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Komatsu AIH-123QS-PP-UC
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Emerson KL2101X1-BA1
Emerson KL2101X1-BA1
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Yokogawa KS1-10-B
Yokogawa KS1-10-B

Komatsu AIH-123QS-PP-UC

Product Brief:​
This is an OEM Komatsu heavy-equipment electronic component typically used as a hydraulic pressure sensor or pressure-activated PPC (Pressure Proportional Control) switch in excavator loader-backhoe hydraulic systems (e.g., PC200/PC300 series). It detects joystick or main pump pressure to signal the hydraulic pump controller for auto-decel cancellation or flow demand modulation.
Category:
Description
Key Characteristics:
  • Application:​ Komatsu hydraulic excavators — monitors pilot pressure from joystick (PPC pressure) or main pump pressure
  • Signal Type:​ Normally a 3-wire 5 V / 12 V / 24 V DC analog (0.5–4.5 V proportional) or ON/OFF switch depending on variant
  • Pressure Range (typical PPC sensor):​ 0–40 bar (0–580 psi) for pilot pressure sensing
  • Supply Voltage:​ 5 VDC (sensor excited from machine ECM) or 12/24 VDC (switching type)
  • Connector:​ Komatsu sealed 2-pin or 3-pin round waterproof connector (IP67 rated)
  • Port Thread:​ Typically M10 × 1.0 or 1/8″ BSP (hydraulic threaded fitting)
  • Housing Material:​ Brass or zinc-plated steel with epoxy-sealed electronics
  • Operating Temp:​ -40 °C to +125 °C
Function & Principle:
  • Detects hydraulic pilot pressure when operator moves joystick/lever → sends signal to Pump Controller (ECM)
  • Can cancel “Auto-Decel” mode or command increased pump displacement
  • In failure mode may cause loss of auto-decel or trigger diagnostic code (e.g., D-series or CA-series fault codes on monitor)
Installation & Notes:
  • Use thread sealant appropriate for hydraulic systems; do NOT over-torque
  • Verify correct pinout before connecting to machine harness
  • Protect from impact and excessive vibration; check for hydraulic oil contamination periodically
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