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Temperature Autotune Controller with Sensitive Touch Keypad

Temperature Controller with Sensitive Touch Keypad


Item# CN38S-TC-R1-R2

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $201.78
10-24 $191.69
25-49 $181.60
50-99 $171.51
100-499 $161.42
500+ $151.34

In stock

Lead Time (If not in stock): 8 weeks
Temperature Controller with Sensitive Touch Keypad CN38S-TC-R1-R2 CN38S-TC-R1-R2
  • Easy Programming
  • Input for Thermocouple, RTD and Thermistor
  • Resolution 0.1°C with Automatic Scale Change (Auto-Ranging)
  • “Sensitive Touch” Keypad

CN38S-TC-R1-R2 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.

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

  • Analog Input Accuracy ±(0.5% span ±1 digit @25 °C)
  • Control/Alarm Outputs, Maximum 2
  • Control/Alarm Outputs, Standard 2 Relay Alarm Outputs
  • Control Algorithms Autotune PID
  • Display Color Red
  • Display Digit Height 12 mm
  • Maximum Ambient Humidity 95% RH non-condensing
  • Maximum Ambient Temperature 50 {C} (122 {F})
  • Maximum Storage Temperature 60 {C} (140 {F})
  • Measurement Type Temperature
  • Minimum Ambient Temperature 0 {C} (32 {F})
  • Number of Display Lines (Sku Variant) 1
  • Other Features (Sku Variant) Sensitive Touch Keypad Low Voltage
  • RTD Connection 2 wire
  • RTD Curves Supported 385
  • RTD Types Supported RTD (2wire 100
  • Sampling Rate 1 s
  • Thermistor Types Supported (Sku Variant) PTC: 990 Ω @ 25°C NTC: 10 kΩ @ 25°C
  • Thermocouple Type J
Monitor and control temperature with precision using the CN38S Series controllers. The CN38S Series offers an innovative solution for programming through an ergonomic keypad which uses the technology “Sensitive Touch”. This sensor keyboard guarantees complete protection from dust and liquids in every critical environmental situation. Providing on/off control or PID control with Autotune, this controller is the solution for many applications. The CN38S series offers a soft start feature. This function makes it possible to eliminate thermal shock and mechanical stress (due to dilatation) that a system undergoes during start up. In other cases the aim is that of slowing down the increase in temperature in such a way that this can spread itself out evenly inside the material, especially when the machine is equipped with ‘stirrers’ that cannot be started up at room temperature. The CN38S also offers a compressor protection time feature, where some actuators, compressors, and pumps cannot be turned off or turned back on too quickly for their constructive characteristics. To protect the working life of the device it therefore becomes essential to be able to activate a timer that guarantees the minimum time between the switching off of the machine and the following start up.

Power Supply: 12 Vac/Vdc, 24 Vac/Vdc, 100 to 230 Vac/Vdc (±10%)
Power Consumption: Maximum 6VA
Device Class: Class II
Nominal Pulse Voltage: 2.5 KV
Category of Overvoltage: II
Isolation: Reinforced isolation between low voltage (input and output relay) and frontal parts; reinforced isolation between low voltage and very low voltage parts (inputs, static outputs)
Thermocouple Input
Type: J, K programmable
Resolution: 0.1°C with automatic scale change
Unit of Measurement: °C or °F programmable
Cold Junction: Automatic compensation 0 to 50°C
Cold Junction Accuracy: 0.1°C/°C @ 25°C after a warm-up (instrument switch-on) of 20 minutes
Calibration: According to EN 60584-1
Burn-Out: At the end of scale
Thermocouple Type Range:
    J: -40 to 999°C (-40 to 999°F)
    K: -40 to 999°C (-40 to 999°F)
Type: Pt 100 and Pt 1000, 2-wire
Resolution: 0.1°C with automatic scale change
Unit of Measurement: °C or °F programmable
Burn-Out: At the end of scale
RTD Range: -50 to 850 (-58 to 999°F) -50.0 to 99.9 (-58.0 to 99.9°F)
Thermistor Input
    PTC: 990 Ω @ 25°C
    NTC: 10 kΩ @ 25°C
Unit of Measurement: °C or °F programmable
Model Range:
    PTC: -50 to 150°C (-67 to 302°F), -50.0 to 99.9°C (-67.0 to 99.9°)
    NTC: -50 to 110°C (-58 to 230°F), -50.0 to 99.9°C (-58.0 to 99.9°F)
Output: 1 and 2
Function: Control output
Output Action: Direct/reverse, programmable
Type: Relay output
Contact: SPDT
Contact Load: Out 1 - 8 A/250 Vac on resistive load - 3 A/250V
Relay Electric Life: 100,000 operations
DC Pulse:
    Isolation: Output NOT isolated as regard the very low voltage parts
    Logic State:
      1: 12V ±20% @ 1 mA, 10V ±20% @ 20 mA
      0: <0.5V
Mounting: Flush in panel
Dimensions: 78 x 35 mm (3.07 x 1.38'), depth 64 mm (2.52')
Panel Cut-Out: 71 (2.8') x 29 (1.14')
Display: 3-digit single display, red, 12 mm (0.47')
Weight: 180 g (6.3 oz) approximately
Screw Terminals: 11 screw terminals (screw M3 for cables 0.25... 2.5 mm2 or AWG 22... AWG 14)
Protection Degree:
    Front Protection: IP 65 (with gasket) according to EN60070-1 for indoor use
    Screw Terminal: IP20
Operating Temperature: 0 to 50°C (32 to 122°F)
Operating Humidity: < 95 RH% without condensation
Storage Temperature: -25 to 60°C (-13 to 140°F)
Overall Accuracy: ±(0.5% span ±1 digit @25 °C)
Sampling Rate: 1 s
Display Updating Time: 1 s
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Rated 5 out of 5 by from It's the Bomb! This little unit works sweet. If you need a 12 volt controller, this is the bomb! I am using this as a fan control for my rocket stove. I needed a higher sensor range than I could get with the 15 dollar Inkbird controller. I haven't had much experience with controllers other than an Inkbird 120v that I used for an old coffee vending machine @ 95c max, and Omega CN7500 120v that I used for a kiln. It seems easy enough to operate. NOTE, the sensor must be isolated. I blew up the first two (my fault) by not isolating the probe from the metal frame of the rocket stove.
Date published: 2017-10-03
Rated 3 out of 5 by from Misleading! The specification sheet shows the unit supporting both Pt100 and Pt1000 sensors, so I ordered the RTD unit only to discover that it supports ONLY Pt100. For Pt1000 support you need to buy the thermistor unit!! The product selection tool and the specifications page make no mention of this - this detail is buried in the manual.
Date published: 2022-05-02
Rated 3 out of 5 by from Works as needed. Should have more features. Disappointed in the missing options. Manual shows options that are not available on device. The option to enable decimal point is not installed. Does not make sense as it is a basic function. The menu skips over that option. They do not tell you this and do not give you the model that allows this function.
Date published: 2021-12-22
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loading all QA

Cn 38s&nbsp; Does this unit have a built in dc rectifier?

Asked by: Jonny
Hi Jonny, Thank you for the inquiry. Yes, the DC rectifier is built in. Best regards, OMEGA
Answered by: NorwalkAE
Date published: 2020-05-19

Hello, can I use it with an external temperature sensor ? I always need to know the temperature inside my product to adapt the voltage and get as close as possible to the desired temperature. Thank's

Asked by: Titouan
The CN38S series does accept Thermocouples RTD's and Thermistors to display temperature.
Answered by: ApplicationsEngineer ANB
Date published: 2023-07-10

I want to use this with 10k NTC thermistors, but I need to know which temperature curve it is designed for. For example: 3969K

Asked by: Verimod
Thank you for your inquiry. You may use the NTC 10k curve. This would be Thermistors 44006 or 44031 located on our &quot;Thermistor Resistance Temperature&quot; table located in the RTD &amp; Thermistor Reference Data category at this technical reference:
Answered by: Application Engineer CK
Date published: 2021-12-23

I'm trying to use the CN38S-TC-DC1-DC2 with a refrigerator and set the &quot;PCT&quot; &quot;compressor protection time&quot; to 5 minutes. this wait-time is however ignored and it keeps switching on and off within a few seconds. does &quot;PCT&quot; only work in On/OFF mode?

Asked by: Anonymous
Thank you for contacting Omega. The PCT feature is only available if at least one output is programmed as cooling. With the controller being connected to a refrigerator, that would be a cooling application. Our Tech Support engineer has emailed you to confirm that you do have the controller programmed for cooling and help resolve this for you.
Answered by: Jane
Date published: 2019-06-20

Hello! Does this PID controller work with a 2252 NTC thermistor?

Asked by: EE Alex
Thank you for your inquiry. No, this PID controller does not work with a 2252 ohm NTC thermistor.
Answered by: Application Engineer SP
Date published: 2022-09-28
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