SP238: High Voltage Input Signal Splitter, Two-Wire
• Multi-range ±15V, ±75V, or ±150V input
• 4-20mA outputs (sink/source)
• 7-32V DC loop/local power
The SP238 model is a high-performance signal splitter that converts one high-level DC voltage input into two proportional isolated 4-20mA control signals. power is received from one or both output loop currents.
Setup is fast and easy with a USB connection to your PC and our Windows software. Acromag’s Agility™ mobile app enables configuration on an Android smartphone or tablet. Software simplifies I/O range scaling, calibration, and advanced signal processing capabilities.
High-voltage isolation separates the input and between the output circuits. The isolation protects from surges, reduces noise, and eliminates ground loop errors.
These rugged instruments withstand harsh industrial environments to operate reliably across a wide temperature range with very low drift. They feature high immunity to RFI, EMI, ESD, and EFT, plus low radiated emissions.
Agility™ Config Tool is available for free.
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: ±150V, medium filtering.
Output: 4 to 20mA.
Input Ranges and Accuracy
|±15V DC||±0.05% of span|
|0-15V DC||±0.05% of span|
|±150V / ±75 DC||±0.05% of span|
|0-150V||±0.05% of span|
|0-5V 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 Suppressors (TVS), 220V working typical.
Bipolar input: 1 part in 50000 (±25000).
Unipolar input: 1 part in 25000.
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): 138dB @ 60Hz, typical with 100 ohm input unbalance.
Output (Two Signals, Passive)
Output Range: 4 to 20mA DC.
Rload = (Vsupply - 7V) / 0.020A.
Rload = 0 to 850 ohms @ 24V DC.
Output Response Time (for step input change)
|Time to reach 98% of final output value (typical)|
|No filter||88 milliseconds|
|Low filter||100 milliseconds|
|Medium filter||237 milliseconds|
|High filter||1762 milliseconds|
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: 7-32V 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 60068-2-64.
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. ATEX II 3 G Ex nA IIC T4 Gc -40°C < Ta < +80°C
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 (0.69 x 4.51 x 3.90 inches).
Shipping Weight: 0.22 kg (0.5 pounds) packed.
Features & Benefits
• Easy configuration via USB with Windows software or Agility app for Android
• Single unit accepts ±15V, ±75V, and ±150V DC input ranges
• Input scales independently at each output
• User-selectable filtering (none, low, med, high)
• User-configurable output range clamp levels support NAMUR-compliant operation
• Supports reverse-acting (inverse) output
• Supports sink or source output wiring
• Very low 7V two-wire loop burden
• High accuracy, linearity, stability, and reliability
• 1500V isolation
• Space-saving 17.5mm (0.69 inch) design with pluggable terminals for easier wiring
• Shock (25g) and vibration (4g) resistant
• Wide ambient operation (-40 to 80°C)
• CE compliant. UL/cUL Class I Div 2, ATEX / IECEx Zone 2 approvals