DAIICHI KEIKI Pressure Gauge Model BU3/8×100×3MPa

Full Specifications of DAIICHI KEIKI BU3/8×100×3MPa Pressure Gauge

1. Model Code Breakdown (BU3/8×100×3MPa)

• BU: Mounting form – Type B case with rear flange, bottom radial connection (rear fixed flange for flush mounting on panels or control cabinets)

• 3/8: Connection thread – G3/8B parallel British pipe thread, bottom radial outlet

• 100: Dial diameter – Φ100 mm, ensuring clear readings for long-distance observation

• 3MPa: Measuring range – 0～3 MPa (0~30 bar)

2. Basic Brand Information

Brand: DAIICHI KEIKI Mfg. Co., Ltd.Standard: Complies with JIS B7505 standard for Bourdon tube pressure gaugesType: Conventional industrial Bourdon tube pressure gauge

3. Core Technical Specifications

1. Accuracy ClassStandard industrial version: ±1.6%FS; High-precision version (SUS316 Bourdon tube) with Class 0.6 is available as an option.

2. Construction & Materials

• Case: Cold-rolled steel with baked paint, dust-proof sealed structure

• Bourdon tube / Connection socket: Brass (standard version); SUS316 stainless steel optional for corrosive media

• Window: Safety protective glass, equipped with explosion relief back cover

3. Operating Conditions

• Applicable media: Non-corrosive fluids to copper alloys, such as air, water and hydraulic oil

• Ambient temperature: -20～+60℃

• Allowable transient overload: 1.25 times full scale (3.75 MPa for short-term operation)

4. Mounting DimensionsThread: External G3/8 threadΦ100 dial, fixed via rear flange cutout for flush cabinet mounting

4. Product Features

• Dust-proof sealed case, durable in dusty and humid workshop environments

• Stable pointer damping; the pointer resists shaking under mild pressure pulsation

• Original Japanese dial marking with standard linear MPa scale and clear graduations

• Type B flange mounting fits panels of machine tools, hydraulic power units, air compressors and injection molding machines

5. Application Scenarios

Measuring range: 0～3 MPa (30 bar), G3/8 thread, Φ100 flush panel mounting. Suitable for medium & low-pressure hydraulic, pneumatic and water supply equipment, categorized as follows:

(1) Hydraulic Equipment

• Small vertical injection molding machines: Monitor low-pressure mold clamping, ejector oil pressure and low-pressure injection circuits; the 3 MPa range perfectly matches low-pressure preloading oil lines.

• Hydraulic power units for machine tools: Clamping pressure of grinders, milling machines, punch presses and hydraulic fixtures (tool clamping pressure generally ranges from 1～2.5 MPa).

• Hydraulic lifting platforms and small hydraulic jacking equipment: Low-pressure oil pressure indication and overload early warning for lifting loads.

• Rubber vulcanizers and small hydraulic hot presses: Low-pressure mold closing pressure monitoring.

(2) Pneumatic & Air Compressor Systems

• Small screw and piston air compressors: Low-pressure supply pressure after secondary pressure regulation (standard factory supply pressure: 0.5～0.8 MPa with sufficient range margin).

• Air receivers and pneumatic control cabinet panels: Main pipeline pressure monitoring for centralized workshop air supply; the flush flange mounting is ideal for control cabinet cutouts.

• Automated pneumatic production lines and cylinder booster circuits: Low-pressure output pressure indication of booster valves.

(3) Water Treatment, Water Supply & Cleaning Equipment

• Water purifiers and RO reverse osmosis systems: Pressure monitoring for low-pressure pretreatment pipelines (raw water and pre-filter pressure normally 1～2.5 MPa).

• Low-pressure inlet side of small high-pressure cleaners and pipeline booster pumps: Inlet pressure stabilization monitoring.

• Building secondary water supply and small water supply booster units: Pressure monitoring for domestic water pipelines.

(4) Rubber, Plastic & Packaging Machinery

• Cooling water circuits of film blowers and extruders: Water pressure monitoring for cooling circulation pipelines.

• Automatic packaging machines, labeling machines and pneumatic sealing machines: Panel display of equipment air source pressure.

• Low-pressure air supply circuits of foaming equipment.

(5) General Industrial Applications

• Cooling water circuits of boiler auxiliary equipment and small heat exchange stations: Low-pressure circulating water pressure monitoring.

• Cooling circuits and mold water lines of die-casting machines.

• Laboratory test benches and small hydraulic test tooling: Accurate observation for low-pressure testing (0～3 MPa).

• Auxiliary low-pressure oil circuits of construction machinery attachments, small agricultural machinery and compact construction equipment.

6. Matching Advantages of This Model

• Large Φ100 dial delivers legible readings from a distance, a standard configuration for workshop equipment panels.

• BU rear flange flush mounting allows direct installation on control cabinets and equipment panels for neat appearance.

• G3/8 thread is widely adopted in hydraulic and pneumatic systems, offering high compatibility with pipeline fittings.

• The 0～3 MPa range covers most medium/low-pressure water, gas and oil applications; an excessively wide measuring range would sacrifice reading accuracy.

• DAIICHI KEIKI (DK) pressure gauges suppress slight pressure pulsation, preventing frequent pointer vibration under vibration from oil pumps and air compressors.

Product Name: DAIICHI KEIKI Pressure Gauge BU3/8×100×3MPa