RPM-ALX400 Reservoir and Pump Module for ALX Series (Rev.2.4)

Part No. RPM-ALX400 In-Stock Icon In Stock FedEx orders placed in the next 7 hrs, 5 mins ship today.
Volume Pricing
Qty 1 : $689.49/ea
2 : $667.46
5 : $645.44
10 : $634.42
20+ : $623.41
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RPM-ALX400 is a front reservoir, pump, and control unit for Koolance's ALX modular cooling systems. Included hardware allows it to be physically combined with an HXM heat exchanger module (sold separately).

This unit has a USB port for viewing and logging of temperature and sensor data via the Koolance System Monitor application. Rev.2.0 ALX systems add software control options for temperature set point, alarm, trigger relay, pump speed, and fan speed. Rev.2.1 adds a pump disable option and 0-5V output signal.

  • Temperature in °C/°F with set-point based on: liquid, or one of two optional K-type thermocouples
  • Pump: 10 manual levels, up to 8.2LPM (2.2GPM)
  • Select only values you want displayed on the front 2-line OLED display (fixed or rotating)
  • **Show coolant flow rate in LPM/GPM
  • Show pump impeller speed in RPM
  • **Show radiator fan speed in RPM
  • Enable audio alarm based on: temperature, **flow rate, and/or reservoir coolant level
  • Enable relay trigger (NO or NC) based on: temperature, **flow rate, and/or reservoir coolant level
  • Power input: 12VDC, 25W (plus any connected HXM modules)
  • Reservoir capacity: 600ml (20.3 fl oz)
  • G 1/4 BSPP threads on back for fittings

**When attached to an HXM heat exchanger module

NOTE: Requires 12VDC input power. Koolance offers a separate power supply for AC wall outlet sources.


Weight 4.60 lb (2.09 kg)
Fitting Thread G 1/4 BSPP
Max Pressure Tolerance @ 25°C 2kgf/cm2 (28.5psi)
Max Temperature Tolerance 60°C (140°F)
Capacity 400ml
Display Type OLED
Pump PMP-400 @ 12V
Temperature Sensors Liquid & Two K-Type Thermocouples (optional)
Max Flow Rate 8.2LPM (2.2GPM)
Voltage 12 VDC
Diagrams / Models (See Files Tab for Diagrams and 3D Models)

Liquid Coolants

Koolance's product warranty does not cover the use of 3rd-party coolants, coolant additives, or corrosion. Koolance LIQ-702 or LIQ-705 coolants are strongly recommended to help avoid issues with mixed metals or biological growth. Additionally, do not use aluminum with bare (unplated) copper or bare (unplated) brass in the same system. Do not use silver with nickel in the same system.