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Appendix D. CNF4 Heater/Ventilator

D.4 CR3000 Datalogger Program with

Heater/Ventilator Control

This example measures the four radiation outputs, thermistor temperature, and

controls the ventilator and heater using SW12V-1 and SW12V-2 channels on

the CR3000, respectively. In this example program, the ventilator and heater

can be turned on or off by manually setting the flag(1) and flag(2) high or low,

respectively. The program can be modified to include the conditional

statements to control the heater and ventilator based upon the environmental

parameters, such as light level and dew point temperature.

'CR3000 Series Datalogger

'CNR4 program

'This program measures CNR4 four-component net radiometer

'This program also measures the thermistor inside the CNR4

'In addition this program controls heater and ventilator

' using separate SW12V-1 and SW12V-2 channels

'The heater and ventilator are turned on/off by setting flag(1), and flag(2) high and low, respectively.

'User must enter the sensitivity values for all four probes in the program and save/compile

'prior to downloading it to the datalogger.

'Search for the text string "unique" to find places to enter the sensitivity values.

'Wiring Instructions

'ANALOG CHANNELS

'1H CNR4 Pyranometer Upper signal (red)

'1L CNR4 Pyranometer Upper signal reference (blue)

'gnd jumper to 1L

'2H CNR4 Pyranometer Lower signal (white)

'2L CNR4 Pyranometer Lower signal reference (thin black)

'gnd jumper to 2L

'3H CNR4 Pyrgeometer Upper signal (grey)

'3L CNR4 Pyrgeometer Upper signal reference (yellow)

'gnd jumper to 3L

'4H CNR4 Pyrgeometer Lower signal (brown)

'4L CNR4 Pyrgeometer Lower signal reference (green)

'gnd jumper to 4L

' CNR4 shield (clear)

'8H

'8L CNR4 thermistor signal (white)

'gnd CNR4 thermistor signal reference (black)

' CNR4 thermistor shield (clear)

'VOLTAGE EXCITATION

'VX1 CNR4 thermistor voltage excitation (red)

'POWER OUT

'SW12V-1 CNF4 ventilator + (red)

'SW12V-2 CNF4 heater + (green)

'G CNF4 ventilator - (blue)

D-8

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