I. Core Specifications (Industry Standard)

Model: 12907001A

Measurement Principle: Diffused Silicon Piezoresistive

Output Signal: 4–20 mA, 2-wire (Industrial Standard)

Power Supply: DC 12–32 V (Commonly 24 V)

Accuracy: ±0.5% FS (Full Scale)

Measurement Range: 0–500 bar / 0–50 MPa (Mainstream for Construction Machinery)

Overload Capacity: 1.5–2 times the full scale

Operating Temperature: -40°C ~ +125°C

Protection Rating: IP65 / IP67 (Waterproof and Dustproof)

Process Connection: G1/4, 1/4 NPT, M12×1.5 (Common Types)

Electrical Connection: DIN 43650 Plug / Waterproof Connector

II. Compatible Equipment (Mainstream Applications)

Excavators: Cat 320D/325D/330D, Komatsu PC200/220, Kobelco SK200, Doosan DX225, etc.

Loaders / Dozers: Cat 966H, Komatsu WA380, Shantui SD16, etc.

Hydraulic Systems: Concrete Pump Trucks, Cranes, Road Rollers, Industrial Hydraulic Stations

III. Core Functions

Pressure Monitoring: Converts hydraulic/engine oil pressure into a linear 4–20 mA current signal for readout by controllers or instrumentation.

System Control: Provides feedback for main pump flow control, load-sensing functions, and pressure cut-off mechanisms.

Fault Protection: Triggers alarms, power limitation, or automatic shutdown in the event of abnormal pressure, thereby protecting the hydraulic pump and cylinders. 

Diagnostics: Integrates with the equipment's ECM (Electronic Control Module) to generate pressure-related fault codes (e.g., P0841, P0846).

IV. Common Faults and Troubleshooting

Fault Symptoms:

Pressure gauge/display reads 0 or full scale, or exhibits significant fluctuations. 

Equipment operation feels sluggish; engine stalls under load; automatic speed limitation engages.

System reports fault codes related to the pressure sensor circuit.

Simple Troubleshooting Steps:

Power Supply Check: Measure the voltage at the connector to verify that the 24 V supply is normal. Current: Measure by connecting a multimeter in series; under no-load conditions, the current is approximately 4 mA. Once pressure is applied, the current increases linearly with the pressure up to 20 mA. 

Resistance: Measure the internal resistance of the sensor; if the reading is infinite or 0 Ω, the sensor is defective.

V. Replacement and Installation Guidelines

Replacement Models: Any sensor of the same specifications (4–20 mA output), matching measurement range, and compatible interface type is suitable for use as a replacement. 

Installation:

Seal the threaded connection using PTFE tape or a copper washer; apply a tightening torque of 25–35 N·m. 

Avoid exposure to strong vibrations, high-temperature radiation, or direct impact from fluids/oils.

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