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Pressure
Pressure Transmitter: Very Low Relative and Differential Pressure
The series of HD404T transmitters is able to measure relative pressures with reference to the atmosphere or differential in the range:
• from 50 to 1000 Pa (from 0.2” H2O to 4” H2O) for the versions with analog output;
• 250 Pa / 1000 Pa / 100 mbar for the versions with RS485 Modbus-RTU output.
The transmitters use a “micromachined” temperature compensated silicon sensor that has excellent linearity, repeatability, and stability over time.
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Key Specifications
Sensor
Piezoresistive
Resolution
See data sheet
Accuracy
See data sheet
Output
Active analog 0 to 10 Vdc or 4-20mA | digital RS485 Modbus-RTU (Output dependant on model type)
Overpressure limit
50kPa
Supply Voltage
HD404T…: 24 Vac ± 10% or 18…40 Vdc HD404ST…: 12…30 Vdc
Pressure Connections
Nickel-plated brass for 6mm ID tubing
Response Time
HD404T… with dip-switch set to FAST: 0.125 s in pressure mode 1 s in speed mode (only SR versions) HD404T… with dip-switch set to LOW: configurable 1, 2 or 4 s (default 2 s) HD404ST… configurable 0.125, 1, 2 or 4 s (default 2 s
Available Accessories
Available Accessories
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Calibration and service is available for this item.
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