. Features Filter elements are economically used only if their dirt holding capacity is fully exploited. This is achieved by using filter housings with a maintenance indicator. MAHLE manufactures maintenance indicators of the following designs: Differential pressure indicators Pressure indicators/switches/gauges Vacuum switches/gauges With any filter element the collection of dirt particles continously reduces the of open pores or, in other words: The open cross for allowing the liquid to flow is continously reduced. Thus the pressure on the upstream side of the element (dirt side) increases continously. With pressure filters, the pressure is measured upstream and downstream of the filter element (differential pressure). With return line filters the pressure is measured only on the upstream side because, depending on the tank design, atmospheric pressure exits on the downstream side of the filter element is measured analog. With suction filters the vacuum is measured downstream. A piston with attached magnet is moved against the force of a spring, with which the indicating point is determined by the piston surface. A homopolar poled magnet is fitted in the outer part in the indicating button. The closer the polesprings move towards each other, the stronger is the force with the magnets mutually repel, until finally the red button on the indicator pops out. This red button remains visible until it is pushed in during the daily check which is to be performed while the plant is at operating temperature. If the button pops out immediately after being pushed in, the filter element must be replaced latest at the end of the shift. This optical function may also be used for generating contactless signals. For this purpose an upper part is pushed over the hydraulic/optical part. This upper part incorporates all switching elements. Optical and indicator with standard check function Normally open/normally closed combination standard feature Electrical function, easy to install at a later time Twostep indication, at 7 % and 00 % optional Signal lock out up to approx. 0 C optional Rugged, nonbypass design Optimal element exploitation Worldwide distribution
. Differential pressure indicators Fig. Fig. Fig. Fig. 0* = 0 mm wide Differential pressure indicators Nominal pressure Temperature [ C] 0 0 +0 0 0 0 +0 0 +0 0 0 +0 0 0 +0 0 0 +0 PiS 07 7770 PiS 0 7777 PiS 0 Indicator setting Indication Contact type* Fig. + a 7 + a PiS 0 777 PiS 07 77 + a PiS 7007 + a PiS M 770 0 PiS 70 + a PiS 0 70 PiS 770 PiS 77 PiS 770 PiS 700 PiS 7 770 PiS 0 77 PiS 07 7 PiS 0 77 PiS 07 77 PiS...7/. + a + a 700 + a PiS 700 + a PiS 0 707 PiS 7 77 PiS 77077 PiS 777 PiS 777 PiS 700..0.7/.0 lower Al Al Al Al Al Al upper
Differential pressure indicators Nominal pressure 00 00 00 Temperature [ C] 0 +0 0 +0 0 +0 PiS 0 77 PiS 0 77 PiS 700 PiS 0 00 0 0 0 +0 0 +0 0 +0 Fig. + a + a 77707 + a PiS 0 77 PiS 770 PiS 777 PiS 77 PiS 700 PiS 77 PiS 0 77 PiS 0 77 + a + a 7700 0 PiS 0 7770 + a PiS 0 777 PiS 700 PiS 770 PiS 77 PiS 77 PiS 770 PiS 0 770 PiS 0 777 + a PiS 700 + a PiS 770 PiS 70 + a PiS 0 77 7 PiS 70 PiS 70 + a PiS 0 7 7 PiS M 0 +0 Indication Contacttype* PiS 00 Indicator setting 700..7/..0.7/.0..0 lower CuZn CuZn CuZn CuZn CuZn.0.0 upper *Contact type Normally open/normally closed; setting point; wiring box DIN EN 700; max. 0 V AC/00 V DC; max. A Normally closed; setting points; wiring box DIN EN 700; max. 0 V; max. A Changeover contact; setting point; wiring box DIN EN 700; max. 0 V; max. A Changeover contact; setting points; LED; Mercedes Benz Norm DBL EA; wiring box DIN EN 700; max. 00 V; max. A Changeover contact; setting points; LED; signal surpression; time delay; wiring box DIN EN 700; 00 V; max. A Changeover contact; setting points; LED; signal surpression; wiring box DIN EN 700, 00 V; max. A 7 Analog signal 0 ma; setting points; LED; signal cold start; wiring box DIN EN 700; V; max. A Normally open/normally closed; setting points; LED; signal surpression; plug connection Mx; 00 V; max. A Normally open/normally closed; setting points; LED; plug connection Mx; 00 V; max. A 0 Changeover contact; setting point; plug connection Mx; 0 V; max. A Normally closed/normally closed; setting points; LED; plug connection Mx; 0 V; max. A
. Pressure indicators/pressure switches Fig. Fig. Fig. 7 Fig. 0* = 0 mm wide Pressure indicators/pressure switches Nominal pressure Temperature [ C] 0 0 +0 0 0 0 0 0 0 0 +0 0 +0 0 +0 + + + PiS 0 777 PiS 0 7707 PiS 700 PiS 0 70 PiS 0 7770 PiS 0 77770 PiS 0 7770 PiS 700 PiS M Indicator setting Indication Contact type* Fig. + a + a + a + a + a + a 7777 0 7 + 7a PiS 70070 opt./elektr. 7 + 7a PiS 77 7 + 7a PiS 77 + a PiS 77 7 + 7a PiS 7707 + a PiS 0 700 + a PiS 0 7770 + a DSS/. 77 DSO/. 77707 DSS/. 77 DSO/. 7770 DSS/ 77 DSO/ 77700. 0./...7/....0 lower upper galvanized steel delivered with protection cap norm. open n. closed norm. open n. closed norm. open n. closed *Contact type see remarks below. Differential pressure indicators
. Vacuum/pressure gauges Fig. * = Green area/* = Red area Fig. 0 Fig. * = Metering level Vacuum/pressure gauges Nominal size [NG] 77 0 Vacuum gauge 0 0 Pressure gauge Indicating range 770 +0. Connection size Fig. R/ conical G/ Class Dial face Red/Green area sep. line 0. bar 777 0 R¼ conical 0 7 0 R¼ conical min.. white Red/Green area sep. line. bar. Vacuum switches Fig. *G = Connection Fig. HES/HEO only for fluids, LES/LEO only for air Vacuum switches Permissible overpressure Temperature [ C] 0. 0 +70 PiS 070 HES 00 BP 0. 0 +0 shortterm +0 Switch setting[mbar] 770 0 777 0 00 70 00 ±0 single pole changeover switch, snapin joint 7000 normally closed LES 0 I 70 normally open LEO 0 I 70 Fig. normally closed Connection *G lower upper GDAl GDZnAl PC G¼ normally open HEO 00 BP 0 ± Contact type G/ G/ outside M0x inside
. Vacuum indicators/air filters Fig. * = Indication: position of display in mbar *V = Version *V = Version Vacuum indicators/air filters Indicator setting Temperature [ C] TB 7 0 +0 ±0 % [mbar] 700 0 TB 7/ 700 0 TB 7/ 700 Indication type Fig. Version optical self loccking 7. Accessories 7. Seal kits NBR FPM EPDM PiS 0, 0, 0, 0,,,,,,,, PiS 0, 07, 0,,,,,,, 77707 7770 7770 Designation Electrical upper normally closed with signal surpression PiS 00, 07, 0, 0, (acc. to DIN EN 700) 7777 Electrical upper changeover contact Mxfür 770 PiS 0, 07, 0, 0, (contact type 0) 77700 77707 7770 7 Electrical upper SPLEDMxSU (contact type ) spare part for setting points indicator! 7 PiS 0, 0, 0, 0,,,,,, 7 70 70 Electrical upper SPLEDMx (contact type 700 ) spare part for setting points indicator! 770 PiS 0, 07, 0 7770 7770 Electrical upper WSPLEDSUVERZ (contact type ) spare part for setting points indicator! Electrical upper WSPLEDSU (contact type ) spare part for setting points indicator! 70 7. Electrical expansion kit/spare parts Designation Electrical upper WSP/ÖLEDMx (contact 77 type ) spare part for setting points indicator! 770 Electrical upper normally closed with signal surpression PiS 00 7777 Wiring box with lamp insert 0 V for upper normally open (acc. to DIN EN 700) 777 707 Electrical upper normally open with signal surpression PiS 00 Electrical upper changeover contact for PiS 0, 07, 0, 0, (contact type ) 7007 Wiring box with LEDs 0 0 V for upper change over contact (acc. to DIN EN 700) 700 Electrical upper normally open/closed for PiS 0, 07, 0, 0, (contact type )
7. Mounting block for differential pressure indicators 7. Protection cap (M0x.) Designation Mounting block (St) 7700 Mounting block (.0), 0 bar 777 Designation Protection cap for all pressure and differential pressure indicators, 0 C to +0 C Resistant to: gasoil, purifying agent, insolation, dust, salt, water, concret 70 R = clean side S = dirt side. Function The magnetic field as previously described, contactless operates reed contacts in the upper part. The desired contact type is selected by inverting upper part. Another option keeping the signal electronically suppressed up to 0 C operating temperature is also available. This eliminates false signal during the cold start phase. For efficient servicing it is desirable to have a prewarning device (so that the filter element can be replaced, e.g. with the next tool change). For this purpose upper parts with two indicating points, i.e. at 7 % and at 00 % of the indicator setting are available. Pressure/vacuum gauges give an analog reading of the existing state of contamination of the filter elements. They require continous control to ensure that the service time and reserve capacity are not unduly exceeded. If the contamination signal is disregarded, the filter element may collapse or, if a bypass valve is installed, part of the contamination fluid may reach the hydraulic components via the bypass valve and cause failure of the hydraulics. Pressure/vacuum switches are provided with snap action switches, which ascertains that signal are issued only when the limit values have been fully reached. Dirt holding capacity p curve x = dirt holding capacity [g] y = differential pressure p * = signal step maintenance indicator 00 % * = signal step maintenance indicator 7 % 7
. Technical specifications. Contact type normally open/normally closed. Contact type normally closed or open with signal suppression Contact type s PiS 0, 0, 0, 07, Contact type normally closed PiS 00 (expansion kit) Contact type normally open PiS 00 (expansion kit) 0 V AC/ 00 V DC A 70 W IP in inserted and normally open/normally closed M0x. DIN EN 7 00 Contact type : Cable sleave: Wiring box: The switching function can be changed by turning the electric upper part by 0 (normally closed contact or normally open contact). The state on delivery is a normally closed contact. By inductivity in the direct current circuit the use of suitable protection circuit should be considered. Electrical parts are insulated (plastic Signal suppression by thermorelay Signal is released at +0 C for further technical details see. material housing).. Contact type normally closed setting points Contact type s PiS 0, 0,. setting point at 7 % of the indicating pressure. setting point at 00 % of the indicating pressure 0 V AC/DC A 0 VA/0W for further technical details see.. Contact type Changeover contact Contact type s PiS,, 0 V AC/DC A 0 VA/0W for further technical details see.
. Contact type changeover contact, setting points LED Contact type s PiS 0, 0, 0, 0. setting point at 7 % of the indicating pressure. setting point at 00 % of the indicating pressure 0 0 V DC A 0 VA/0 W of protection IP in inserted and. Wiring box with insert lamp Will be suplied instead of standard connection. Not to be combined with indicators with setting points. 0 V AC/DC DIN EN 700.7 Contact type changeover contact, setting points, LED, signal suppression, time delay Contact type s PiS,,. setting point at 7 % of the indicating pressure. setting point at 00 % of the indicating pressure 0 0 V DC A 0 W IP in inserted and DIN EN 700 Signal suppression: by thermorelay Signal released: at + 0 C Signal change down: at + 0 C Impulse surpression K and K time delay 0 s. Contact type changeover contact, setting points, LED, signal suppression Contact type s PiS,,. setting point at 7 % of the indicating pressure. setting point at 00 % of the indicating pressure 0 0 V DC A 0 W IP in inserted and DIN EN 700 Signal suppression: by thermorelay Signal released: at + 0 C Signal change down: at + 0 C LED * = Operating LED green LED * = Setting point 7 % LED yellow LED * = Setting point 00 % LED red
. Contact type analog 0 ma, setting points, LED, signal.0 Contact type normally open/normally closed, setting suppression Contact type 7 s PiS 0, 0 points, LED, signal suppression Contact type s PiS,,. setting point at 7 % of the indicating pressure (normally open) Output signal: Outputs (PNP, max. 00 ma): Signal damping: V DC IP in inserted and nach DIN EN 700 0 ma cold start signal 7 % setting point 00 % setting point 0 s. Contact type normally open/normally closed, setting points Contact type PiS,,. setting point at 7 % of the indicating pressure (normally open). setting point at 00 % of the indicating pressure (normally closed) 00 V DC A 0 W IP in inserted and Mx, pole. setting point at 00 % of the indicating pressure (normally closed) Signal suppression: Signal release: Signal change down: IP in inserted and Mx, pole by thermorelay at + 0 C at + 0 C. Contact type changeover contact Contact type 0 PiS Mx, Mx, Mx 0 V A 0 W IP in inserted and Mx, pole LED * = Operating LED green LED * = Setting point 7 % LED yellow LED * = Setting point 00 % LED red 0
. Contact type normally closed, setting points. Vacuum switch HES/LES Contact type s PiS 7,,. setting point at 7 % of the indicating pressure (normally open). setting point at 00 % of the indicating pressure (normally Contact type normally open closed) 00 V DC A 0 W IP in inserted and Electrical connection: Contact load HES*: Contact load LES*: AMP, DIN bushings DIN 7 switch type pole V/ W V/ W IP with protecting cap Mx, pole * at resistive load LED * = Operating LED green LED * = Setting point 7 % LED yellow LED * = Setting point 00 % LED red. Vacuum switch HEO/LEO Contact type normally closed Contact load HEO*: Contact load LEO*: V/ W V/ W * at resistive load. Vacuum switch PiS 070 Contact type pole changeover contact Electrical connection: for further technical details see. Position of installation: AMP, DIN bushings DIN 7 0 V AC/DC A IP 00 without cover IP with cover individual (position of installation is to be adviced if setting pont is adjusted) = Supply line = Operating contact = Normally closed contact = Adjusting screw
.7 Pressure switch DSS Contact type Electrical connection: Duty classification:. Pressure switch DSO normally open AMP, DIN bushings DIN 7 Contact type normally closed for further technical details see.7 switch type pole V A 00 VA 00/min Maintenance indicators PiS 0, 07, 0, 0, can be mounted in. We draw attention to the fact that all values indicated are average values which do not always occur in specific cases of application: Our products are continually being further developed. Values, dimensions and weights can change as a result of this. Our specialized departement will be pleased to offer you advice. When using our filters in areas which are to be classified according to EU directive / EG (ATEX), we recommend prior discussion with us. The standard version can be used for liquids based on mineral oil /corresponding to the fluids in Group of Directive 7/ EG Articlel ). Please consult with us if using other media. Subject to technical alterations without prior notice. MAHLE Industriefiltration GmbH Schleifbachweg D7 Öhringen Phone + (0) 7/70 Fax + (0) 7/7 industrialfiltration@mahle.com www.mahleindustrialfiltration.com 77.0/0