TT238
Transmitter, High Voltage Input, Loop-Powered
• Multi-range ±15V, ±75V or ±150V DC input
• 4-20mA ouput (sink/source)
• 12-32 V DC loop/local power
The TT238 model is a space-saving two-wire transmitter that isolates and converts a high level DC voltage input to a proportional 4-20mA control signal. A single unit supports multiple voltage input ranges for extra flexibility. Power is received from the output loop current or a local DC supply when using a three-wire connection.
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.
Description
Agility™ Config Tool is available for free.
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IMPORTANT: To prevent damage or errors from grounded PCs and surges, Acromag strongly recommends 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: ±150V, medium filtering.
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 Impedance: Greater than 1M ohms.
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 Filter: Selectable digital filtering settings (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) 130dB @ 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 final output value (typical) | |
| Low filter | 50 milliseconds |
| Medium filter | 150 milliseconds |
| High filter | 1200 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: 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
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.
Features & Benefits
Features
• Easy setup and digital calibration via USB with Windows configuration software
• Single unit supports ±15V, ±75V, and ±150V DC input ranges
• Space-saving 12.5mm (0.5 inch) unit with pluggable terminals for convenient wiring
• High accuracy, linearity, stability, and reliability
• User-selectable filtering (low, medium, 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
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