TT338: High Voltage Input, DC Power Transmitter

The TT338 model is a space-saving four-wire transmitter that isolates and converts a high level DC voltage 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 or the Agility™ Config Tool is a mobile application that allows easy setup and configuration of Acromag TT Series transmitters via a tethered mobile device.

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
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: ±150V, medium filter
Output: 4 to 20mA

Input Ranges and Accuracy:
Range                   Accuracy
±15V DC            ±0.05% of span
±75V DC            ±0.05% of span
±150V DC         ±0.05% of span
Error includes the effects of repeatability, terminal point conformity, and linearization.

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
Input Over-Voltage Protection: Bipolar Transient Voltage Suppressers (TVS), 220V working typical
Input Resolution:
Bipolar input: 1 part in 50000 (±25000)
Unipolar input: 1 part in 25000
Input Impedance: Greater than 1M ohms
Input Filter: Selectable digital filtering settings (none, low, medium, high)
Noise Rejection:
Normal mode @ 60Hz: >15dB (no filter), >80dB (high filter)
Common mode @ 60Hz: >70B (no filter), >120dB (high filter)

Output

Output Range:
Range                    Over-Range                 Resolution
±10V                            ±10.5V                       1 part in 62415
±5V                               ±5.V                            1 part in 31208
0 to 10V              –0.5527 to +10.5V        1 part in 59293
0 to 5V              –0.27634 to +5.25V        1 part in 59293
±20mA                        ±21mA                      1 part in 62415
0 to 20mA          –1.1054 to 21mA          1 part in 59293
4 to 20mA          –1.1054 to 21mA          1 part in 47434

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)
                                         TB1 (±15V)           TB2 (±75V,±150V)
No filter                    49 milliseconds           49 milliseconds
Low filter                 69 milliseconds           68 milliseconds
Medium filter      175 milliseconds         152 milliseconds
High filter           1164 milliseconds        944 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), 1.3W 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