SEM 203TH

	PUSH BUTTON Calibration
	Thermistor Sensor Input
	In-Head Mounting
	Temperature Linear Output
	Small Spans 10 °F
	Re-Rangeable Without A Computer

PUSH BUTTON THERMISTOR TEMPERATURE TRANSMITTER SEM203TH

INTRODUCTION
The SEM203TH Transmitter connects to a standard thermistor and produces a 4-20 mA signal that is linear with temperature. Two models are available. One accepts a 2252 ohm thermistor, the other a 10K ohm thermistor. The transmitter can be mounted in a junction box for attaching directly to the temperature sensor or for surface mounting to a wall or duct. A digital indicator can be incorporated. An optional DIN rail adaptor is available.

The simple push of a button ranges and calibrates the SEM203TH transmitter. There is no need for jumpers or potentiometer adjustments. The high accuracy, stability, flexibility and low cost of the SEM203TH make it feasible to use a thermistor in many more applications.

CALIBRATION PROCEDURE:

Connect a thermistor simulator or resistance decade box to the input and between 8 & 30 volts DC to the output of the SEM203TH.
Set the simulator to the desired temperature or decade box to the resistance corresponding to the temperature at 4 mA. Press and HOLD the calibration button until the LED starts to blink and then release.
Set the simulator to the desired temperature or decade box to the resistance corresponding to the temperature at 20 mA. Press the calibration button and release. The LED continues blinking and then shuts off confirming that the transmitter is calibrated.

It's that simple and that fast.

SPECIFICATION @ 68 °F
INPUT / OUTPUT SENSORS AND RANGES

.INPUT
.Input Types Available	.2252 ohm - SEM203TH-1
.Input Types Available	.10 K ohm - SEM203TH-2 .common thermistor resistance curve .having a ratio of 9.07 between 0 to 50 °F
.Max. Excitation Current	.2252 ohms 240µA
.Max. Excitation Current	.10 K ohms 100µA
.Range	.-13 to 257 °F
.Minimum Span	.10 °F
.Burnout	.Upscale 22 mA (Downscale preset current to order)
.Sensor Lead Length	.<18" to 710' to maintain CE compliance
.Sample Rate	.500 mS per Reading
.Accuracy	.±0.25 °F within 32 to 212 °F .±0.35 °F within -13 to 257 °F
.Thermal Drift	.Zero ±0.01 °F/°F .Span 50 ppm
.Connections	.Screw Terminals

.OUPUT
Output	.4 to 20 mA (2 Wire Loop Powered) .(Can be ranged 20 to 4 mA)
.Max. Output Range	.3.8 to 22 mA
.Operating Voltage	.8 to 30 VDC
.Accuracy	.±5 µA
.Thermal Drift	.±1 µA/°F
.Response Time	500mS to reach 70% of final value
.Loop Resistance	.800R @ 24 VDC
.Loop Sensitivity	.0.4 µA/volt
.Loop Noise	.±0.001 µA
.Protection	.Reverse Polarity Protected
.Connectors	.Screw Terminals
.Input/Output Isolation	.Not Isolated
.Warm-up Time	.2 Minutes to full accuracy
.EMC	.Emissions BS EN61326 .Susceptibility BS EN61326
.Ambient Temperature Range	.-4 to 176 °F
.Ambient Storage	.-40 to 176 °F
.Ambient Humdidity	.0 to 95% (Non condensing)
.Dimensions	.1.9"[43mm] Diameter .0.83" [21mm] Height
.Weight	.25 grams
.Default Range	.0-100 °C. Contact sales office for .factory configuration to any other range.

DOWNLOADS
SEM203TH Instruction Manual

SEM203TH Literature

ORDER CODE

.SEM203TH-1 2252 ohm Thermistor .SEM203TH-2 10K ohm Thermistor .Accessories:
	.DIN Rail Adapter	.RMK-2
	.Junction Box	.SCH4-A	.1 side port
		.SCH4-B	.2 side ports (shown)
		.SCH4-C	.1 side & 1 base port
		.SCH4-D	.2 side & 1 base port
	.Digital Indicator	.DM400	.(See Bulletin 6.01/5M)