MP Filtri Differential Clogging Indicators

Description

MP Filtri Differential Clogging Indicators are technical devices used on the pressure line to verify the efficiency and wear condition of the filter element. The operating principle is based on the simultaneous measurement of pressure upstream (IN) and downstream (OUT) of the filter element itself. By detecting differential pressure, these indicators promptly signal when the critical clogging level is reached, allowing operators to schedule maintenance and prevent performance drops in the hydraulic circuit.

Design Features and Types

The MP Filtri Differential Clogging Indicators range is divided into four primary configurations to suit specific control architectures:

• Series DE: Electrical differential indicators, equipped with multiple wiring and connector options (including AMP Superseal, AMP Timer Junior, Deutsch, EN 175301-803, and IEC 61076-2-101 D).
• Series DL: Electrical and visual differential indicators, often equipped with transparent or black bases and integrated lamps at 24 Vdc or 110 Vdc for quick visual inspection.
• Series DT: Electronic differential indicators.
• Series DV: Purely visual differential indicators, supplied with automatic or manual reset systems and a two-state colored indication (green/red).

From a construction standpoint, standard sensors feature a brass body combined with a polyamide base. For highly corrosive environments and severe applications, models fully made of stainless steel (AISI 316L) are available. The standard mechanical interface includes special connections with G 1/2″ size.

Applications and Industries

These devices are designed for seamless integration across a wide range of filter housings, including return filters, suction filters, spin-on filters, low- and medium-pressure filters (such as LMP and LMD series), and high-pressure filters (FMP, FHP, FHM series). Stainless steel versions (DEX, DEZ, DLX, DLZ, DVX, DVZ series) are intended for high-pressure filters within the FZP, FZH, and FZX range, capable of withstanding maximum working pressures of 420 bar and peak pressures of 700 bar, specifically for the FZH series.

MP Filtri has also developed a dedicated line designed to operate safely in potentially explosive atmospheres. The DEH series features global certifications including ATEX, IECEx, EAC TR CU, and INMETRO, with protection options such as intrinsic safety (Ex ia IIC T4/T6) or flameproof (Ex d IIC T4/T6), covering temperature classes T4 (135°C) and T6 (85°C). To meet North American market requirements, configurations with UL/CSA certification (Class I Division 1, Class II Division 1) are also available.

Fluid Specifications and Operating Parameters

MP Filtri Differential Clogging Indicators ensure maximum reliability by guaranteeing full compatibility with mineral oils, synthetic fluids, and water-based hydraulic fluids (HFA, HFB, and HFC) in strict compliance with ISO 2943. To ensure optimal hydraulic sealing, the components use technical elastomer seals such as HNBR, FPM, or MFQ, selectable according to the fluid and thermal conditions. Operating temperatures cover a standard range from -25°C to +110°C. Specialized variants for hazardous areas maintain excellent performance under demanding conditions, extending the range from -60°C up to +125°C.

The robust construction is also reflected in environmental protection ratings: indicators start from IP65, IP66, and IP67 specifications, reaching up to full-sealing levels IP68 and IP69K (according to EN 60529 and ISO 20653). Engineering safety margins are equally high, with burst pressures reaching 1260 bar for standard models and up to 2100 bar for specialized 700 bar stainless steel versions.

Technical summary table of the main features of MP Filtri Differential Clogging Indicators.