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Product short description:
  • Strain gauge/load cell input
  • Universal current/voltage output
  • 9-32V DC local/bus power

The TT351 model is a space-saving four-wire transmitter that converts a four or six wire strain gauge bridge or load cell or milliVolt sensor signal to an isolated voltage or current output signal.

Click here to watch a short AcroMaggie video highlighting the TT351 features.

 

 

TT351: Strain Gauge Input Four-Wire Transmitter Description

The TT351 model is a space-saving four-wire transmitter that converts a four or six wire strain gauge bridge or load cell or milliVolt sensor signal to an isolated voltage or current output signal. An optional DIN rail bus can deliver primary or redundant power to multiple units.

Setup and calibration are fast and easy with a convenient USB connection to your PC and Acromag’s Windows configuration software.

The transmitter’s input circuit allows true 6-wire bridge measurement and includes an adjustable bridge excitation supply (4 to 11V DC) with a remote sense feature. Sense wires ensure the programmed excitation voltage is measured at the sensor and enable lead-wire compensation. The differential input performs true ratiometric conversions for extremely stable measurements that remain accurate over time and temperature.

Advanced signal processing capabilities, variable range input, and convenient USB programming make this instrument a very versatile strain/load measurement device. 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 damage or errors from grounded PCs and surges, Acromag strongly recommends use of their USB-ISOLATOR when configuring a TT350 Series transmitter.

USB Interface

USB Connector:
Type: USB Mini-B type socket, 5-pin.
Data rate: 12Mbps. USB v1.1 and 2.0 compatible.
Maximum cable length: 5.0 meters.

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

Driver: Not required. Uses Windows HID drivers.

General Input

Analog to Digital Converter (ADC): 24-bit S-D A/D converter.

Resolution: Varies from 13.5 to 20.5 bits per filter and gain selection.

Input Reference Test Conditions: Strain gauge/mV; Excitation = 10V; Rated Output = 1mV/V; Range = ±10mV; Ambient Temperature = 25°C; Power Supply = 24V DC.

Accuracy (overall input to output): Better than ±0.1% of span, typical. This value does not include sensor errors.

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

Noise Rejection:
Normal mode @ 60Hz: -19dB (no filter), -34dB (low filter), >80dB (med/high filter).
Common mode @ 60Hz: -136dB, typical with 100 ohm input unbalance.

Input Overvoltage Protection: Bipolar Transient Voltage Suppressors (TVS).

Bridge Input

Input Types: Select from basic load cell, two quarter-bridge options, two half-bridge options, three full-bridge options, or milliVolts.

Input Span/Range: Bipolar input range is determined from the ± product of the gauge’s rated output and the nominal excitation selection (2mV/V x 10V = ±20mV range).

Input Over-range: The actual input range is up to (user-specified) ±150% of the range obtained via the ± product of the gauge’s rated output and the nominal excitation applied.

Input Sensitivity: Accepts gauge rated outputs up to 1mV/V to 10mV/V. The range of your input signal is the ± product of the excitation voltage and your gauge’s rated output.

Input Impedance: ±IN at 15M ohms, ±SEN at 73.2K ohms, typical

Input Lead Resistance:
Module has sufficient overdrive to guarantee 10V bridge excitation with 5 ohms/lead and 100mA of internal excitation current.
Larger lead resistances may limit the maximum achievable internal bridge excitation.

Input Bridge Excitation (Internal)
Adjustable from 4V to 11V, 120mA maximum. Internal excitation must be turned OFF before external excitation supply connection.

Input Bridge Excitation (External)
4V to 11V. The internal excitation must be turned OFF for connection to an external excitation supply.

Digital (Trigger) Input

Input Type: “Active High” input, 100ms minimum.

15-30V DC (6.65K ohms) See connection diagram.

Operation (Tare/Alarm Modes): The trigger function is set for “Auto-Tare” mode by default.

Output (DC V/mA)

D/A Converter: 16-bit

Current Output
Ranges: 0-20mA, 4-20mA
Compliance: 10V minimum (525 ohm load)

Voltage Output
Ranges: 0-5V, ±5V, 0-10V, ±10V
Compliance: 10mA maximum with short circuit protection. 1 ohm output impedance

Output Response Time to 98% (for step input change)
No filter: 264ms. Medium filter: 472ms
Low filter: 292ms. High filter: 2547ms

Environmental

Operating Temperature: -40 to 70°C (-40° to 158°F)

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

Relative humidity: 5 to 95% non-condensing

Power Requirement:

Supply |    Ptot   | Current Draw
9V         | 3.05W | 339mA Max.
12V       | 3.05W | 254mA Max.
15V       | 3.05W | 203mA Max.
24V      | 3.05W | 127mA Max.
32V      | 3.05W | 95mA Max.

Isolation: 4-way (input/output/trigger/power). Input/excitation, analog output, trigger, and power circuits are isolated from each other for up to 1500V AC for 60 seconds or 250V AC continuous.

Shock and Vibration Immunity:
Vibration: 4g
Shock: 25g

Approvals:
CE compliant. UL/cUL listed Class I Division 2 Groups ABCD. ATEX, IECEx certified Zone 2.

Physical

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

Case Material: Self-extinguishing polyamide, UL94 V-0 rated, color light gray. General-purpose NEMA Type 1 enclosure

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)

Shipping Weight: 0.22 kg (0.5 pounds) packed

 

 

  • Easy setup and digital calibration via USB withWindows® configuration software or AgilityTM appfor Android® devices
  • Flexible SG Bridge, Load Cell, or mV Input
  • Digitally Adjustable Sensor Excitation
  • Space-saving 17.5mm (0.7 inch) unit withpluggable terminals for convenient wiring
  • High accuracy, linearity, stability, and reliability
  • Remote Sense and measurement of BridgeExcitation Vex
  • Ratio-Metric Input Measurement of Sensor Vo
  • Optional Automatic Null-Compensation/Zero-Balance of Bridge Output Vo
  • User-specified input over-range limiting
  • Bus power, local power, or both
  • Redundant power ready (rail/local)
  • Separate voltage & current output terminals
  • Shock (25g) and vibration (4g) resistant
  • Wide ambient operation (-40 to 70°C)
  • CE compliant. UL/cUL Class I Div 2,ATEX/IECEx Zone 2 approvals

 

 

Introduction to Strain Gauge Transmitters & Strain Measurement | Whitepaper (Log in to view the file)
Introduction to Strain Gauge & Strain Measurement This paper discusses strain gauge and load cell input transmitters and strain and load measurement, as related to Acromag strain modules and transmitters in particular. However, the principles may be extended to other strain gauge or load cell instruments as well. Strain gauges change resistance in proportion to...

Specifications

Manuals

TT351 User Manual (Log in to download the file)

Agility Config Tool (Tethered) (Log in to download the file)
TT300 Series Windows Configuration Software (Log in to download the file)
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Additional information

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

TT351-0700: Bridge input. CE, cULus, TT351-0710: Bridge input. CE, UL C1D2, ATEX/IECEx Zone 2

Product Series

TT350 Series

Power

DC Power

Configuration

Agility Mobile App, USB Configuration, Windows Software Configuration

  • Description

    TT351: Strain Gauge Input Four-Wire Transmitter Description

    The TT351 model is a space-saving four-wire transmitter that converts a four or six wire strain gauge bridge or load cell or milliVolt sensor signal to an isolated voltage or current output signal. An optional DIN rail bus can deliver primary or redundant power to multiple units.

    Setup and calibration are fast and easy with a convenient USB connection to your PC and Acromag’s Windows configuration software.

    The transmitter’s input circuit allows true 6-wire bridge measurement and includes an adjustable bridge excitation supply (4 to 11V DC) with a remote sense feature. Sense wires ensure the programmed excitation voltage is measured at the sensor and enable lead-wire compensation. The differential input performs true ratiometric conversions for extremely stable measurements that remain accurate over time and temperature.

    Advanced signal processing capabilities, variable range input, and convenient USB programming make this instrument a very versatile strain/load measurement device. 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 damage or errors from grounded PCs and surges, Acromag strongly recommends use of their USB-ISOLATOR when configuring a TT350 Series transmitter.

    USB Interface

    USB Connector:
    Type: USB Mini-B type socket, 5-pin.
    Data rate: 12Mbps. USB v1.1 and 2.0 compatible.
    Maximum cable length: 5.0 meters.

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

    Driver: Not required. Uses Windows HID drivers.

    General Input

    Analog to Digital Converter (ADC): 24-bit S-D A/D converter.

    Resolution: Varies from 13.5 to 20.5 bits per filter and gain selection.

    Input Reference Test Conditions: Strain gauge/mV; Excitation = 10V; Rated Output = 1mV/V; Range = ±10mV; Ambient Temperature = 25°C; Power Supply = 24V DC.

    Accuracy (overall input to output): Better than ±0.1% of span, typical. This value does not include sensor errors.

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

    Noise Rejection:
    Normal mode @ 60Hz: -19dB (no filter), -34dB (low filter), >80dB (med/high filter).
    Common mode @ 60Hz: -136dB, typical with 100 ohm input unbalance.

    Input Overvoltage Protection: Bipolar Transient Voltage Suppressors (TVS).

    Bridge Input

    Input Types: Select from basic load cell, two quarter-bridge options, two half-bridge options, three full-bridge options, or milliVolts.

    Input Span/Range: Bipolar input range is determined from the ± product of the gauge’s rated output and the nominal excitation selection (2mV/V x 10V = ±20mV range).

    Input Over-range: The actual input range is up to (user-specified) ±150% of the range obtained via the ± product of the gauge’s rated output and the nominal excitation applied.

    Input Sensitivity: Accepts gauge rated outputs up to 1mV/V to 10mV/V. The range of your input signal is the ± product of the excitation voltage and your gauge’s rated output.

    Input Impedance: ±IN at 15M ohms, ±SEN at 73.2K ohms, typical

    Input Lead Resistance:
    Module has sufficient overdrive to guarantee 10V bridge excitation with 5 ohms/lead and 100mA of internal excitation current.
    Larger lead resistances may limit the maximum achievable internal bridge excitation.

    Input Bridge Excitation (Internal)
    Adjustable from 4V to 11V, 120mA maximum. Internal excitation must be turned OFF before external excitation supply connection.

    Input Bridge Excitation (External)
    4V to 11V. The internal excitation must be turned OFF for connection to an external excitation supply.

    Digital (Trigger) Input

    Input Type: “Active High” input, 100ms minimum.

    15-30V DC (6.65K ohms) See connection diagram.

    Operation (Tare/Alarm Modes): The trigger function is set for “Auto-Tare” mode by default.

    Output (DC V/mA)

    D/A Converter: 16-bit

    Current Output
    Ranges: 0-20mA, 4-20mA
    Compliance: 10V minimum (525 ohm load)

    Voltage Output
    Ranges: 0-5V, ±5V, 0-10V, ±10V
    Compliance: 10mA maximum with short circuit protection. 1 ohm output impedance

    Output Response Time to 98% (for step input change)
    No filter: 264ms. Medium filter: 472ms
    Low filter: 292ms. High filter: 2547ms

    Environmental

    Operating Temperature: -40 to 70°C (-40° to 158°F)

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

    Relative humidity: 5 to 95% non-condensing

    Power Requirement:

    Supply |    Ptot   | Current Draw
    9V         | 3.05W | 339mA Max.
    12V       | 3.05W | 254mA Max.
    15V       | 3.05W | 203mA Max.
    24V      | 3.05W | 127mA Max.
    32V      | 3.05W | 95mA Max.

    Isolation: 4-way (input/output/trigger/power). Input/excitation, analog output, trigger, and power circuits are isolated from each other for up to 1500V AC for 60 seconds or 250V AC continuous.

    Shock and Vibration Immunity:
    Vibration: 4g
    Shock: 25g

    Approvals:
    CE compliant. UL/cUL listed Class I Division 2 Groups ABCD. ATEX, IECEx certified Zone 2.

    Physical

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

    Case Material: Self-extinguishing polyamide, UL94 V-0 rated, color light gray. General-purpose NEMA Type 1 enclosure

    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)

    Shipping Weight: 0.22 kg (0.5 pounds) packed

     

     

  • Features & Benefits

    • Easy setup and digital calibration via USB withWindows® configuration software or AgilityTM appfor Android® devices
    • Flexible SG Bridge, Load Cell, or mV Input
    • Digitally Adjustable Sensor Excitation
    • Space-saving 17.5mm (0.7 inch) unit withpluggable terminals for convenient wiring
    • High accuracy, linearity, stability, and reliability
    • Remote Sense and measurement of BridgeExcitation Vex
    • Ratio-Metric Input Measurement of Sensor Vo
    • Optional Automatic Null-Compensation/Zero-Balance of Bridge Output Vo
    • User-specified input over-range limiting
    • Bus power, local power, or both
    • Redundant power ready (rail/local)
    • Separate voltage & current output terminals
    • Shock (25g) and vibration (4g) resistant
    • Wide ambient operation (-40 to 70°C)
    • CE compliant. UL/cUL Class I Div 2,ATEX/IECEx Zone 2 approvals

     

     

  • Tech Papers

    Introduction to Strain Gauge Transmitters & Strain Measurement | Whitepaper (Log in to view the file)
    Introduction to Strain Gauge & Strain Measurement This paper discusses strain gauge and load cell input transmitters and strain and load measurement, as related to Acromag strain modules and transmitters in particular. However, the principles may be extended to other strain gauge or load cell instruments as well. Strain gauges change resistance in proportion to...
  • Specs & Data Sheets

    Specifications

    Manuals

    TT351 User Manual (Log in to download the file)

  • Software

    Agility Config Tool (Tethered) (Log in to download the file)
    TT300 Series Windows Configuration Software (Log in to download the file)
  • Accessories

    • Compare

      PS5R: Slim Line Power Supplies

      • 10W, 15W, 30W, 60W, 90W, 120W, and 240W models
      • Universal Input (85-264V AC / 100-370V DC)
      • Lightweight and compact size
       
      $100$255
      Select options
    • Compare

      TTBus-Kit: DIN Rail Bus Power Connector

      • One kit supports multiple TT330 series transmitters.
      • For multiple DT330/351 or SP330 transmitters, one TTBUS-KIT is required for each transmitter to be DC Power wired via the bus rail power connections.
         
      $35
      Select options
    • Compare

      TTC-SIP: Software

      • Software Interface Package for Acromag DT, ST, TT Series Transmitters and SP, uBSP Series Signal Splitters.
      • Includes configuration sofware CD-ROM (5040-xxx), isolator (USB-ISOLATOR) and two USB cable (4001-112, 4001-113) (Recommend one kit per customer.)
      • Easy setup and digital calibration via USB with Windows configuration software.
      • Download the configuration software only - from the Software Tab
      $180
      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 1 × .5 × 4 in
    Part Number

    TT351-0700: Bridge input. CE, cULus, TT351-0710: Bridge input. CE, UL C1D2, ATEX/IECEx Zone 2

    Product Series

    TT350 Series

    Power

    DC Power

    Configuration

    Agility Mobile App, USB Configuration, Windows Software Configuration