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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.

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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.
II 3 G Ex nA IIC T4 Gc -40°C < Ta < +80°C.

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
Temperature Measurement Select the Best Temperature Sensor for Process Control Applications White Paper (Log in to view the file)
How to Select the Best Temperature Sensor for Process Control Applications White Paper Thermocouples versus Resistance Temperature Detectors Many users simply look to fill the basic needs of their application and do not worry much about their choice of temperature sensing technology. That is, they will make a selection based simply on temperature range and...
Temperature Measurement Using RTDs White Paper (Log in to view the file)
The Basics of Temperature Measurement Using RTDs Temperature reigns as the most often measured process parameter in industry. Most industrial applications require that a temperature be measured remotely, and that this signal be transmitted some distance. An industrial transmitter is commonly used to amplify, isolate, and convert the low-level sensor signal to a high level...
How to Monitor RTDs for Temperature Differential Application Note
Defining the Problem: 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
    $15$155
    Select options
  • Compare

    ST13C-SIP

    • Configuration software
    • USB isolator
    • Two USB cables
    • One kit recommended per customer
    $190
    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.
    $110
    Select options

Additional information

Weight 8 oz
Dimensions 2.4 × 1.85 × 0.925 in
Part Number

USB-Isolator: includes USB cable

  • Description

    This compact, industrial-grade isolator provides a high-voltage isolation barrier between a computer and a connected USB device.

    The isolation protects equipment from electrical surges and transient voltage spikes. It also eliminates ground loop currents flowing between the PC and peripherals which can cause damage and inaccurate measurements. Additionally, isolation minimizes conducted noise from static discharge, magnetic fields, and radio frequency interference.

    Acromag’s USB isolator is very easy to use. The isolator inserts in-line with the USB connection and operates transparently. No special software drivers are required. The unit receives power from the PC’s USB port and isolates that power to the connected device. High noise immunity and low radiated emissions ensure reliable data transfer in sensitive applications.

    A number of high-performance features help provide convenient and dependable operation. The green LED indicates that power is being received and blinks if the connected device draws too much current. An internal jumper lets you switch from Full Speed (12 Mbps) to Low Speed (1.5 Mbps) communication. The reset button offers a simple way to reinitialize a connected device without breaking the cable connection. High-retention USB sockets keep cables securely attached under shock and vibration.

  • 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

    Temperature Measurement Select the Best Temperature Sensor for Process Control Applications White Paper (Log in to view the file)
    How to Select the Best Temperature Sensor for Process Control Applications White Paper Thermocouples versus Resistance Temperature Detectors Many users simply look to fill the basic needs of their application and do not worry much about their choice of temperature sensing technology. That is, they will make a selection based simply on temperature range and...
    Temperature Measurement Using RTDs White Paper (Log in to view the file)
    The Basics of Temperature Measurement Using RTDs Temperature reigns as the most often measured process parameter in industry. Most industrial applications require that a temperature be measured remotely, and that this signal be transmitted some distance. An industrial transmitter is commonly used to amplify, isolate, and convert the low-level sensor signal to a high level...
    How to Monitor RTDs for Temperature Differential Application Note
    Defining the Problem: 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
      $15$155
      Select options
    • Compare

      ST13C-SIP

      • Configuration software
      • USB isolator
      • Two USB cables
      • One kit recommended per customer
      $190
      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.
      $110
      Select options
  • Additional information

    Additional information

    Weight 8 oz
    Dimensions 2.4 × 1.85 × 0.925 in
    Part Number

    USB-Isolator: includes USB cable