User's Manual

7ML19985JE03 SITRANS LR250 (HART) – INSTRUCTION MANUAL Page 7
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Specifications
Specifications
Power
• Maximum 30 V DC
• 4 to 20 mA
• Max. startup current see
Startup Behavior on page 141
Performance
Reference operating conditions according to IEC 60770-1
• ambient temperature +15 to +25 °C (+59 to +77 °F)
• humidity 45% to 75% relative humidity
• ambient pressure 860 to 1060 mbar g (86000 to 106000 N/m
2
g)
Measurement Accuracy (measured in accordance with IEC 60770-1)
• Maximum measured error = 5 mm (0.2") (including hysteresis and non-
repeatability)
Frequency K-band
Max. measurement range
1)
20 m (65.6 ft) except for 1.5" horn which has 10 m
(32.8 ft)
Min. detectable distance 50 mm (1.97") from end of horn
2)
Update time
3)
minimum 1 second, depending on settings for
Response Rate (2.4.1.) and LCD Fast Mode (4.9.)
Influence of ambient temperature < 0.003%/K (average over full temperature range,
referenced to maximum range)
Note: Siemens Milltronics makes every attempt to ensure the accuracy of these
specifications but reserves the right to change them at any time.
General Purpose
Non-incendive (FM/CSA US/Canada only)
Intrinsically Safe
Nominal 24 V DC at 550 Ohm
Flameproof
Increased Safety
Explosion-proof (FM/CSA US/Canada only)
Nominal 24 V DC at 250 Ohm
1)
From sensor reference point: see Dimensions on page 12 and Flanged Horn with
extension
on page 14.
2)
Minimum range is horn length + 50 mm. See Dimensions on page 12.
3)
Reference conditions: Response Rate (2.4.1.) set to FAST, LCD Fast Mode (4.9.)
set to ON.