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1/16 DIN Temperature Controllers with Autotune, Alarms and RS485

1/16 DIN Temperature Controllers


Item# CN745

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $147.59
10-24 $140.21
25-49 $132.83
50-99 $125.45
100-499 $118.07
500+ $110.69

In stock

Lead Time (If not in stock): 34 weeks
1/16 DIN Temperature Controllers CN745 CN745

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

  • 1/16 DIN temperature controller with Dual Display
  • Autotune
  • RS-485 Communications
  • Free Software

CN745 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

  • Communication Protocols (Sku Variant) RS-485
  • Analog Input Accuracy ±0.25% span
  • Control/Alarm Outputs, Maximum 1
  • Control Algorithms Autotune PID Manual Control Mode
  • Display Color Red/Green
  • Display Digit Height 6.35 mm
  • Maximum Ambient Temperature 50 {C} (122 {F})
  • Measurement Type Temperature
  • Minimum Ambient Temperature 0 {C} (32 {F})
  • Number of Display Lines (Sku Variant) 2
  • Other Features (Sku Variant) Software
  • RTD Connection 2
  • RTD Curves Supported 385
  • RTD Types Supported RTD( 2
  • Supply Frequency 50/60 Hz
  • Thermocouple Type B
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 CN740 Series temperature controllers offer accurate temperature measurement and control in a 1/16 DIN package. Designed for direct or reverse acting (cooling or heating) control, the CN740 Series can be programmed for simple ON/OFF or more complex PID control functions. PID control is supported with manual or autotuning. Select relay, DC pulse or current output for control methods. The CN740 Series accepts a variety of thermocouple and RTD inputs. Process value and set-point value are displayed simultaneously on the large dual LED. Auto-tuning, engineering units (°F or °C), and alarm status is also indicated on the faceplate. Two alarm outputs are included on the unit with 12 preprogrammed alarm functions.

Inputs: Thermocouple, RTD, see chart
Display: Two 4-digit, 7 segment 6.35 mm (0.25') H LEDs
    PV: Red
    SV: Green
Resolution: 1 degree
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 @ 250 Vac resistive
Voltage Pulse: 14 Vdc, 10 to -20% (max 40 mA)
Current: 4 to 20 mA
Communication: RS-485 MODBUS® communication protocol
Panel Cut-Out: 48 mm square (1.89' square) Maximum Panel
Thickness: 9.50 mm (0.375')
Weight: 114 g (4 oz)
Front Panel Rating: IP66
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Rated 5 out of 5 by from inexpensive, works well. I use this controller to maintain the temp in a molten salt furnace. With the auto tune it holds a constant temp with minimal over shoot and fast reaction time.
Date published: 2016-03-03
Rated 2 out of 5 by from Reliability is marginal Originally had six units, three failed after 1 year. The internal relay contacts became intermittent, one fused in the "on" position. They are only switching 2 amps, and are rated for 5.
Date published: 2017-02-24
Rated 4 out of 5 by from 1/16 DIN Temperature Controllers Product works well and can easily be integrated with most controls systems. The only complaint is that the lead time is often quite long if the items are not in stock.
Date published: 2023-11-06
Rated 2 out of 5 by from Incorrect controller purchased Cannot give a good rating becauae I was unable to use this product due to incorrect purchase. I found it difficult to select the correct type of controller on the site.
Date published: 2023-03-12
Rated 5 out of 5 by from good price, works perfec, twe can use for temperature, RH, presu
Date published: 2021-10-16
Rated 5 out of 5 by from Controller features have On/Off and PID Control Because this controller has both On/Off & PID Control I was able to configure it to my oven.
Date published: 2018-03-28
Rated 5 out of 5 by from Great Service Bought this recently and pleased that I did, it performs as advertised.
Date published: 2017-10-26
Rated 5 out of 5 by from Amazing little control marvel Great product with the right features. It does just what I need from a proportional control
Date published: 2017-02-23
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For the CN745, I did not see an "Output" option in the Communication Parameters List. Does this exist?

Asked by: NEXT
Thank you for the inquiry. Please forward this question to TEMP@OMEGA.COM so that we can better support you. Best regards OMEGA
Answered by: AENwlk
Date published: 2021-09-13

for CN745, the product does require any solid state relay? I am not sure that in case of current output control any solid state relay is required. Could you recommend any solid state relay or items which are required to be purchased with the CN745?

Asked by: Wonsang
Output #1 is an analog control output that can be programmed using the PID tuning control your process. You can either manually tune the PID values, or use Auto tune providing the process is for temperature and you have a set point at least 100 degrees (C or F) above your starting ambient temperature.
Answered by: Application Engineer JB
Date published: 2021-09-13

Can this model be used for over-temperature protection?

Asked by: Kathy E
Hi Kathy, The CN743 would not be recommended for use as a limit controller. The CN2516-R1 would be a 1/16 DIN size controller that would be suited for use as an over-temperature limit controller. It has the ability to latch which is what you'll want as a feature in a true limit controller.
Answered by: Engineer9
Date published: 2021-09-13

Can you please share connection for CN743 with out SSR? I need to connect it with out using SSR. Please share the power supply connection for this.

Asked by: Ravi09
Thank you for your inquiry. Due to this being a more complicated issue please call 1-888-826-6342, ask for Temperature Engineering or send an email to
Answered by: Application Engineer MC
Date published: 2023-06-09

Does CN740 comes with mounting bracket?

Asked by: Gireesh
Thank you for your inquiry. The mounting bracket is included.
Answered by: Application Engineer CB
Date published: 2023-11-22

I would like to speak with a technical rep regarding the operation of the CN74-3 temp controller. I am Working from Home (WFH). I do not have controller in front of me (located 34 miles from here).

Asked by: AlanW
Thank you for your inquiry. Feel free to call our Temperature Group at 1-888-826-6342 to discuss application. We are available until 6:30 EST
Answered by: Application Engineer JB
Date published: 2021-09-13

Does cn743 model comply with REACH and RoHS ?

Asked by: Anna220284
Thank you for your inquiry. Unfortunately this product does not comply with RoHS and/or REACH.
Answered by: Application Engineer CB
Date published: 2022-07-07

Does CN743 require SSR? Can you please explain connection in video? By the Data file i can not understand the connections.

Asked by: Ravi09
Thank you for the inquiry. The answer will depend on if your load pulls over the maximum current rating for the CN743's relay, which is 5 Amps. If your load pulls under 5 Amps, you will not require an SSR.
Answered by: Application Engineer SP
Date published: 2023-06-09
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