The Laureate RTD temperature transmitter provides a linearized, highly accurate, stable and repeatable transmitter output for 100 ohm platinum, 10 ohm copper and 120 ohm nickel RTDs. Pt100 platinum RTDs can have a DIN alpha of 0.00385 or ANSI alpha of 0.00392. The RTD 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 RTD type or as narrow as 150 counts (such as 15.0°), limited only by considerations of electrical noise and digital filtering time constants.
Digital calibration of all RTD ranges is performed the factory, with calibration data stored in EEPROM on the signal conditioner board. This allows signal conditioner boards and ranges to be changed in the field with no need for recalibration. Typical accuracy for a Pt100 is better than ±0.04°C (±0.07°F) ±0.01% of reading. Open sensor indication is standard and may be set up to indicate either upscale or downscale. RTD excitation is provided by the transmitter. RTD connections can be of the 2-, 3- or 4-wire type. With 3- and 4-wire connections, the transmitter automatically compensates for changes in lead resistance to the sensor. Instrument Setup Software allows user calibration for RTDs whose resistance is different than nominal at 0°C.
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 LT transmitters include:
Easy Transmitter programming is via Laurel's Instrument Setup Software, which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from Laurel (P/N CBL04).
RTD Metal | Alpha | R at 0°C | R at top of range |
Excitation Current |
Range | Max Error |
---|---|---|---|---|---|---|
Platinum Pt100 |
0.003850 (DIN) | 100Ω | 390.48Ω at 850°C |
196 µA | -202°C to +850°C -331°F to +1562°F |
±0.03°C ±0.01% of rdg ±0.05°F ±0.01% of rdg |
Platinum Pt100 |
0.003902 (ANSI) | 100Ω | 394.36Ω at 850°C |
196 µA | -202°C to +850°C -331°F to +1168°F |
±0.04°C ±0.01% of rdg ±0.07°F ±0.01% of rdg |
Nickel Ni120 |
0.00672 | 120Ω | 380.31Ω at 260°C |
196 µA | -80°C to +260°C -112°F to +500°F |
±0.05°C ±0.01% of rdg ±0.09°F ±0.01% of rdg |
Copper Cu10 |
0.00427 | 9.035Ω | 19.116Ω at 260°C |
5.0 mA | -100°C to +260°C -148°F to +500°F |
±0.05°C ±0.01% of rdg ±0.09°F ±0.01% of rdg |
RTD Input | |
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Calibration, Pt 100 DIN | IEC 751 (IPTS-68) |
Calibration, Pt 100 ANSI | NIST Monograph 126 |
Configuration | 2, 3 or 4-wire connection |
Excitation current | 0.2 mA |
Max error at 25°C, Pt100 | ±0.04°C (±0.07°F) ±0.01% of reading |
Span tempco | ±0.003% of reading/°C |
Zero tempco | ±0.03 deg/deg |
Sensor lead resistance | 2-wire: 10 mdeg/Ω/deg up to 10Ω; |
tempco per conductor | 3 & 4-wire: 10 μdeg/Ω/deg up to 100Ω |
Over-voltage protection | 125 Vac |
Open sensor indication | 0 mA or > 20 mA output, selectable |
Provision for user calibration | Multiplier of RTD resistance plus offset in degrees |
Analog Output (standard) | |
Output Levels | 4-20 mA, 0-20 mA, 0-10 Vdc, -10 to +10Vdc (user selectable) |
Compliance, 4-20 mA | 10V (0-500Ω load) |
Compliance, 0-10V | 2 mA (5 kΩ load) |
Output Resolution | 16 bits (65,536 steps) |
Output Accuracy | ±0.02% of output span |
Output Isolation | 250V rms working, 2.3 kV rms per 1 minute test |
Step response time | 50 ms |
Serial Data Output (standard) | |
Signal Types | RS232 or RS485 (half or full duplex), jumper selectable |
Data Rates | 300, 600, 1200, 2400, 4800, 9600, 19200 baud |
Output Isolation | 250V rms working, 2.3 kV rms per 1 min test |
Serial Protocols | Modbus RTU, Modbus ASCII, Custom ASCII |
Modbus Compliance | Modbus over Serial Line Specification V1.0 (2002) |
RS232/485 Connector | Screw terminals for easy daisy chaining |
Digital Addresses | 247 for Modbus, 31 for Custom ASCII |
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 at 24V | 1.5W typical |
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 RTD Temperature Transmitter and Signal Conditioner
RTD hookup can be via 2, 3 or 4 wires to the J5 connector. The transmitter applies an excitation current of 196 µA (Pt 100 and Ni 120) or 5 mA (Cu 10).
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In 4-wire hookup, different pairs of leads are used to apply the excitation current and sense the voltage drop across the RTD, so that the IR drop across the excitation leads is not a factor. |
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In 3-wire hookup, the transmitter senses the combined voltage drop across the RTD plus two excitation leads. It also senses the voltage drop across one excitation lead, and then subtracts twice this voltage from the combined total. This technique effectively subtracts all lead resistance and compensates for ambient temperature changes if the two excitation leads are identical. |
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In 2-wire hookup, the transmitter senses the combined voltage drop across the RTD and both lead wires. The voltage drop across the lead wires can be measured by shorting out the RTD during transmitter setup, and this voltage is then automatically subtracted from the combined total. However, changing resistance of the lead wires due to ambient temperature changes will not be compensated. |
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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.