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Product short description:
  • 100 ohm Pt RTD or 0-900 ohm input
  • 4 to 20mA DC output
  • 9-32V DC from output loop power
  • USB-configured

The ST131 is a low-cost two-wire transmitter that converts a 100 ohm Platinum RTD sensor input to a proportional 4-20mA signal. Power is received from the output loop current.

 

 

ST131: RTD Input, Loop-Powered Transmitter Description

The ST131 is a low-cost two-wire transmitter that converts a 100 ohm Platinum RTD sensor input to a proportional 4-20mA signal. Power is received from the output loop current. The transmitter provides sensor excitation and includes linearization, lead-wire compensation, and lead-break detection functions. Setup and calibration are fast and easy with a convenient USB connection to your PC and Acromag’s Windows configuration software.

Advanced signal processing capabilities, variable range input, and convenient USB programming make this instrument a very versatile temperature transmitter for RTD and resistance elements. These transmitters are designed to 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.

ST131 Performance Specifications

IMPORTANT: To prevent damage or errors from grounded PCs and surges, Acromag strongly recommends use of the USB-ISOLATOR when configuring an ST130 transmitter.

USB Interface

USB Connector: USB Mini-B type socket, 5-pin.

USB Data Rate: 12Mbps. USB v1.1 and 2.0 compatible.

USB Transient Protection: Transient voltage suppression on power and data lines.

USB Cable Length: 5.0 meters maximum.

Driver: Not required. Uses built-in Human Interface Device (HID) USB drivers of the Windows operating system.

Input

Input Configuration: Two-, three- or four-wire sensor input connections.

Input Ranges
100 ohm Platinum RTD, alpha = 375-393,
385 (default), -50 to 900°C (-58 to 1652°F).

0 to 900 ohms linear resistance.

Programs in °C or ohmic integers only.

Zero Adjust
RTD 3/4 wire: -50, -17.78, or 0°C (-58, 0, 32°F).
RTD 2 wire: 0°C (32°F) fixed.
RES: 0 or 100 ohms.

Full-Scale Adjust
RTD: up to 900°C (1652°F), 50°C (58°F) span minimum.
Resistance: up to 900 ohms, 8 ohm span minimum.

Excitation Current: 0.5mA, nominal.

Lead-Wire Compensation: 25 ohms per lead.

Lead Break (Sensor Burnout) Detection: Configurable for either upscale or downscale.

Output

Output Range: 4 to 20mA DC.
Under-scale limit adjustable for 2.1 to 3.6mA, nominal.
Over-scale limit adjustable for 21 to 30mA, nominal.

Output Fault Limits (Sensor Fault): 0.4mA below selected under-scale threshold and 1.0mA above over-scale threshold, typical.

Output Compliance
Rload = (Vsupply – 9V) / 0.02A.
Rload = 0 to 750 ohms @ 24V DC.

Output Accuracy: Better than ±0.1% of span, typical for spans less than 500°C. Includes the effects of repeatability, terminal point conformity, and linearization, but does not include sensor error.

Ambient Temperature Effect: Better than ±0.010% per °C of input span or ±80ppm/°C, typical. Includes the combined effects of zero and span drift over temperature.

Output Response Time: 500µS, typical with 250 ohm load.

Environmental

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

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

Relative humidity: 5 to 95% non-condensing.

Power Requirement: 9-32V DC SELV (Safety Extra Low Voltage), 28mA max.

Isolation: Not isolated.

Shock and Vibration Immunity
Vibration: 5g, per IEC 60068-2-64.
Shock: 50g, per IEC 60068-2-27.

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

Radiated Field Immunity (RFI): BS EN 61000-6-2, IEC 61000-4-3.

Conducted RF Immunity (CRFI): BS EN 61000-6-2, IEC 61000-4-6.

Electrostatic Discharge (ESD): BS EN 61000-6-2, IEC 61000-4-2.

Electrical Fast Transient (EFT): BS EN 61000-6-2, IEC 61000-4-4.

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

Approvals
CE compliant. UL/cUL listings. ATEX Certified.
Designed for Class I; Division 2; Groups ABCD; Zone 2.

Physical

General: General purpose enclosure with potted circuit designed for mounting in DIN Form B connection heads.

DIN-Rail Mounting: Using optional ST130-DIN adapter, unit can mount to 35x15mm, T-type or G-type DIN rails.

Case Material: Self-extinguishing polycarbonate ABS plastic, UL94 V-0 rated base material. USB dust cap material is Santoprene, 251-70W232.

Printed Circuit Board: Military grade fire-retardant epoxy glass per IPC-4101/98 with humi-seal conformal coating.

I/O Connectors
Barrier strip type, captive screw terminals.
Wire range: AWG #14-28 solid or stranded.

Dimensions
Diameter = 44.5mm (1.752 inches),
Height = 23.4mm (0.921 inches).
Conforms to DIN 43 729 Form B size requirements.

Shipping Weight: 0.5 pounds (0.22 Kg) packed.

 

 

 

  • Easy setup and digital calibration via USB with Windows configuration software
  • Flexible RTD or linear resistance input ranges
  • High accuracy and linearity
  • Advanced analog signal conditioning ASIC eliminates digitization errors
  • Low temperature drift
  • Fast response time (< 500µS)
  • Programmable over/under-range limits
  • Selectable upscale or downscale operation for sensor errors and lead-break detection
  • NAMUR NE43 compliant fault response
  • Reverse polarity protected with non-polarized output
  • Mounts in DIN Form B sensor heads
  • Optional DIN rail adapter
  • Wide ambient operation (-40 to 80°C)
  • Hardened for harsh environments
  • CE compliant. UL/cUL Class 1 Div 2 Zone 2 approvals. Ex II 3 G Ex nA IIC T4 Gc -40°C Ta +80°C

 

 

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...
How to Monitor RTDs for Temperature Differential - 8401008
Defining the Need: Monitor three RTD’s on a stack and transmit two differential 4-20mA signals representing -7 to 18°F. Each RTD transmitter is calibrated -20 to 120°F. Solution: Model 892M-0500 math module (qty. 3) Model 800C-SIP software interface pkg. (qty. 1) Model PS5R-VD24 power supply (qty. 1)   Download PDF for complete application note.

Specifications

Manuals

ST131 User Manual (Log in to download the file)

ST131 Configuration Software (Log in to download the file)
  • Compare

    ST130 Mounting Accessories

    • Simplifies mounting of ST130 Series transmitters
    • Ideal for mounting in the field or in a control room
    Select options
  • Compare

    ST13C-SIP

    • Configuration software
    • USB isolator
    • Two USB cables
    • One kit recommended per customer
       
    Select options
  • Compare

    USB Isolator

    • USB-powered, USB 2.0 and 1.1 compatible
    • 1500V AC / 2100V DC isolation
    • No drivers required
    This compact, industrial-grade isolator provides a high-voltage isolation barrier between a computer and a connected USB device.    
    Select options

Additional information

Weight 16 oz
Dimensions 13 × 12 × 3 in
Part Number

ST131-0600: 100 ohm Pt RTD input, CE compliant, ST131-0610: 100 ohm Pt RTD input, CE compliant, plus UL/cUL Class 1 Div 2 Zone 2 approval and ATEX Certified.

Configuration

Factory Calibration, USB Configuration, Windows Software Configuration

Product Series

ST130 Series

  • Description

    ST131: RTD Input, Loop-Powered Transmitter Description

    The ST131 is a low-cost two-wire transmitter that converts a 100 ohm Platinum RTD sensor input to a proportional 4-20mA signal. Power is received from the output loop current. The transmitter provides sensor excitation and includes linearization, lead-wire compensation, and lead-break detection functions. Setup and calibration are fast and easy with a convenient USB connection to your PC and Acromag’s Windows configuration software.

    Advanced signal processing capabilities, variable range input, and convenient USB programming make this instrument a very versatile temperature transmitter for RTD and resistance elements. These transmitters are designed to 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.

    ST131 Performance Specifications

    IMPORTANT: To prevent damage or errors from grounded PCs and surges, Acromag strongly recommends use of the USB-ISOLATOR when configuring an ST130 transmitter.

    USB Interface

    USB Connector: USB Mini-B type socket, 5-pin.

    USB Data Rate: 12Mbps. USB v1.1 and 2.0 compatible.

    USB Transient Protection: Transient voltage suppression on power and data lines.

    USB Cable Length: 5.0 meters maximum.

    Driver: Not required. Uses built-in Human Interface Device (HID) USB drivers of the Windows operating system.

    Input

    Input Configuration: Two-, three- or four-wire sensor input connections.

    Input Ranges
    100 ohm Platinum RTD, alpha = 375-393,
    385 (default), -50 to 900°C (-58 to 1652°F).

    0 to 900 ohms linear resistance.

    Programs in °C or ohmic integers only.

    Zero Adjust
    RTD 3/4 wire: -50, -17.78, or 0°C (-58, 0, 32°F).
    RTD 2 wire: 0°C (32°F) fixed.
    RES: 0 or 100 ohms.

    Full-Scale Adjust
    RTD: up to 900°C (1652°F), 50°C (58°F) span minimum.
    Resistance: up to 900 ohms, 8 ohm span minimum.

    Excitation Current: 0.5mA, nominal.

    Lead-Wire Compensation: 25 ohms per lead.

    Lead Break (Sensor Burnout) Detection: Configurable for either upscale or downscale.

    Output

    Output Range: 4 to 20mA DC.
    Under-scale limit adjustable for 2.1 to 3.6mA, nominal.
    Over-scale limit adjustable for 21 to 30mA, nominal.

    Output Fault Limits (Sensor Fault): 0.4mA below selected under-scale threshold and 1.0mA above over-scale threshold, typical.

    Output Compliance
    Rload = (Vsupply – 9V) / 0.02A.
    Rload = 0 to 750 ohms @ 24V DC.

    Output Accuracy: Better than ±0.1% of span, typical for spans less than 500°C. Includes the effects of repeatability, terminal point conformity, and linearization, but does not include sensor error.

    Ambient Temperature Effect: Better than ±0.010% per °C of input span or ±80ppm/°C, typical. Includes the combined effects of zero and span drift over temperature.

    Output Response Time: 500µS, typical with 250 ohm load.

    Environmental

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

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

    Relative humidity: 5 to 95% non-condensing.

    Power Requirement: 9-32V DC SELV (Safety Extra Low Voltage), 28mA max.

    Isolation: Not isolated.

    Shock and Vibration Immunity
    Vibration: 5g, per IEC 60068-2-64.
    Shock: 50g, per IEC 60068-2-27.

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

    Radiated Field Immunity (RFI): BS EN 61000-6-2, IEC 61000-4-3.

    Conducted RF Immunity (CRFI): BS EN 61000-6-2, IEC 61000-4-6.

    Electrostatic Discharge (ESD): BS EN 61000-6-2, IEC 61000-4-2.

    Electrical Fast Transient (EFT): BS EN 61000-6-2, IEC 61000-4-4.

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

    Approvals
    CE compliant. UL/cUL listings. ATEX Certified.
    Designed for Class I; Division 2; Groups ABCD; Zone 2.

    Physical

    General: General purpose enclosure with potted circuit designed for mounting in DIN Form B connection heads.

    DIN-Rail Mounting: Using optional ST130-DIN adapter, unit can mount to 35x15mm, T-type or G-type DIN rails.

    Case Material: Self-extinguishing polycarbonate ABS plastic, UL94 V-0 rated base material. USB dust cap material is Santoprene, 251-70W232.

    Printed Circuit Board: Military grade fire-retardant epoxy glass per IPC-4101/98 with humi-seal conformal coating.

    I/O Connectors
    Barrier strip type, captive screw terminals.
    Wire range: AWG #14-28 solid or stranded.

    Dimensions
    Diameter = 44.5mm (1.752 inches),
    Height = 23.4mm (0.921 inches).
    Conforms to DIN 43 729 Form B size requirements.

    Shipping Weight: 0.5 pounds (0.22 Kg) packed.

     

     

     

  • Features & Benefits

    • Easy setup and digital calibration via USB with Windows configuration software
    • Flexible RTD or linear resistance input ranges
    • High accuracy and linearity
    • Advanced analog signal conditioning ASIC eliminates digitization errors
    • Low temperature drift
    • Fast response time (< 500µS)
    • Programmable over/under-range limits
    • Selectable upscale or downscale operation for sensor errors and lead-break detection
    • NAMUR NE43 compliant fault response
    • Reverse polarity protected with non-polarized output
    • Mounts in DIN Form B sensor heads
    • Optional DIN rail adapter
    • Wide ambient operation (-40 to 80°C)
    • Hardened for harsh environments
    • CE compliant. UL/cUL Class 1 Div 2 Zone 2 approvals. Ex II 3 G Ex nA IIC T4 Gc -40°C Ta +80°C

     

     

  • 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...
    How to Monitor RTDs for Temperature Differential - 8401008
    Defining the Need: Monitor three RTD’s on a stack and transmit two differential 4-20mA signals representing -7 to 18°F. Each RTD transmitter is calibrated -20 to 120°F. Solution: Model 892M-0500 math module (qty. 3) Model 800C-SIP software interface pkg. (qty. 1) Model PS5R-VD24 power supply (qty. 1)   Download PDF for complete application note.
  • Specs & Data Sheets

    Specifications

    Manuals

    ST131 User Manual (Log in to download the file)

  • Software

    ST131 Configuration Software (Log in to download the file)
  • Accessories

    • Compare

      ST130 Mounting Accessories

      • Simplifies mounting of ST130 Series transmitters
      • Ideal for mounting in the field or in a control room
      Select options
    • Compare

      ST13C-SIP

      • Configuration software
      • USB isolator
      • Two USB cables
      • One kit recommended per customer
         
      Select options
    • Compare

      USB Isolator

      • USB-powered, USB 2.0 and 1.1 compatible
      • 1500V AC / 2100V DC isolation
      • No drivers required
      This compact, industrial-grade isolator provides a high-voltage isolation barrier between a computer and a connected USB device.    
      Select options
  • Additional information

    Additional information

    Weight 16 oz
    Dimensions 13 × 12 × 3 in
    Part Number

    ST131-0600: 100 ohm Pt RTD input, CE compliant, ST131-0610: 100 ohm Pt RTD input, CE compliant, plus UL/cUL Class 1 Div 2 Zone 2 approval and ATEX Certified.

    Configuration

    Factory Calibration, USB Configuration, Windows Software Configuration

    Product Series

    ST130 Series