PRESSURE TRANSMITTERS 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. Tutti i dati ed i contenuti di questa scheda sono di proprietà esclusiva di Riels Instruments 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. Mechanical dimensions 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 resistance Operating temperature Storage temperature Compatible elements Overpressure limit Pressure connection Electric connection Case Case size Protection degree 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 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

Ordering codes Tutti i dati ed i contenuti di questa scheda sono di proprietà esclusiva di Riels Instruments Examples of connections with the HD9022 and DO9404 indicators/regulators