Choosing The Correct Temperature Controller
What Digital Temperature Controller Do I Need?
There are several important considerations when choosing a temperature controller. We explain the important differences to help you find the right device for your application.
PID Or On/Off Control
PID control generally achieves higher accuracy than a standard digital thermostat also known as an on/off controller. This is due to the internal logic of the device which controls the setpoint to a finer tolerance. PID control is typically used in conjunction with a fast switching relay with no moving parts. This allows the maximum benefit of small incremental control adjustments. A solid state relay can be burst fired around the setpoint to maintain the process temperature at a steady value.
An on/off controller is still suitable for many applications where the process temperature has a wider tolerance and the devices under control are not suited to fast switching.
If you require accuracy +/- 1 degree Celsius or below consider PID.
For applications with a tolerance of +/- 3 degrees Celsius or more On/Off control can be a simpler option.
Input Sensing
It is worthwhile thinking about the sensing device you intend to use. The temperature controller may permit a broad range of different inputs in which case there is greater flexibility in terms of the sensor. PT100, Type J and K thermocouples are all widely available sensor types supported by Novus controllers.
Power Supplies
Any controller you purchase will require connection to external power. Novus provide the simple option of a wide ranging AC\DC model which is typically used for single phase voltages 100-240V. Or a 24V AC\DC model which would connect to a power supply or transformer.
Physical Dimensions
If you are looking to replace an existing controller then please give some thought to the panel cut out and any physical limitations. DIN standard cutouts are supported by Novus and we have a range of adaptor plates to simplify in-service replacements or upgrades.
The 1/16 DIN standard cutout is 46 x 46mm. This is now the most widely used.
Where To Start
For most basic PID applications where one setpoint is sufficient we recommend the Novus N1030 as this offers incredible value for money in a small footprint. This tried and tested design contains enough features to get the application up and running quickly without overwhelming the user.
If you need the ability for more precise control of the setpoint such as ramp and soak profiles whereby a non-linear temperature profile is created then it is worth considering the Novus N1050. This is a feature rich controller which allows setup by USB using the latest QuickTune software.
Download The Selection Guide
You can download an easy to use selection guide here:
Need More Help?
We are always happy to talk through your needs and offer any suggestions for a successful purchase. Please contact us if you require any technical or sales support