Mass Technologies, Inc.

P.O. Box 173187

Arlington, TX 76003-3187

 

SEM 1500TC
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Universal Thermocouple Input
Galvanically Isolated
Small Size
4 to 20 ma Output
High Performance
DIN Rail Mount

ISOLATING THERMOCOUPLE TRANSMITTER SEM1500TC
INTRODUCTION
The SEM1500TC is a universal thermocouple input DIN rail mounted transmitters designed to accept most common thermocouple types and to isolate and convert them to the industry standard 4 to 20 ma transmission signal.  Automatic cold junction compensation is provided.  The unit can also accept millivolt inputs between -5 and +50 millivolts from, for example, strain gages.

The small size of the unit enables many more units to be installed in a smaller space than was previously possible.  The output signal is galvanically isolated from the thermocouple by 500 VDC to remove the effects of ground loops or leakage.

INPUT SPECIFICATION @ 68 °F

.Thermocouple Types .J, K, N, R, S, T
.Millivolt .-5 to 50 mv signals
.Isolation .INPUT to OUTPUT
.500 VDC (Flash tested to 1 kV)
.Burn Out .UP scale standard (DOWN scale to order)
.Impedance .> 1M ohm
.Cold Junction .Automatic compensation may be selected for use with T/C types indicated or fixed zero compensation may be selected for mv or differential T/C measurement.
.CJ Accuracy .±0.4 ºF @ 68 ºF ±0.02 ºF/ºF Typical

OUTPUT

.Type .Passive 2 wire current output
.Range .4 to 20 ma (30 ma max.)
.Linearity .mv input linearity ±0.005%
.T/C ranges are cold junction compensated and directly referenced to T/C mv values.
.Protection .Reverse connection plus over voltage

GENERAL SPECIFICATIONS

.Supply .10 to 30 VDC
.Load .700 ohms @ 24 V
.Thermal Stability .1 µV/ºF
.plus cold junction errors
.Ripple Refection .<40 µA/V (measured at 1 V ripple 60 Hz)
.Response time .200 ms to reach 70% of final value
.Operating Temperature .Ambient 32 to 158 ºF
.Relative Humidity .Ambient 10-95% non-condensing

APPROVALS

.Tested to:  
.IEC 801-2 .Susceptibility to electrostatic discharge
.IEC 801-3 .Radiated Susceptibility
.IEC 801-4 .Susceptibility to conducted interference
.EN 55022 .Radiated emissions

ENCLOSURE

.Case Material .Polyamide (Grey)
.Case Flammability .To UL94-VO VDE 0304 Part 3 Level IIIA
.Mounting .Top Hat rail to DIN EN 50022-35
.Protection .IP20
.Connections .Captive screw connections
.Cable Size .12 AWG solid / 14 AWG stranded

STANDARD RANGES
The SEM1500TC may be purchased pre-ranged to any of the following standard ranges:

Range ºF
from    to		 Range  ºC
from    to		 THERMOCOUPLE TYPE millivolt
V
N K T J R S
32    212 0    100 * * * *      
32    392 0    200 * * * *      
32    752 0    400 * * * *      
32    1112 0    600 * *   *      
32    1472 0    800 * *   *      
32    1832 0    1000 * *     * *  
32    2192 0    1200 * *     * *  
32    2912 0    1600         * *  
Range mv
0    50 mv		 Range mv
0    50 mv		  
*

NON STANDARD RANGES
Units can be supplied set up to other non-standard ranges for a small extra charge or alternatively the unit can easily be re-ranges as follows:
ADJUSTMENTS (Range selection)
Range selection GAIN and OFFSET Coarse settings are made by two 16 position rotary screw adjustment switches on the side of the unit.  Fine adjustment is by front access potentiometers.  Full re-calibration details are supplied with each transmitter.

INPUT type OFFSET
RANGE ºF		 GAIN
RANGE ºF		 OFFSET
RANGE ºC		 GAIN
RANGE ºC
  at 4 ma 4 to 20 ma at 4 ma 4 to 20 ma
K T/C -328 to 752 212 to 2192 -200 to 400 100 to 1200
T T/C -328 to 752 212 to 2192 -200 to 300 100 to 400
J T/C -328 to 752 158 to 1382 -200 to 400 70 to 750
N T/C 392 to 752 302 to 2192 200 to 400 150 to 1200
R T/C 32 to 1832 932 to 3092 0 to 1000 500 to 1700
S T/C 32 to 1832 932 to 3200 0 to 1000 500 to 1760
V mv -5 to +15 mv 3 to 50 mv -5 to +15 mv 3 to 50 mv

DOWNLOADS
SEM1500TC Instruction Manual

SEM1500TC Literature


ORDER CODE

SEM1500 / Input Type  / value @ 4 ma   / value @ 20 ma   / ºF or ºC
 

 

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