement, the 4250 provides accurate results compliant with ISO5764 plateau-seeking mode.
Quality management is improved by the 4250's unique key-switch, which allows the advanced set-up features and calibration modes to be locked out. In Operator Mode, routine testing can be accomplished with just two buttons, in Supervisor Mode, all operations are accessible.
The calibration procedure is quick and computer controlled. It will also detect and warn the operator if the calibration solutions are tested out of order. Settings are stored in a battery-protected memory. The 4250 also incorporates a new thermal printer.
Technical Specification
Sample Volume
2 or 2.5 mL
Test Time
Approximately 90 seconds in the 30-second timed mode
Sample Capacity
Single Sample
Units
-m°C or -m°H
Resolution
1 m°C or m°H
Range
0 to 1000 m°C or m°H
Communications
On-board printer, DTE RS-232 serial port, and optional barcode scanner
Performance at Reference Conditions*
- 20 to 25°C (68 to 77°F); 40 to 60% relative humidity; tolerances of reference or calibration solutions excluded:
Linearity - Less than ±0.5% from a straight line
Repeatability - ±2 m°C or m°H (1 S.D.)
Drift - Less than 1 m°C or m°H per month
Performance Over Operating Conditions
Temperature Effects - Less than 1 m°C or m°H per 5°C (9°F) ambient temperature change
Operating Conditions
Temperature - 18 to 35°C (64 to 95°F)
Humidity - 5 to 80% relative humidity, (non-condensing)
Storage Temperature - -40 to +45°C (-40 to +113°F)
Electrical
Voltage - 100 to 130 VAC (50/60 Hz) or 200 to 250 VAC (50/60 Hz)
Power Consumption
150 Watts
Dimensions
16.0” H x 13.0” W x 18.0” D (40.6 cm x 33.0 cm x 45.7 cm)
Net Weight
28.0 lbs. (12.7 kg)
Compliance
ISO5764
*Reference Conditions - 20 to 25°C (68 to 77°F); 40 to 60% relative humidity; tolerances of reference or calibration solutions excluded.
For further information on this product please contact the product manager, Jamie Duncan on 01342 820820 or email enquiries@qclscientific.com.
