Products Catalog

Specification

HD 2004T and HD 20V4T are microprocessor pressure transmitters, the former having a current output (4÷20 mA) and the later having a voltage output (0÷5V, 1÷5V or 0÷10V).
The sensitive element consists of a bridge of piezoresistive resistances laid
on a ceramic diaphragm. When changing the applied pressure, the bending of this diaphragm causes a linear and proportional change of the bridge resistances.
The stainless steel case (30 mm diam.) includes both the sensor and the electronics:
unscrewing the base equipped with faston connectors, you can reach
the keys to adjust the upper and the full scale. A LED helps the user during
the calibration procedure. A ¼� BSP threaded connection and an opening
in on the case for a 27 mm wrench are provided to connect the transmitter
with the plant under pressure. On the other side, a 3/4-pole (depending on
models) male faston connector, the relevant female outlet and a PG7 cable
gland according to DIN 43650 are provided to grant the electrical links.
Technical Specifications
Output Signal Current 4...20 mA (HD 2004T...)
Voltage 0...5V (HD 20V4T... 1), 1...5V (HD 20V4T... 2), 0...10V (HD 20V4T... 3)
Pressure range
1, 2.5, 4, 6, 10, 16, 25, 40, 60, 100, 160, 250, 400 and 600 absolute bars
1, 2.5, 4, 6, 10, 16, 25, 40, 60 relative bars
Overpressure limit Up to 250 bars Twice the rated value
400 nominal bars 750 bars
600 nominal bars 750 bars
Sensor Piezoresistive
Material in contact with the measuring fluid Alumina
Fluid in contact with the diaphragm Gas or liquids
Operating temperature -30...+80°C
Power supply voltage
10...30Vdc
(15...30Vdc for models having 0...10Vdc output)
Zero and full scale adjustment ±10% through up, down and enter)
Accuracy (linearity, hysteresis and repeatability)
±0.4%F.S. Gain sensitivity to temperature changes (@ 25°C)
±0.008%F.S. between 0 and 70°C
±0.012%F.S. between -30°C and 0°C
and between 70°C and 80°C
Zero sensitivity to temperature changes
(@ 25°C) d ±0.04%F.S.
Connection to plant under pressure ¼�BSP male
Electrical connection 3/4 -pole faston male connector
+ DIN 43650 female connector (outlet)
Housing AISI 304 stainless steel
Size Ø 30x90 mm (included DIN 43650 connector)
Weight 190 g
Load resistance for HD 2004T models...
(see Fig.2) RLmax = 636 © a 24 Vdc RLmax = (Vdc - 10)
22mA
Load resistance for HD 20V4T models... RL e 10K
Response time 1 sec. (Time required to achieve the 63%
of the final variation)
Protection class IP54
The passive pressure transmitters of the HD 9408T... series convert the pressure variation exerted on a flexible diaphragm into a two-wire proportional and linear 4÷20 mA signal.
The sensitive element is a bridge of piezoresistive resistances laid on a diaphragm of special ceramic material. The bending of the diaphragm leads to a variation in the resistances that is proportional to and linear with the pressure applied. The quality of the materials and the technology used allow the creation of elements that are very precise, reliable and repeatable over time.
The sensitive element is housed inside a container made of stainless steel,
diameter 30x70 mm., containing the pressure sensor and the electronics; at
the base there is an opening for a 27 mm wrench, while the threaded part for connecting the pressurized system is ¼� BSP. On the opposite side, the transmitter is equipped with a three-pole circular metal connector according to DIN 41524 and two multiturn trimmers which allow setting the upper and full scale of about ±5% of their value.
Technical Specifications
Output Signal 4…20 mA
Pressure range
2.5, 4, 6, 10, 16, 25, 40, 60, 100, 160, 250, 400 and 600 absolute bars 250, 400, 600 relative mbars
1, 2.5, 4, 6, 10, 16, 25, 40, 60 relative bars
Resolution Infinite
Overpressure limit Up to 250 bars Twice the rated value
400 nominal bars 750 bars
600 nominal bars 750 bars
Sensor Piezoresistive
Material in contact with the measuring
fluid
Alumina, AISI 316 for models 250, 400
and 600 relative mbars
Fluid in contact with the diaphragm Gas or liquids
Operating temperature -10...+70°C
Storage temperature +20...+80°C
Power supply voltage 9...30Vdc , maximum ripple 4Vpp
Zero and full scale adjustment ±5% by two trimmers
Accuracy
(Linearity, hysteresis and repeatability) ±0.4%F.S.
Temperature compensation 0...80°C
Connection to plant under pressure ¼�BSP male
Electrical connection Male three-pole circular connector according to DIN 41524
Housing AISI 304 stainless steel and Viton
Size / Weight Ø 30x70 mm / 190 g
Load resistance RLmax = (Vdc - 9)
22mA
Response time 0.5 sec. (Time required to achieve the 63% of the final variation)
Assembly position Any
Fixing wrench 27 mm