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Thermocouple & RTD Temperature
Modbus or Laurel ASCII Protocol Serial I/O Transmitter
Exceptional linearity & accuracy at high update rates.
DIN Rail mounted, digitally
programmable.
Features
-
Selectable Modbus or Laurel ASCII
protocol.
- Modbus
RTU or ASCII modes, 2-wire connection,
up to 247 digital addresses.
- Also compliant with Laurel ASCII protocol (selectable).
- Input for 100 ohm platinum RTDs
with DIN and ANSI curves.
- 2, 3 or 4-wire RTD connection
with lead resistance compensation.
- Upscale or downscale open sensor
indication.
- User selectable spans from entire
TC or RTD range down to 15.0°
- Output update rate to 60/sec.
- Peak value
capture.
- DIN rail mount package only 22.5 mm thick.
- Detachable screw terminal connectors.
- Easy setup using PC-based
Instrument Setup Software.
- Optional isolated
scalable analog output (4-20 mA or 0-10V).
- Optional dual solid state relays for alarm or control.
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Description
Signal
Conditioning for Thermocouples & RTDs
Signal Types & Ranges. Laureate™
TM Series serial output transmitters with the temperature signal conditioner board provide
a linearized, highly accurate, stable
and repeatable transmitter output for multiple thermocouple types and 100 Ohm platinum RTDs. The meter accepts the outputs of types J, K, T, E, N, R and S thermocouples, plus
100 ohm platinum RTD’s with DIN alpha of 0.00385 and ANSI alpha of 0.003925.
The thermocouple or RTD type, unit of measure (°C or °F), resolution (1° or 0.1°),
and range are user selectable.
Cold junction compensation automatically
corrects for temperature variations at the thermocouple reference junction at the
transmitters.
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. For 3- and 4-wire connections, the transmitter automatically compensates for
lead resistance of the sensor.
 All ranges for all temperature sensor types
are digitally calibrated at the factory. This eliminates the need for field calibration or
drift caused by potentiometers found in non-microcomputer based devices.
All Laureate analog input meters
and transmitters allow exceptionally fast
read rates. Concurrent Slope (Pat 5,262,780) is a method of analog-to-digital conversion
that allows up to 60 conversions per second while integrating the input over a full power
cycle. Fast read rates provide true readings and fast response for PID control applications.
Peak value capture is standard. Full conversion accuracy is
maintained in the Modbus output.
Serial Data I/O & Programming
Laureate TM
Series transmitters send data as a
serial digital signal. RS485 or RS232
signal levels are jumper selectable and
can each be associated with either the
Modbus protocol or Laurel’s simpler
Laurel ASCII protocol.
- Modbus protocol operation is
fully compliant with the Modbus Over
Serial Line Specification V1.0
(2002) for 2-wire, half-duplex
connection. This includes RTU or
ASCII modes, addressing of up to 32
devices per RS485 line without a
repeater, and up to 247 digital
addresses. Modbus operation allows
devices by different manufacturers
to be connected in parallel and be
addressed using the same protocol.
- Laurel’s 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. It also
allows use of Laurel’s datalogging
software.
Transmitter programming is via the
unit's three-terminal serial port using
Laurel's PC-based
Instrument
Setup Software. This software can be
downloaded from this website at no
charge. The required transmitter-to-PC
interface cable is available from Laurel
(P/N CBL03). Laurel's serial output
transmitters and meters can also be part
of PC-based data logging systems using
Laurel's
Datalogging Software, which operates
under the Laurel ASCII Protocol. A
single software command switches between
the Modbus and Laurel ASCII Protocols.
Transmitter Options
Options
include dual solid state relays for
local alarm or control and an isolated
4-20 mA or 10V (selectable) analog
output, effectively providing a
linearized analog transmitter output
that tracks the reading that would be
transmitted digitally. The analog output
provides 12-bit (4096 step) resolution
of the output span and is ultra-linear
to within one bit. Its accuracy is
±0.05% of span for all signal types,
except for AC rms, where accuracy is
±0.1%. Output isolation from signal and
power grounds is provided by a separate
on-board power supply, which can drive
20 mA into a 500 ohm load for 10V
compliance. Output isolation eliminates
problems caused by ground loops.
DIN Rail Mounting
Laureate
transmitters are housed in a 35 mm DIN
rail case that is only 22.5 mm (0.89")
thick. Signal connections are via
detachable screw clamp plug connectors.
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Specifications
Laureate Serial I/O Transmitters,
Thermocouple or RTD Input
Thermocouple Input
| TC Type |
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 |
| T |
0°C to
+400°C
-257°C to 0°C
+32°F to 752°F
-430°F to +32°F |
0.03°C
0.2°C
0.05°F
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 |
Applicable
to all thermocouple types |
Calibration
Input resistance
Input current
Max lead resistance
Span tempco
Reference junction tempco
Span tempco
Overvoltage protection
NMR at 50/60 Hz
CMR, DC-60 Hz
CMV, DC-60 Hz
Open sensor indication |
NIST
Monograph 125 (IPTS-68)
1 Gohm
100 pA
1 Gohm max for rated accuracy
±0.003% of reading/ºC
±0.02 deg/deg
±0.003% of reading/ºC
125 Vac
80 dB plus selectable digital filter from 80 ms
to 9.6 s time constant
120 dB with 500 W imbalance
250 Vac from power and earth grounds
0 mA or > 20mA output, selectable |
Pt 100 RTD Input
| RTD Alpha |
Range |
Conformity
Error |
DIN
.00385 |
-202°C to
+850°C
-331°F to +1562°F |
0.03°C
0.05°F |
ANSI
.003925 |
-202°C to
+631°C
-331°F to +1168°F |
0.04°C
0.07°F |
Applicable
to all RTD types |
Calibration, DIN
Calibration ANSI
Configuration
Excitation current
Span tempco
Zero tempco
Sensor lead resistance
tempco per conductor
Over-voltage protection
Open sensor indication |
IEC 751 (IPTS-68)
NIST Monograph 126
2, 3 or 4-wire connection
0.2 mA
±0.003% of reading/ºC
±0.03 deg/deg
2-wire, 10 mdeg/W/deg up to 10 W
3 & 4-wire, 10 mdeg/W/deg up to 100 W
125 Vac
0 mA or > 20mA output, selectable |
Thermocouple & RTD
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Serial I/O (standard) |
Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance |
RS485 (default) or RS232 (jumper selectable)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test.
Modbus RTU, Modbus ASCII, Laurel ASCII (selectable)
32 max without a repeater.
247 max
RTU or ASCII, 2-wire.
Modbus over Serial Line Specification V1.0 (2002). |
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Dual Relay Output (optional) |
Relay Type
Load rating |
Two solid state relays, SPST, normally open,
Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance. |
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Analog Output (optional) |
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation |
0-20 mA, 4-20 mA or 0-10 Vdc (selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load )
12 bits (4,096 steps)
±0.05% of output span
250V rms working, 2.3 kV rms per 1 minute test |
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Power Input |
Standard power
Low power option
Frequency
Power Isolation |
95-240V AC ±10% or 90-300V DC
12-30V AC or 10-48V DC
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test. |
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Mechanical |
Case Dimensions
Case Mounting
Electrical Connections |
120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Detachable screw terminal connectors |
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Environmental |
Operating Temperature
Storage Temperature
Relative Humidity |
0°C to
70°C
-40°C to 85°C
95% at 40°C, non-condensing |
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Specifications
Laureate Serial Output Transmitter,
Thermocouple or RTD Input
(shown with optional analog output
and dual relay
output)
Thermocouple Transmitter Connection
RTD Connections with
Excitation & Lead Compensation
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Laureate temperature
transmitters
allow 2-, 3- or 4-wire RTD hookup to the J5 connector. The transmitter applies an excitation
current of 0.2 mA, which it monitors to make ratiometric corrections for excitation supply
variations.
In 2-wire hookup, the
transmitter
senses the voltage drop across the 100 ohm RTD and both lead wires. The effect of the lead
wires can be measured and subtracted by shorting out the RTD during
transmitter setup.
In 3- and 4-wire hookup, the
transmitter senses the voltage drop across the 100 ohm RTD and both lead wires as well as the
voltage drop across the RTD and one lead wire. This allows the transmitter to determine the effect of
one lead wire and mathematically subtract the effect of both lead wires. |
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Operation as a
Fast ON/OFF Controller
or Supervisory Monitor
 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. With Modbus, relay operation
can be non-latching or latching, with reset provided by digital commands.
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Ordering
Guide
Modbus or Laurel ASCII Protocol Serial I/O Transmitter,
Thermocouple or RTD Input
Create a model
number in this format: TM202JF. This example calls out a
Modbus output transmitter, standard main board, 95-240
Vac power, isolated dual solid state relays, and a
temperature signal conditioner set for thermocouple Type
J, -347°F to 1400°F in = 4-20 mA out. Includes plug-in screw terminal
connectors.
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Transmitter
Type |
TM Laureate Transmitter, Modbus or
Laurel ASCII Protocol. |
$210 |
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Main
Board |
2 Standard Main Board. |
NC |
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Power |
0 Isolated 95-240 Vac & 90-300 Vdc
1 Isolated 12-30 Vac & 10-48 Vdc. |
NC
$30 |
Setpoint
Output |
0 None.
2 Isolated Dual Solid State Relays. |
NC
$30 |
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Analog
Output |
0 None.
1 4-20 mA, 0-10V. |
NC
$25 |
Signal
Input |
Thermocouples
JC Thermocouple Type J, -210°C to 760°C.
JF Thermocouple Type J, -347°F to 1400°F.
KC Thermocouple Type K, -347°C to 1372°C.
KF Thermocouple Type K, -408°F to 2501°F.
TC Thermocouple Type T, -257°C to 400°C.
TF Thermocouple Type T, -430°F to 752°F.
EC Thermocouple Type E, -240°C to 1000°C.
EF Thermocouple Type E, -400°F to 1830°F.
NC Thermocouple Type N, -240°C to 1000°C.
NF Thermocouple Type N, -410°F to 2370°F.
SC Thermocouple Type S, -46°C to 1768°C.
SF Thermocouple Type S, -51°F to 3214°F.
RC Thermocouple Type R, -45°C to 1768°C.
RF Thermocouple Type R, -49°F to 3213°F. |
NC |
RTDs (100
Ohm Platinum)
P385C RTD Alpha .00385, -202°C to 850°C.
P385F RTD Alpha .00385, -331°F to 1562°F.
P392C RTD Alpha .003925, -202°C to 631°C.
P392F RTD Alpha .003925, -331°F to 1168°F. |
NC |
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Note: The
same temperature signal conditioner board can be user
configured for all thermocouple and RTD types listed.
Temperatures for each type are spanned by a single
range. |
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Accessories |
CBL03 RS-232 cable, TM to computer.
CBL02 USB to RS-232 cable adapter. |
$19
$39 |
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Order from
distributors for shipment to USA or Canada. |
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Order online for
international shipment. |
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