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Appendix B
Model 4250 Specifications
1 Reference Conditions: 20 to 25°C (68 to 77°F); 40 to 60% Relative Humidity; tolerances of reference or calibration solutions excluded.
Serial Suffix A - C
Applies to Serial Suffix A - C. Refer to 4250 Design Changes for more information.
Electrical:
Voltage: 100 to 130 VAC (1.2 A) or 200 to 250 VAC (0.6 A)
Frequency: 50 or 60 Hz
Fuses: 250V time delay (Type T):
2-Amp time delay for 100-130 VAC
1-Amp time delay for 200-250 VAC
Power: 150 Watts
Memory Backup: integral lithium cell; 10 years life (typical);
(not user-replaceable)
Sample Volume: 0.2 or .25 mL
Sample Capacity: single sample
Readout: 20-character vacuum fluorescent display
Units: m °C or m °H
Range: 0 to 1000 m °C or m °H
Resolution: 1 m °C or m °H
Communications: Onboard printer, DTE EIA-232/V.24 (RS-232) serial port and optional
barcode scanner
Performance at Reference Conditions
1
Linearity: Less than ±0.5% from a straight line
Repeatability:
±2 m °C or m °H (1 SD) between 0 and -400 m °C
± 0.5% (1 SD) between -400 and -1000 m °C
Drift: Less than 1 unit per month
Performance Over Operating Conditions
Temperature Effects: Less than 1 unit for every 5°C (9°F) ambient temperature change.
Operating Conditions
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