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Thermocouple Signal Conditioner | Input Socket Mount
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The SMSC-TC isolating thermocouple conditioner
offers wide ranging input and output capability. The
SMSC-TC can be field configured by the user to accept
input from thermocouple Types J, K, T, E, R, S, and B
and to provide current or voltage output. The output is
linearized to temperature according to the particular
thermocouple type.
The SMSC-TC is a three-port industrial isolator—the
output is optically isolated from the input up to 1500 V,
and both input and output are transformer isolated
from the line power. Isolation allows the noise reduction
benefits of grounded thermocouples to be realized
without creating ground loop problems and it provides
faster response. The SMSC-TC utilizes the latest in
advanced analog/digital signal processing technology.
In addition to its multiple microprocessors, it employs
special ASIC circuitry for high accuracy and reliability.
The SMSC-TC is equipped with cold-junction
compensation (CJC) circuitry to provide icepoint
reference. Upscale, downscale or disabled
thermocouple burnout detection is switch selectable.
The SMSC-TC is useful in any application requiring an
isolated DC output from a thermocouple input. Typical
applications include energy management and data
acquisition of process temperatures. The output of the
SMSC-TC can drive a digital meter for direct display
or interface with a computer for monitoring and control
applications.
Model SMSC-TC is equipped with top-mounted LEDs
for INPUT (green), TROUBLE (yellow) and CAL OK
(yellow). At start-up, both the INPUT and the CAL OK
LEDs light up momentarily for 1 second. Afterwards,
these LEDs flash alternately for 10 seconds while
startup takes place.
The input LED is a diagnostic tool. It remains
continuously lit if the measured temperature is within
the selected range of the thermocouple. However, if
the measured temperature is outside the full range
of the thermocouple (for example, for a Type J below
minus 200°C or above 750°C), the LED will flash at a
rate of 4 or 8 Hz for under/over range, respectively. If
the thermocouple is within the full temperature range,
but outside the selected sub-range (for example, if a
Type J thermocouple is set for a range of 375 to 500°C
and the temperature is either below 375°C or above
500°C) the LED will flash at 0.5 or 1 Hz respectively.
The CAL OK LED is continuously on when the device
is properly storing the factory calibration reference
voltage. The TROUBLE LED is off during normal
operation of the device.
A major advantage of the SMSC-TC is its wide ranging
capabilities and ease of configuration. The SMSC-TC
enables 50% input zero and span adjustability within
the selected sub-range.
For example for Type E thermocouple range from
-18 to 125°C, since the span can be contracted by
50%, this enables an input span as narrow as 50%
of 143, or 72°C. This span can then be positioned
anywhere within the temperature range and can have
a zero step-up as large as 50% of the full scale range
(e.g. span can start as high as 53°C).
The factory default configuration for the model SMSC-TC is as follows:
Input: Type J
Range: 0 to 500°C (32 to 932°F)
Output: 4 to 20 mA
Burn Out: Upscale
Specifications
INPUT
Ranges: Field configurable, see table
Impedance: >1 MΩ
Input Bias Current (Burnout Detection): <1.5 µA
Overvoltage: ±10V differential
Common Mode (Input to Ground): 1500 Vdc or peak AC, max
Zero and Span Range:
Zero Turn-Up: 0 to 50% of full scale range
Span Turn-Down: 100 to 50% of full scale range
OUTPUT
Voltage Output (Dip-Switch Selectable):
Ranges: 0 to 5 V, 0 to 10 V
Impedance: <10 Ω
Drive: 10 mA max (1 kΩ min)
Current Output (Dip-Switch Selectable):
Ranges: 0 to 1 mA, 4 to 20 mA
Impedance: >100 kΩ
Compliance: 10 V max (500 Ω max @ 20 mA)
Response Time (10 to 90%): 500 mSec, typical
Stability: ±0.04%/°C of full scale range
Isolation: 1500 Vdc or peak AC between input, output and power
ESD Susceptibility: Meets IEC 801-2, Level 2 (4 kV)
Common Mode Rejection: DC to 60 Hz: 120 dB
LED Indicators:
Trouble LED: Yellow - off during normal device operation
Input LED: Green - continuously on if input is within
selected range, flashes otherwise
CAL OK LED: Yellow - continuously on in normal device
operation
Thermocouple Burnout Detect: Field-configurable Upscale or Downscale, or disabled
Humidity (Non-Condensing):
Operating: 25 to 95% RH @ 45°C (113°F)
Soak: 90% RH for 24 Hours @ 65°C (149°F)
Temperature Range:
Operating: 0 to 60°C (32 to 140°F)
Storage: -15 to 75°C (5 to 167°F)
Power:
Consumption: 3 W typical, 5 W max
Standard: 120 Vac ±10%, 50 to 60 Hz
Optional: 240 Vac
Weight: 282 g (0.62 lb)
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† All dollar amounts on this site are shown in Singapore currency.
Note: Comes complete with operator’s manual.
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Keywords:signal conditioner, thermocouple conditioner, socket mount, field configurable
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