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

1/16 DIN Temperature Controllers
4.2
(9)
1/16 DIN Temperature Controllers
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Data Sheet (PDF)

  • RoHS Icon
  • CE Approved
  • UL cULus Listed

$147.59

Item# CN743

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
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1/16 DIN Temperature Controllers CN743 CN743

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

CN743 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
Communications
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.

SPECIFICATIONS
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
Rated 5 out of 5 by from CN740 Series Temperature Controller Omega, I recently perched a PID Temperature Controller, model CN745, in a 1/16 DIN package form you and found it to be a very good product at a reasonable price. I am very happy with it. Thanks again. Mike Carpenter
Date published: 2016-02-21
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What is manual control mode? Does auto tune mean P,I,D values will be determined by device itself?

Asked by: Hero
Manual mode is used when you have an analog output option Controller. It allows you to select the percentage of the low or high output range to be delivered to the load.
Answered by: ApplicationsEngineerANB
Date published: 2024-01-16

I'm confused what the "relay" output means. Does that mean that I do not need a separate solid state relay? My understanding was to use this and connect the output to a SSR, however I am now now sure

Asked by: BigFatBunny
Thank you for your inquiry! The answer will depend on if your load pulls over the maximum current rating for the CN743's relay, which is 5A. If your load pulls under 5A, you will not require an SSR. Application Engineer CK
Answered by: Application Engineer CK
Date published: 2021-10-08

Can the software in this device ramp up or down the temperature depending on the time I set it to? Or is this just a simple turn on / off software ?

Asked by: Engineer_55
Thank you for your inquiry. Unfortunately, this unit does not have the ramp & soak feature. Refer to its counterpart CN7800 that does.
Answered by: Application Engineer CB
Date published: 2023-07-06

Does the CN 743 have a built in relay? Do you need a Solid state relay to operate this model?

Asked by: BAMA HEAT
The CN743 has a Single Pole Single throw built in relay for Output 1 and additional alarm relays. It is rated at 5 Amps at 240 VAC so can directly be used with moderate size loads directly.
Answered by: ApplicationsEngineerANB
Date published: 2024-02-09

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

Is the relay output just a simple on/off signal? Is the DC Pulse a PWM signal, and, if so, what is the duty cycle and frequency range?

Asked by: ajrs
Hi AJRS, Both relay and pulse outputs can be used as PID control. Output is based on cycle time not PWM and is set by user. Cycle time down to 1 second is available. But fastest relay cycle time should limited to 7 to 10 seconds. Best regards
Answered by: NorwalkAE_RS
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 parameters.to 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
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