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Rosemount Model 444 Alphaline Temperature Transmitters
5-2
Output Limits (approximate)
Models 444RL, T, MV
Low: 3.9 mA dc.
High: 30.0 mA dc.
Model 444LL
Low: 0.1 V dc.
High: 4.2 V dc.
Model 444LM
Low: 0.125 V dc.
High: 6.2 V dc.
Power Supply
Models 444RL, T, and MV
12 to 45 V dc at terminals of transmitter.
Model 444LL
5 to 12 V dc (overvoltage protected to 24 V dc)
max current = 1.5 mA.
Model 444LM
8 to 12 V dc (overvoltage protected to 24 V dc)
max current = 2.0 mA.
Load Limits
Models 444RL, T, and MV
4–20 mA.
Span and Zero
Continuously adjustable, as defined in the ordering table. Adjustments are
accessible from the terminal side of the transmitter housing.
Transmitter Temperature Limits
–13 to 185 °F (–25 °C to 85 °C), transmitter operates within specifications.
–40 to 212 °F (–40 °C to 100 °C), transmitter operates without damage.
–58 to 248 °F (–50 °C to 120 °C), storage.
–13 to 149 °F (–25 °C to 65 °C), transmitter operates within specifications for
meter option.
Loss of Input
Upscale burnout indication standard for RTD inputs, downscale burnout
indication optional. Upscale burnout indication standard for thermocouple and
millivolt inputs; downscale burnout indication or no indication optional.
Turn-on Time
2 seconds. No warm-up required.
Load (Ohms)
Operating
Region
1650
1500
1000
500
0
4–20 mA dc
12 20 30 40
Power Supply (V dc)
Maximum Load = 50 ϫ (Supply Voltage – 12)
Voltage
Too Low