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

1/16 DIN Temperature Controllers

4.2

(9)

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Data Sheet (PDF)

$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

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Lead Time (If not in stock): 34 weeks

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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

View Specs

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

Specs

Edit Model Options

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 Thermocouple	100 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

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Reviews

Rated 5 out of 5 by Just some guy 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 Mr Z 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 MaryP 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 MDIAS LLC 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 oventec from good price, works perfec, twe can use for temperature, RH, presu

Date published: 2021-10-16

Rated 5 out of 5 by John6800 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 Bobble 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 Nare 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

1/16 DIN Temperature Controllers Reviews - page 2

Manuals & Downloads

Manuals & Guides (1)

CN740-Series_manual user manual

Data Sheet (1)

CN740-Series_spec

Compliance Certificates (3)

RoHS 2015/863 - View Certificate
CE Approved
UL cULus Listed

Software, Firmware, & Drivers (1)

Software

Articles (2)

Questions & Answers

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 temp@omega.com

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