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
1
25 °C
Linearisation
BS EN60751 (IEC 751) BS 1904
(DIN 43760), JISC 1604, CUSTOM [X]
3
Max Lead Resistance
50
Ω
per 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 Range
4
°C
Minimum Span
1
°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]
3
User defined
Linearisation
BS EN60584-01 BS 4937/IEC 584-1
(multi segment Polynomials)
Basic Measurement Accuracy
2
0.04 % 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 M
Ω
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
1
5 % of FRI
Basic Measurement Accuracy
2
0.1 % 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] K
Ω
. 250
Ω
minimum loop load for correct
HART operation.
5
Page 2
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
