Mid West Model 123 Piston Type Differential Pressure Gauge
Aluminium Body
123-AA-02-OO
3,000 PSIG Working Pressure, aluminum body, 316 stainless steel piston, ceramic magnet, Viton® seals, ¼” FNPT end connections, engineered plastic dial case with shatter-resistant acrylic lens, 2½” round dial. Accuracy ±2% full scale (ascending).
Other Body Materials:
Stainless Steel Body (123-SS-02-OO): 5,000 PSIG Working Pressure
Brass Body (123-BS-02-OO): 3,000 PSIG Working Pressure
Special order required for alternate materials; contact CMC.
3,000 PSIG Working Pressure, aluminum body, 316 stainless steel piston, ceramic magnet, Viton® seals, ¼” FNPT end connections, engineered plastic dial case with shatter-resistant acrylic lens, 2½” round dial. Accuracy ±2% full scale (ascending).
Other Body Materials:
Stainless Steel Body (123-SS-02-OO): 5,000 PSIG Working Pressure
Brass Body (123-BS-02-OO): 3,000 PSIG Working Pressure
Special order required for alternate materials; contact CMC.
Model 123 2.5 Inch Dial
Model 123 Electrical Switch
Product Features and Benefits
- High-performance piston gauge in the Model 120 series, delivering ±2% full-scale accuracy (ASME B40.1 Grade B)
- Robust construction with magnetically coupled internal piston and external rotary pointer for differential pressure indication
- Corrosion-resistant materials suitable for demanding industrial environments
- Weatherproof design standard; NEMA 4X rating with shatter-resistant acrylic lens and engineered plastic dial case
- Available dial sizes: 2½”, 3½”, 4½”, and 6″ diameters
- Multiple scale options: PSID, bar, kPa, dual scale, and custom scales available
- Working pressure: Up to 5,000 PSIG (stainless steel); 3,000 PSIG (aluminum/brass) with over-range protection
- Operating temperature range: -40°F to +250°F (-40°C to +121°C)
- ¼” FNPT end-mounted process connections for easy installation
- Multiple seal options: Viton®, Buna-N, Teflon®, Neoprene, and Ethylene Propylene for fluid compatibility
- Optional electrical switches: One or two hermetically sealed reed switches with adjustable set points
- All switch options CE/UKCA marked and RoHS compliant
- Five-year limited warranty
DP Range And Accuracy
Standard DP Ranges: 0-5 PSID to 0-500 PSID (0-0.35 bar to 0-34.5 bar)
Special ranges available upon request
Special ranges available upon request
- Accuracy: ±2% full scale (ascending)
- Leakage: Does not exceed 25 SCFH air at 500 PSID (ambient conditions)
Model 123
Model 123 in 4.5 Inch Dial
Common Applications
- Chemical processing systems
- Oil & gas instrumentation
- High-pressure hydraulic/pneumatic systems
- HVAC and refrigeration monitoring
- Process control and flow measurement
- Marine and offshore applications
Additional Options
- Reversed high/low process connections
- Liquid fill (glycerin or silicone)
- Maximum indicator follower pointer
- Oxygen cleaning service
- Stainless steel identification tags
- Wall mount kits
- Custom scale configurations
Standards & Certifications
- ASME B1.20.1
- ASME B40.100
- NACE MR0175
- NEMA Std. No. 250
- CSA C22.2 No. 14, 25, and 30
- SAE J514
- EN-61010-1
- UL Std. No. 50, 508, and 1203
Model 123 Rear View
Additional Services
Custom Dial Face
Personalised dial faces tailored to your specifications.
Tagging Service
Services include stainless steel tags with wire or screw options.
Calibration Report
Calibration and accuracy certification from Mid-West or CMC.
Modification Service
Modification of existing stock units to for specific dial and electrical requirements.