TT333: Thermocouple / milliVolt Input Four-wire Transmitter

The TT333 model is a space-saving four-wire transmitter that isolates and converts a millivolt or thermocouple sensor input to a proportional control signal. DC current and voltage output are both supported on a single model. An optional DIN rail bus can deliver primary or redundant power to multiple units without wiring.

High-voltage isolation separates the input from the output circuit. 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.

Advanced signal processing capabilities, variable range input, and convenient USB programming make this instrument a very versatile temperature 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 the use of their USB-ISOLATOR when configuring a TT330 Series 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
Maximum Cable Length: 5.0 meters
Driver: Not required. Uses Windows HID drivers

Input

Default Configuration/Calibration:
Input: TC J, -210 to 760°C, medium filter, Break: up
Output: 4 to 20mA

Input Ranges and Accuracy
Input                         Range                                     Accuracy
TC J         -210 to 760°C (-346 to 1400°F)             ±0.5°C
TC K        -200 to 1372°C (-328 to 2502°F)           ±0.5°C
TC T        -260 to 400°C (-436 to 752°F)                ±0.5°C
TC R          -50 to 1768°C (-58 to 3214°F)              ±1.0°C
TC S          -50 to 1768°C (-58 to 3214°F)              ±1.0°C
TC E        -200 to 1000°C (-328 to 1832°F)           ±0.5°C
TC B        260 to 1820°C (500 to 3308°F)              ±1.0°C
TC N       -230 to -1300°C (-274 to 2372°F            ±1.0°C
mV          -100 to 100mV                                             ±0.1mV
Error includes the effects of repeatability, terminal point conformity, and linearization.

Thermocouple Reference (Cold Junction Compensation): ±0.2°C typical, ±0.5°C maximum at 25°C.

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

Scaling Adjust:
Zero: 0 to 95% of range, typical.
Full Scale: 5 to 100% of full scale range, typical.

Lead Break (Sensor Burnout) Detection: Upscale/downscale ±5% full scale range typical.

Input Over-Voltage Protection: Bipolar Transient Voltage Suppressers (TVS), 5.6V clamp level typical.

Input Resolution
Millivolt input: 0.0025% (1 part in 40,000).
Thermocouple input: 0.1°C.

Input Impedance
Current input: 24.9 ohms.
Voltage input: 15M ohms.

Input Filter: Selectable digital filtering settings (none, low, medium, high).

Noise Rejection (Common Mode, High Filter)
Normal mode @ 60Hz: >0.5dB (no filter), >80dB (high filter).
Common mode @ 60Hz: >100dB (no filter), >130dB (high filter).

Output

Output Range:
Range                    Over-Range                 Resolution
±10V                            ±10.5V                       1 part in 62415
±5V                               ±5.25V                      1 part in 31208
0 to 10V              –0.5527 to +10.5V        1 part in 59240
0 to 5V              –0.27634 to +5.25V        1 part in 60262
±20mA                        ±10.5V                      1 part in 62259
0 to 20mA          –1.1054 to 21mA         1 part in 58596
4 to 20mA          –1.1054 to 21mA         1 part in 46877

Output Load
Voltage output: 1K ohms minimum.
Current output: 0-550 ohms.

Output Response Time (for step input change)

Time to reach 98% of output value (typical)
No filter                   15 milliseconds
Low filter                40 milliseconds
Medium filter      120 milliseconds
High filter             850 milliseconds

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

Output Ambient Temperature Drift: Better than ±80ppm/°C (±0.0080%/°C.

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: 12-32V DC SELV (Safety Extra Low Voltage), 24mA maximum.

Isolation: 1500V AC peak. 250V AC (354V DC) continuous isolation between input, output, and power (3-way).

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 certified Zone 2. II 3 G Ex nA IIC T4 Gc -40°C < Ta < +80°C.

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, 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.