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TW303
RTD INPUT
TWO-WIRE TRANSMITTER
50 MM X 50 MM CASE
FEATURES
 | Provides DC Output Proportional to an RTD Input |
| 3-Wire or 2-Wire, 100 ohms to 2000 ohms RTDs |
| Linearized for Platinum RTDs |
| Unlimited* Choice of Input Ranges |
| Low-Drift Chopper-Stabilized Input |
| NEMA-4 Connection Head Available |
| Low Cost |
| 5 + 5 Year Warranty |
DESCRIPTION
The TW303 is a low-cost, reliable, RTD input, 2-Wire transmitter for field or
panel mounting in various industrial housings and enclosures. It provides
a DC output current proportional to an RTD input signal.
Linearization for platinum RTD inputs, low-drift chopper-stabilized amplifiers,
and filtering and conditioning to reduce susceptibility to transients and noisy
operations provide accurate, trouble-free operation. Optional conformal coating
of the electronic components makes the TW303 extremely reliable and resistant to
the corrosion, moisture and fungus associated with many industrial environments.
The module utilizes a single constant current source to excite the RTD. An
accurate and stable leadwire compensation circuit
uses the third lead of the 3-Wire RTD to compensate for the RTD lead resistance.
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.
TYPICAL APPLICATION
Remote temperature data acquisition.
MOUNTING
The TW303 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
RTD INPUT
3-wire or
2-wire,
100 ohms to 2000
ohms
INPUT RANGE
max span RTD
limit
min span 50°F/28°C
EXCITATION CURRENT
100
ohms
500
ohms
1000 ohms
2000 ohms
|
1
mA
1
mA
0.5
mA
0.2
mA
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OUTPUT RANGE
4/20
mA
LOAD RESISTANCE
Rmax = (Vsupply -
12V/.020 mA) kilohms
RESPONSE TIME
50 ms
typical
ACCURACY
±0.1% of
span or 0.02 ohms
whichever is
greater
OPEN SENSOR RESPONSE
Upscale
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LINEARITY
(Pt RTD, output vs temp)
±0.05% of
span (temp > = 32°F/0°C)
±0.15% of span (temp < 32°F/0°C)
(Others, output vs res)
±0.01% of span
COMMON MODE REJECTION
120 dB, DC to 60 Hz
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
12-48 VDC, Polarity protected
SUPPLY VOLTAGE
EFFECT
0.02% of span max,
12 to 48 V
*Within specified range limits
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CONNECTIONS
Power Supply
+
Power Supply
-
Excitation/RTD Input
Input
-
Lead Compensator |
(Labeled)
P.S.1
P.S.2
RTD 1
RTD 2
RTD
3 |
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