Description
Brainchild Safety L41 Limit Controller is over-temperature protection or a high limit safety device with a latching output, that removes power in an abnormal condition during the process that is higher than the high limit set point or lower than the low limit set point.
The unit is powered by an 11-26 or 90-250 VDC/VAC supply, incorporating a 3 amp. form C relay for limit control, an universal input that is fully programmable for PT100, thermocouple types J,
K, T, E, B, R, S, N, L, and 0~60mV, an option port available for one of the following functions: alarm output, RS-485 communication interface, DC power supply output, limit annunciator output, and event input. Alternative output options include SSR drive and triac. The input signal is digitized by using an 18-bit A-to-D converter. Its fast sampling rate (5 times/second) allows the L91 to control fast processes such as pressure and flow.
Digital communication RS-485 is available as an additional option. This option allows L41 to be integrated with a supervisory control system. An alarm output is another option. A variety of alarm functions and alarm modes can be programmed for a specific application. The DC power supply output option is used for an external sensor or transmitter. The event input option can be programmed for remote reset or remote lock signal input. The limit annunciator option can be used to control an alarm buzzer.
Thress kinds of methods can be used to program L41.
- Use keys on the front panel to program the unit manually,
- Use a PC and setup software to program the unit via the RS-485 port and
- Use a pc and configuration software to program the unit via the programming port.
High accuracy, maximum flexibility, fast response and user-friendly are the main feature of L41
Brainchild Safety L41 Limit Controller Specification
Power
90 – 250 VAC, 47 – 63 Hz, 10VA, 5W maximum
11 – 26 VAC / VDC, SELV, Limited Energy, 10VA, 5W maximum
Signal Input
| Signal Input | 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 for all inputs except mA |
| input ±3.0 uV/ °C for mA input | |
| 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 |
| Normal Mode Rejection Ratio ( NMRR ) | 55dB |
| Sensor Break Detection | Sensor open for TC, RTD, and mV inputs, |
| 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. |
Accuracy
| Type | Range | ?Accuracy@ 25 °C | Input Impedance |
| J | -120 ~ 1000 °C (-184 ~ 1832 °F) | ±2 °C | 2.2M? |
| K | -200 ~ 1370 °C (-328 ~ 2498°F) | ±2 °C | 2.2M? |
| T | -250 ~ 400°C (-418 ~ 752°F) | ±2 °C | 2.2M? |
| E | -100 ~ 900 °C (-148 ~ 1652 °F) | ±2 °C | 2.2M? |
| B | 0 ~ 1800 °C (32 ~ 3272 °F) | ±2 °C (200°C – 1800°C) | 2.2M? |
| R | 0 ~ 1767.8 °C (32 ~ 3214 °F) | ±2 °C | 2.2M? |
| S | 0 ~ 1767.8 °C (32 ~ 3214 °F) | ±2 °C | 2.2M? |
| N | -250 ~ 1300 °C (-418 ~ 2372 °F) | ±2 °C | 2.2M? |
| L | -200 ~ 900 °C (-328 ~ 1652 °F) | ±2 °C | 2.2M? |
| PT100 (DIN) | -210 ~ 700 °C (-346 ~ 1292 °F) | ±0.4°C | 1.3K? |
| PT100 (JIS) | -200 ~ 600 °C (-328 ~ 1112 °F) | ±0.4°C | 1.3K? |
| mV | -8 ~ 70mV | ±0.05% | 2.2M? |
| mA | -3 ~ 27mA | ±0.05% | 70.5? |
| V | -1.3 ~ 11.5V | ±0.05% | 650K? |
Input 2
| Resolution | 18 bits |
| Sampling Rate | 1.66 times/second |
| Maximum Rating | -2 VDC minimum, 12 VDC maximum |
| Temperature Effect | ±1.5uV/ °C for all inputs except mA |
| input ±3.0uV/ °C for mA input | |
| Common Mode Rejection Ratio ( CMRR ) | 120dB |
| Normal Mode Rejection Ratio ( NMRR ) | 55dB |
| Sensor Break Detection | Below 1 mA for 4-20 mA input, |
| below 0.25V for 1 – 5V input, | |
| unavailable for other inputs. | |
| Sensor Break Responding Time | 0.5 second |
Output
| Output 1 / Output 2 | |
| Relay Rating | 2A/240 VAC, life cycles 200,000 for resistive load |
| Pulsed Voltage | Source Voltage 5V, current limiting resistance 66? |
| 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 |
Alarm
| Alarm Relay | Form C, Max. rating 2A/240VAC, life cycles 200,000 for resistive load. |
| Alarm Functions | Dwell timer, Deviation High / Low Alarm, Deviation Band High / Low Alarm Process High / Low Alarm Alarm Mode: Normal, Latching, Hold, Latching / Hold. |
| Dwell Timer | 0.1 – 4553.6 minutes |
Data Communication
| Data Communication | |
| Interface | RS-232 ( 1 unit ), RS-485 ( up to 247 units ) |
| Protocol | Modbus Protocol RTU mode |
| Address | 1 – 247 |
| Baud Rate | 2.4 ~ 38.4 Kbits/sec |
| Data Bits | 7 or 8 bits |
| Parity Bit | None, Even or Odd |
| Stop Bit | 1 or 2 bits |
| Communication Buffer | 160 bytes |
Analog Retransmission
| Output Signal | 4-20 mA, 0-20 mA, 0-1V, 0-5V, 1-5V, 0-10V |
| Resolution | 15 bits |
| Accuracy | ±0.05 % of span ±0.0025 %/ °C |
| Load Resistance | 0 – 500 ohms ( for current output ),10 K ohm minimum ( for voltage output ) |
| Output Regulation | 0.01 % for full load change |
Interface
| User Interface | Dual 4-digit LED Displays |
| 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 ) |
| Altitude | 2000m maximum |
| Pollution | Degree 2 |
| Insulation Resistance | 20 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 | 96mm(W) X 96mm(H) X 65mm(D), 53 mm depth behind panel |
| Mounting | panel mount, cutout 92 X 92 ( mm ) |
| Weight | 250 grams |
Event Input
| Logic Low | Logic -10V minimum, 0.8V maximum. |
| Logic High | 2V minimum, 10V maximum. |
| Functions | Remote reset, remote lockout. |
Approval Standards
| Safety | UL 61010C-1 , CSA C22.2 No. 24-93 , EN61010-1 (IEC1010-1) |
| Protective Class | IP65 front panel with an additional option, IP50 front panel without additional option, all indoor use, IP 20 housing and terminals with protective cover. |
| EMC | EN61326 |
Read Another Article :
- Brainchild BTC-4300 High-end Process and Temperature
- KEP meter ES-762 Utility Metering Flow Computer
- KEPmeter ES-749 Utility Metering Flow Computer
- KEPmeter D Series Inductive Proximity Sensors
- KEP meter Flow Computers
- Brainchild BTC-4300 High-end Process and Temperature Controllers
- Brainchild BTC Series Established Process and Temperature Controllers
- Brainchild Safety L41 Limit Controller
