DT333: Thermocouple / milliVolt Input Four-Wire Dual Transmitter

DT330 series signal conditioners provide two independent I/O channels in a single, space-saving unit. The DT333 model is a four-wire dual transmitter that isolates and converts millivolt or thermocouple sensor inputs to proportional control signals. Each channel supports DC current or voltage output. An optional DIN rail bus can deliver primary or redundant power to multiple units.

High-voltage isolation separates inputs, outputs, and power from each other. 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. The Android app enables setup with mobile devices.

Advanced signal processing capabilities, variable range input/output, and convenient USB programming make this instrument very versatile. 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 a USB isolator like Acromag’s USB-Isolator when configuring a DT330 Series transmitter.

USB Interface

USB Connection
Type: USB Mini-B type socket, 5-pin
Data Rate: 12Mbps. USB v1.1 and 2.0 compatible
Maximum cable length: 5.0 meters
Transient voltage suppression on power and data lines.

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

Input (two channels)

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

Input Ranges
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 -170°C (-382 to -274°F)              ±1.0°C
TC N        -230 to -1300°C (-274 to 2372°F            ±0.5°C
mV           -100 to 100mV                                             ±0.05%

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: Full range.

Lead Break (Sensor Burnout) Detection: Upscale/downscale full range.

Input Impedance: 15M ohms.

Input Over-Voltage Protection: Bipolar Transient Voltage Suppression (TVS) and diode clamping.

Input Filter: RC filter plus variable digital filter (none, low, medium, high).

Noise Rejection
Common Mode: 96dB no filter (134dB high filter).
Normal Mode: 0.12dB no filter, 60Hz (>80dB med/high filter).

Output (two channels)

D/A Converters (DAC): Two 16-bit D/A converters.

Output Ranges
±10V (±11V maximum).
±5V (±5.5V maximum).
0 to 10V (11V maximum).
0 to 5V (5.5V maximum).
0 to 20mA (24mA maximum).
4 to 20mA (24mA maximum).

Output Accuracy: ±0.05%, typical. ±0.1%, maximum.

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

Output Compliance: 11V, typical.

Output Response Time (for step input change)

Time to reach 98% of output value (typical)
No filtering               13 milliseconds
Low filter                   38 milliseconds
Medium filter        122 milliseconds
High filter             1158 milliseconds

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

Environmental

Operating Temperature
Operation: -40 to 70°C (-40° to 158°F)
Storage: -40 to 85°C (-40 to 185°F)
Relative humidity: 5 to 95% non-condensing

Power Requirement: 6-32V DC SELV, 1.6W max.

Isolation: 1500V AC peak. 250V AC (354V DC) continuous isolation between inputs, outputs, and power (5-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 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.

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).

Unit weight: 0.16 kg (0.35 pounds).

Shipping Weight: 0.22 kg (0.5 pounds) packed.

Additional information