TT233 Transmitter, Thermocouple / Millivolt Input, Loop-Powered by Acromag

Companies & Organizations:

United States of America

Acromag, Incorporated
30765 South Wixom Road
Wixom, Michigan 48393-2417 USA

- Universal TC type J, K, T, R, S, E, B, N or ±100mV input

- 4-20mA ouput (sink/source)

- 12-32 V DC loop/local power


The TT233 model is a space-saving two-wire transmitter that isolates and converts a millivolt or thermocouple sensor input to a proportional 4-20mA control signal. Power is received from the output loop current or a DC supply when using a three-wire connection. The transmitter performs thermocouple linearization, cold junction compensation, and lead-break detection.


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.


Agility™ Config Tool is available for free.


IMPORTANT: To prevent damage or errors from grounded PCs and surges, Acromag strongly recommends the use of their USB-ISOLATOR when configuring a TT230 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.

USB Cable Length: 5.0 meters maximum.

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




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

TC J input; -210 to 760°C (-346 to 1400°F) range; ±0.5°C.

TC K input; -200 to 1372°C (-328 to 2502°F) range; ±0.5°C.

TC T input; -260 to 400°C (-436 to 752°F) range; ±0.5°C.

TC R input; -50 to 1768°C (-58 to 3214°F) range; ±1.0°C.

TC S input; -50 to 1768°C (-58 to 3214°F) range; ±1.0°C.

TC E input; -200 to 1000°C (-328 to 1832°F) range; ±0.5°C.

TC B input; 260 to 1820°C (500 to 3308°F) range; ±1.0°C.

TC N input; -230 to 1300°C (-382 to 2372°F) range; ±1.0°C.

mV input; -100 to 100mV range; ±0.1mV.

Error includes the effects of repeatability, terminal point conformity, and linearization. Does not include CJC error.

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).

Zero Scaling Adjust: 0 to 95% of range, typical.

Full-Scale Adjust: 5 to 100% of full-scale range, typical.

Lead Break (Sensor Burnout) Detection: Configurable for either upscale (24mA) or downscale (3.3mA) operation.

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

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

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

Input Filter Bandwidth: Normal mode plus digital filtering within the ADC. Bandwidth (-3dB) varies with digital filter setting from 4Hz without filtering to 0.33Hz with high filtering.

Noise Rejection (Common Mode, High Filter): 155dB @ 60Hz, typical with 100 ohm input unbalance.




Output Range: 4 to 20mA DC.

Output Compliance: Rload = (Vsupply - 11V) / 0.020A. Rload = 0 to 650 ohms @ 24V DC.

Output Response Time (for step input change)

Time to reach 98% of final output value (typical)

No filtering; 104 milliseconds

Low filter; 380 milliseconds

Medium filter; 760 milliseconds

High filter; 960 milliseconds




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 max.

Isolation: 1500V AC peak. 250V AC (354V DC) continuous isolation between input and output circuits.

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

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.

Approvals: CE compliant. Designed for UL/cUL Class I Division 2 Groups ABCD, ATEX / IECEx Zone 2. II 3 G Ex nA IIC T4 Gc -40°C < Ta < +80°C.




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: 12.5 x 114.5 x 99.0 mm (0.5 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 with Windows configuration software

- Easy setup and digital calibration via USB with Windows configuration software

- Universal thermocouple or millivolt input (TC Type J, K, T, R, S, E, B, N or ±100mV)

- Space-saving 12.5mm (0.5 inch) unit with pluggable terminals for convenient wiring

- High accuracy, linearity, stability, and reliability

- Low temperature drift (<80ppm/°C)

- User-selectable filtering (none, low, med., high)

- Supports sink or source output wiring

- Supports reverse-acting (inverse) output

- Selectable upscale or downscale operation for sensor errors and lead-break detection

- 1500V input isolation

- NAMUR-compliant output loop current

- Shock (50g) and vibration (5g) resistant

- Mounts on Type T DIN-rail

- Wide ambient operation (-40 to 80°C)

- CE compliant. UL/cUL Class I Div 2, ATEX / IECEx Zone 2 approvals

Defense Products & Services: TT233 Transmitter, Thermocouple / Millivolt Input, Loop-Powered by Acromag
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Defense Products & Services Sectors: Computers components
Description: TT233 Transmitter, Thermocouple / Millivolt Input, Loop-Powered
Source of Information: Acromag Inc