TT233: Thermocouple / milliVolt Input Two-Wire Transmitter

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.

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 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

Input

Default Configuration/Calibration:
Input: TC J, -210 to 760°C, high 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

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
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

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 output value (typical)
No filtering             104 milliseconds
Low filter                 380 milliseconds
Medium filter         760 milliseconds
High filter                960 milliseconds

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 max
Isolation: 1500V AC peak. 250V AC (354V DC) continuous isolation between input and output circuits
Shock and Vibration Immunity:
Vibration: 4g, per IEC 60068-2-6
Shock: 25g, 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

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: 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

Additional information