Laurel Electronics LT: 4-20 mA & Serial Data Output Transmitter for Pt100, Cu10 and Ni120 RTD Input - Manual

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1
LAUREL
ELECTRONICS, INC.
4-20 mA & Serial Data Output Transmitter
for Pt100, Cu10 and Ni120 RTD Input
Features
• Factory calibrated for 100Ω platinum, 10Ω copper and 120Ω nickel RTDs
• 2, 3 or 4-wire RTD connection with lead resistance compensation
• Highly accurate and repeatable
• User selectable input span from entire RTD range down to 15.0°
• Upscale or downscale open sensor indication
• DIN rail mount housing only 22.5 mm wide, detachable screw-clamp connectors
• 4-20 mA or 0-10V transmitter output, jumper selectable, isolated
• Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span
• RS232 or RS485 serial data output, half or full duplex, isolated
• Modbus RTU, Modbus ASCII or Laurel ASCII protocol
• 5V, 10V or 24V dc transducer excitation output, isolated
• Dual solid state relays for alarm or control, isolated
• Universal AC power, 85-264 Vac, or low voltage power, 10-48 Vdc or 12-32 Vac
Description
The Laureate RTD temperature transmitter provides a linear-
ized, highly accurate, stable and repeatable transmitter output for
100 ohm platinum, 10 ohm copper and 120 ohm nickel RTDs.
Pt 100 platinum RTDs can have a DIN alpha of 0.00385 or ANSI
alpha of 0.00392. The RTD type and temperature range, speci-
fied 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.
RTD connections can be via 2, 3 or 4wires. With 3- and 4-wire
connections, the transmitter automatically compensates for lead
resistance of the sensor.
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.
Open sensor indication is standard and may be set up to indi-
cate either upscale or downscale. RTD excitation is provided by
the transmitter.
Standard features of Laureate transmitters include:
• 4-20 mA, 0-20 mA or 0-10V analog transmitter output,
isolated, jumper-selectable and user scalable. All selections
provide 16-bit (0.0015%) resolution of output span and 0.02%
output accuracy of a reading from -99,999 to +99,999 counts
that is also transmitted digitally. Output isolation from signal
and power grounds eliminates potential ground loop problems.
The supply can drive 20 mA into a 500 ohm (or lower) load for
10V compliance, or 10V into a 5K ohm (or higher) load for 2
mA compliance.
• Serial communications output, isolated. User selectable
RS232 or RS485, half or full duplex. Three protocols are user
selectable: Modbus RTU, Modbus ASCII, or Laurel ASCII.
Modbus operation is fully compliant with Modbus Over Serial
Line Specification V1.0 (2002). The Laurel ASCII protocol
allows up to 31 Laureate devices to be addressed on the
same RS485 data line. It is simpler than the Modbus protocol
and is recommended when all devices are Laureates.
• Dual solid state relays, isolated. Available for local alarm or
control. Rated 120 mA at 130 Vac or 170 Vdc.
• Universal 85-264 Vac power. Low-voltage 10-48 Vdc or
12-32 Vac power is optional.
Easy Transmitter programming is via Laurel's Instrument
Setup Software, which runs on a PC under MS Windows. This
software can be downloaded from our website at no charge. The
required transmitter-to-PC interface cable is available from Laurel
(P/N CBL04).