Model 555
(Tri-Color)

Diaphragm Type

Differential Pressure Indicator

Model 555 Diaphragm Type Differential Pressure TRI-COLOR Indicator is designed for determining the state of an in-line filter. Colored bands allow you to quickly identify pressure drop across element. Divided into three sections, each clearly marked for ease of understanding. Filtration systems require monitoring to maintain a level of performance specified by the manufacturer for the continued expectations of the end user. Commonly used to indicate when to change or clean a filter Model 555 is suited for filter applications, line loss, valve drop, and many other differential pressure applications where a simple indicator is needed. Model 555 is available with a Full scale accuracy of ±5%

(0-3.5 PSID to 0-43 PSID)

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Product Features/Benefits

  • Simple Diaphragm Design
  • Corrosion Resistant
  • Over-Range Protection, High over Low and Low over High
  • 3/8"-24 UNF Mounting Bolts, Spaced 1.75"; Process connection thru the Mounting Bolts (O-ring seal)
  • 1 Year Warranty
  • For complete model details See Bulletin_555_OEM.pdf

Specifications / Configuration

  • 2 Sided Dial Indication
  • Dial Scale Ranges: 0-3.5 PSID to 0-43 PSID
  • Differential Full Scale Ascending Accuracy ±5% (ASME B40.1 Grade D)
  • Working Pressures up to 300 PSIG (20 Bar)
  • Operating Temp -40°F to +200°F (-40°C to +93°C)
  • Material of Construction of Body – Glass Filled Nylon (GFN) (Wetted Part)
  • Internal wetted parts-Stainless Steel, Ceramic Magnet, and GFN
  • Elastomers: Buna-N and Viton.
  • For complete specifications see: Bulletin_555_OEM.pdf

Common Applications

  • Filter Monitoring
  • Strainer monitoring

Additional Options:

  • No additional options as standard are available please contact your sales coordinator for special requirements

The Mid-West Advantage

OEM Indicators “Piston Type”

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 126 0-5 PSID to 0-20 PSID ±5% 3,000 PSI Available CE Marked to LVD & RoHS N/AN/A
Model 127 0-25 PSID to 0-100 PSID ±5% 3,000 PSI Available CE Marked to LVD & RoHS Directives N/AN/A

OEM Indicators “Diaphragm Type”

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 146 0-3 PSID (0-50" H2O) to 0-30 PSID ±5% 1,000 PSI Electrical Enclosures Weather-Resistant, NEMA 4X N/AN/A
Model 444 0-5 PSID to 0-30 PSID ±5% 300 PSI None available N/AN/AN/A
Model 522OEM 0-5 PSID to 0-50 PSID ±5% 1,000 PSI Available CE Marked to LVD & RoHS Directives, SPST & SPDT Switches N/AN/AN/AN/A
Model 555Tri-Color 0-3.5 PSID to 0-43 PSID ±5% 300 PSI Not Available N/AN/A