New Temperature Sensor Plan

We'll buy 3 [BASE-UNIT](https://infrasensing.com/sensors/baseunit.asp) which are Modbus gateways and have temperature sensors in-built. 1 [BASE-UNIT](https://infrasensing.com/sensors/baseunit.asp) 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](https://serverscheck.com/sensors/sensor_temperature.asp) temperature probes over ethernet cables. 20m ethernet cables from end stations will extend temperature sensors in the middle of the arms.

[PRICE QUOTE](TemperatureSensorQuote.pdf) [FINAL QUOTE (to request)]()

Old environment temperature sensors

We have several different kinds of thermometers in the lab:

1. There are the Mercury / Alcohol standard glass-bulb types that Steve has fastened all over the place.
2. The thermostats which control the room temperature have unreliable thermometers.
3. There are temperature sensors in the dust monitors which are recorded as EPICS channels.
4. The PSL Refcav has thermistors on the refcav can (RCTEMP) and a thermistor on the table (RMTEMP).
5. There is a thermometer on the PSL chiller.
6. 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