Model 555 (OEM)
(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)
Contact Us Today For AvailabilityProduct 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 +150°F (-40°C to +65.6°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
- 1 year warranty
- 30 + Years Hazardous Location product manufacturer.
- OEM and Private Label Capabilities
- Fast on-time Deliveries
- Friendly Customer Support
- Certified Quality System CSA B51-09 SAI GLOBAL
Model 555 (OEM)Documents

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/A | N/A | ||
Model 127 | 0-25 PSID to 0-100 PSID | ±5% | 3,000 PSI | Available CE Marked to LVD & RoHS Directives | N/A | N/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/A | N/A | ||
Model 444 | 0-5 PSID to 0-30 PSID | ±5% | 300 PSI | None available | N/A | N/A | N/A | |
Model 522 (OEM)OEM | 0-5 PSID to 0-50 PSID | ±5% | 1,000 PSI | Available CE Marked to LVD & RoHS Directives, SPST & SPDT Switches | N/A | N/A | N/A | N/A |
Model 555 (OEM)Tri-Color | 0-3.5 PSID to 0-43 PSID | ±5% | 300 PSI | Not Available | N/A | N/A |