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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.

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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 (pending)
CE compliant. UL/cUL listed Class I Division 2 Groups ABCD. ATEX, IECEx certified Zone 2.
II 3 G Ex nA IIC T4 Gc -40°C < Ta < +80°C.

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 (pending)
WHITEPAPER: Introduction to Strain and Strain Measurement (Log in to view the file)

Manuals

TT351 User Manual (Log in to download the file)

Agility Config Tool (Tethered) (Log in to download the file)
TT351 Series Configuration Software - 9500528 (Log in to download the file)
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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 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 (pending)
  • Tech Papers

    WHITEPAPER: Introduction to Strain and Strain Measurement (Log in to view the file)
  • Specs & Data Sheets

    Manuals

    TT351 User Manual (Log in to download the file)

  • Software

    Agility Config Tool (Tethered) (Log in to download the file)
    TT351 Series Configuration Software - 9500528 (Log in to download the file)
  • Accessories

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      • 10W, 15W, 30W, 60W, 90W, 120W, and 240W models
      • Universal Input (85-264V AC / 100-370V DC)
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      $95$245
      Select options
    • Compare

      TTBus-Kit: DIN Rail Bus Power Connector

      • One kit supports multiple SP Series Splitters or DT and TT Series transmitters.
      $25
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      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 below
      $40$160
      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.
      $99
      Select options
  • Additional information

    Additional information

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

    USB-Isolator: includes USB cable