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Product short description:
  • Dual channels
  • RTD (Pt, Ni, Cu), 0-4500 ohm inputs
  • 4-20mA output (sink/source)
  • 7-32V DC loop power

The DT235 model is a two-wire dual transmitter that isolates and converts RTD or linear resistance sensor inputs to a proportional 4-20mA control signal.

Click here to watch a short video highlighting the features of the DT235.

RTD / Resistance Input Two-Wire Dual Transmitter Description

DT230 series signal conditioners provide two independent I/O channels in a single, space-saving unit. The DT235 model is a two-wire dual transmitter that isolates and converts RTD or linear resistance sensor inputs to a proportional 4-20mA control signal. Power is received from the output loop current or a DC supply when using a three-wire connection.

High-voltage isolation separates all input and output circuits from each other. Isolation protects from surges, reduces noise, and eliminates ground loop errors.

Setup and calibration are fast and easy with a convenient USB connection to your PC and Acromag’s Windows configuration software. The Android app enables setup with mobile devices.

Advanced signal processing capabilities, variable range input/output, and convenient USB programming make this instrument very versatile. These transmitters can withstand harsh industrial environments and operate reliably across a wide temperature range with very low drift. They feature RFI, EMI, ESD, EFT, and surge protection plus low radiated emissions.

Performance Specifications

IMPORTANT: To prevent ground loop error between a grounded PC and a grounded input signal, Acromag strongly recommends use of a USB isolator like Acromag’s USB-Isolator when configuring a DT230 Series transmitter.

USB Interface

USB Connection
Type: USB Mini-B type socket, 5-pin.
Data Rate: 12Mbps. USB v1.1 and 2.0 compatible.
Maximum cable length: 5.0 meters.
Transient voltage suppression on power and data lines.

Input (two channels)

Default Configuration
Input: 100Ω Pt RTD, 3-wire, =0.00385, -200 to 850°C, medium filter.
Output: 4 to 20mA, upscale break detect.

A/D Converters (ADC)
Two 24-bit Sigma Delta ADCs (only 16-bits used).

Input Ranges
Input Type                                  Range                     Accuracy
RTD, Pt 100Ω                          -200 to 850°C               ±0.25°C
RTD, Pt 200Ω                         -200 to 850°C                ±0.30°C
RTD, Pt 500Ω                         -200 to 850°C                ±0.50°C
RTD, Pt 1000Ω                       -200 to 850°C                ±1.0°C
Ni 120Ω (Minco 7-120)          -80 to 320°C                ±0.08°C
Cu 10Ω (Minco 16-9)           -200 to 270°C                 ±1.0°C
Resistance (linear)                     0 to 25Ω                    ±0.05Ω
Resistance (linear)                     0 to 450Ω                  ±0.10Ω
Resistance (linear)                     0 to 9000Ω               ±0.90Ω
Resistance (linear)                     0 to 2250Ω               ±2.25Ω
Resistance (linear)                     0 to 4500Ω               ±4.50Ω

Ambient Temperature Effect: Better than ±80ppm/°C (±0.008%/°C).

Scaling Adjust: Full range.

Lead Break (Sensor Burnout) Detection: Upscale/downscale.

Input Over-Voltage Protection: Bipolar Transient Voltage Suppression (TVS) and diode clamping.

Input Filter: RC filter plus variable digital filter (none, low, medium, high).

Input Bandwidth: -3dB @ 16Hz (no filtering).

Noise Rejection (@ 60Hz, no filter)
Common Mode: 101dB no filter.
Normal Mode: 11dB no filter.

Output (two channels)

D/A Converters (DAC): Two 16-bit D/A converters.

Output Ranges: 4-20mA DC 3.5-24mA under/over-range capability.

Output Accuracy: ±0.05%, typical. ±0.1%, maximum.

Output Compliance
Rload = (Vsupply – 7V) / 0.020A.
Rload = 0 to 850 ohms @ 24V DC.

Output Response Time (for step input change)

Time to reach 98% of output value (typical)
No filtering               34 milliseconds
Low filter                  80 milliseconds
Medium filter        214 milliseconds
High filter            1238 milliseconds

Output Ripple: Less than ±0.1% of output span.

Environmental

Operating Temperature

Operation: -40 to 80°C (-40° to 176°F).

Storage: -40 to 85°C (-40 to 185°F).

Relative humidity: 5 to 95% non-condensing.

Power Requirement: Loop-powered, 7-32V DC SELV, 24mA max.

Isolation: 1500V AC peak. 250V AC (354V DC) continuous isolation between input and output circuits.

Shock and Vibration Immunity
Vibration: 4g, per IEC 60068-2-6.
Shock: 25g, per IEC 60068-2-27.

Approvals 
CE compliant. Designed for UL/cUL Class I Division 2 Groups ABCD, ATEX / IECEx.

Electromagnetic Compatibility (EMC) Compliance

Radiated Emissions: BS EN 61000-6-4, CISPR 16.

RFI: BS EN 61000-6-2, IEC 61000-4-3.

Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.

ESD: BS EN 61000-6-2, IEC 61000-4-2.

EFT: BS EN 61000-6-2, IEC 61000-4-4.

Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.

Physical

General: General-purpose enclosure designed for mounting on 35mm “T-type” DIN rail.

Case Material: Self-extinguishing polyamide, UL94 V-0 rated.

I/O Connectors: Removable plug-in terminal blocks rated for 12A/250V; AWG #26-12, stranded or solid copper wire.

Dimensions: 17.5 x 114.5 x 99.0 mm (0.7 x 4.51 x 3.90 inches).

Unit weight: 0.16 kg (0.35 pounds).

Shipping Weight: 0.22 kg (0.5 pounds) packed.

  • Operate as a dual transmitter, a single transmitter, or a signal splitter
  • Easy configuration via USB with Windows software or Agility™ app for Android
  • Independently adjustable and scalable: input and output ranges
  • Selectable RTD and linear resistance input types: Pt 100/200/500Ω, Ni 120Ω, Cu 10Ω, 0-4500Ω
  • 4-20mA current loop outputs support sinking or sourcing circuit configurations
  • Supports reverse-acting (inverse) output
  • User-configurable output range clamp levels support NAMUR-compliant operation
  • Selectable up/downscale sensor break detection
  • Very low 7V two-wire loop burden
  • High accuracy, linearity, stability, and reliability
  • User-selectable filtering (none, low, med., high)
  • Space-saving 17.5mm (0.7 inch) unit with pluggable terminals for convenient wiring
  • 1500V isolation, 4-way (inputs/outputs)
  • Wide ambient operation (-40 to 80°C)
  • Approvals: CE compliant. UL/cUL Class I Div 2, ATEX/IECEx Zone 2

 

 

 

 

 

The Best Temperature Sensor for Process Control: Thermocouple vs RTD - 8500918 (Log in to view the file)
Criteria for Temperature Selection of T/C and RTD Sensor Types This is part three of a comprehensive three-part series that provides information for choosing an industrial temperature sensor from Thermocouple (T/C) and Resistance Temperature Detector (RTD) sensor types. Thermocouple vs RTD Many users simply look to fill the basic needs of their application and do...
How to use RTDs for Temperature Measurement - 8500917 (Log in to view the file)
Criteria for Temperature Selection of T/C and RTD Sensor Types This is part two of a comprehensive three-part series that provides information for choosing an industrial temperature sensor from Thermocouple (T/C) and Resistance Temperature Detector (RTD) sensor types. The Basics of Temperature Measurement Using RTDs A Resistance Temperature Detector (RTD) is a passive circuit element...

Specifications

Manuals

DT235 User Manual (Log in to download the file)

TTC-SIP: Software Interface Package Information Page (Log in to download the file)
DT230 and DT330 Configuration Software (Log in to download the file)
Agility Config Tool (Tethered) (Log in to download the file)
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    4001-252: DIN Rail End Stops

    • DIN rail end stop for hazloc approvals
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    DT230-Config/Cal: Calibration Service

    • Factory custom configuration/calibration service.
    • Specify input type, input/output zero and full-scale values, filtering, and sensor fault settings on order.
    Select options
  • Compare

    USB Cables

    4001-112: USB cable, 1 meter, with Type A to Type B plugs. 4001-113: USB cable, 1 meter, with Type A to Mini-B plugs. 5028-565: USB-OTG cable, 6 inches
    Select options

Additional information

Weight 8 oz
Dimensions 1 × 5 × 4 in
Part Number

DT235-0600: Two-wire dual transmitter

Configuration

Agility Mobile App, Windows Software Configuration

Product Series

DT230 Series

  • Description

    RTD / Resistance Input Two-Wire Dual Transmitter Description

    DT230 series signal conditioners provide two independent I/O channels in a single, space-saving unit. The DT235 model is a two-wire dual transmitter that isolates and converts RTD or linear resistance sensor inputs to a proportional 4-20mA control signal. Power is received from the output loop current or a DC supply when using a three-wire connection.

    High-voltage isolation separates all input and output circuits from each other. Isolation protects from surges, reduces noise, and eliminates ground loop errors.

    Setup and calibration are fast and easy with a convenient USB connection to your PC and Acromag’s Windows configuration software. The Android app enables setup with mobile devices.

    Advanced signal processing capabilities, variable range input/output, and convenient USB programming make this instrument very versatile. These transmitters can withstand harsh industrial environments and operate reliably across a wide temperature range with very low drift. They feature RFI, EMI, ESD, EFT, and surge protection plus low radiated emissions.

    Performance Specifications

    IMPORTANT: To prevent ground loop error between a grounded PC and a grounded input signal, Acromag strongly recommends use of a USB isolator like Acromag’s USB-Isolator when configuring a DT230 Series transmitter.

    USB Interface

    USB Connection
    Type: USB Mini-B type socket, 5-pin.
    Data Rate: 12Mbps. USB v1.1 and 2.0 compatible.
    Maximum cable length: 5.0 meters.
    Transient voltage suppression on power and data lines.

    Input (two channels)

    Default Configuration
    Input: 100Ω Pt RTD, 3-wire, =0.00385, -200 to 850°C, medium filter.
    Output: 4 to 20mA, upscale break detect.

    A/D Converters (ADC)
    Two 24-bit Sigma Delta ADCs (only 16-bits used).

    Input Ranges
    Input Type                                  Range                     Accuracy
    RTD, Pt 100Ω                          -200 to 850°C               ±0.25°C
    RTD, Pt 200Ω                         -200 to 850°C                ±0.30°C
    RTD, Pt 500Ω                         -200 to 850°C                ±0.50°C
    RTD, Pt 1000Ω                       -200 to 850°C                ±1.0°C
    Ni 120Ω (Minco 7-120)          -80 to 320°C                ±0.08°C
    Cu 10Ω (Minco 16-9)           -200 to 270°C                 ±1.0°C
    Resistance (linear)                     0 to 25Ω                    ±0.05Ω
    Resistance (linear)                     0 to 450Ω                  ±0.10Ω
    Resistance (linear)                     0 to 9000Ω               ±0.90Ω
    Resistance (linear)                     0 to 2250Ω               ±2.25Ω
    Resistance (linear)                     0 to 4500Ω               ±4.50Ω

    Ambient Temperature Effect: Better than ±80ppm/°C (±0.008%/°C).

    Scaling Adjust: Full range.

    Lead Break (Sensor Burnout) Detection: Upscale/downscale.

    Input Over-Voltage Protection: Bipolar Transient Voltage Suppression (TVS) and diode clamping.

    Input Filter: RC filter plus variable digital filter (none, low, medium, high).

    Input Bandwidth: -3dB @ 16Hz (no filtering).

    Noise Rejection (@ 60Hz, no filter)
    Common Mode: 101dB no filter.
    Normal Mode: 11dB no filter.

    Output (two channels)

    D/A Converters (DAC): Two 16-bit D/A converters.

    Output Ranges: 4-20mA DC 3.5-24mA under/over-range capability.

    Output Accuracy: ±0.05%, typical. ±0.1%, maximum.

    Output Compliance
    Rload = (Vsupply – 7V) / 0.020A.
    Rload = 0 to 850 ohms @ 24V DC.

    Output Response Time (for step input change)

    Time to reach 98% of output value (typical)
    No filtering               34 milliseconds
    Low filter                  80 milliseconds
    Medium filter        214 milliseconds
    High filter            1238 milliseconds

    Output Ripple: Less than ±0.1% of output span.

    Environmental

    Operating Temperature

    Operation: -40 to 80°C (-40° to 176°F).

    Storage: -40 to 85°C (-40 to 185°F).

    Relative humidity: 5 to 95% non-condensing.

    Power Requirement: Loop-powered, 7-32V DC SELV, 24mA max.

    Isolation: 1500V AC peak. 250V AC (354V DC) continuous isolation between input and output circuits.

    Shock and Vibration Immunity
    Vibration: 4g, per IEC 60068-2-6.
    Shock: 25g, per IEC 60068-2-27.

    Approvals 
    CE compliant. Designed for UL/cUL Class I Division 2 Groups ABCD, ATEX / IECEx.

    Electromagnetic Compatibility (EMC) Compliance

    Radiated Emissions: BS EN 61000-6-4, CISPR 16.

    RFI: BS EN 61000-6-2, IEC 61000-4-3.

    Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.

    ESD: BS EN 61000-6-2, IEC 61000-4-2.

    EFT: BS EN 61000-6-2, IEC 61000-4-4.

    Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.

    Physical

    General: General-purpose enclosure designed for mounting on 35mm “T-type” DIN rail.

    Case Material: Self-extinguishing polyamide, UL94 V-0 rated.

    I/O Connectors: Removable plug-in terminal blocks rated for 12A/250V; AWG #26-12, stranded or solid copper wire.

    Dimensions: 17.5 x 114.5 x 99.0 mm (0.7 x 4.51 x 3.90 inches).

    Unit weight: 0.16 kg (0.35 pounds).

    Shipping Weight: 0.22 kg (0.5 pounds) packed.

  • Features & Benefits

    • Operate as a dual transmitter, a single transmitter, or a signal splitter
    • Easy configuration via USB with Windows software or Agility™ app for Android
    • Independently adjustable and scalable: input and output ranges
    • Selectable RTD and linear resistance input types: Pt 100/200/500Ω, Ni 120Ω, Cu 10Ω, 0-4500Ω
    • 4-20mA current loop outputs support sinking or sourcing circuit configurations
    • Supports reverse-acting (inverse) output
    • User-configurable output range clamp levels support NAMUR-compliant operation
    • Selectable up/downscale sensor break detection
    • Very low 7V two-wire loop burden
    • High accuracy, linearity, stability, and reliability
    • User-selectable filtering (none, low, med., high)
    • Space-saving 17.5mm (0.7 inch) unit with pluggable terminals for convenient wiring
    • 1500V isolation, 4-way (inputs/outputs)
    • Wide ambient operation (-40 to 80°C)
    • Approvals: CE compliant. UL/cUL Class I Div 2, ATEX/IECEx Zone 2

     

     

     

     

     

  • Tech Papers

    The Best Temperature Sensor for Process Control: Thermocouple vs RTD - 8500918 (Log in to view the file)
    Criteria for Temperature Selection of T/C and RTD Sensor Types This is part three of a comprehensive three-part series that provides information for choosing an industrial temperature sensor from Thermocouple (T/C) and Resistance Temperature Detector (RTD) sensor types. Thermocouple vs RTD Many users simply look to fill the basic needs of their application and do...
    How to use RTDs for Temperature Measurement - 8500917 (Log in to view the file)
    Criteria for Temperature Selection of T/C and RTD Sensor Types This is part two of a comprehensive three-part series that provides information for choosing an industrial temperature sensor from Thermocouple (T/C) and Resistance Temperature Detector (RTD) sensor types. The Basics of Temperature Measurement Using RTDs A Resistance Temperature Detector (RTD) is a passive circuit element...
  • Specs & Data Sheets

    Specifications

    Manuals

    DT235 User Manual (Log in to download the file)

  • Software

    TTC-SIP: Software Interface Package Information Page (Log in to download the file)
    DT230 and DT330 Configuration Software (Log in to download the file)
    Agility Config Tool (Tethered) (Log in to download the file)
  • Accessories

    • Compare

      4001-252: DIN Rail End Stops

      • DIN rail end stop for hazloc approvals
      Select options
    • Compare

      DT230-Config/Cal: Calibration Service

      • Factory custom configuration/calibration service.
      • Specify input type, input/output zero and full-scale values, filtering, and sensor fault settings on order.
      Select options
    • Compare

      USB Cables

      4001-112: USB cable, 1 meter, with Type A to Type B plugs. 4001-113: USB cable, 1 meter, with Type A to Mini-B plugs. 5028-565: USB-OTG cable, 6 inches
      Select options
  • Additional information

    Additional information

    Weight 8 oz
    Dimensions 1 × 5 × 4 in
    Part Number

    DT235-0600: Two-wire dual transmitter

    Configuration

    Agility Mobile App, Windows Software Configuration

    Product Series

    DT230 Series