LT-RM, Laurel 4-20 mA & Serial Data Transmitter for AC RMS Voltage or Current
Measures true RMS AC voltage or current with 0.1% accuracy in one power line cycle. DIN rail mounted, digitally programmable, and includes relays for alarm or control.
Features:
- 4-20 mA, 0-20 mA, 0-10V, or -10V to +10V transmitter output, 16 bits, isolated.
- RS232 or RS485 serial data output, Modbus or Laurel ASCII protocol, isolated.
- Dual 120 mA solid-state relays for alarm or control, isolated.
- True AC RMS measurement in one 50/60 Hz AC line cycle.
- Voltage ranges: ±0.2V, ±2V, ±20V, ±200V, ±300V, ±600V.
- Current ranges: ±2 mA, ±20 mA, ±200 mA, ±5A.
- Input ranges are user-selectable and factory-calibrated.
- AC or DC coupling for signals from DC to 5 kHz.
- Measures from 0% to 100% of full scale.
- 0.03% accuracy of full scale with a crest factor up to 3.0.
- Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power options.
- Extended temperature range option: -40°C to 70°C (-X).
Manufacturer: Laurel Electronics Inc.
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Datasheet
Description
Specifications
Applications
Models & Accessories
Downloads
Similar Products
LT-RM - Description
The LT-RM transmitter is specifically designed to provide true RMS (Root Mean Square) measurements of AC voltage or current signals, ensuring precise and reliable results for industrial applications. With six voltage input ranges and four current input ranges, all factory calibrated and jumper-selectable, the device supports a wide variety of applications. The built-in 5A range uses an internal 0.01 ohm shunt resistor, eliminating the need for external transformers.
True RMS measurements calculate the equivalent heating value of an AC waveform, even for complex or distorted signals. This makes it ideal for applications with non-sinusoidal waveforms or fluctuating loads. The device processes signals from DC to 5 kHz, ensuring accuracy for a variety of electrical systems.
High common mode rejection allows accurate measurements even when using current shunts located on the high side of the line. Additionally, digital signal filtering can be configured to stabilize readings in noisy environments.
LT-RM - Specifications
| Interface | RS-232 |
| RS-485 | |
| Input Type | 0 - 5 A AC |
| AC voltage | |
| Output Type | 0 - 10 V DC |
| ±10 V DC | |
| 0 - 20 mA | |
| 4 - 20 mA | |
| Isolation | Yes |
| Min Temperature | 0°C |
| Max Temperature | 55°C |
LT-RM - Applications
The LT-RM transmitter is ideal for industrial environments requiring precise monitoring of AC voltage and current. It can be used to:
- Monitor power consumption in machines and equipment.
- Detect anomalies or faults in power lines.
- Control alarms or triggers based on voltage or current thresholds.
LT-RM - Models & Accessories
Models
| LT20RMV1 | Standard analog input. Isolated 85-264 Vac or 90-300 Vdc |
| LT21RMV1 | Standard analog input. Isolated 12-32 Vac or 10-48 Vdc |
| LT40RMV1 | Extended analog input. Isolated 85-264 Vac or 90-300 Vdc |
| LT40RMV1 | Extended analog input. Isolated 12-32 Vac or 10-48 Vdc |
| LT-RM |
LT-RM - Downloads
transmitter-ac datasheet Datasheet |
LT-series manual-ATI Manual |
LT-RM - Similar Products
- 4-20 mA, 0-20 mA, 0-10V, or -10V to +10V transmitter output, 16 bits, isolated.
- RS232 or RS485 serial data output, Modbus or Laurel ASCII protocol, isolated.
- Dual 120 mA solid-state relays for alarm or control, isolated.
- Measures time from 0.2 µs to 999,999 hours.
- Tracks single event or accumulated time for multiple events.
- Supports inputs from NPN/PNP switches, logic, and magnetic pickups.
| Interface | RS-232, RS-485 |
| Input Type | Frequency |
| Output Type | 0 - 10 V DC, ±10 V DC, 0 - 20 mA, 4 - 20 mA |
| Excitation | 5 V DC, 10 V DC, 24 V DC |
| Isolation | Yes |
| Min Temperature | 0°C |
- 4-20 mA, 0-20 mA, 0-10V, or -10V to +10V transmitter output, 16 bits, isolated.
- RS232 or RS485 serial data output, Modbus or Laurel ASCII protocol, isolated.
- Dual 120 mA solid-state relays for alarm or control, isolated.
- Measures duty cycle with selectable resolution (1%, 0.1%, or 0.01%).
- Supports frequencies from 0.005 Hz to 10 kHz.
- Inputs from NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up to 250 Vac.
- Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span 5V, 10V or 24V dc transducer excitation output, isolated
| Interface | RS-232, RS-485 |
| Input Type | AC voltage |
| Output Type | 0 - 10 V DC, ±10 V DC, 0 - 20 mA, 4 - 20 mA |
| Isolation | Yes |
| Min Temperature | 0°C |
| Max Temperature | 55°C |
- 4-20 mA, 0-20 mA, 0-10V, or -10V to +10V transmitter output, 16 bits, isolated.
- RS232 or RS485 serial data output, Modbus or Laurel ASCII protocol, isolated.
- Dual 120 mA solid-state relays for alarm or control, isolated.
- Arithmetic functions: A+B, A-B, AxB, A/B, A/B-1.
- Input frequencies: 0.005 Hz to 1 MHz.
- Inputs from NPN or PNP proximity switches, contact closures, digital logic,
- magnetic pickups down to 12 mV, or AC inputs up to 250 Vac
- Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span
| Interface | RS-232, RS-485 |
| Input Type | Frequency, AC voltage |
| Output Type | 0 - 10 V DC, ±10 V DC, 0 - 20 mA, 4 - 20 mA |
| Excitation | 5 V DC, 10 V DC, 24 V DC |
| Isolation | Yes |
| Min Temperature | 0°C |
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Datasheet
LT-QD - Laurel 4-20 mA & Serial Data Output Transmitters for Position or Rate from Quadrature Encoders - 4-20 mA, 0-20 mA, 0-10V or -10V to +10V transmitter output, 16 bits, isolated
- RS232 or RS485 serial data output, Modbus or Laurel ASCII protocol, isolated
- Dual 120 mA solid state relays for alarm or control, isolated
- Accepts low-level differential or single-ended 5V logic level signals from shaft encoders, linear encoders, incremental encoders or optical encoders
- Programmable for position, angle or rate
- Quadrature count x1, x2 or x4 with combined pulse rate to 250 kHz
- Zero channel input
- Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span
| Interface | RS-232, RS-485 |
| Input Type | Frequency, Counter |
| Output Type | 0 - 10 V DC, ±10 V DC, 0 - 20 mA, 4 - 20 mA |
| Min Temperature | 0°C |
| Max Temperature | 55°C |
- 4-20 mA, 0-20 mA, 0-10V, or -10V to +10V transmitter output, 16 bits, isolated.
- RS232 or RS485 serial data output, Modbus or Laurel ASCII protocol, isolated.
- Dual 120 mA solid-state relays for alarm or control, isolated.
- Factory calibrated for 100Ω platinum (Pt100), 10Ω copper (Cu10), and 120Ω nickel (Ni120) RTDs.
- Supports 2, 3, or 4-wire RTD connections with lead resistance compensation.
- User-selectable input span from the full RTD range to as narrow as 15.0°.
- Analog output resolution: 0.0015% of span; accuracy: ±0.02% of span.
| Interface | RS-232, RS-485 |
| Input Type | RTD |
| Output Type | 0 - 10 V DC, ±10 V DC, 0 - 20 mA, 4 - 20 mA |
| Min Temperature | -40°C, 0°C |
| Max Temperature | 55°C, 70°C |