DT237: Medium DC voltage input two-wire dual transmitter
• Dual channels
• 0-10V, ±10V inputs
• 4-20mA outputs (sink/source)
• 7-32V DC loop power
DT230 series signal conditioners provide two independent I/O channels in a single, space-saving unit. The DT237 model is a two-wire dual transmitter that isolates and converts high-level DC voltage inputs 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.more >
High-voltage isolation separates all input and output circuits 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.
IMPORTANT: To prevent ground loop error between a grounded PC and a grounded input signal, Acromag strongly recommends use of a USB isolator like Acromag’s USB-Isolator when configuring a DT230 Series transmitter.
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)
Input: ±10V, medium filter.
Output: 4 to 20mA.
A/D Converters (ADC): Two 24-bit Sigma Delta ADCs (only 16-bits used).
Path A: ±1V, 0-1V.
Path B: ±5V, ±10V, 0-5V, 0-10V DC.
Ambient Temperature Effect: Better than ±80ppm/°C (±0.008%/°C).
Scaling Adjust: Full range.
Path A: 15MΩ
Path B: 1MΩ.
Input Over-Voltage Protection: Bipolar Transient Voltage Suppression (TVS) and diode clamping.
Input Filter: RC filter plus variable digital filter (none, low, medium, high).
Input Bandwidth: -3dB @ 16Hz (no filtering).
Noise Rejection (@ 60Hz, no filter):
Common Mode: 71dB no filter (119dB high filter).
Normal Mode: Path A 7dB, Path B 28dB no filter (>80dB high filter).
Output (two channels)
D/A Converters (DAC): Two 16-bit D/A converters.
Output Ranges: 4-20mA DC. 3.5-24mA under/over-range capability.
Output Accuracy: ±0.05%, typical. ±0.1%, maximum.
Rload = (Vsupply - 7V) / 0.020A
Rload = 0 to 850 ohms @ 24V DC
Output Response Time (for step input change):
|Time to reach 98% of output value (typical):|
|No filter||136 milliseconds|
|Low filter||147 milliseconds|
|Medium filter||317 milliseconds|
|High filter||1109 milliseconds|
Output Ripple: Less than ±0.1% of output span.
Operation: -40 to 80°C (-40° to 176°F).
Storage: -40 to 85°C (-40 to 185°F).
Relative humidity: 5 to 95% non-condensing.
Power Requirement: Loop-powered, 7-32V DC SELV, 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.
Approvals (all pending): CE compliant. Designed for UL/cUL Class I Division 2 Groups ABCD, ATEX/IECEx Zone 2.
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.
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.
Features & Benefits
- Operate as a dual transmitter, a single transmitter, or a signal splitter
- Easy configuration via USB with Windows software or Agility™ app for Android
- Independently adjustable and scalable: input and output ranges
- Selectable voltage input ranges: ±1V, ±5V, ±10V, 0-1V, 0-5V, 0-10V DC
- 4-20mA current loop outputs support sinking or sourcing circuit configurations
- Supports reverse-acting (inverse) output
- User-configurable output range clamp levels support NAMUR-compliant operation
- Very low 7V two-wire loop burden
- High accuracy, linearity, stability, and reliability
- User-selectable filtering (none, low, med, high)
- Space-saving 17.5mm (0.7 inch) unit with pluggable terminals for convenient wiring
- 1500V isolation, 4-way (inputs/outputs)
- Wide ambient operation (-40 to 80°C)
- Pending approvals: CE compliant. UL/cUL Class I Div 2, ATEX/IECEx Zone 2.