HI Clogging Indicator for Pressure Filters

Pressure Filters have a wide range of clogging indicators available. If no indicator is specified, the port is sealed by a plug (HI-O). The clogging indicators are actuated by the differential pressure (Δp) across the element. The special piston design minimizes the effects of peak pressures in the system. An optional thermal lockout (thermo-stop) is available to prevent false indication under cold start conditions. Fluid temperature have to be at least +20 °C/+68 °F for the indicator to function.

Plug Type HI-O and visual Clogging Indicators Type HI-A and HI-V

Technical Data

Materials

• Body: Stainless Steel
  The visual clogging indicators are available in the following configurations:
• Manual reset:
  The indicator continues to display the clogged signal even through the Δp may have fallen. Pressing the plastic cover down will reset the indicator.
• Automatic reset:
  The clogged signal will disappear when the Δp drops below the setting for the indicator

Electrical and Visual-electrical Clogging Indicators Type HI-E, HI-ED and HI-P

Technical Data

Materials

• Body: Stainless Steel

Alarm outputs

• HI-E: electrical
• HI-ED: electrical
• HI-P: visual-electrical (LED red and green)

Electrical

• Plug according to DIN-EN 175301-803 A (DIN 43650-A).
• Screwed cable gland PG11
• Protection rating (DIN 40050) IP65
• Both NO and NC contacts are available
• Deutsch plug

Note: The customer/user carries the responsibility for the electrical connection. 

Double Visual-electrical Clogging Indicator HI-D024

The differential pressure indicator HI-D024 is a microprocessor controlled pressure switch with two alarm outputs for pre-alarm and shut-off. It is used to monitor the capacity of oil filters in oil-circulating systems. For this purpose, a micro-processor controlled pressure sensor observes the dynamic pressure in front of the filter element or the differential pressure at the filter element. The pressure increases depending on the cumulative clogging of the filter. To avoid false alarms due to high viscosity during start-up, the device is equipped with a temperature control and time delay function.

Technical Data

Connection Thread

• G1/2

Operating Pressure

• Max. 420 bar/6000 PSI

Temperature Range

• -20 °C to +80 °C/-4 °F to +176 °F
• ready for operation > 20 °C/68 °F

Materials

• Body: Brass
• Sealing Material: NBR (Buna-N®)

Protection Rating

• IP 67

Rated Capacity

• Max. 0,2 A, 24 VDC

Operating Voltage

• 24 VDC

Alarm outputs (electrical)

• 3,8 + 10% bar/55.1 +/- 10% PSI
  ∆p = 75% (Pin 4)
• 5 + 10% bar/72.5 +/- 10% PSI
  ∆p = 100% (Pin 2)