Dräger P3U - Page 88

Technical Data
88
Signal transmission to central unit
Analogue
— Measured-value signal 4 mA to 20 mA
— Drift below zero point 3.8 mA to 4 mA
— Full-scale value exceeded 20 mA to 20.5 mA
— Unit fault <3.2 mA
— Maintenance signal 3.4 mA
Options which can be switched on or off:
— Warning Fault signal for 1 second every 10 seconds
1)
1)
Can be configured as desired. Factory setting: disabled.
2)
Actual supply voltage at the transmitter.
Digital HART compatible,
transmission on two- or three-wire, shielded cable
Analogue (4 to 20 mA) signal transmission (2-wire)
— Supply voltage (w/o pump or relay module)
— for a current of 3 mA 16.5 V DC to 30 V DC
— For a current of 22 mA min. 8.0 V DC at the transmitter
— AC component <0.5 V
SS
Analogue (4 to 20 mA) signal transmission (3-wire)
— Supply voltage — 12 V DC to 30 V DC (w/o pump or relay module)
— AC component <0.5 V
SS
— Load resistance 0 ohm to 40 [ohm/volt] x (U
S
2)
– 4 V)
Digital signal transmission (2-wire) 16.5 V DC to 30 V DC
— AC component <0.2 V
SS
; <2.2 mV
eff
(500 to 10 000 Hz)
— Load resistance 0 ohm to 40 [ohm/volt] x (U
S
2)
– 4 V)
Digital signal transmission (3-wire)
— supply voltage 12 V DC to 30 V DC (w/o pump or relay module)
— AC component <0.2 V
SS
— load resistance 230 ohm to 40 [ohm/volt] x (U
S
2)
– 4 V), max. 600 ohm
Digital signal transmission (4-wire)
— supply voltage 12 V DC to 30 V DC (w/o pump or relay module)
— AC component <0.2 V
SS
— load resistance 230 ohm to 40 [ohm/volt] x (U
S
2)
– 4 V), max. 600 ohm
PROFIBUS PA
— Communication rate 31.25 kBaud
— Data volume 244 Byte
— Bus length max. 1900m
— Segment size max. 32 slaves
— Physical layer IEC 61158-2; digital, bit-synchronous, Manchester Encoding
— Segment current 18.1 mA
Foundation Fieldbus:
— Communication rate 31.25 kBaud
— Data volume 128 Byte
— Bus length max. 1900m
— Segment size max. 240 nodes
— Physical layer IEC 61158-2; digital, bit-synchronous, Manchester Encoding