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  5. Select Series | 22.5mm x 96mm  L22

Select Series | 22.5mm x 96mm

L22
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Process Limit Controller

• Fuzzy PID control for fast response
• Dual output for heat/cool or alarm
• Auto-tuning for easy setup
• RS-485/RS-232 Modbus RTU
• Compact board for embedded use

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Features Applications Specification Download FAQ Ordering Code

Features

  • Universal input with wide sensor support
  • 18-bit A/D for accurate signal conversion
  • 2 relay outputs for limit and alarm
  • Optional analog retransmission (mA/V)
  • Remote reset and lock input available
  • Modbus RTU communication via RS-485
  • Multi-mode alarm configuration
  • Output types: Relay, SSR, Triac
  • Dual display for PV and SP values
  • Selectable °C/°F unit indication
  • LED indicators for output status
  • Panel or PC software parameter setup
  • Compact 22.5mm DIN width saves space
  • CE, UL, FM safety certified
  • IP50 front panel and IP20 terminals

L22 Limit Controller for Compact Safety

Slim DIN-rail unit with fast and flexible protection

The L22 limit controller delivers reliable over-temperature protection in a compact DIN-rail design that saves space while ensuring safety. Featuring high-speed 5Hz sampling and universal input, it detects abnormal process conditions in real time. Dual relay outputs offer flexible shutdown or alarm options. With optional Modbus communication and remote reset functions, the L22 helps reduce downtime and improve production line safety. It’s an excellent choice for compact machinery, OEM systems, or distributed safety panels where size and performance both matter.


Intuitive Front Panel Operation

Clear display with quick-access buttons and LED indicators

The L22 features a compact LED display showing process value, status, and unit. Four tactile keys provide fast access to parameter navigation, setpoint editing, and system setup. Status indicators include output activity, unit (°C/°F), and lock status. This layout ensures easy, error-free operation even in low-light environments, and helps operators avoid accidental setting changes during production.

Universal Input for Process Signals

Accepts thermocouple, RTD, voltage and current

L22 accepts a wide range of input types including thermocouples (J, K, T, E, etc.), PT100 RTDs, and linear analog signals such as 0–60mV, 0–10V, and 4–20mA. Input type and range are easily selectable via the front keypad or PC software. This flexibility allows seamless integration with a wide range of process sensors in temperature, pressure, and flow control applications.

Flexible Output for Protection & Alarm  

Supports relay, SSR, Triac and analog retransmission

L22 provides two output channels configurable as limit control or alarms. Output types include relay, SSR drive (5V/14V), or Triac. Alarm 2 and analog retransmission are available as optional add-ons for enhanced functionality. With customizable alarm modes and reliable output switching, L22 ensures dependable shutdown or notification when limits are exceeded.

Programming Port for Easy Setup

Connects to PC software for cloning and configuration

L22 features a built-in Micro USB programming port designed for offline configuration, firmware updates, and automatic testing. With the use of BrainChild’s programming cable (CC98-1) and adapter (PA98-1), users can connect the device to a PC or ATE (Automatic Test Equipment) system for efficient pre-deployment setup. This port is not intended for use during regular operation and should only be connected when the unit is powered but not actively controlling a process.

BC-SET Pro Configuration Software

Easy parameter setup, backup and firmware upgrade  

BC-SET Pro is the official configuration software developed by BrainChild for its over-temperature protection controllers. With a streamlined and intuitive interface, the software allows users to connect via USB programming cable and quickly configure control parameters. It supports efficient parameter editing, setting duplication between devices, and firmware upgrades to maintain device performance and stability. BC-SET Pro also enables offline configuration with the ability to save and manage multiple profiles, making it ideal for production environments, system deployment, and ongoing maintenance. Whether for new setup or existing system adjustment, this tool helps engineers and technicians simplify workflow, reduce setup time, and ensure consistent configuration across all devices.

Batch Read/Write for Multiple Controllers 

BC-SET allows users to connect multiple controllers of the same model and perform batch parameter read/write by defining a node address range. This feature significantly streamlines configuration in OEM or multi-device environments.

Clear and Accessible System Menu 

The system menu offers quick access to key operations like Rescan (F5), Read Data (F6), Write Data (F7), Write Multiple (F8), and Communication Settings (F9). Built-in hotkeys support fast, efficient navigation.

Intuitive Communication Setup Interface

The communication settings window lets users define COM port, baud rate, parity, data bits, and stop bits — with a “Default” button for quick reset and “Save and Exit” to finalize setup. Designed to reduce setup errors.

Visual Profile Editor for Programmable Controllers 

For controllers with profile functionality, BC-SET provides a graphical editor to configure temperature ramp/soak segments. Users can easily read, modify, and write profile parameters for precise thermal process control.

IP-rated Protection for Industrial Use

IP50 front panel and IP20 terminals housing

The L22 is built with an IP50-rated front panel for dust protection and IP20-rated housing for terminals and rear components. This rating is ideal for clean indoor industrial settings such as electrical panels or PLC enclosures. The design ensures reliable long-term operation by reducing exposure to dust and unintended contact.

Applications

Specification

 


 Power

Power Supply

90 ~ 250VAC, 47 ~63Hz, 20 ~ 28 VAC, 47-63Hz / 11 ~ 40 VDC

Power Consumption

8VA, 4W maximum

Over Voltage Category

II
 Signal Input

Type

Thermocouple (J, K, T, E, B, R, S, N, L, U, P, C, D), RTD(Pt100(DIN), Pt100(JIS)), Current(mA), Voltage (V, mV)

Resolution

18 Bits

Sampling Rate

5 Times / Second (200msec)

Maximum Rating

-2VDC minimum, 12VDC maximum

Input characteristics

Type

Range

　Accuracy@ 25 °C

Input Impedance

J

-120°C ~ 1000°C D115( -184°F ~ 1832°F)

±2 °C

2.2MΩ

K

200°C ~ 1370°C (-328°F ~ 2498°F)

±2 °C

2.2MΩ

T

-250°C ~ 400°C ( -418°F ~ 752°F)

±2 °C

2.2MΩ

E

-100°C ~ 900°C ( -148°F ~ 1652°F)

±2 °C

2.2MΩ

B

0°C ~ 1820°C (32°F ~ 3308°F)

±2 °C (200°C - 1800°C)

2.2MΩ

R

0°C ~ 1767.8°C (32°F ~ 3214°F)

±2 °C

2.2MΩ

S

0°C ~ 1767.8°C (32°F ~ 3214°F)

±2 °C

2.2MΩ

N

-250°C ~ 1300°C ( -418°F ~ 2372°F)

±2 °C

2.2MΩ

L

-200°C ~ 900°C ( -328°F ~ 1652°F)

±2 °C

2.2MΩ

U

-200°C ~ 600°C (-328°F ~ 1112°F)

±2 °C

2.2MΩ

P

0°C ~ 1395°C (32°F ~ 2543°F)

±2 °C

2.2MΩ

C

0°C ~ 2300°C (32°F ~ 4172°F)

±2 °C

2.2MΩ

D

0°C ~ 2300°C (32°F ~ 4172°F)

±2 °C

2.2MΩ

PT100 (DIN)

-210°C ~ 700°C ( -346°F ~ 1292°F)

±0.4°C

1.3KΩ

PT100 (JIS)

-200°C ~ 600°C ( -328°F ~ 1112°F)

±0.4°C

1.3KΩ

mA

-3mA ~ 27mA

±0.05%

2.5Ω

VDC

-1.3VDC ~ 11.5VDC

±0.05%

1.5KΩ

mV

0 ~ 50mV

±0.05%

2.2MΩ

Temperature Effect

1.5μV /°C for all inputs except mA input, 3.0μV /°C for mA

Sensor Lead Resistance Effect

Thermocouple: 0.2 μV / Ω; 2-wire RTD: 2.6°C /Ω of sum of resistance of two leads; 3-wire RTD: 2.6°C /Ω of difference of resistance of two leads

Burn-out Current

200nA

Common Mode Rejection Ratio(CMRR)

120 dB

Normal Mode Rejection Ratio (NMRR)

55dB

Sensor Break Detection

Sensor open for Thermocouple, RTD and mV inputs, Sensor short for RTD input, Below 1mA for 4 ~ 20mA input, Below 0.25VDC for 1 ~ 5VDC input, Not available for other inputs.

Sensor Break Responding Time

Within 4 seconds for Thermocouple, RTD and mV inputs, 0.1 second for 4 ~ 20mA and 1 ~ 5VDC inputs.

 

Digital Filter

Function

First Order

Time Constant

0,0.2, 0.5, 1, 2, 5, 10, 20, 30, 60 Seconds Programmable
 Event Input

Number of Event Inputs

1

Logic Low

-10V minimum, 0.8V maximum.

Logic High

2V minimum, 10V maximum

Functions

Remote lock, Remote reset output1, HSP2, LSP2, HLS2, HSP3, LSP3, HLS3, Reset alarm1, Reset alarm2, Reset alarm 3, Reset all alarms, Cancel latch, Reset reference data
Output 1  / Output 2

Limit Control Function

High Limit, Low Limit and High / Low Limit

Type

Relay, Pulsed Voltage

Relay Type

Form A

Relay Rating

2A, 240V AC, 200000 Life cycles for resistive load

Pulsed Voltage

Source voltage 5VDC, Current limiting resistance 66Ω

Temperature Effect

±0.01% of Span/ °C
Alarm

Relay Type

Form A

Maximum Rating

2A, 240VAC, 200000 Life cycles for resistive load

Alarm Functions

Process High, Process Low

Alarm Mode

Latching, normal, Latching reverse, Normal reverse
 Data Communication

Interface

RS-485 or RS-232

Protocol

Modbus RTU (Slave Mode)

Address

1 ~ 247

Baudrate

2.8KBPS ~ 115.2 KBPS

Parity Bit

None, Even or Odd

Stop Bit

1 or 2 Bits

Data  Length

7 or 8 Bits

Communication Buffer

160 Bytes
Analog Retransmission

Output Signal

4 ~ 20mA, 0 ~ 20 mA, 0 ~ 10VDC

Resolution

15 Bits

Accuracy

±0.05% of Span ± 0.0025% / °C

Load Resistance

0 to 500Ω for Current Output , 10KΩ minimum for Voltage Output

Output Regulation

0.01% for full load change

Output Setting Time

0.1 Second (Stable to 99.9%)

Isolation Breakdown

1000 VAC minimum

Integral Linearity Error

±0.005% of Span

Temperature Effect

±0.0025% of Span /°C

Saturation Low

0mA or 0VDC

Saturation High

22.2mA or 5.55V, 11.1V min

Linear Output Ranges

0 ~ 22.2mA (0 ~ 20mA / 4 ~ 20mA), 0 ~ 5.55VDC (0 ~ 5VDC / 1 ~ 5 VDC), 0 ~ 11.1VDC (0 ~ 10VDC)

User Interface

Keypad

4 Keys

Display Type

4 Digit LCD Display

No. of Display

2

Upper Display Size

0.31” (8mm)

Lower Display Size

0.25” (6.5mm)
 Environmental and Physical Specifications

Operating Temperature

-10°C ~ 50°C

Storage Temperature

-40°C ~ 60°C

Humidity

0 ~ 90 % RH (Non-Condensing)

Altitude

2000 Meters maximum

Pollution

Degree II

Insulation Resistance

20 MΩ minimum (@500 VDC)

Dielectric Strength

2000 VAC, 50 / 60 Hz for 1 Minute

Vibration Resistance

10 ~ 55 Hz , 10m / s² for 2 Hours

Shock Resistance

200 m / s² (20g)

Moldings

Flame Retardant Polycarbonate

Mounting

DIN-Rail

Dimensions (W*H*D) (mm)

22.5*96*83

Depth Behind Panel (mm)

-

Cut Out Dimensions (mm)

-

Weight (grams)

160
Approval Standards

Safety

FM Class 3545, UL61010-1, CSA 22.2 No.61010-1-12, EN61010-1 (IEC1010-1), ROHS, REACH

Protective Class

IP50 for the front panel, IP20 for rear terminals and housing. All indoor use.

EMC

EN61326

Download

SelectSeries_L22&L42&L62_Catalog_ver1.4_EN
CoreSeries_Temperaturecontroller_QuickStartGuide_UMQOC621C_EN

CoreSeries_Temperaturecontroller_QuickStartGuide_TCEQSC01B_v2_CH
SelectSeries_L22&L42&L62_UserManual_UM0L62C_EN

Software_BC_Set_2.0
Software_BC_Set_Pro_V1.1.0.12_2.0(above V01)
Software_USB_Update_Tool_V2.8B1

Software_DAQ_V2.73(2501)*1-hour trial only
Training_Demo_Data_Acquistion_Studio

Data_Logger_Firmware_XH10_v1.1.0.34​

Software_BC_Set_Pro_V1.1.0.12_2.0​
Software_DAQ_V2.73(2501)*1-hour trial only

Training_Demo_Data_Acquistion_Studio

UMEIO01A​
UMEIO01A​

IO_Brouchure_Ver.1.4/

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FAQ

The L22 is a compact DIN-rail mounted limit controller designed for over-temperature protection. It monitors process values and triggers output when limits are exceeded to protect equipment and ensure safety in critical systems.

L22 supports universal input, including thermocouples (J, K, T, E, etc.), PT100 RTD sensors, and analog signals like 0–60 mV, 0–10 V, and 4–20 mA. Input type and range can be configured via keypad or software.

The L22 offers two relay outputs for limit control and alarms. Optional analog retransmission (4–20 mA or 0–10 V) and Modbus RTU communication over RS-485 are also available for advanced integration.

Yes. The L22 includes a Micro USB programming port. With a BrainChild programming cable and adapter, users can connect to BC-SET Pro software for offline setup, parameter cloning, and firmware updates.

Where is the L22 suitable to be installed, and what is the protection level?

The L22 is DIN-rail mountable and ideal for compact control panels or distribution boxes. It features IP50 protection at the front and IP20 at the terminal housing, suitable for clean indoor environments.

Ordering Code

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