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L91 Limit Controller
L91 Limit Controller - Side View
L91 - Image 3
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L91 Limit Controller
L91 Limit Controller - Side View
L91 - Image 3

L91 – 48 x 48mm Safety Limit Controller

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$296.00 Excl. GST

Select Model*

Standard Input : Thermocouple, RTD Pt100, mV 0-60mV

Total: $296.00

All prices are in NZ$, and GST exclusive and are subject to change without notice.

Product Details

L91 Limit Controller
Compact Safety for Temperature Protection  

Designed for industrial over-temperature monitoring and alarm safety

The L91 from BrainChild is a microprocessor-based limit controller engineered for precise over-temperature protection in industrial systems. With universal input compatibility (TC, RTD, voltage, current), latching relay output, and dual display interface, the L91 ensures fast and reliable safety responses. Its output flexibility includes relay, SSR, or TRIAC, while Output 2 supports expansion to alarms, Modbus communication, or analogue retransmission.

Real-Time Display with Function Keys

Monitor PV, outputs, alarms, and status at once

The L91 panel adopts a compact yet efficient layout, featuring a high-visibility 4-digit red LED display to present real-time process values. The four-key interface includes Scroll, Up, Down, and Reset (R) buttons, allowing users to navigate menus, adjust parameters, and reset alarms efficiently. The Reset key also supports unlock/confirm actions via long press. The panel further includes a LOCK status LED, which secures access against unauthorized configuration changes.

Universal Input Compatibility for Accurate Monitoring

Supports TC, RTD, Voltage, Current, and mV Signals

The L91 is equipped with a high-precision 18-bit A/D converter and supports a wide variety of input signals including thermocouples (J, K, T, E, B, R, S, N, L), RTDs (PT100 DIN and JIS), low voltage (mV), standard voltage (0–1V, 0–10V), and current (0–20mA). With a sampling rate of 5 times per second (200ms), it ensures rapid response and stable measurement. Additional protections such as sensor break detection and programmable digital filtering enhance system reliability and measurement stability.

L91 Features:

  • 4-digit LED display with status icons
  • Lockout function for secure operation
  • 1/16 DIN compact panel mounting
  • Sampling rate: 5 times per second
  • Output 2 supports alarm, RS-485, power, retransmit
  • Alarm annunciator and event input available
  • Modbus RTU protocol support via RS-485
  • 18-bit A/D resolution for high precision
  • Output indicators (OP1, OP2), °C/°F display

Technical Specs

Power
90 – 250 VAC, 47 – 63 Hz, 10VA, 5W maximum
11 – 26 VAC / VDC, SELV, Limited Energy, 10VA, 5W maximum

 

Input 1 Characteristics
Resolution 18 bits
Sampling Rate 5 times / second
Maximum Rating -2 VDC minimum, 12 VDC maximum ( 1 minute for mA input )
Temperature Effect ±1.5 uV/ °C
Sensor Lead Resistance Effect T/C: 0.2uV/ohm

3-wire RTD: 2.6 °C/ohm of resistance difference of two leads

2-wire RTD: 2.6 °C/ohm of resistance sum of two leads 200nA
Common Mode Rejection Ratio ( CMRR ) 120dB
Burn-out Current 200nA
Sensor Break Detection Sensor open for TC, RTD and mV inputs, Sensor short for RTD input, below 1 mA for 4-20 mA input, below 0.25V for 1 – 5 V input, unavailable for other inputs.
Sensor Break Responding Time Within 4 seconds for TC, RTD and mV inputs, 0.1 second for 4-20 mA and 1 – 5 V inputs.

 

TYPE Range Accuracy@25°C Input Impedance
J -120°C -1000°C (-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 – 1820°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
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
mV -8mV -70mV ±0.05% 2.2M?
mA -3mA -27mA ±0.05% 70.5Ω
V -1.3V-11.5V  ±0.05% 302KΩ

 

Event Input
Logic Low Logic -10V minimum, 0.8V maximum.
Logic High 2V minimum, 10V maximum.
Functions Remote reset, remote lockout.

 

Output 1 / Output 2
Relay Rating 2A/240 VAC, life cycles 200,000 for resistive load
Pulsed Voltage Source Voltage 5V, current limiting resistance 66Ω

 

 

Triac ( SSR ) Output
Rating 1A / 240 VAC
Inrush Current 20A for 1 cycle
Min. Load Current 50 mA rms
Max. Off-state Leakage 3 mA rms
Max. On-state Voltage 1.5V rms
Insulation Resistance 1000 Mohms min. at 500 VDC
Dielectric Strength 2500 VAC for 1 minute

 

DC Voltage Supply Characteristics ( Installed at Output 2 )
Type Tolerance Max. Output Current Ripple Voltage Isolation Barrier
20V ±1 V 25 mA 0.2 Vp-p 500 VAC
12V ±0.6 V 40 mA 0.1 Vp-p 500 VAC
5V ±0.25 V 80 mA 0.05 Vp-p 500 VAC

 

Data Communication
Interface RS-232 ( 1 unit ), RS-485 ( up to 247 units )
Protocol Modbus Protocol RTU mode
Address 1 – 247
Baud Rate 0.3 ~ 38.4 Kbits/sec
Data Bits 8 bits
Parity Bit None, Even or Odd
Stop Bit 1 or 2 bits
Communication Buffer 50 bytes

 

User Interface
4-digit LED Displays 0.4″ (10mm),
Keypad 4 keys
Programming Port For automatic setup, calibration and testing
Communication Port Connection to PC for supervisory control

 

Limit Control
High Limit, Low Limit and High/Low Limit programmable

 

Digital Filter
Function First order
Time Constant 0, 0.2, 0.5, 1, 2, 5, 10, 20, 30, 60 seconds programmable

 

Environmental & Physical
Operating Temperature -10°C ~ 50°C
Storage Temperature -40°C ~ 60°C
Humidity 0 to 90 % RH ( non-condensing )
Insulation Resistance 0 Mohms min. ( at 500 VDC )
Dielectric Strength 2000 VAC, 50/60 Hz for 1 minute
Vibration Resistance 10 – 55 Hz, 10 m/s² for 2 hours
Shock Resistance 200 m/s2( 20 g )
Moldings Flame retardant polycarbonate
Dimensions C21 —50mm(W) X 26.5mm(H) X 110.5mm(D), 98.0 mm depth behind panel
C91 —48mm(W) X 48mm(H) X 94mm(D), 86 mm depth behind panel
Weight C21 — 120 grams
C91 — 140 grams

 

Approval Standards
Safety FM Class 3545 (Oct. 1998), UL873 ( 11’th edition, 1994 ) , CSA C22.2 No. 24-93 , EN61010-1 (IEC1010-1)
Protective Class IP30 front panel, indoor use,
IP20 housing and terminals ( with protective cover)
EMC EN61326

Ordering Information

L91-(1)-(2)-(3)-(4)
Type Code Specification
(1) Power Input 4 90 – 264 VAC, 47-63 HZ
5 11 – 26 VAC or VDC, SELV, Limited Energy
(2) Signal Input 1 Standard Input *
2 Voltage 0-1 V
3 Voltage 0-10 V
4 Current 0-20 mA
9 Special Order
(3) Output 1 0 None
1 Relay rated 2A / 240VAC
2 Pulsed voltage to drive SSR, 5V / 30mA
6 Triac output 1A / 240VAC,SSR
c Pulsed voltage to drive SSR, 14V/40mA
9 Special order
(4) Output 2 0 None
1 Form A relay 2A / 240VAC
2 Pulsed voltage to drive SSR, 5V / 30mA
6 Triac output, 1A / 240VAC, SSR
7 Isolated 20V/25mA DC Output Power Supply
8 Isolated 12V/40mA DC Output Power Supply
9 Isolated 5V/80mA DC Output Power Supply
A RS-485
B Event input
C Pulsed voltage to drive SSR, 14V/40mA
D Retransmit 4-20mA / 0-20mA
E Retransmit 1-5V / 0-5V
F Retransmit 0-10V
H Special orde
* Covers Inputs for Thermocouple J,K,T,E,B,R,S,N,L,C,P
RTD: PT100 DIN,PT100 JIS & mV 0-60mV

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