Analog pressure gauge YB

panel-mountBourdon tubeprocess

Overview
The YB Series precision pressure gauges from YUNYI are mechanical reference instruments intended for calibration and high-accuracy online pressure measurement. Designed as metrological standards, they comply with GB-1227 and verification regulation JJG-49. The range combines Bourdon tube sensing, clear analog indication and multiple dial sizes to cover laboratory and workshop calibration tasks as well as process measurement in industrial environments.

Accuracy Grades

• 0.4% FS
• 0.25% FS
• 0.16% FS
• 0.1% FS

Model Series & Options
The YB Series is available with 150 mm and 160 mm dial diameters and a set of configuration options for field use and panel or bench mounting.

YB-150 Series (150 mm dial)

• YB-150 – Standard model
• YB-150A – With zero adjustment
• YB-150B – With anti-glare mirror scale
• YB-150C – With zero adjustment and mirror scale

YB-160 Series (160 mm dial)

• YB-160 – Standard model
• YB-160A – With zero adjustment
• YB-160B – With anti-glare mirror scale
• YB-160C – With zero adjustment and mirror scale

Special models

• YBT-254 – Bench-mounted precision gauge, 250 mm dial
• BXY-250 – Precision sphygmomanometer, 0–40 kPa, 250 mm dial
• YB-150D – 0.16% grade, 150 mm dial

Key Features

• High accuracy across selectable grades (0.4% to 0.1% FS)
• Measurement coverage from vacuum (-0.1 MPa) up to 250 MPa
• Bourdon tube (spring-tube) mechanical sensing for stable, repeatable indication
• Choice of spring-tube materials: tin-phosphor bronze (lower ranges) and chrome-vanadium steel (higher ranges)
• Mechanical operation — no external power required
• Optional zero adjustment and anti-glare mirror scale for on-site calibration and clear reading
• Available in panel, bench and field configurations

Measurement Ranges

• Vacuum: -0.1 ~ 0 MPa
• Positive pressure (tin-phosphor bronze): 0 ~ 0.1, 0.16, 0.25, 0.4, 0.6, 1, 1.6, 2.5, 4, 6 MPa
• Positive pressure (chrome-vanadium steel): 0 ~ 6 (B type), 10, 16, 25, 40, 60 MPa
• Compound ranges: -0.1 ~ 0 ~ 250 MPa

Typical Applications

• Calibration of industrial pressure gauges in workshops and calibration laboratories
• Online high-accuracy process measurement and monitoring
• Metrological verification, transfer of pressure values and inspection
• Petroleum, chemical and petrochemical plants
• Scientific research and test laboratories
• Quality control and inspection departments

Why Choose the YB Series

• Compliant with national standards (GB-1227) and verification regulation (JJG-49)
• Wide selection of accuracy grades and dial sizes to match calibration requirements
• Proven mechanical design for low-maintenance, long-term stability
• Options for field calibration (zero adjust) and improved readability (mirror scale)

Technical specifications

• Sensing element: Bourdon tube (spring-tube)
• Accuracy grades: 0.4%, 0.25%, 0.16%, 0.1% FS
• Dial diameters: 150 mm, 160 mm (special: 250 mm for bench model)
• Measurement ranges: vacuum to 250 MPa (see ranges list)
• Spring-tube materials: tin-phosphor bronze (lower ranges), chrome-vanadium steel (higher ranges)
• Optional features: zero adjustment, anti-glare mirror scale
• Power: mechanical (no external power)
• Standards: manufactured per GB-1227 and verified under JJG-49
• Typical mounting: panel, bench and field models (YB-150, YB-160, YBT-254, BXY-250, etc.)