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Filter replacement alarm system with integrated minihelic pressure gauge, light and buzzer | 2625-54B-SS displayed
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Product Group:
6601-PP-30
6601-PP-30 77987

Filter Replacement Alarm System for Fan Filter Units

  • Available Certified ISO Grade Designs: ISO 6, ISO 7, ISO 8
  • Filter replacement alarm keeps your fan filter units working safely and efficiently
  • 1 Filter Replacement Alarm unit covers for all FFUs in your cleanroom
  • Receive automatic replacement alerts to avoid costly and unexpected operational interruptions
  • Prevent electrical/fire hazards caused by overworked motors pushing against overloaded HEPA filters
  • Control differential pressure set-point to adjust frequency of filter replacement

• Certified ISO Grade Design: ISO 6

• Unit of Measure: of 1

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Manufactured By: Terra Universal
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120 V Audible & Visible 2625-54B-SS 70757 $1,455 1-3 Days 2
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120 V Email, Audible, & Visible 2625-54C-SS 84259 $2,204 1-3 Days 3
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Up to 30-day trial periods, free return shipping and on-site training available for qualified equipment.

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Custom-configured product. Contact Terra by phone, chat or email for a project-specific quote.
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Product Details
Product Details
  • Available Certified ISO Grade Designs: ISO 6, ISO 7, ISO 8
  • Filter replacement alarm keeps your fan filter units working safely and efficiently
  • 1 Filter Replacement Alarm unit covers for all FFUs in your cleanroom
  • Receive automatic replacement alerts to avoid costly and unexpected operational interruptions
  • Prevent electrical/fire hazards caused by overworked motors pushing against overloaded HEPA filters
  • Control differential pressure set-point to adjust frequency of filter replacement
  • Includes audible buzzer with silencer that sounds when set point level is exceeded
  • Factory set to issue a warning alarm when pressure reaches twice the initial backpressure (typically 1.5"" WC), indicating need for filter replacement (adjustable 0.5"" - 2"" WC)
  • Alarm unit connects to one FFU equipped via challenge port and signals when all filters are ready to be replaced
  • TUI Logo flashes when the HEPA or ULPA filter needs to be replaced
  • Integrated Minihelic gauge displays the backpressure within the fan/filter unit
  • Monitoring system’s control box is typically mounted above the cleanroom control panel
  • Module draws power from the cleanroom PDM or can be connected to a standard 120V outlet (order power outlet cord adapter separately)"
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• Certified ISO Grade Design: ISO 6

• Unit of Measure: of 1

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Fan Filter Units

  • Terra Universal WhisperFlow® Filter Fan Units Terra Universal WhisperFlow® Filter Fan Units
  • Cleanroom HEPA or ULPA Fan Filter Unit WhisperFlow Cleanroom HEPA Fan Filter Unit
  • Stainless Steel WhisperFlow Fan and Filter Units Stainless Steel WhisperFlow Fan and Filter Units, 2' x 4'
  • EC HEPA Fan Filter Unit Smart WhisperFlow Fan Filter Unit with EC Motor
  • Room Side Replaceable Fan Filter Units (FFUs) Room Side Replaceable WhisperFlow® Fan Filter Units (FFUs)
  • Explosion-Proof Softwall Cleanroom Explosion-Proof Softwall Cleanroom
  • 2' x 4' Ducted HEPA Filter Unit Ducted HEPA Filter Unit, 2' x 4'
Terra Universal WhisperFlow® Filter Fan Units
Overview video of Terra Universal's comprehensive portfolio of filter fan units Terra Universal WhisperFlow® Filter Fan Units Overview video of Terra Universal's comprehensive portfolio of filter fan units
Cleanroom HEPA or ULPA Fan Filter Unit
WhisperFlow Fan Filter Units (FFUs) provides a uniform flow of microfiltered air to meet cleanliness standards down to Class 10/ISO 4 | 6601-24-H displayed WhisperFlow Cleanroom HEPA Fan Filter Unit WhiperFlow Fan FIlter Units features internal baffling and adodized an aluminum diffuser that provide uniform air speed across the filter face for ISO-compliant laminar flow of HEPA or ULPA-filtered air.
Stainless Steel WhisperFlow Fan and Filter Units
Stainless Steel WhisperFlow® Fan/Filter Units feature a corrosion-resistant, ultra-smooth housing for aseptic facilities | 6601-24-USS displayed Stainless Steel WhisperFlow Fan and Filter Units, 2' x 4' Stainless Steel Fan/Filter Units feature a corrosion-resistant, ultra-smooth housing, filter frame and diffuser with ULPA filter for aseptic facilities requiring frequent sterilization; WhisperFlow® blffling system promote uniform air velocity across filter face.
EC HEPA Fan Filter Unit
Smart WhisperFlow® Fan Filter Units feature electronically commutated motors for energy efficiency, quiet operation and remote speed control | 6601-24-H-EC displayed Smart WhisperFlow Fan Filter Unit with EC Motor Smart WhisperFlow® Fan Filter Units feature electronically commutated (EC) motors for improved energy efficiency, low noise, remote speed control and pressure balancing.
Room Side Replaceable Fan Filter Units (FFUs)
Room-Side Replaceable (RSR) WhisperFlow™ Fan/Filter Units allow filter replacement from inside of the cleanroom | 6601-24A-HR displayed Room Side Replaceable WhisperFlow® Fan Filter Units (FFUs) Room-Side Replaceable (RSR) WhisperFlow™ Fan/Filter Units allow HEPA or ULPA filter replacement from inside of the cleanroom; WhisperFlow® baffle system and anodized aluminum diffuser promote uniform air velocity across filter face.
Explosion-Proof Softwall Cleanroom
This Class I, Division 1 softwall cleanroom features explosion-proof fan/filter units connected with sealed conduit to explosion-proof junction boxes Explosion-Proof Softwall Cleanroom This Class I, Division 1 softwall cleanroom features explosion-proof fan/filter units connected with sealed conduit to explosion-proof junction boxes.
2' x 4' Ducted HEPA Filter Unit
Ducted filter unit provides uniform flow of HEPA- or ULPA-filtered air to an enclosure (requires remote air handler) | 6601-24-HD displayed Ducted HEPA Filter Unit, 2' x 4' Ducted filter unit provides HEPA- or ULPA-filtered air to an enclosure (requires remote air handler). WhisperFlow baffling system ensures uniform face velocity (2 x 4 model shown).
Features & Benefits

Features and Benefits

Learn More: Filter Replacement Alarm System
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Filter Replacement Alarm System

  • Keep your fan/filter units working efficiently
  • Receive automated filter replacement alerts
  • Prevent electrical or fire hazards
  • Control filter set-point
  • Plan ahead to avoid operational interruptions

Knowing when to replace a HEPA or ULPA filter can be challenging. Terra's Filter Replacement Alarm can help! The module monitors the back-pressure of the filter and alerts cleanroom personnel when replacement is needed.

FFU motor damage may occur from over-work due to building pressure, and even lead to electrical failure or dangerous fire hazards. Filter replacement is much more economical than FFU replacement or room rewire, and doesn't require time-consuming operational shutdown.

How does it work? Pressure within the space between the blower and the filter will increase over time as more and more particles accumulate in the filter. The system's Photohelic® gauge features two manually adjustable needles that are used to mark the original backpressure reading and the maximum acceptable level (typically double the backpressure reading of a new filter).

The gauge connects to the nearest fan/filter unit (FFU) equipped with a Challenge Port (Part #6601-99) and displays the backpressure created within the FFU. An LED indicator light above the gauge will flash, and a buzzer will sound, when the pressure exceeds this set limit. Personnel are then notified that the room's HEPA or ULPA filters should be replaced. An override switch silences the buzzer, but the light continues to flash until the filter is replaced.

Complete Project Transparency

Terra is dedicated to complete transparency on project status, shipment tracking, and installation scheduling

Complete Order Transparency

Using Terra’s OnTrak system, our customers can view real-time production updates, receive shipment notifications and track their orders until they arrive at their facility

Products Compliant With Your ISO Rating

High-capacity, durable, ISO-compliant system rated for thousands of operating hours.
Available Accessories
Popular Accessories
For a full list of accessories, select a product then click Choose Accessories on that product page.
  • Energy-Efficient LED Lighting Panels

    Energy-Efficient Lighting

    Energy-efficient LED lighting panels and strips help to lower electrical costs and minimize heat build-up in temperature-controlled environments.
  • Power Distribution Modules for Cleanroom FFUs, Lights

    Power Distribution Modules for Cleanroom FFUs and Lights

    UL-listed power distribution modules include all breakers, transformers and other electrical components for FFU/light connections; allows fast addition or relocation of FFUs or lights without the need for rewiring.
  • Ionizing Bar Installed on Cleanroom Fan/Filter Unit

    Ionizing Bar; 22"L, with Installation Kit, for 24 x 24 Fan/Filter Unit

    Ionizing bar, mounted to Fan/Filter Unit, provides a balanced stream of ions to the work area below to neutralize static charge and prevent electro-static discharge; 22" bar shown installed on 2' x 2' FFU.
  • Night Service Swtich for Clean Room Fan Filter Units

    Night Service Saves Energy, Extends Filter Life!

    Night service switch, shown mounted on Modular Hardwall Cleanroom panel, puts FFUs in low-energy mode during off-hours; saves 25% of fan operating costs and extends filter life.
  • Filter Replacement Alarm for Fan Filter Unit

    Filter Replacement Alarm

    The filter replacement alarm monitors filter backpressure and issues an alarm when filter needs replaced (requires selection of fan filter unit with challenge port, order separately).
  • Fan Filter Unit Power Cord Adapter

    Cord Adapter, MIN4 PL to 16AWG Power Cord for Terra Fan/Filter Unit

    Four-pin power cord adapter for fan/filter unit allows connection to standard 120VAC/60Hz power receptacle.
  • Fan Filter Unit Mounting Frame, for Ceiling Installation

    FFU Mounting Frame; Stainless Steel

    Stainless steel Fan Filter Unit (FFU) mounting frame supports FFU on drywall or other rigid ceiling material, viewed from above ceiling panel (FFU not included).
  • Fan Filter Unit Control System

    Fan Filter Unit Control System

    Provides room-by-room monitoring and control of Smart WhisperFlow FFUs to maintain target pressure differentials for ISO classification; temperature, humidity and particle monitoring and data logging, as well as dynamic fan set-point control, also available.
  • ceiling cover panels to help spray down cleanroom ceilings

    Filter Covers Allow Ceiling Wash-Down

    Ceiling panel covers allow wash-down and sterilization of cleanroom walls and ceilings without damage to filter medium; requires BioSafe glass or stainless steel wall panels, which stand up to biocides.

  • Challenge Port for Fan Filter Unit

    Challenge port for Fan/Filter Units simplifies filter leak testing and connection of Filter Backpressure Alarm (shown with optional pressure gauge; must be ordered with FFU).
  • Horizontal laminar flow wall module with 2 HEPA fan filter units mounted on a base stand

    Safely Mount FFU’s Above Floor for Horizontal Laminar Airflow

    The portable FFU base stand can be easily positioned to supply Class 100 horizontal laminar flow into a room or enclosure. It can also be positioned next to sensitive equipment/materials that are mounted close to the floor.
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