The Laureate thermocouple transmitter provides a linearized, highly accurate, stable and repeatable transmitter output for thermocouple types J, K, T, E, N, R or S. The thermocouple type and temperature range, specified in °C or °F, are user-selectable. The temperature range can be as wide as the entire span of the thermocouple type, or as narrow as 150 counts (such as 15.0°), limited only by considerations of electrical noise and digital filtering time constants.
All ranges for all thermocouple types are digitally calibrated at the factory, with calibration factors stored in EEPROM on the signal conditioner board. This allows temperatures sensors and signal conditioner boards to be changed in the field without recalibrating the meter. For cold junction compensation (CJC), an external transistor is mounted adjacent to the thermocouple input to measure ambient termperature. That transistor is calibrated as a system with the signal conditioner board.
Fast read rate at up to 50 or 60 conversions per second while integrating the signal over a full power line cycle is provided by Concurrent Slope (Pat 5,262,780) analog-to-digital conversion. High read rate is ideal for peak or valley capture and for real-time computer interface and control.
Standard features of Laureate LTE transmitters include:
Node discovery and configuration of Laureate Ethernet transmitters are easily achieved with Laurel's Windows based Instrument Setup Software. Additional features are provided by Laurel's Windows based Node Manager Software, such as the ability to send emails or test messages either periodically or in the event of an alarm. Both softwares run on a PC under MS Windows, are at no charge, and can be downloaded from this website.
TC Types | Range | Conformity Error |
---|---|---|
J | -210°C to +760°C (-347°F to +1400°F) | ±0.09°C (±0.16°F) |
K | -244°C to +1372°C (-408°F to +2501°F) | ±0.1°C (±0.17°F) |
L | 0°C to +400°C (32°F to 752°F) -257°C to 0°C (-430°F to +32°F) |
±0.03°C (±0.05°F) ±0.2°C (±0.36°F) |
E | -240°C to +1000°C (-400°F to +1830°F) | ±0.18°C (±0.32°F) |
N | -245°C to +1300°C (-410°F to +2370°F) | ±0.10°C (±0.17°F) |
R | -45°C to +1768°C (-49°F to +3214°F) | ±0.17°C (±0.31°F) |
S | -46°C to +1768°C (-51°F to +3213°F) | ±0.12°C (±0.22°F) |
Analog Input | |
---|---|
Calibration | NIST Monograph 125 (IPTS-68) |
Input Resistance | 1 GΩ |
Input Current | 100 pA |
Max Lead Resistance | 1 kΩ max for rated accuracy |
Overall Error at 25°C | ±0.01 of full scale ±2 counts |
Span Tempco | ±0.003% of reading/°C |
Ref Junction Tempco | ±0.02 deg/deg |
Overvoltage Protection | 125 Vac |
NMR at 50/60 Hz | 80 dB plus selectable filter from 80 ms to 9.6 s time constant |
CMR, DC-60 Hz | 120 dB with 500Ω imbalance |
CMV, DC-60 Hz | 250 Vac from power and earth grounds |
Open Sensor Indication | 0 mA or > 20 mA output, selectable |
Analog Output (standard) | |
Output Levels | 4-20 mA, 0-20 mA, 0-10 Vdc (jumper selectable) |
Compliance, 4-20 mA | 10V (0-500Ω load) |
Compliance, 0-10V | 2 mA (5 kΩ load or higher) |
Output Resolution | 16 bits (65,536 steps) |
Output Error | ±0.02% of output span ± overall input error |
Output Isolation | 250V rms working, 2.3 kV rms per 1 minute test |
Step Response Time | 50 ms |
Ethernet Data I/O (standard) | |
Type | 10/100 Base-T Ethernet per IEEE 802.3 |
Data Rates | 300, 600, 1200, 2400, 4800, 9600, 19200 baud |
Output Isolation | 250V rms working, 2.3 kV rms per 1 min test |
Serial Protocol | Modbus TCP |
Modbus Compliance | Modbus over Serial Line Specification V1.0 (2002) |
Digital Addresses | 247 |
Dual Relay Output (standard) | |
Relay Type | Two solid state relays, SPST, normally open, Form A |
Load Rating | 120 mA at 140 Vac or 180 Vdc |
Power Input | |
Standard Power | 85-264 Vac or 90-300 Vdc |
Low Power Option | 10-48 Vdc or 12-32 Vac |
Power Frequency | DC or 47-63 Hz |
Power Isolation | 250V rms working, 2.3 kV rms per 1 min test |
Power Consumption | 2.5W typical at 24V |
Mechanical | |
Dimensions | 129 x 104 x 22.5 mm case |
Mounting | 35 mm rail per DIN EN 50022 |
Electrical Connections | Plug-in screw-clamp connectors |
Environmental | |
Operating Temperature | 0°C to 55°C standard, -40°C to 70°C with -X option |
Storage Temperature | -40°C to 85°C |
Relative Humidity | 95% at 40°C, non-condensing |
Cooling Required | Mount transmitters with ventilation holes at top and bottom. Leave 6 mm (1/4") between transmitters, or force air with a fan. |
Laureate Ethernet & 4-20 mA Output Thermocouple Temperature Transmitter
With the optional dual solid state relay output option, which has a typical response time of only 17 ms, Laureate temperature meters and transmitters can serve as extremely fast and accurate ON/OFF controllers for closed-loop temperature control. They can also serve as supervisory process monitors and provide alarms or shutoffs when processes exceed normal limits.
Multiple setpoint operating modes are individually selectable for each relay, as explained in the dual-setpoint controller page. Relay duty cycles and chatter can be minimized with programmable hysteresis and time delays. A band deviation operating mode can be selected for each relay, where an alarm is generated whenever the reading is a selected number of counts above or below the setpoint. The relay modes have to be non-latching, since 4-20 mA temperature transmitters do not offer external reset.