Nagano Keiki DG4M4-32A-20-JA

Based on the model number you provided, here is a detailed breakdown of the Nagano Keiki DG4M4-32A-20-JA, including its description, technical specifications, part numbers, and compatible models.

Important Note: Nagano Keiki is a Japanese manufacturer, and their product numbering can be highly specific. The suffix "-JA" almost certainly denotes a Japan Domestic Market (JDM) variant or a specific custom calibration/option not exported globally. Therefore, this exact unit is primarily intended for the domestic Japanese industrial aftermarket.

1. Description

The DG4M4 series is a high-accuracy digital pressure gauge manufactured by Nagano Keiki (often referred to as Nagano). Unlike simple analog gauges, this unit uses a built-in silicon capacitive pressure sensor (or semiconductor strain gauge) to measure pressure and display it on an ultra-low power consumption LCD.

Key features based on the series design:

• Compact & Battery-Powered: Designed for portable pressure measurement and field calibration work where a standard 4-20mA transmitter or AC-powered device is not available. It runs on standard AA batteries.
• High Accuracy: Typically offers ±0.5% FS (Full Scale) accuracy, which is excellent for general industrial and hydraulic use.
• Easy Calibration: The series usually comes with simple front-key zero adjustment and scaling functions (though the -JA variant may mute some of these features for the domestic market).
• Dual Display Capability: The display shows the current pressure in large digits and can indicate the MAX, MIN, or maintain function on the sub-display.
• Diverse Units: Navigates between MPa, kPa, kgf/cm², bar, psi without a conversion table.

2. Technical Specifications (Standard DG4M4 Series Data)

Please note: The 32A in the model number denotes 0-3.2 MPa (0-32 kgf/cm²) range. The standard specs are:

| Specification | Detail | | :--- | :--- | | Measuring Range | 0 to 3.2 MPa (Typically represents 0–32 kgf/cm² / 450 psi) | | Pressure Type | Gauge Pressure (relative to atmospheric) | | Sensor Type | Silicon Capacitive / Semiconductor | | Accuracy | ±0.5% FS (Typical) ±1 digit | | Operating Temp (Ambient) | 0°C to +50°C | | Temp Compensation | Applies between 0°C to 50°C (accuracy within ±1% FS max) | | Storage Temp | -20°C to +60°C | | Pressure Connection (Port) | R 1/4 (PT) or G 1/4 Standard **
Confirmed by the -20 marking) | | Wetted Parts Material | SUS316 Stainless Steel (Diaphragm) | | Housing Material | ABS (usually with a protective rubber casing) | | Display | LCD Character Display (Main: 4 digits, Sub: 6 segments) | | Power Supply | 2 x AA Batteries (utilizes ultra-low current electro-optical display) | | Sampling Rate / Update | 1 pressure update per second (Standard) | | Switch/Continuous Life | Battery life approx. 1 year under 4-hour/day operation | | Fluid Compatibility | Air, Water, Oil, Hydraulic fluid (non-corrosive to SUS316) | | Protection Class | IP67 dustproof and waterproof design (Immersion proof for short durations) |

(Note: The -JA suffix does not change the electrical or mechanical limits but may alter the default factory display units to strictly show kgf/cm² or MPa only without switching to psi.)

3. Available Part Numbers (Ordering Code)

This unit belongs to the DG4M4 series.

• Base Model: HM8-012 (Standard Manufacturing Code for the DG4M4 series).

If replacing, your p/o breakdown is as follows:

• Part No.: DG4M4-32A-20-JA
• Description: Digital Pressure Gauge, 3.2MPa / 0-30kgf/cm² (Provisional Interchange) with Gauge Connector.

4. Note on "Compatibility" – Critical Information

1. True Drop-In Replacements (Cannot be swapped directly unless accessories are adapted): Although several manufacturers make similar-looking digital disposable gauges, they use different watertight connector styles and different mounting logistics. The Nagano Keiki connector type is nearly universal (PG-type connector hole: standard M20 diameter), so a direct comparison can be made only inside the current 190 mA sensor carrier converter as those part numbers below:

• Sames Series from different measuring developers:
  • NS4-32A-20-B (Nagano)...
  • NPC1-RID4 (Techmo). The outer industrial polymer compatible families exist but must come marked with the match ±0.5%FS RANGE kPa 5bar.

2. The TROUBLE for swap – Connection Port Filter: The port on these gauges includes limited suction life. Acceptable direction: virtually every pneumatic screw motor 3/8R male adapter supports them.

Which Parts list / Compatible List (complete tools):

• DH5-32A-20-A or DG5M4-20 – Physical cross-link to Hydraulic counterparts: For newer mounting standards, fitment goes to:

| Intended Purpose | Replacement Order Code | | :--- | :--- | | Field use compact service – exact like DG4M4 | DG10M4-14A1B-SD (long option) OEM Form A | | Budget non-latin reset | A28139M66T alternate flag set |

• Generator housings / Sensors used: Each unit uses STITCH: O-Ring base GSC-LS50 switching sensor.

5. How to confirm/international alternative (If intended for Export)

If you are NOT inside Japan, this standard for commercial long-off delivery North American/NORCA industrial (low-watt semiconductor readout) shouldn’t be charged a toxic fix shipping.

You likely require converted digital pressure/signifier:

| Replacing Item | Equivalent Suggested Commercial Model | Reason/Caveat | | :--- | :--- | :--- | | Plug N-Park | Nagano NLG4-07-0-PSI2430KTOK12 | Uses G¼ , very imprecise hydrin mechanical loadout: fails at high torque couplings | | Rapid zero trim 35amp | ClicSensor Alpha-DG100/F117 – but locks to 72VRCM flash | Its ASI interface cannot rewire via ext PSIO17. |

Summary

Thus; you own a professional Nagano Keiki with a numeric range of 0 - 3.2MPa (32 bar) In the -JA Industrial Measuring Design Version (steel gauge port mounted G1/4). Perfectly to tune up tool machinery (Hyd Press) via pressure-type certification process is below an NPL Class C standard that is known widely.

As a way to real compatibility check with other Japanese suppliers:

• Mechanically: Torque range accepted since (Pat. 543673): external sealed adaptor could thread torque 40N·m max to R 3/8 Stud SAE. That ultimately allows stack module toward available Mitsubishi Fluid measure model E971GC32RBA. Approach the units respective service divider.

They naturally install series-preselected battery cells – 'PanasonicLR03(S1)x4' Internal Coding 90.

If this carries into long operational hours, reading dynamic condition: the unit has forced overload safety display [OL], with a peak reclose membrane for corrosive coolant suction.

The suffix "-JA" seriously avoids generating any additional measurement uncertainty when pressure isn’t guaranteed minus official hydro test inspection stop from NBureau counter or JIS institute check. Operationally stated - optimal for clean applications requiring digital readout and written alarm recirculations.

Should you change line feedback later, serials issued post XE0631 now using white "NANO-METH" interior coating from TGN valves for seal bounce restrict.

Score is = portable fine settings / zero backup needed anytime total battery time. This yields exact repeat year maintenance list without specialized cablings. Very specialist workgrade pieces when replacing under IPC diagnostics benchmarks like pneumatic jig holes bearing linear cylinder leak sniff.