D1400 RTD Input Modules


The D1400 series modules measure RTD (Resistance Temperature Detector) sensors. RTD sensors are resistors that have a very predictable change in resistance vs temperature. They are available in 2-wire, 3-wire and 4-wire versions. The D1400 contains four sensor input terminals and will accept any of the three wiring methods. One of the four terminals is an excitation current output signal for the sensor.

The excitation current signal is passed through the sensor to generate a voltage. An isolated 15-bit analog to digital converter is used to measure the voltage across the sensor. The digital data values are linearized into scaled temperature values. The temperature values can be scaled in either Celsius or Fahrenheit.

The D1400 RTD input modules include one open-collector digital output that can be used to control solid-state relays and annunciators or be programmed as a LO alarm output based on the RTD temperature. The digital output can be pulled up to +30Vdc and sink up to 30mA without damage.

The scaled temperature values are transmitted to a host computer via an RS-232 or RS-485 serial port.

Use the links below to download a D1000 Series Datasheet or User’s Manual.

Download Datasheet

Download Manual

The D1400 RTD input modules can be mounted on a DIN-Rail using the MK-1 mounting kit.

Measurement Ranges:
0.00385: -200 to +850C
0.00388: -100 to +125C
0.00392: -200 to +600C

Additional information

Dimensions 3.6 × 2.45 × 1.1 in

• RTD Types: 0.00385, 0.00388, 0.00392
• Accuracy: +/-0.3 deg C. • Resolution: 0.1 degree (C or F).
• Common mode rejection: 100db at 50/60 Hz.
• User selectable degrees C or F scaling.
• Input connections: 2,3, or 4 wire.
• Excitation current: 0.25mA.
• Max lead resistance: 50 ohms.
• Input protection to 120Vac.
• Automatic linearization and lead compensation.
• One open collector digital output (or LO Alarm).

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