RA 50 050/6.98 - Airline Hydraulics

RA 50 050/6.98
Bourdon Tube Pressure Switch Infinitely Variable
Switching Pressure Differential
Model HED 3, Series 3X
– Bourdon tube type pressure
– with or without light
Replaces: 50 050/6.96
and 30 173
K 3287/8
K 3284/1
up to 5800 PSI (400 bar)
RA
50 050/6.98
– several electrical connections
– lockable adjustment optional
– highly resistant to contamination
– SAE straight thread port connection
– highly accurate
– no internal leakage (Bourdon tube)
– variable pressure differential, selectable via
two independent adjustments
K 3287/10
HED 3 OA 3X/..Z..
K 3287/6
K 3287/3
HED 3 OA 3X/..
HED 3 OA 3X/..L..
HED 3 OA 3X/..Z6..
HED 3 OA 3X/..ZL..Q
Functional description, symbol
Pressure switches Model HED3 are bourdon tube actuated
switches. Particularly suited for sustained pressure, and resistant
to contamination, bourdon tube switches are highly accurate.
They consist of a housing (1), bourdon tube (2) striker plate (3), 2
micro switches (4) and 2 adjustment screws (5).
The pressure signal acts upon bourden tube (2). As pressure
increases, bourdon tube (2) expands and attached lever (3)
transmits the expansion of bourdon tube (2) to a linear movement
to activate micro switch (4). The electrical circuit is switched on or
off, dependent on field wiring. If pressure continues to rise,
bourdon tube (2) continues to bend, and the second micro switch
is actuated by lever (3). The second circuit is switched dependent
on field wiring.
1
2
4
Adjustment of the Switching Pressure
The two switching pressures are determined by the position of the
micro switches, which are adjusted independently by screws (5).
The switching pressure differential is variable, and fully adjustable.
Symbol
5
P
3
P
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RA 50 050/6.98
Ordering code
HED 3 OA 3X
*
Further details t be written in clear text
Series 30 to 39
(30 to 39: externally interchangeable)
No Code =
12 =
= 3X
max. adjustment pressure ... 365 PSI (25 bar)
max. adjustment pressure ... 915 PSI (63 bar)
max. adjustment pressure ... 1450 PSI (100 bar)
max. adjustment pressure ... 2900 PSI (200 bar)
max. adjustment pressure ... 5800 PSI (400 bar)
G (BSP) threaded connections
SAE threaded connections
No Code =
Q 1) =
= 25
= 63
= 100
= 200
= 400
No Code
L24
L110
L220
=
=
=
=
without lockable cap
with lockable cap
without light
light for 24V (20V to 35V)
light for 110V (90V to 130V)
light for 220V (180V to 220V)
No Code =
Z=
conduit connection
plug-in connection plug,
4 pins + ground
plug-in connection plug,
DIN 43 651 6 pins + ground
Z6 =
1)
Key part # 006 980
Technical data (For operation outside these parameters, please consult us!)
Fluid
Mineral oil (HL, HLP) to DIN 51 524, Phosphate ester (HFD-R),
Gas, air (for corrosive fluids, please consult us)
°F (°C)
Fluid temperature range
2
SUS (mm /s)
Viscosity range
NBR seals –22 ... 158 (–30 ...70); FPM seals –4 ... 158 (–20 ...70)
60 ... 3710 (10... 800)
Switching accuracy
< ± 1 % of pressure setting range
Switching frequency
... 30 cycles/min.
Setting ranges [all details in PSI (bar)]
Max.
Pressure
rating
operating
pressure
in PSI (bar)
Variable switching
pressure differential
over the entire
setting range
in PSI (bar)
Falling pressure
Rising pressure
in PSI (bar)
in PSI (bar)
minimum
maximum
minimum
maximum
365 (25)
435 (30)
14.5 ... 340 (1...23.5)
22 (1.5)
365 (25)
36 (2.5)
375 (26)
915 (63)
1015 (70)
29.0 ... 855 (2 ... 59)
58 (4)
915 (63)
87 (6)
945 (65)
1450 (100)
1600 (110)
43.5 ... 1365 (3 ... 94)
87 (6)
1450 (100)
130 (9)
1495 (103)
2900 (200)
3050 (210)
116 ... 2755 (8 ... 190)
145 (10)
2900 (200)
260 (18)
3015 (208)
5800 (400)
6090 (420)
175 ... 5510 (12 ... 380)
290 (20)
5800 (400)
365 (32)
5975 (412)
Electrical connection
conduit connection Pg 11 [max. cable dia. 0.43 in (11 mm)]
(Parts supplied as loose items)
Connection
– conduit connection
in2 (mm2)
... 3.9 x 10–3 (2.5)
section
– plug connection
in2 (mm2)
... 2.3 x 10–3 (1.5)
Contact loading
– AC voltage
380 V; 10 A
– DC voltage
25 V; 1.0 A or 125 V; 0.2 A or 250 V; 0.1 A
DC voltages, arc suppression is recommended to increase service life.
Insulation to DIN 40 050
Weight
Exceeds NEMA class B (IP 65)
lbs (kg)
1.8 (0.8)
Notes on application of bourdon tube pressure switches
Bourdon tube pressure switches should be shock mounted to avoid mechanical vibrations.
To compensate for pump pulsation, we recommend the use of small diameter hoses 0.1" (2 mm), approximately 3.28 ft (1 meter)
long for pressure switch connection.
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RA 50 050/6.98
Switching examples
R(P)
max.
1 Pressure
min.
Pressure
Switch 1
1
p
p
4
2
4
2
1
p
Switch 2
p
4
2
6
R(P)
max.
1
min.
2
3
1
4
2
Control
Light
Working
Working
Relay
Relay
4
S(N)
S(N)
5
GND
Differential switching
with N.C. contacts
Differential switching
with N.O. contacts
Pressure switch
(One HED 3 switch)
(One HED 3 switch)
(HED 3… SO16 switch)
Connection positions
Electrical connection "ZA"
Electrical connection"ZLA"
Electrical connection "Z6A"
Electrical connection "Z6LA"
(plug-in connection to DIN 43 651)
4
1
p
PE
2
2
3
4
4
2
4
1
1
PE
PE
1
2
1
p
2
2
3
4
1
2
1
2
1
1
4
PE
p
2
2
3
4
4
5
2
6
4
1
2
p
2
2
3
4
1
2
4
1
1
1
5
2
6
4
1
1
Connect light according to circuit required
Unit dimensions (optional electrical connections): dimensions in inches (millimeters)
16 Space required to remove angled
connector
2.44 (62)
1.85 (47)
15
14 16
Pg 11
HED 3 OA 3X/..L..
14
0.79
(20)
0.6 (15)
0.55 (14)
1.65 (42)
1.69 (43)
14 16
0.73 (18.5)
15 Connection Z or Z6, plug may be
rotated in increments of 30°
0.8 (20)
HED 3 OA 3X/..Z6L..
2.83 (72)
0.87 (22)
15
2.01 (51)
Pg 11
Pg 11
14 Light
0.57 (14.5)
HED 3 OA 3X/..ZL..
2.60 (66)
16
0.8 (20)
0.55 (14)
0.73 (18.5)
15
2.64 (67)
Pg 11
2.44 (62)
1.85 (47)
2.64 (67)
1.69 (43)
16
1.65 (42)
15
0.6 (15)
2.60 (66)
2.01 (51)
HED 3 OA 3X/..Z6..
2.83 (72)
0.87 (22)
HED 3 OA 3X/..Z..
0.57 (14.5)
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RA 50 050/6.98
2.60 (66)
Unit dimensions: dimensions in inches (millimeters)
4.29 (109)
4.17 (106)
3.543 (90)
0.3 (7)
11
1.201
(30.5)
1.260
(32)
0.315 (8)
0.71
(18)
Pg 11
Ø 0.011 (11)
SAE-4;
7/16-20 (G 1/4")
/0.51 (13) deep
1.850 (47)
0.807 (20.5)
1.97 (50)
5.1
9
5.2
1.240 (31.5)
1.713
(43.5)
7
0.591 0.315 (8)
(15)
1.732 (44)
2.913 (74)
3.54 (90)
0.236 (6)
10
1.220
(31)
0.47 (12)
6
8
1.14 (29)
3.66 (93)
1.38
(35)
Ø 0.276 (7)
0.3 (8)
1.634
(41.5)
1.378
(35)
1.40
(35.5)
5.1 Adjustment screw with lock nut, for switch 1
→ lower switching pressure
5.2 Adjustment screw with lock nut, for switch 2
→ upper switching pressure
6 Pressure port P
0.0004/4.0 in
0.01/100 mm
32
(Rmax 4)
7 Nameplate
8 Lockable cap, optional
9 Space required to remove key
Required surface finish
interface when mounting the
valve without our subplate
10 2 mounting holes
11 Electrical connection for conduit connection
Mannesmann Rexroth Corporation
Rexroth Hydraulics Div., Industrial, 2315 City Line Road, Bethlehem, PA 18017-2131 Tel. (610) 694-8300 Fax: (610) 694-8467
Rexroth Hydraulics Div., Mobile, 1700 Old Mansfield Road, Wooster, OH 44691-0394 Tel. (330) 263-3400 Fax: (330) 263-3333
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All rights reserved – Subject to revision
Printed in U.S.A.

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