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Information
SPECIFICATIONS
Information
The limit control L91 is an over temperature or a high limit safety device with a latching output that could remove the power while the process is in abnormal condition, for example the process higher than high limit set point or lower than the low limit set point.
SPECIFICATIONS
| Power |
|---|
| 90 – 250 VAC, 47 – 63 Hz, 10VA, 5W maximum |
| 11 – 26 VAC / VDC, SELV, Limited Energy, 10VA, 5W maximum |
| 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 |
| 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 |
| Burn-out Current | 200nA |
| Common Mode Rejection Ratio ( CMRR ) | 120dB |
| 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. |
| Characteristics | |||
|---|---|---|---|
| Type | Range | Accuracy@ 25 °C | Input Impedance |
| J | -120 ~ 1000 °C (-184 ~ 1832 °F) | ±2 °C | 2.2MΩ |
| K | -200 ~ 1370 °C (-328 ~ 2498°F) | ±2 °C | 2.2MΩ |
| T | -250 ~ 400°C (-418 ~ 752°F) | ±2 °C | 2.2MΩ |
| E | -100 ~ 900 °C (-148 ~ 1652 °F) | ±2 °C | 2.2MΩ |
| B | 0 ~ 1820 °C (32 ~ 3272 °F) | ±2 °C (200°C – 1820°C) | 2.2MΩ |
| R | 0 ~ 1767.8 °C (32 ~ 3214 °F) | ±2 °C | 2.2MΩ |
| S | 0 ~ 1767.8 °C (32 ~ 3214 °F) | ±2 °C | 2.2MΩ |
| N | -250 ~ 1300 °C (-418 ~ 2372 °F) | ±2 °C | 2.2MΩ |
| L | -200 ~ 900 °C (-328 ~ 1652 °F) | ±2 °C | 2.2MΩ |
| PT100 (DIN) | -210 ~ 700 °C (-346 ~ 1292 °F) | ±0.4°C | 1.3KΩ |
| PT100 (JIS) | -200 ~ 600 °C (-328 ~ 1112 °F) | ±0.4°C | 1.3KΩ |
| mV | -8 ~ 70mV | ±0.05% | 2.2MΩ |
| mA | -3 ~ 27mA | ±0.05% | 70.5Ω |
| V | -1.3 ~ 11.5V | ±0.05% | 510KΩ |
| 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 | 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 | 48mm(W) X 48mm(H) X 94mm(D), 86 mm depth behind panel |
| Weight | 150 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 |
