New Temperature Sensor Plan
Current state
We have 3 temperature channels running right now. These are hosted by c1susaux and the db files are present at:
/cvs/cds/caltech/target/c1pem1/tempsensor/C1PEMaux.db
Plan
We'll buy 3 BASE-UNIT which are Modbus gateways and have temperature sensors in-built. 1 BASE-UNIT will be at the vertex and the other two will be at end stations. Each of these units will be able to run two extended ENV-TEMP temperature probes over ethernet cables. 20m ethernet cables from end stations will extend temperature sensors in the middle of the arms.
Old environment temperature sensors
We have several different kinds of thermometers in the lab:
- There are the Mercury / Alcohol standard glass-bulb types that Steve has fastened all over the place.
- The thermostats which control the room temperature have unreliable thermometers.
- There are temperature sensors in the dust monitors which are recorded as EPICS channels.
- The PSL Refcav has thermistors on the refcav can (RCTEMP) and a thermistor on the table (RMTEMP).
- There is a thermometer on the PSL chiller.
- The PSL MOPA's head temperature is recorded as is the NPRO crystal and pump diode temperature.
Precision Temperature Sensor for the Chambers
We want to precisely measure the temperature of the chambers so that when we track drumhead modes we can remove the effect of the ambient temperature.
At the sites, Phil Willems has installed LM34 based sensors.
Here is the National Semiconductor doc on temperature sensors: temphb.pdf
Maxim page on temperature sensors: http://www.maxim-ic.com/appnotes.cfm/an_pk/689