- EN
| Parameter | Specification |
|---|---|
| COGENG Part Number | 2842728 (284-2728) |
| OEM Equivalent | Caterpillar 2842728, 284-2728 |
| Product Type | Hydraulic Pressure Sensor |
| Sensor Type | Piezoresistive pressure transducer |
| Output Type | Current loop (4-20 mA) or analog voltage |
| Application | Hydraulic system pressure monitoring (main pump, pilot, implement) |
| Compatible Model | Caterpillar 324E Excavator |
| Brand | Part Number |
|---|---|
| COGENG | 2842728, 284-2728 |
| Caterpillar | 2842728, 284-2728 |
| Interchange | 2842729, 2842730, 2842731, 2842732, 288-4810, 2884810 |
| Parameter | Specification |
|---|---|
| Supply Voltage | 8-36V DC (typically 24V system) |
| Output Signal | 4-20 mA (current loop) or 0.5-4.5V analog |
| Current Draw | ≤ 25 mA |
| Response Time | < 5 ms |
| Insulation Resistance | ≥100MΩ @ 500V DC |
| Reverse Polarity Protection | Yes |
| Overvoltage Protection | Yes |
| Parameter | Specification |
|---|---|
| Pressure Range | 0 - 350 bar (0 - 5,075 psi) |
| Measurement Type | Gauge pressure (relative to atmosphere) |
| Accuracy | ±1.0% of full scale |
| Overpressure Limit | 525 bar (7,600 psi) |
| Burst Pressure | 875 bar (12,700 psi) |
| Compensated Temperature | -40°C to +105°C |
| Parameter | Specification |
|---|---|
| Connector Type | 3-pin Deutsch DT / AMP |
| Mounting Thread | 7/16-20 UNF or 1/4"-18 NPT (OEM spec) |
| Hex Size | 22 mm (7/8") |
| Housing Material | Stainless steel / Zinc-nickel plated steel |
| Diaphragm Material | 17-4PH stainless steel |
| Seal Material | NBR / FKM (Viton) |
| Weight | 0.15 kg (0.33 lbs) |
| Overall Length | 65 mm |
| Pin | Function | Signal Type | Wire Color (Typical) |
|---|---|---|---|
| Pin 1 | Sensor Supply (+) | 24V DC | Red |
| Pin 2 | Sensor Signal | 4-20 mA or 0.5-4.5V | Yellow/White |
| Pin 3 | Sensor Ground (-) | 0V | Black |
| Pressure (bar) | Pressure (psi) | Output (mA) | Condition |
|---|---|---|---|
| 0 | 0 | 4.0 ±0.1 | No pressure |
| 87.5 | 1,269 | 8.0 ±0.1 | Low pressure |
| 175 | 2,538 | 12.0 ±0.1 | Medium pressure |
| 262.5 | 3,806 | 16.0 ±0.1 | High pressure |
| 350 | 5,075 | 20.0 ±0.1 | Maximum pressure |
| Pressure (bar) | Pressure (psi) | Output (V) | Condition |
|---|---|---|---|
| 0 | 0 | 0.5 ±0.1 | No pressure |
| 87.5 | 1,269 | 1.5 ±0.1 | Low pressure |
| 175 | 2,538 | 2.5 ±0.1 | Medium pressure |
| 262.5 | 3,806 | 3.5 ±0.1 | High pressure |
| 350 | 5,075 | 4.5 ±0.1 | Maximum pressure |
| Parameter | Rating |
|---|---|
| Operating Temperature | -40°C to +105°C (-40°F to +221°F) |
| Storage Temperature | -40°C to +125°C (-40°F to +257°F) |
| Ingress Protection | IP67 / IP69K (connector mated) |
| Vibration Resistance | 20G @ 50-2000Hz |
| Shock Resistance | 100G |
| Media Compatibility | Hydraulic oil, diesel, water-glycol |
| Corrosion Protection | 500+ hours salt spray |
| Parameter | Specification |
|---|---|
| Model | Caterpillar 324E Excavator |
| Type | 24-ton Crawler Excavator |
| Engine | Cat C7.1 ACERT |
| Engine Power | 119-130 kW (160-174 HP) |
| Operating Weight | 24,000 - 26,000 kg |
| Hydraulic Pressure | 350 bar (5,075 psi) |
| Series | E-Series |
| Sensor Location | Pressure Range | Function |
|---|---|---|
| Main Pump Pressure | 0-350 bar | Monitors main hydraulic pressure |
| Pilot Pressure | 0-50 bar | Monitors pilot control pressure |
| Implement Pressure | 0-350 bar | Monitors boom/arm/bucket circuits |
| Return Filter | 0-10 bar | Monitors filter restriction |
| Case Drain | 0-5 bar | Monitors pump/motor case pressure |
| Swing Circuit | 0-350 bar | Monitors swing brake/pressure |
| Travel Circuit | 0-350 bar | Monitors travel motor pressure |
| Component | Function |
|---|---|
| Sensing Element | Piezoresistive silicon strain gauge (pressure changes resistance) |
| Signal Conditioning | Internal ASIC converts resistance to 4-20 mA or 0.5-4.5V |
| EMI Protection | Integrated filtering for electrical noise rejection |
| Temperature Compensation | Internal circuit compensates for temperature variation |
| ECM Interface | ECU reads signal for hydraulic control and diagnostics |
| Function | Description |
|---|---|
| Load Sensing | Provides feedback for variable displacement pump control |
| Pressure Cut-off | Signals pump destroke at maximum pressure |
| Pilot Enable | Confirms pilot pressure for safety interlocks |
| Filter Monitoring | Alerts operator when filters need replacement |
| Implement Control | Enables proportional control of hydraulic valves |
| Diagnostics | Detects pressure faults and stores DTCs |
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