Differential pressure transmitters HD408 Riels0 pages

HD408T

PRESSURE
TRANSMITTERS

PRESSURE

Relative or differential atmospheric pressure transmitters
The HD408T, HD4V8T are analog output relative or differential atmospheric pressure
transmitters; they are used in all those applications where non corrosive air or gas need to be
monitored, with pressure fi elds from 10 mbar to 2000 mbar.
The piezoresistive sensor gives extremely precise and stable measurements of the applied
differential pressure, with excellent repeatability, low hysteresis, and very good temperature
stability.
The output signal of the sensor is conditioned to provide either a current output (model
HD408T) or a voltage output (model HD4V8T) linearly proportional to the applied
differential pressure.
The transmitters are ready to use as they have been calibrated at the factory.
They are used to monitor clean room barometric pressure, to control fi lters, to measure
flows (employment with the Pitot tube), for packing and packaging machines, and to control
ventilation.

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Installation
In all models the sensor and electronic parts are housed in a robust case in MACOLON with
IP67 degree of protection. Opening the cover, the holes that allow to secure the transmitter’s
base directly to a panel or a wall, become available. HD408T, HD4V8T can be mounted in
any position, the deviation of the zero due to the mounting position is in the worst case (10
mbar range) less than 1% F.S. and can be accessed from outside, for pressures up to 100mbar.

HD408T

Mechanical dimensions

HD4V8T

Technical information @ 20°C and 24Vdc
HD408T
Sensor
Measurement range
Output signal
Precision
Resolution
Temperature effects
Time stability
Startup time
Response time
Power
Absorption
Load resistancet
Operating temperature
Storage temperature
Compatible elements
Overpressure limit
Pressure connection
Electric connection
Case
Case size
Protection degree

HD4V8T

Piezoresistive
10, 20, 50, 100, 200, 500, 1000, 2000 mbar
±10, ±20, ±50, ±100, ±200, ±500, ±1000, ±2000 mbar
0 … 10 Vdc standard;
4 … 20 mA
0 … 5 Vcc, 1 … 5 Vcc on request
±0,5 % f.s. @ 20°C
Infinite
< 1% f.s., zero; <1% f.s., span da –20°C a +60°C (-4° a 140°F)
< 1 % f.s. over 6 months at 20°C
1 sec. at 99% of full scale reading
< 10 ms until it reaches the stated precision by applying a step pressure level
16 … 40 Vdc or 24 Vca with output / 0 … 10 Vcc /
8 … 30 Vcc
10 … 40 Vcc or 24 Vca with outputs / 0 … 5 Vcc, 1 … 5 Vcc
< 4 mA
20 mA @ 20°C, 24 Vcc
RLmax = 727 Ω a 24Vcc
RLmax = Vcc-8
Minimum input resistance 10kΩ
ttt
22 mA
-20 ... +60°C
-20 ... +80°C
air and dry gases only
350mbar for the models 10, 20, 50, 100 mbar / 3X f.s. for all the other models
With Ø 5mm flexible tube
Screw terminal box
MACROLON
64 x 58 x 34
IP67

Riels Instruments Srl

+39 049 8961771

+39 049 717368 www.riels.it info@riels.it