Name:Carel Electronic Controller IR33W7HR20
Brand:Carel
Model No.:IR33
Part No.:R33W7HR20
Country of origin:China
Product Type:PID Temperature Controller

Product Description

Carel Electronic Controller IR33W7HR20

Carel IR33-DN33 Universal Panel Mount PID Temperature Controller 2 Input, 2 Output Digital 230V ac On-Off

More Information
Manufacturer Carel
Product Type Refrigeration
Product Length 3 inches (7.620 cm)
Product Width 2.875 inches (7.303 cm)
Product Height 1.375 inches (3.493 cm)
Product Weight 0.25 lbs (0.113 kg)
Country of Origin China
Schedule B Number 9032.89.6085
Shipping Length 4.75 inches (12.065 cm)
Shipping Width 4.75 inches (12.065 cm)
Shipping Height 2.5 inches (6.350 cm)


Brand              Carel

Product           PID Temperature Controller

Output Type Digital

Number of Inputs 2

Number of Outputs 2

Maximum Current 8A

Maximum Operating Temperature 60°C

Minimum Operating Temperature -10°C

Terminal Type Plug-In

Control Type On-Off

Maximum Supply Voltage 230V ac

Digital Comms RS485

Display Type Single Line

Maximum Voltage 250V

Standards/Approvals UL 873, EN60730-1

Width 71mm

IP Rating IP65

Length 110mm

Mount Type Panel Mount

Series IR33-DN33 Universal

Panel Depth 94mm

CAREL Electronic Controller


The CAREL IR33 series electronic temperature controller has a supply voltage rating ranging from 115VAC to 230VAC. This controller has a width of 76.2mm and a height of 34.2mm device. It has 2 relays digital output. This single relay is perfect for controlling the minimum ON or OFF times of output to protect loads. The protection avoids control swings for more consistent and reliable functionality. The controller has a simple user interface with a clear LED screen and large control buttons.

Auto tuning

Auto tuning within the controller gives vital accuracy during configuration. The auto-tune function uses rule-based calculations typically used by experienced engineers to configure the controller either at the set-point or whilst the load is being heated from the ambient temperature.

Supplied with a default factory setting, the PID parameters allow standard control and functionality but are not optimised for the system that IR33 will control. Auto-tuning the controller is used to fine-tune the 3 control parameters involved to ensure the controller is optimised for any application.

Real-time clock

The addition of a real-time clock (RTC) to the IR33 series aids in the management of working cycles within the controller as well as to support logging alarms. The RTC in the controller is a low power resource for accurate timekeeping and freeing up system power for accurate monitoring and control.

Working cycles controlled by the IR33 can rely on the internal clock for accuracy with the ability to remain timekeeping even when the main system power source is off or unavailable.

Real-time clocks are key to an accuracy within time-based controllers and should not be confused with hardware clocks governing digital information. Real-time clocks, unlike hardware clocks, count in human time units for relative control.

Optional expansion

Suitable for use with remote controls, the IR33 series can use an infrared remote control allowing access to all main functions as well for configuring system parameters. This allows easy setup and use of all IR33 controllers from a distance.

Find the IRTRUES000 IR33 remote control here: 745-7999

Programming keys are a simple and effective way to quickly program controllers both when on and also when not connected to a power supply. This disconnected programming function can reduce the risk of errors in the controller. A programming key allows for fast and effective technical service and can be used in just a few seconds for ease.

Find the IROPZKEY00 programming key here: 745-8002


Features and Benefits

2 independent control loops
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