HD404T / HD404ST Series – Low Pressure Transmitters

Brand: Delta OHM S.R.L.

HD404T / HD404ST Series – Low Pressure Transmitters

Brand: Delta OHM S.R.L.
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 series uses a silicon “micro‑machined” type sensor compensated in temperature that has an excellent linearity, repeatability and stability over time. 

The output signal from the sensor is amplified and converted, depending on the model, into a standard current analog output (4-20 mA) and a voltage analog output (0-10 V), or into a digital RS485 Modbus‑RTU output, which, then, can be transmitted over long distances with a high immunity to noise.

In the models with analog output it is possible to choose, via a dip switch, between two measurement ranges in order to select the optimal scale for each application.
Features
  • Wide variety for any application
  • Great flexibility
  • Highly accurate & Reliable system
  • Immediate & Direct reading 
  • Easy to set up & Quick to install

Specifications

Sensor

  • Piezoresistive

Resolution

  • 1 Pa for f.s. 1000 Pa
  • 0.1 mbar for HD404ST5
  • 0.05 mmH₂O for f.s. up to 50 mmH₂O
  • 0.1 mmH₂O for f.s. 100 mmH₂O
  • 0.002” H₂O for f.s. up to 4” H₂O
  • 0.01 m/s (only SR versions)
  • 0.1 Pa for HD404ST2
  • 0.5 Pa for f.s. up to 500 Pa (except HD404ST2)

Output

  • HD404T: active analog 0 to 10 Vdc (RLmin =10 kΩ) or 4-20 mA (RLmax = 500 Ω)
  • HD404ST: digital RS-485 Modbus-RTU

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)

Overpressure Limit

  • 50 kPa

Connection to PC

  • HD404T: RS-232 serial port can be connected to a USB port by using the optional CP27 adapter
  • HD404ST: can be connected to a USB port by using the optional RS48 adapter

Zero Calibration

  • Automatic for the versions with AZ option

Compatible Media

  • Only air and non-aggressive dry gases

Power Supply

  • HD404T: 24 Vac ± 10 % or 18…40 Vdc
  • HD404ST: 12 to 30 Vdc

Absorption

  • HD404T: < 1 W @ 24 Vdc
  • HD404ST: < 100 mW @ 12 Vdc

Pressure Connection

  • Nickel-plated brass, Ø 6 mm

Electrical Connections

  • Screw terminal block, max. 1.5 mm2 , PG9 cable gland

Operating Conditions

  • -10° C to 60° C (-5° C to 50° C for the models with AZ option), 0 to 95 % RH

Protection Degree

  • IP65

Storage Temperature

  • -20° to +70° C

Models matching criteria: 129
Pressure transmitter, speed output.
Out of Stock
Pressure transmitter.
Out of Stock
Pressure transmitter, speed output.
Out of Stock
Pressure transmitter.
Out of Stock
Pressure transmitter, speed output.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of differential pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of differential pressure with respect to atmosphere.
Out of Stock
Transmitter of differential pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of differential pressure with respect to atmosphere.
Out of Stock
Transmitter of differential pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of differential pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of differential pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of differential pressure with respect to atmosphere.
Out of Stock
Transmitter of differential pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of differential pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of differential pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock
Transmitter of relative pressure with respect to atmosphere.
Out of Stock

  • Clean Room Monitoring
  • Filter Control
  • Flow Measuring
  • Air Conditioning Control
  • Ventilation Control

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