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1/4 DIN Temperature Controllers with Autotune, Alarms and RS485

1/4 DIN Temperature Controllers


Item# CN733

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 C$244.71
10-24 C$232.47
25-49 C$220.24
50-99 C$208.00
100-499 C$195.77
500+ C$183.53

In stock

Lead Time (If not in stock): 34 weeks
1/4 DIN Temperature Controllers CN733 CN733

This product series currently has an extended lead time. For a potential replacement, please see the CN4000-Series or CNPT-Series

  • Dual Display
  • Autotune
  • RS-485 Communications
  • Free Software

CN733 Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Output Type
Measurement Type
Control Outputs
Form Factor
Number Of Inputs
Input Type
Supply Voltage Type
Display Type

Input Types Range
Pt100Ω RTD 0 to 100°C (32 to 212°F)
-20 to 500°C (-4 to 932°F)
-200 to 600°C (-328 to 1112°F)
B Thermocouple100 to 1800°C (212 to 3272°F)
S Thermocouple 0 to 1700°C (32 to 3092°F)
R Thermocouple 0 to 1700°C (32 to 3092°F)
N Thermocouple -200 to 1300°C (-328 to 2372°F)
E Thermocouple 0 to 600°C (32 to 1112°F)
T Thermocouple -20 to 400°C (-4 to 752°F)
-200 to 400°C (-328 to 752°F)
J Thermocouple -20 to 400°C (-4 to 752°F)
-100 to 850°C (-148 to 1562°F)
K Thermocouple -200 to 1300°C (-328 to 2372°F)
-200 to 500°C (-328 to 932°F)
L Thermocouple -200 to 500°C (-328 to 932°F)
U Thermocouple -200 to 800°C (-328 to 1472°F)
The CN730 Series ¼ DIN temperature controllers offer easy-to-use programming menus designed for quick installation. Control functions include ON/OFF, PID, auto-tunstyle="text-align: center;"ing or manual tuning. The CN730 Series is available with relay, dc pulse or current output with two additional alarm outputs. The alarm outputs can be configured from 12 different preprogrammed settings. The CN730 Series accepts a variety of thermocouple and RTD inputs. Process value and set-point value are simultaneously displayed with the process value in red and setpoint in green.

Inputs: Thermocouple or RTD, see chart
Display: Two 4-digit, 7-segment, LEDs
Resolution: 1 degree
PV: Red, 19 mm (0.75') H
SV: Green, 12.7 mm (0.5') H
Accuracy: ±0.25% span, ±1 least significant digit
Supply Voltage: 100 to 240 Vac, 50/60 Hz
Power Consumption: 5 VA max
Operating Temperature: 0 to 50°C (32 to 122°F)
Memory Backup: Nonvolatile memory
Control Output Ratings:
Relay: SPST, 5A @ Vac resistive
Voltage Pulse: 14V, 10 to -20% (max 40 mA)
Current: 4 to 20 mA
Communication: RS-485 MODBUSR communication protocol
Panel Cutout: ¼DIN, 92 mm square (3.622 square')
Dimensions: 96 x 96 x 15.8 mm bezel (3.78 x 3.78 x 0.625')
Panel Depth: 79.2 mm (3.125')
Weight: 425 g (15 oz)
Front Panel Rating: IP66
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Rated 4 out of 5 by from Decent little controller These little controllers come with a good array of features for the price. However, the mounting clips they come with are cheap, easily broken, and very difficult to get replacements without ordering a whole new controller.
Date published: 2016-09-02
Rated 5 out of 5 by from Powerful controller Very flexible programming. Easy to set up. Difficult to navigate.
Date published: 2024-02-12
Rated 5 out of 5 by from Great Temp Controller Controller was easy to install and program. It’s operation is simple and efficient. Very good quality build. I will use this brand for process controllers moving forward.
Date published: 2020-05-20
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Is the relay electromechanical or solid state? Is the relay enclosed?

Asked by: spock
The CN733 has one Relay: SPST, 5A @ 250 Vac resistive. Thanks for connecting with Omega. Please contact our Tech Support with any further questions.
Answered by: Jane
Date published: 2019-05-15

For the Current Output option, when the controller is tuned correctly, is the 4-20mA output altered to maintain the setpoint or is it just a constant pulse?

Asked by: DJ92
Thank you for your inquiry DJ92. A 4-20 mA output changes depending on how close or far away you are from the setpoint. Therefore, a 4-20 mA is not a constant pulse.
Answered by: Application Engineer MC
Date published: 2024-06-06

I can no longer enter auto tune. When I get to the AT selection, I can't select ON. Is there some way to restore auto tune functionality?

Asked by: Ben H
Hi Anonymous, Please check that you are in PID mode and not in the Program mode for ramp soak. Best regards OMEGA
Answered by: NorwalkAE
Date published: 2021-03-27
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