D2275-02-02 SEM315 CN4978 WEB User guide
1.0 DESCRIPTION
The SEM315 is a HART Din Rail temperature transmitter that accepts commonly used temperature
sensor, slidewire transducer or millivolt signal and converts the output to the industry standard (4 to
20) mA transmission signal.
The software package M-config or a Hart Communicator with the necessary “Device Description” can
be used to program the unit.
2.0 SPECIFICATION @ 20 °C
2.1 RTD INPUT (Pt100) 2, 3 OR 4 WIRE
Sensor Range (-200 to 850) °C (18 to 390) Ω
Minimum Span 125 °C
Linearisation BS EN60751 (IEC 751) BS 1904
(DIN 43760), JISC 1604, CUSTOM [X] 3
Max Lead Resistance 50 Ωper leg (balanced for 3 wire)
Basic Measurement Accuracy 2±0.01 % FRI ±0.07 % Rdg
(FRI = Full Range Input)
RTD Excitation Current (300 to 500) µA
Thermal Drift Zero 0.008 °C / C
Span 0.01% / °C
2.2 THERMOCOUPLE INPUT
Thermocouple Type Measuring Range4°C Minimum Span1°C
TC Type K -200 to 1370 50
TC Type J -200 to 1200 50
TC Type T -210 to 400 25
TC Type R -10 to 1760 100
TC Type S -10 to 1760 100
TC Type E -200 to 1000 50
TC Type L -100 to 600 25
TC Type N -180 to 1300 50
TC Type [X]3User defined
Linearisation BS EN60584-01 BS 4937/IEC 584-1
(multi segment Polynomials)
Basic Measurement Accuracy 20.04 % FRI ±0.04 % RDG or 0.5 °C
(whichever is greater)
Thermal Drift Span 0.01 % / °C
Cold Junction Error ±0.5 °C
Cold Junction Tracking 0.05 °C / °C
Cold Junction Range (-40 to +85) °C
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2. 3 MILLIVOLT INPUT
Input Voltage Source
Range (-10 to 75) mV
Characterisation Linear, Custom [X] 3
Minimum Span 5 mV
Basic Measurement Accuracy 2±10 µV ±0.07 % Rdg
Input Impedance 10 MΩ
Thermal Drift Zero 0.1 µA / °C
Span 0.01 % / °C
2.4 SLIDEWIRE INPUT
Input 3 Wire potentiometer
Resistance Range (10 to 390) Ω(End to End) Larger values can be
accommodated by fitting a link, see Figure 2.
Characterisation Linear, Custom [X] 3
Minimum Span 15 % of FRI
Basic Measurement Accuracy 20.1 % FRI
Thermal Drift Zero 0.005 % of span / °C
Span 0.01 % / °C
Range (0 to 100) %
2.5 OUTPUT
Burnout Levels Low 3.75 mA , High 21.5 mA
Input out of Range Low 3.8 mA, High 20.5 mA
Output range (4 to 20) mA, Min. 3.75 mA, Max. 21.5 mA
Accuracy ±5 µA
Thermal Drift 1 µA / °C
Supply Voltage 5(10 to 40) V
Supply Voltage effect 0.2 µA / V
Maximum output load [(Vsupply-10)/21.5] KΩ. 250 Ωminimum loop load for correct
HART operation.5
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24 V
15 V
30 V
40 V
660
500
250 1400
10 V
0
NO HART
OPERATION
NOT RECOMMENDED
SUPPLY
VOLTAGE
MAXIMUM LOAD ( Ω )
OPERATION
