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SR2401
THERMOCOUPLE INPUT
ISOLATED
FIELD RANGEABLE
TWO-WIRE TRANSMITTER
FEATURES
 | Provides DC Output Proportional to any Thermocouple Input* |
| Fully Isolated Input/Output |
| Unlimited** Choice of Input Ranges via Interchangeable Range Cards |
| Reverse Polarity-Protected |
| Upscale or Downscale Burnout Protection |
| Test Points for Loop Current Monitoring Without Breaking Loop Circuit |
| 50 mm Diameter Case - 33 mm Mounting Hole Spacing |
| NEMA-4 and Explosion-Proof Connection Heads Available |
| Intrinsically Safe Design with FM & CSA Approvals Pending |
| Low Cost |
| 5 + 5 Year Warranty |
DESCRIPTION
The SR2401 is a low-cost, reliable, thermocouple input two-wire transmitter for field or panel mounting in various industrial housings and
enclosures. It provides a DC output current (4/20 mA) proportional to a
thermocouple input.
The SR2401 includes filtering and conditioning to reduce susceptibility to
transients and noisy operations. The SR2401 provides isolation by using
a feedback VCO to develop a pulse train with a duty cycle proportional to the
input signal amplitude. This pulse train is coupled through a pulse
transformer to the output circuitry, where the duty cycle data is converted to a
4/20 mADC output level proportional to the millivolt signal from the
thermocouple.
Ranging is accomplished via a plug-in range card which characterizes the input
to the desired thermocouple type and sets the temperature range and burnout
protection (upscale or downscale). Cold junction compensation is provided
by a solid state temperature sensor embedded in the thermocouple input terminal
strip. The output ZERO and SPAN controls are accessible through the top of
the case. Zero is adjustable ± 20% and span ± 15%. Terminations
are made to screw terminal connectors on the top of the case.
Test points located on the transmitter's front panel allow verification of loop
current value, using a milliammeter, without breaking the loop current.
TYPICAL APPLICATIONS
Remote temperature data acquisition. Elimination of ground loops and common
mode signals.
MOUNTING
The SR2401 can be mounted in a thermocouple connection head
(TSH-A6L), explosion-proof housing (XJAY), or on a flat surface using the two
4.5 mm diameter mounting holes provided. Standard 33 mm hole center spacing
allows for mounting in most connection heads. The 5.08 mm center hole allows
clearance for input wiring or for a 3/16 inch diameter temperature probe. An
optional DIN-Rail mounting kit is available (DMP2000).
SPECIFICATIONS
INPUT RANGE
Select any type
thermocouple
(minimum span 4 mV)
TEMPERATURE STABILITY
± 0.01% of span per°C
POWER
10-36 VDC, polarity
protected
OUTPUT RANGE
4/20
mA
Current limited = 35
mA
SUPPLY VOLTAGE EFFECT
0.02% of span
max 10-36 VDC
ISOLATION
Output to Input
1000 Volts RMS sine wave
OPERATING TEMPERATURE
-13°F to 176°F
-25°C to
80°C
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ACCURACY
± 0.1%
of span
INPUT IMPEDANCE
10 megohms
LINEARITY
Better than ± 0.05% of span (mV)
(input to output)
COMMON MODE REJECTION
120 dB, DC to 60 Hz
MAX LOAD RESISTANCE
= [(V supply - 10)/20 mA] kilohms
RESPONSE TIME
- Step Change
250 ms for 99% of final value
* For linearized output see
SC5000 series
** Within Specified Range Limits
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ORDERING INFORMATION
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SR2401,
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Burnout |
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US - Upscale on Open Sensor |
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DS = Downscale on Open Sensor |
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Temperature Range |
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(Specify F or C) |
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Sensor Type
J, K, R, S, T, E, N, etc. |
Example: SR2401,J,0/500F,US
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