Differential controllers are used to
sense a difference in temperature with temperature sensors. This difference in
temperature is then used to regulate the on and off cycles of a pump. The NTC
10K thermistor is commonly used for solar heating applications because it
responds well from 0*F to 250* F. It's also rugged, easy to use and
inexpensive and it may be used to regulate either an AC or DC pump. The LM34
sensor is used to display actual temperatures, but this is not a necessary
function of a controller. To automate a net heat gain from sunlight a controller
need only sense and respond to heat availability. My first differential
controllers did this, but my customers wanted more. They wanted a visual
indication of solar heat so my latest BDC ( Basic Differential Controller ) has
this as a standard feature. The BDC features include:
An integrated differential on
and differential off pump adjustment
A pump
on indicator lamp
A heat
available indicator lamp
A relay that can handle AC or DC
pumps requiring less than 300 watts of power
A voltage regulator that limits
current in the probes
A mounting block
Two NTC 10K thermistor probes
Polarity protection incase the
DC supply is reversed
Differential controllers are used to
sense a difference in temperature with temperature sensors. This difference in
temperature is then used to regulate the on and off cycles of a pump. The NTC
10K thermistor is commonly used for solar heating applications because it
responds well from 0*F to 250* F. It's also rugged, easy to use and
inexpensive and it may be used to regulate either an AC or DC pump. The LM34
sensor is used to display actual temperatures, but this is not a necessary
function of a controller. To automate a net heat gain from sunlight a controller
need only sense and respond to heat availability. My first differential
controllers did this, but my customers wanted more. They wanted a visual
indication of solar heat so my latest BDC ( Basic Differential Controller ) has
this as a standard feature. The BDC features include: