This sensor has a USB and aquabus to transmit the sensor data.
The RPM signal is only for error indication.
The high flow USB has NO flow impulse output. The aquabus can only be used with a aquaero.
The alarm output from mps deliver no flow signal.
Alright good info thanks and understood.
Though I guess it is a little bit confusing even after reading both the manual for the XT pump and the flow sensors. The reason it's confusing is A) the pump has a pinout labeled "aquabus/flow" and you'd think since the sensor has that too, it can somehow work. (but pin numbers don't match) and
B) RPM and Alarm are normally the same 3 pin outputs, and both the pump and sensors have this input/output with identical connector. Plus the Sensor has a "configurable" alarm output mentioning RPM as per the MPS manual:
8.3. Connector „alarm“
Depending on configuration, this header can either be used as a generic speed
signal or as a “open collector” switching signal.
The speed signal or the switching signal can be configured
to be deactivated or activated in case of an
alarm condition for monitoring purposes. For example,
a speed signal cable (art. 93111) can be used to connect
this header to the CPU fan header of your motherboard.
Depending on on the type of motherboard and
BIOS settings, emergency shutdown of the PC upon
alarm condition or an acoustic alarm may be initiated.
Please refer to the motherboard manual for details on
functionality and BIOS settings.
Pin assignment: Pin 1: GND
Pin 2: not connected
Pin 3: RPM/open collector max. 30 V / 100 mA
I think it would be prudent to mention in the manuals that the ALARM pinput can not be used to send actual flow data like the non-usb version except to indicate an alarm condition (flow/no flow). It's really NOT "generic speed signal" then.
I believe the "High Flow" and "High Flow USB" are both mechanical impeller based, with the interface module being the only difference.
Ahh yes, I see this now in their MPS manual section 5.
5.1. Technology and specific characteristics
The flow sensor „high flow USB“ features an integrated impeller which is driven by
coolant flow through the sensor. Movement of the impeller is electronically detected
and converted into a flow value.