Detailed Product Description

The low-powered Model 444 is compatible with solar or
battery-powered systems. A nominal 24V dc power supply is no
longer required. The Model 444LL operates on 512 V dc; the
Model 444LM operates on 812 V dc. The substantial reduction in
power consumption makes these temperature transmitters an
ideal choice for remote location. The electronic circuit boards used
in these transmitters work on a lower supply voltage and provide a
voltage output that is linear with temperature. These boards are
not interchangeable with the standard Model 444.
SPECIFICATIONS
Functional
Input
100-ohm platinum RTD
Zero and Span Adjustability
Base Temperature
25 to 50 °F (32 to 10 °C)
Spans
Minimum: 75 °F (42 °C)
Maximum: 150 °F (83 °C)
Outputs
Model 444LL: 0.8 to 3.2 volts
Model 444LM: 1.0 to 5.0 volts
Power Supply
Model 444LL: Supply ranges 5 to 12 V dc
Model 444LM: Supply ranges 8 to 12 V dc
Indication
No meter available
Loss of Input
Upscale burnout indication only
Current Consumption
Model 444LL: 1.5 mA
Model 444LM: 2.0 mA
Performance
Accuracy
±0.2% of calibrated span. Includes linearity, hysteresis, and
repeatability.
Ambient Temperature Effect
±0.7% of calibrated span per 50 °F (28 °C) change in ambient
temperature.
Power Supply Effect
±0.05% per volt
Over-voltage Protection
Unit capable of sustaining a 24 V supply across the signal
terminals without damaging the transmitter.
Certifications
E7 Flameproof:
Ex d IIB+H2 T6
Class I, Zone 1.
DIP T6
Class II.
Centro Elettrotecnico Sperimentale Italiano
(CESI/CENELEC) Certifications
E8 Flameproof:
EEx d IIC T6
I8 Intrinsic Safety:
Model 444RL
EEx ia IIC T6 (Tamb = 40 °C) [Pi = 0.75 W]
EEx ia IIC T5 (Tamb = 55 °C) [Pi = 1.0 W]
EEx ia IIC T4 (Tamb = 80 °C) [Pi = 1.0 W]
Model 444T
EEx ib IIB T6 (Tamb = 40 °C) [Pi = 0.75 W]
EEx ib IIB T5 (Tamb = 55 °C) [Pi = 1.0 W]
EEx ib IIB T4 (Tamb = 80 °C) [Pi = 1.0 W]