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BOSCH REXROTH
R928028411
Clogging Indicators

Clogging Indicators

BOSCH REXROTH

MATERIAL:  R928028411

SUMMARY:  Clogging Indicators

Due to extremely high demand, please call 888-651-5712 for availability

By default, the Rexroth filters are supplied with a mechanical/visual maintenance indicator (WO). The electronic switching element (WE) is available as accessory and compatible with all mechanical/visual maintenance indicators. The electronic switching element is attached to the visual maintenance indicator and fixed by means of a locking ring. The electronic maintenance indicator is not dependent on the nominal pressure of the filter.

The increasing back pressure and/or pressure differential pushes a piston (1) against a spring (2) upwards. The solenoid (3) mounted on the piston is moved together with the piston. The visual pin (4) may take two valid positions. If the position of the piston (1) with solenoid (3) is below the nominal pressure of the maintenance indicator, the visual pin remains in retracted “rest position”. Upon first exceedance of the nominal pressure, the position of the visual pin (5) is changed rapidly into the second possible “On condition” by repellence of the solenoid of the pin (5) to the solenoid of the piston (3). The pin will permanently remain in this extended position, even visible after machine switch-off (or pressure drop, cold start) (memory function). It has to be acknowledged.

The reed contact (6) integrated in the switching element is operated by the change in the magnetic field. With two switching points, two reed contacts are installed.

For the electronic switching element WE-2SPSU, the temperature for the temperature suppression is discharged via the housing of the mechanical/visual maintenance indicator.

The electronic switching element WE-2SPSU is not suitable for the mechanical/visual maintenance indicator made of polyamide (WO-S01-2.2-…-PA).

technical illustration-R928028411-Clogging Indicators

WE-2SP-M12x1
with mating connector (not including in the delivery)

technical illustration-R928028411-Clogging Indicators

WE-1SP-EN175301-803
with plug-in connection

technical illustration-R928028411-Clogging Indicators

01

02

03

WE

Series

01

Maintenance indicator, electronic switching element

WE

Type of signal

02

1 switching point

1SP

2 switching points, 3 LED

2SP

2 switching points, 3 LED and signal suppression up to 30 °C

2SPSU

Plug-in connector

03

Round plug-in connection M12x1, 4 pole

M12x1

Rectangular plug-in connection, 2 pole, design A according to EN-175301-803

EN175301-803

Type / version

WE-1SP-M12x1 WE-1SP-EN175301-803 WE-2SPU-M12x1 WE-2SP-M12x1

Electrical connection

Round plug-in connection M12x1, 4-pole Rectangular plug-in connection EN 175301-803 Round plug-in connection M12x1, 4-pole

Contact load, direct voltage

max.

A

1

Voltage range

max.

V DC

10 … 30 1)

Voltage

V AC

150 250

V DC

150 200

W

20 70 20

Switching type

Normally open contact
Changeover Normally closed contact

2SPSU

Signal interconnection at 30 °C,
Return switching at 20 °C
Stand-by (LED green);
75% switching point (LED yellow);
100% switching point (LED red)

Type of protection according to EN 60529

IP 67 IP65 IP 67

Ambient temperature range

°C

-25 … +85
1) For direct voltage above 24 V, spark extinguishing is to be provided for protecting the switching contacts.

Type / version

WE-1SP-M12x1 WE-1SP-EN175301-803 WE-2SPU-M12x1 WE-2SP-M12x1

Type of pressure measurement

Pressure differential

Operating temperature range

°C

-30 … +85

Ambient temperature range

°C

-25 … +85

Mass

kg

0.1 0.1

For applications outside these parameters, please consult us!

Pressure differential indicator with mounted switching element M12x1

Dimensions in mm

technical illustration-R928028411-Clogging Indicators

Pressure differential indicator with mounted switching element EN-175301-803

Dimensions in mm

technical illustration-R928028411-Clogging Indicators

1

Mechanical optical maintenance indicator; max. tightening torque MA max = 50 Nm

2

Switching element with locking ring for electrical maintenance indicator (rotatable 360°); M12x1, 4-pole round plug-in connection

3

Switching element with locking ring for electrical maintenance indicator (rotatable 360°); EN 175301-803 rectangular plug-in connection

4

Housing with three LEDs: 24 V =green: Stand-by
yellow: Switching point 75 %
red: Switching point 100 %

5

Optical indicator with memory function

6

16x1 DIN 471 locking ring, Material no. R900003923

7

Name plate

Notices:

Representation contains mechanical optical maintenance indicator (1) and electronic switching element (2) (3).

Connection of the electronic switching elements

By default, the filter is equipped with mechanical/visual maintenance indicator WO (4). The electronic switching element (2) is attached to the mechanical/visual maintenance indicator (1) and fixed by means of a locking ring (6).

What must generally be observed with Rexroth filters:

– Components must always be assembled without tension stress.

– The filter housing must always be grounded.

When has the filter element to be replaced or cleaned?

– The filter element is to be exchanged after initial commissioning of the system.

– Upon start-up in cold condition, the red pushbutton of the visual maintenance indicator (4) may jump out and an electrical signal is output via the switching element. Only push the red pushbutton in again after the operating temperature has been reached. If it jumps out again immediately or if the electric signal has not gone out at operating temperature, the filter element must be exchanged or cleaned respectively.

– The filter element should be replaced or cleaned after max. 6 months.

Use in potentially explosive areas according to directive 94/9/EC (ATEX)

According to DIN EN 60079-11, the electronic maintenance indicators WE-1SP-M12x1 are simple, electronic operating equipment not having an own voltage source. This simple, electronic operating equipment may - according to DIN EN 60079-14 - in intrinsically safe electric circuits (EEx ib) be used in systems for device group II, category 2G (zone 1) and category 3G (zone 2) without marking and certification. The operating equipment is assigned to explosion group II B and temperature class T5.

When using Rexroth filters in potentially explosive areas, equipotential bonding has always to be ensured.

Possible circuit according to DIN EN 60079-14

technical illustration-R928028411-Clogging Indicators