Land Instruments Zero Calibration Motor and Micro Switch 26672N 702.778

See Pictures-New-No box or paperwork, Make sure this is the one you have, there are no pictures of these units that I can find.

  • Part Number 26672N: The specific identifier for the complete assembly, which includes the DC motor and the micro switch mechanism.
  • Part Number 702.778: This number identifies the associated Printed Circuit Board (PCB) that the motor assembly connects to or is mounted on, which controls the motor's operation and processes the micro switch's signal. 
Function
This assembly is a critical component used in older, non-contact industrial thermometers from the Land Instruments System 4 range, such as the Landmark Basic processor units.
Its function is essential for maintaining the accuracy of the instrument:
  1. Automated Zero Calibration: The motor physically moves a mechanism (often an optical shutter or a flag) into the optical path of the infrared sensor.
  2. Establishing a Baseline ("Zero"): When the mechanism is in place, the system measures a known reference point (the "zero" or baseline reading) to compensate for any minor electronic drift (zero drift) that might occur over time.
  3. Micro Switch Feedback: The micro switch provides feedback to the main processor unit (like the 702.046a PCB you asked about earlier) to confirm the physical position of the motor mechanism (e.g., "shutter open" or "shutter closed for zero check"), ensuring the calibration routine runs correctly. 
This part facilitates automatic, routine maintenance of the thermometer's calibration to ensure continuous accuracy in demanding industrial environments
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