Mighty Module Model TW303
RTD Input Two Wire Transmitter


CONNECTIONS
Power Supply +
Power Supply -
Excitation/RTD Input
Input -
Lead Compensator
(Labeled)
P.S.1
P.S.2
RTD 1
RTD 2
RTD 3
RTD,Input,Two Wire Transmitter,Model TW303,Wilkerson Instrument

RTD,Input,Two Wire Transmitter,Model TW303,Wilkerson Instrument

Features

RTD,Input,Two Wire Transmitter,Model TW303,Wilkerson Instrument Provides DC Output Proportional to an RTD Input
RTD,Input,Two Wire Transmitter,Model TW303,Wilkerson Instrument 3-Wire or 2-Wire, 100 ohms to 2000 ohms RTDs
RTD,Input,Two Wire Transmitter,Model TW303,Wilkerson Instrument Linearized for Platinum RTDs
RTD,Input,Two Wire Transmitter,Model TW303,Wilkerson Instrument Unlimited* Choice of Input Ranges
RTD,Input,Two Wire Transmitter,Model TW303,Wilkerson Instrument Low-Drift Chopper-Stabilized Input
RTD,Input,Two Wire Transmitter,Model TW303,Wilkerson Instrument NEMA-4 Connection Head Available
RTD,Input,Two Wire Transmitter,Model TW303,Wilkerson Instrument Low Cost
RTD,Input,Two Wire Transmitter,Model TW303,Wilkerson Instrument 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 Applications

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 50F/28C

EXCITATION CURRENT

100 ohms
500 ohms
1000 ohms
2000 ohms
1 mA
1 mA
0.5 mA
0.2 mA

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

LINEARITY
(Pt RTD, output vs temp)
  0.05% of span (temp > = 32F/0C)
  0.15% of span (temp < 32F/0C)
(Others, output vs res)
  0.01% of span

COMMON MODE REJECTION
120 dB, DC to 60 Hz

OPERATING TEMPERATURE
-13F to 176F
-25C to 80C

TEMPERATURE STABILITY
0.02% of span or 0.025C/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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