GHM Delta OHM HD404 Series, Operating Manual, Page: 5 / 24

HD404…
- 5 -
V1.2
2 TECHNICAL CHARACTERISTICS
Sensor Piezoresistive
Measuring range See tables 2.1 and 2.2
Resolution
0.1 Pa for HD404ST2…
0.5 Pa for f.s. up to 500 Pa (except Hd404ST2…)
1 Pa for f.s. 1000 Pa
0.1 mbar for HD404ST5…
0.05 mmH
2
O for f.s. up to 50 mmH
2
O
0.1 mmH
2
O for f.s. 100 mmH
2
O
0.002” H
2
O for f.s. up to 4” H
2
O
0.01 m/s (only SR versions)
Accuracy See table 2.1
Long-term stability See table 2.1
Output
•
HD404T…: Active analog 0…10 Vdc (R
Lmin
= 10 k
Ω
) or 4…20 mA
(R
Lmax
= 500
Ω
)
•
HD404ST…: Digital RS485 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…:
RS232 serial port
Can be connect to a USB port by using the optional CP27 adapter
• HD404ST…:
Can be connect 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% o 18…40 Vdc
•
HD404ST…: 12…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 mm
2
, PG9 cable gland
Operating conditions
-10...+60 °C (-5…+50 °C for the models with AZ option), 0…95% RH
Storage temperature
-20...+70 °C
Housing dimensions
80 x 84 x 44 mm
Protection degree
IP65