Medium Precision Temperature Sensors

Table of Contents:

Introduction

A device that allows a large number of temperature sensors to be daisy-chained along a main branch cable. We are using these sensors throughout the system for temperature measurements that do not require the precision/accuracy/expense of a Lakeshore controller.

Relevant Devices

Photos of Device

The sensors are semiconductor devices with three pins:

The sensor cables connect to the base via a custom cable, with an RJ-45 (ethernet) connector on one end and the sensors on the other. The base unit allows four sensor cables to be attached to it (with multiple sensors on each cable, like the one shown here).

For the cable shown here a Winchester connector was used to allow the sensor section to be easily separated from the ethernet cable section. We will likely employ the same scheme for KPF.

Note how the sensors can branch off the ‘main line', and also branch off the ‘branches’.

Relevant Functional Block Diagram

Note that we have separate cables, however the software interface does not differentiate by cable when it combines sensor IDs into a list.

Sensor Name Look-up Tables

Thermal Sensor Locations (Spectrometer and Hallway) contains the list of sensor locations.

Relevant Datasheets & Manuals

Installation Instructions