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 while we will have separate cables, the python code below does not differentiate by cable when it combines sensor IDs into a list.

Software Actions

Required Adjustable Settings

Device Setup Parameters

The current device settings can be listed through a telnet connection (see instructions below for changing IP address).

The current list of settings is included in the file here. Note our device was used previously by another project, so while these are the current settings they may not be the default settings.

Note the listing is provided here for reference only; we do not need to query or set these parameters in software.

Required Telemetry

Sensor Name Look-up Tables

Each sensor has a unique ID that is used by the LinkHub-E base. The IDs are not easily remembered so we’ll want a look-up table to tie the sensor IDs to a KPF sensor location.

Required Alarms

Relevant Datasheets & Manuals

Relevant Software

Installation Instructions