The SP233 model is a high-performance signal splitter that converts one millivolt or thermocouple sensor 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 smart phone 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.

Performance Specifications

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 SP230 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 (Passive)

Default Configuration/Calibration: Input: TC J, -210 to 760°C, high filter, Break: up Output: 4 to 20mA Input Ranges and Accuracy: 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 1300°C (-382 to 2372°F)          ±1.0°C mV           -100 to 100mV                                           ±0.1mV *Error includes the effects of repeatability, terminal point conformity, and linearization. Does not include CJC error. 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) Zero Scaling Adjust: 0 to 95% of range, typical Full Scale Adjust: 5 to 100% of full scale range, typical Lead Break (Sensor Burnout) Detection: Configurable for either upscale (24mA) or downscale (3.3mA) operation. Input Over-Voltage Protection: Bipolar Transient Voltage Suppressers (TVS), 5.6V clamp level typical. Resolution: milliVolt input: 0.0025% (1 part in 40,000) Thermocouple input: 0.1°C 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 Output Compliance: 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 filtering:         21 milliseconds Low filter:             48 milliseconds Medium filter:   149 milliseconds High filter:       1138 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. Ex 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

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    SP233: Thermocouple/ milliVolt Input Signal Splitter; Two-wire

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    SP236: Current/milliVolt Input Splitter; Two-wire

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    SP237: Process Voltage Input Signal Splitter; Two-wire

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    SP238: High Voltage Input Signal Splitter; Two-wire

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    • 4-20mA outputs (sink/source)
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