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Standard Features
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DescriptionThe Micron Modbus & serial output temperature transmitter provides a linearized, highly accurate, stable and repeatable transmitter output for multiple thermocouple types and 100 Ohm platinum RTDs. The transmitter accepts the outputs of types J, K, T, E, N, R or S thermocouples, plus 100 ohm platinum RTD’s with DIN alpha of 0.00385 or ANSI alpha of 0.00392. The thermocouple or RTD type and temperature range, specified in °C or °F, are user-selectable.
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. LTM Series serial output transmitters send data via an isolated serial port, which is user configurable for RS232 or RS485 and full or half duplex operation. Three protocols are user selectable: Modbus RTU, Modbus ASCII, or Micron ASCII. Modbus operation is fully compliant with Modbus Over Serial Line Specification V1.0 (2002). The Micron ASCII protocol allows up to 31 Micron devices to be addressed on the same RS485 data line. It is simpler than the Modbus protocol and is recommended when all devices are Microns. It also allows use of Micron Datalogging Software. Standard features of Micron transmitters include:
Easy Transmitter programming is via Micron'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 Micron (P/N CBL04). |
Thermocouple Input
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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 |
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Calibration Input resistance Input current Max lead resistance Overall accuracy Span tempco Reference junction tempco Span tempco Over-voltage 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 kohm max for rated accuracy ±0.01 of full scale ±2 counts ±0.003% of reading/ºC ±0.02 deg/deg ±0.003% of reading/ºC 125 Vac 80 dB plus selectable 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 |
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 Overall accuracy 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 ±0.01 of full scale ±2 counts ±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
Serial Data Output (standard) |
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Signal Types Data Rates Output Isolation Serial Protocols Modbus Modes Modbus Compliance Digital Addressing |
RS232 or RS485 (half or full duplex) 300, 600, 1200, 2400, 4800, 9600, 19200 baud 250V rms working, 2.3 kV rms per 1 min test Modbus RTU, Modbus ASCII, Micron ASCII RTU or ASCII Modbus over Serial Line Specification V1.0 (2002) 247 Modbus addresses. Up to 32 devices on an RS485 line w/o a repeater. |
Analog Output (standard) |
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Output Levels Compliance, 4-20 mA Compliance, 0-10V Output Resolution Output Accuracy Output Isolation |
4-20 mA, 0-20 mA, 0-10 Vdc (jumper selectable) 10V ( 0-500 ohm load ) 2 mA ( 5 kOhm load or higher) 16 bits (65,536 steps) 0.02% of output span plus conversion accuracy 250V rms working, 2.3 kV rms per 1 minute test |
Dual Relay Output (standard) |
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Relay Type Load rating |
Two solid state relays, SPST, normally open, Form A 130 mA at 140 Vac or 180 Vdc |
Power Input |
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Standard power Low power option Power frequency Power isolation Power consumption |
85-264 Vac or 90-300 Vdc (DC operation not UL approved) 10-48 Vdc or 12-30 Vac DC or 47-63 Hz 250V rms working, 2.3 kV rms per 1 min test 2W typical |
Mechanical |
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Case Dimensions Case Mounting Electrical Connections |
120 x 101 x 22.5 mm 35 mm rail per DIN EN 50022 Detachable screw-clamp plugs |
Environmental |
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Operating Temperature Storage Temperature Relative Humidity Protection Cooling Required |
0°C to 55°C -40°C to 85°C 95% at 40°C, non-condensing NEMA-4X (IP-65) when panel mounted Mount transmitters so that ventilation holes are at top and bottom. Leave 6 mm (1/4") between transmitters, or blow air by means of a fan. |
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Micron 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
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All ranges for all temperature sensor types are digitally calibrated at 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. Cold junction compensation automatically corrects for temperature variations at the thermocouple reference junction at the transmitter. 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.
With the optional dual solid state relay output option, which has a typical response time of only 17 ms, Micron 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.