
4/8 HEDE 10 | Pressure switch
Bosch Rexroth AG, RE 30277, edition: 2017-02
Technical data
(For application outside these values, please consult us!)
electric
Electrical connection M12 plug-in connection, gold-plated contacts
Input variables
Supply voltage U
B
18 to 30 VDC
Current consumption I < 50 mA
Isolation resistance mΩ >100 (500 VDC)
Output parameters
Analog output ▶ Current carrying capacity U 0 ... 10 VDC (minimum load 2000 Ω)
▶ Voltage I 4 ... 20 mA (max. load (U
B
– 10) x 50 Ω)
▶ Rise time (10 to 90 %) t 3 ms
Switching output ▶ Output function Normally open contact / normally closed contact programmable
▶ Current carrying capacity I 150; 200 (...60 °C); 250 (...40 °C) mA
▶ Voltage drop
U < 2.5 V short-circuit protection clocked
▶ Overload-resistant Yes
▶ Switching frequency f ≤ 170 Hz
Accuracy / variations
Characteristic curve deviation:
(according to end point setting DIN16086)
< ±0.5 %
Temperature coefficient in
nominal temperature range
▶ largest TK of the zero point 0.2 % / 10 k
▶ largest TK of the range 0.2 % / 10 k
Hysteresis < ± 0.25 %
Switching point accuracy < ± 0.5 %
Repetition accuracy 0.1 %
Programming options Hysteresis / window; normally open contact / normally closed
contact; activation, deactivation delay; damping; indicator unit /
diagnosis output
Long-term drift under reference conditions (6 months) 0.05 %
EMC ▶ EN 61000-4-2 ESD kV 4/8
▶ EN 61000-4-3 HF radiated V/m 10
▶ EN 61000-4-4 Burst kV 2
▶ EN 61000-4-5 Surge kV 1
▶ EN 61000-4-6 HF conducted V 10
Reaction times
Readiness delay time s 0.3
Min. reaction time switching output ms < 3
Adjustable delay time dS, dr s 0...50
Damping switching output (dAP) s 0...4
Damping analog output (dAA) s 0...4
Rise time analog output ms < 3
Watchdog integrated Yes
Switching cycles min. 100 million / 50 million with pressure rating 600 bar
Important information on hydraulic fluids:
▶ For more information and data on the use of other hydraulic
fluids, please refer to the data sheets above or contact us!
▶ There may be limitations regarding the technical valve data
(temperature, pressure range, life cycle, maintenance intervals,
etc.)!
▶ The flash point of the hydraulic fluid used must be 40 K higher
than the maximum solenoid surface temperature.
▶ Flame-resistant – containing water:
– Maximum pressure differential per control edge 50 bar
– Pressure pre-loading at the tank port >20% of the pressure
differential, otherwise increased cavitation
– Life cycle as compared to operation with mineral oil HL, HLP
50 to 100%
▶ Bio-degradable and flame-resistant: When using hydraulic fluids
that are simultaneously zinc-solving, zinc may accumulate
(700mg zinc per pole tube).