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CN740-Series
1/16 DIN Temperature Controllers with Autotune, Alarms and RS485
Models In Stock
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
CN740-Series
From
$
153.86
Models In Stock
Product Overview
- Accuracy ± 0.25 %
- Accuracy Note ± 0.25% span, ± 1 least significant digit
- Data Interface RS485 Modbus
- Depth Behind Panel 80 mm
- Display Size 6.35 mm (.25 in)
- Display Type 4 Digit LED
- Display Type Note 3.5 Digit Dual Display, Two 4-digit, 7 segment 6.35 mm H (0.25") LEDs PV: Red SV: Green
- Enclosure Ratings IP66
- Form factor 1/16 DIN
- Front Bezel 48 mm²
- Input Type Thermocouple, RTD, Thermistor
- Measurement Type Temperature
- Measuring Range Type B : 100 to 1800°C, Type S : 0 to 1700°C, Type R : 0 to 1700°C, Type N : -200 to 1300°C, Type E : 0 to 600°C, Type T : -20 to 400°C, -200 to 400°C, Type J : -20 to 400°C, -100 to 850°C, Type K : 200 to 1300°C, -200 to 500°C, Type L : -200 to 500°C, Type U : -200 to 800°C, RTD : 0 to 100°C, -20 to 500°C, -200 to 600°C
- Memory Backup Non-Volatile
- Number of Control Outputs 1
- Number of Inputs 1
- Operating Temperature, Max 50 °C
- Operating Temperature, Min 0 °C
- Panel Thickness, Max 9.5 mm
- Supply Power Note 100 to 240 Vac, 50/60 Hz
- Supply Power Type AC
- Supply Voltage 100 to 240 Vac
- Weight 114 g
| 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) |
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
PDFs & Manuals
Software & Drivers
Show Ratings & 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
Does Omega certify or if necessary, re-calibrate the CN742 controller for temperature and 4-to-20MA output. Target temp. is 80F. Does a new controller come certified?
Thank you for your inquiry. We do not re-calibrate this unit.
Date published: 2024-06-14
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?
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
Date published: 2021-09-13
Can this model be used for over-temperature protection?
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.
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.
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
Date published: 2023-06-09
Does CN740 comes with mounting bracket?
Thank you for your inquiry. The mounting bracket is included.
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).
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
Date published: 2021-09-13
Does cn743 model comply with REACH and RoHS ?
Thank you for your inquiry. Unfortunately this product does not comply with RoHS and/or REACH.
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.
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.
Date published: 2023-06-09