DT4120 Resistance Thermometer

Product features

  • Pt100 / Pt500 / Pt1000, resistance / potentiometer inputs
  • 2 / 3 / 4 wire measurement
  • 5 digit LED display, 14.2 mm character height
  • 0.1 °C resolution
  • 0-20 mA / 4-20 mA, galvanic isolated output (optional)
  • 2 limit relay outputs (optional)
  • RS232 / RS485 communication, MODBUS RTU protocol (optional)
  • 96 × 48 mm panel instrument, < 50 mm built-in depth
  • 18-40 V AC/DC, 180-250 V AC/DC power supply
  • IP 65 (front) and IP 30 (rear) protection

Type designation

DT4120 resistance thermometer type designation

Product description

The DT4120 … Resistance Thermometer enable process temperature or resistance value to be displayed on the control panel Pt100 / Pt500 / Pt1000 temperature sensor, resistor or potentiometer can be connected to the input of the instrument, either with 2, 3 or 4 wire.
Large 5 digit, 14.2 mm character height LED display make process value easily visible at a distance.
The instrument is available with the following output options:

  • 2 normally open relay contacts (SPST) for limit switching or for simple control tasks
  • 0-20 mA / 4-20 mA galvanic isolated scalable current output *
  • RS232 / RS485 galvanic isolated communication output with MODBUS RTU slave protocol *
  • transmitter supply galvanic isolated 15 VDC 20 mA*.

(* either analogue or communication or transmitter supply option can be implemented at the same time)

The functional parameters can be set by push-buttons on the front panel of the device, through a simple menu system: input selection, averaging of input signals, scaling, display frequency, limit values, limit operating modes, scaling the analogue output, etc. The settings are protected by a two-level password against unauthorised manipulation.The thermometer able to calculate with three sensor calibration point, to fit the real sensor curve to the instrument. The instruments has two power supply versions: 18-40 V AC/DC (DT4120 …) or 180-250 V AC/DC (DT4120 … PS).
The DT4120 … is housed in a DIN standard 96 × 48 mm ABS case with IP 65 protection from the front and IP 30 protection from the back side, for installation on the control panel.

Technical specifications

Safety data:
The connection terminals of the supply voltages are isolated from each other, the isolation is in compliance with the standard EN 61010-1, taking into consideration the following:
Pollution level:2
Measurement category:II
Input parameters:
Input signal:Pt100 / Pt500 / Pt1000, resistance, potentiometer
Measurement range:-200 - +800 °C / 0-4000 Ohm
Connection:2, 3 or 4 wire
Sampling:12 measurement / sec.
Number of averaged samples:1 / 2 / 4 / 8 / 16 / 32 / 64 (selectable)
Error of displayed value:< 0.2 °C (Ta = 23 °C ± 2 °C)
Output parameters:
Analogue output (optional):
Output type:1 active or passive DC current (scalable)
Range:0-20 mA / 4-20 mA
Burden:500 ohm (max.)
Error:< 0.03% (Ta = 23 °C ±2 °C)
Limit outputs (optional):
Outputs:2 NO SPST relays
Contact rating:30 VDC, 3 ADC / 240 VAC, 3 AAC
Transmitter supply (optional):
Output voltage:15 VDC ±10% @ 30 mA, 16 VDC ±10% @ 4 mA
Output current:30 mA max.
Isolation voltage:0.5 kV
Communication interface (optional):
Type:RS232 or RS485 (isolated)
Protocol:Modbus RTU slave
Baud rate:300 / 600 / 1200 / 2400 / 4800 / 9600 Baud
Display:
Display:5 digit (+ values), 4 digit (- values), negative sign, decimal point
Display unit:5 digit LED, 14.2 mm character height
Manual controls:
Manual controls:3 membrane push-buttons on the front cover
Power supply:
Power supply:18-40 V AC/DC (DT4120 ...)
180-250 V AC/DC (DT4120 ... PS)
Consumption:3.5 W / 3 VA
Ambient conditions:
Operating temperature range:0 - +60 °C (-20 - +60 °C for customer request)
Relative humidity:90% (max., non-condensing)
Place of installation:cabinet
Electromagnetic compatibility (EMC)
accordance with the standard EN 61326-1
Immunity:industrial area
Noise emission:Group 1, Class B
General data:
Housing:panel instrument
Connection:plug-in screw terminal / push-in direct connection
Connection cable:0.25-1.5 mm2 (max.)
Dimensions96 × 48 × 45 mm (width × height × depth)
Weight0,15 kg
Protection:IP 65 (front), IP 30 (rear)
Detailed information see in operating instructions. The Manufacturer maintans the right to change the technical data!

Downloads

Leaflet of productOperating Instruction

Application examples

Analog output option:

DT4120 resistance thermometer application example 1

 

RS232 communication interface option:

DT4120 resistance thermometer application example 2

 

RS485 communication interface option:

DT4120 resistance thermometer application example 3

 

RS485 bus topology:

DT4120 resistance thermometer application example 4

Type selection and ordering

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