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TW304
THERMOCOUPLE INPUT
TWO-WIRE TRANSMITTER
50 MM X 50 MM CASE
FEATURES
 | Provides DC Output Proportional to any Thermocouple Input |
| Cold Junction Compensated |
| 4 mV Minimum Input Span |
| Unlimited* Choice of Input Ranges |
| Upscale Burnout Protection |
| Low-Drift Chopper-Stabilized Input |
| NEMA-4 Connection Head Available |
| Low Cost |
| 5 + 5 Year Warranty |
DESCRIPTION
The TW304 is a low cost, reliable, thermocouple input, 2-wire transmitter for
field or panel mounting in various industrial housings and enclosures. It
provides a DC output current proportional to any thermocouple input signal.
Cold junction compensation, low-drift chopper-stabilized amplifiers and
filtering and conditioning to reduce susceptibility to transients and noisy
operations, provide accurate, trouble free operation. Optional coating of the
electronic components makes the TW304 extremely reliable and resistant to the
corrosion, moisture and fungus associated with many industrial environments.
The output ZERO and SPAN controls are accessible through the top of the case.
Terminations are made to screw terminal connectors on the top of the case. Cold
junction compensation is provided by a solid state temperature sensor embedded
in the thermocouple terminal strip. Upscale burnout protection is provided as
standard. In the event the thermocouple opens, the transmitter output will go
offscale high.
TYPICAL APPLICATION
Remote temperature data acquisition.
MOUNTING
The TW304 can be mounted in a connection head (TSH-A6L) or on a flat surface
using the two 5/32 inch holes provided. The 17/64 inch center hole allows
clearance for a 1/4 inch diameter temperature probe.
SPECIFICATIONS
INPUT RANGE
select any type thermocouple
(min span 4
mV)
OUTPUT RANGE
4/20
mA
LOAD RESISTANCE
Rmax = (Vsupply - 12V/.020 mA) kilohms
RESPONSE TIME
150 ms
typical
ACCURACY
±0.1% of span
COMMON MODE REJECTION
120 dB, DC to 60
Hz
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OPERATING TEMPERATURE
-13°F to 176°F
-25°C to 80°C
TEMPERATURE STABILITY
±0.02% of span or 0.025°C/°C
whichever is greater
POWER REQUIRED
12 to 48 VDC, Polarity protected
SUPPLY VOLTAGE EFFECT
0.02% of span max,
12 to 48 VDC
*Within specified range limits.
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| CONNECTIONS
Power Supply
+
Power Supply
-
Input
+
Input
-
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(Labeled)
PIN P.S. +
PIN P.S. -
PIN T/C +
PIN T/C -
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