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CN38S-Series
Temperature Autotune Controller with Sensitive Touch Keypad
Models In Stock
- Easy Programming
- Input for Thermocouple, RTD and Thermistor
- Resolution 0.1°C with Automatic Scale Change (Auto-Ranging)
- “Sensitive Touch” Keypad
CN38S-Series
From
Models In Stock
Product Overview
- Accuracy ± 0.5 %
- Accuracy Detail ± (0.5% span ± 1 digit @25 °C
- Additional Features 1 °C or °F programmable
- Category of Overvoltage II
- DC Pulse Isolation: Output NOT isolated as regard the very low voltage parts; Logic State: 1: 12V ± 20% @ 1 mA, 10V ± 20%; @ 20 mA ; Logic State 0: <0.5V
- Device Class Class II
- Display Size 47 mm (1.9 in)
- Display Type 3 Digit LED
- Display Type Note 3-digit single display, red, 12 mm (0.47")
- Display Updating Time 1 s
- Electrical Connection Screw Terminal
- Enclosure Ratings IP65
- Enclosure Ratings Note Front Protection: IP 65 (with gasket) according to EN60070-1 for indoor use Screw Terminal: IP20
- Form factor 1/8 DIN
- Height 78 mm
- 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)
- Length 64 mm
- Measurement Type Temperature
- Mounting Flush in panel
- Nominal Pulse Voltage 2.5 KV
- Number of Control Outputs 2
- Number of Inputs 1
- Operating Temperature, Max 50 °C
- Operating Temperature, Min 0 °C
- Relative Humidity < 95 RH% without condensation
- Sampling Rate 1 Hz (1 update/second)
- Series ID CN38S-Series
- Storage Temperature, Max 60 °C
- Storage Temperature, Min -25 °C
- Weight 180 g
- Width 35 mm
Supported Applications
The Omega CN38S Series is a microprocessor-based digital electronic controller designed for temperature measurement and control applications. The series features an ergonomic keypad with 'Sensitive Touch' technology intended to provide protection against dust and liquids while allowing direct set-point access. It supports ON/OFF or PID control modes, including autotuning functionality.
Documented sensor compatibility includes:
- Thermocouples: Type J and K
- RTDs: Pt 100 and Pt 1000 (2-wire)
- Thermistors: PTC (990 Ω @ 25°C) and NTC (10 kΩ @ 25°C)
The instrument is intended for indoor use in an electrical panel with exposed terminals. It is not designed for hazardous locations, nor should it be used as safety equipment or in applications where failure may cause dangerous situations.
Operating Conditions & Performance
The CN38S Series operates within a specified ambient temperature range of 0 to 50°C (32 to 122°F) and supports humidity levels up to <95 RH% without condensation. The front panel offers IP65 protection with an optional gasket according to EN60070-1, while the screw terminal block is rated IP20.
Performance specifications vary by input type:
- Accuracy: ±(0.5% span ±1 digit) @ 25°C
- Resolution: 0.1°C with automatic scale change (autorangeing)
- Response Time: Sampling rate of 1 s; display updating time of 1 s
- Storage Temperature: -25 to 60°C (-13 to 140°F)
The controller features a 3-digit red display and includes programmable parameters for set points, alarms, soft start time, compressor protection time, and password-protected configuration.
Measurement Ranges by Sensor Type
- Type J/K Thermocouple: -40 to 999°C (-40 to 999°F)
- RTD (Pt 100, Pt 1000): -50 to 850°C (-58 to 999°F) and -50.0 to 99.9°C (-58.0 to 99.9°F)
- PTC Thermistor: -50 to 150°C (-67 to 302°F) and -50.0 to 99.9°C (-67.0 to 99.9°F)
- NTC Thermistor: -50 to 110°C (-58 to 230°F) and -50.0 to 99.9°C (-58.0 to 99.9°F)
Configuration Options
The CN38S Series is configurable across input types, output signals, and power supply options. The model number follows the format: CN38S-<INPUT_TYPE>-<OUTPUT1>-<OUTPUT2>-<VOLTAGE>.
Input Types
- TC: Thermocouple Type J or K
- RTD: Resistance Temperature Detector (Pt 100, Pt 1000)
- TH: Thermistor (PTC or NTC)
Output Configurations
The series supports two independent outputs with the following options:- R1 / R2: SPDT Relay, 8 A/250 Vac on resistive load (6A AC3/250 VAC), or 3 A/250V
- DC1 / DC2: DC pulse for SSR drive. Not isolated; specifications include 12V ±20% @ 1 mA, 10V ±20% @ 20 mA, and OFF state <0.5V.
Output functions are programmable via parameters to support PID control (heating or cooling action), ON/OFF control, absolute high/low alarms, band alarms, deviation alarms, and second set-point control.
Power Supply Options
The series is available with the following power inputs:- (None): 100 to 240 VAC/VDC (±10%) or 100 to 230 Vac/Vdc (±10% depending on source)
- 12V: 12 VDC isolated (-15% to +10%)
- 24V: 24 VAC/DC (-15% to +10%) or 24 Vac/Vdc (±10%)
Mechanical & Electrical Connections
- Dimensions: Front panel cutout approximately 78 x 35 mm; overall depth varies by housing configuration.
- Mounting: Panel mounting with a maximum thickness of 15 mm. Housing material is plastic, self-extinguishing (V-0 according to UL 94).
- Connections: 11 screw terminals (M3) for cables from 0.25 to 2.6 mm² (AWG 22 to AWG 14).
Key Product Differences
The CN38S Series distinguishes itself through specific input/output combinations and voltage ratings rather than distinct sub-series names.- Input Distinction: Models are designated by -TC-, -RTD-, or -TH- to define the sensor family supported.
- Output Pairing: Variants combine relay outputs (R1, R2) and DC pulse outputs (DC1, DC2). Common configurations include Relay/Relay (R1-R2), Pulse/Pulse (DC1-DC2), or mixed DC1-R2.
- Voltage Suffixes: Standard models operate on 100–240 VAC/VDC. Low-voltage variants are explicitly marked with a suffix of -12V (for 12 VDC isolated) or -24V (for 24 VAC/DC).
- Accessories: A field-installable noise suppression kit, model CNQUENCHARC, is available for 110 to 230 Vac applications.
PDFs & Manuals
