====== Temperature Control Box for Pressure Transducers ======

===== Writing Diagram =====

{{:atmos:citation:instruments:gust_probe_assembly.pdf|}}





Temperature controller manual for CAL 3300 can be found at the following link:

  * [[http://www.farnell.com/datasheets/58850.pdf]]

===== Design Suggestions =====

Size of the box - 14 inch width, 12 inch depth, 6 inch height.  1 inch insulation inside of box.

We should use [[http://www.rkcinst.co.jp/english/control_01.htm|proportional or integral Action Control]] and not simple on off control.  This eliminates a temperature cycle which on get from on/off control.   

You can buy heating elements from [[http://www.wattco.com/Articles.html]]

Looks like you can buy small heater and controller from [[http://www.directindustry.com/prod/leister-process-technologies/electric-hot-air-generator-for-hot-air-staking-applications-9088-221246.html|Direct Industry]]

===== Query Temperature through Laptop =====

Need a serial cable with a null modem attached

Use RS232 HexCom Tool program to communicate with the temperature controller
  -When program is open, click on serial cable button
  -In the new window, make sure the settings are:
    *Port: Com 2
    *Baud: 9600
    *Parity: None
    *Bits: 8
    *    : 1
    *Flow Control: None
  -Click "Open" at the bottom of the window (Opens the Port)
  -Put in the hex query string (0103001c000145cc), hit enter
  -String will be returned in the lower window
  -The 4th and 5th segments of returned string is the temp in hex (ex: 00 c9)
  -Convert the 5th segment from hex to numerical number by multiplying the first digit by 16 and adding on the second digit (ex: c=12, 12*16=192, 192+9=201)
  -Divide the numerical number by ten to get the temperature in Celsius (ex: 201/10=20.1)