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Product short description:
  • DC current and low voltage input
  • 4-20mA outputs (sink/source)
  • 7-32V DC loop power

The SP236 model is a high-performance signal splitter that converts one DC current or millivolt input into two isolated proportional 4-20mA control signals. Power is received from one or both output loop currents.

Click here to watch a short video highlighting the features of the Acromag SP Series.

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The SP236 model is a high-performance signal splitter that converts one DC current or millivolt input into two isolated proportional 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 from each output circuit. 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: 4 to 20mA, medium filter.
Output: 4 to 20mA.

Input Ranges and Accuracy
Range                                                Accuracy* (typical)
±20mA                                                        ±0.05% of span
0 to 20mA                                                  ±0.05% of span
4 to 20mA                                                  ±0.05% of span
0 to 11.17mA (for AC sensor)                 ±0.05% of span
±1mA                                                           ±0.05% of span
±0.5V                                                            ±0.05% of span
0 to 500mV                                                ±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
Current input: 24.9 ohms.
Voltage input: 15M ohms.

Input Over-Voltage Protection: Bipolar Transient Voltage Suppressers (TVS), 5.6V clamp level typical.

Input Resolution
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: Dual isolated 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 filter:              17 milliseconds
Low filter:           41 milliseconds
Medium filter: 138 milliseconds
High filter:      1142 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: Loop powered, 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

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 (0.69 x 4.51 x 3.90 inches).

Shipping Weight: 0.22 kg (0.5 pounds) packed.

  • Easy configuration via USB with Windows software or Agility app for Android
  • Single unit accepts input ranges up to ±500mV, ±20mA DC, or 0-20A AC (with external sensor)
  • 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
How to Wire a 2 or 4-Wire Current Input Module Application Note
Application Note: Current Input Wiring: 2-Wire & 4-Wire TT236 / SP236 / DT236 2/3-Wire Transmitters & Splitters TT336 / SP336 / DT336 4-Wire Transmitters & Splitters Featured Products: DT236: Current / milliVolt Input Two-Wire Dual Transmitter DT336: Current / Voltage Input Four-Wire Dual Transmitter SP236: Two-Wire Current / milliVolt Input Signal Splitter SP336: Four-Wire Current...
How to Re-transmit and Isolate 4-20mA Signals from Remotely-Mounted 3-Wire Gas Detection Sensors Application Note
Defining the Problem: Typically, signals from 3-wire remote sensors monitoring combustible and toxic gases are transmitted directly to the remote gas monitor or controller. However, there are cases when it’s desirable to send the signal to more than one destination. This can either be accomplished by re-transmitting the existing signal to additional locations or by...
Circuit Grounding and Why it's Important Whitepaper (Log in to view the file)
Circuit Grounding & Why it’s Important This whitepaper is Part 1 of a three-part Grounding Electrical Equipment Best Practices series that looks at grounding and its role in protecting personnel, equipment, and ensuring the integrity of electrical signals. In this part, we will review circuit grounding and its importance to you, as well as the...
How Ground Fault Circuit Interrupters Work & Protect Us from Shock Whitepaper (Log in to view the file)
How Ground Fault Circuit Interrupters Work & Protect Us from Shock This Electrical Ground Rules white paper is Part 2 of a three-part series that takes a look at grounding and its role in protecting personnel and equipment, and ensuring the integrity of electrical signals. Part 2 examines electrical ground rules in more depth, and...
Ground as a Voltage Stabilizer & Transient Limiter Whitepaper (Log in to view the file)
Ground as a Voltage Stabilizer & Transient Limiter This Electrical Ground Rules whitepaper is Part 3 of a three-part series that takes a look at grounding and its role in protecting personnel and equipment, and ensuring the integrity of electrical signals. Consideration of ground can be very complex and application specific. But in many of...
How to Split Gas Detector Outputs for Monitoring & Process Control Application Note
Defining the Problem: At a remote wastewater pumping station, Methane (CH4) and Hydrogen Sulfide (H2S) are monitored with MSA X5000 Gas Monitors. The 4-20mA outputs must be split to a GasCard XL Controller and Emerson Ovation I/O. The Controller has powered inputs but the Ovation inputs require an external power source. Typical splitters have 2...
SP Series Windows Configuration Software (Log in to download the file)
Agility Config Tool (Tethered) (Log in to download the file)
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    • Download Windows configuration software from the software tab below.
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Additional information

Weight 8 oz
Dimensions 2.4 × 1.85 × 0.925 in
Part Number

USB-Isolator: includes USB cable

  • Description

    This compact, industrial-grade isolator provides a high-voltage isolation barrier between a computer and a connected USB device.

    The isolation protects equipment from electrical surges and transient voltage spikes. It also eliminates ground loop currents flowing between the PC and peripherals which can cause damage and inaccurate measurements. Additionally, isolation minimizes conducted noise from static discharge, magnetic fields, and radio frequency interference.

    Acromag’s USB isolator is very easy to use. The isolator inserts in-line with the USB connection and operates transparently. No special software drivers are required. The unit receives power from the PC’s USB port and isolates that power to the connected device. High noise immunity and low radiated emissions ensure reliable data transfer in sensitive applications.

    A number of high-performance features help provide convenient and dependable operation. The green LED indicates that power is being received and blinks if the connected device draws too much current. An internal jumper lets you switch from Full Speed (12 Mbps) to Low Speed (1.5 Mbps) communication. The reset button offers a simple way to reinitialize a connected device without breaking the cable connection. High-retention USB sockets keep cables securely attached under shock and vibration.

  • Features & Benefits

    • Easy configuration via USB with Windows software or Agility app for Android
    • Single unit accepts input ranges up to ±500mV, ±20mA DC, or 0-20A AC (with external sensor)
    • 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
  • Tech Papers

    How to Wire a 2 or 4-Wire Current Input Module Application Note
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    How to Re-transmit and Isolate 4-20mA Signals from Remotely-Mounted 3-Wire Gas Detection Sensors Application Note
    Defining the Problem: Typically, signals from 3-wire remote sensors monitoring combustible and toxic gases are transmitted directly to the remote gas monitor or controller. However, there are cases when it’s desirable to send the signal to more than one destination. This can either be accomplished by re-transmitting the existing signal to additional locations or by...
    Circuit Grounding and Why it's Important Whitepaper (Log in to view the file)
    Circuit Grounding & Why it’s Important This whitepaper is Part 1 of a three-part Grounding Electrical Equipment Best Practices series that looks at grounding and its role in protecting personnel, equipment, and ensuring the integrity of electrical signals. In this part, we will review circuit grounding and its importance to you, as well as the...
    How Ground Fault Circuit Interrupters Work & Protect Us from Shock Whitepaper (Log in to view the file)
    How Ground Fault Circuit Interrupters Work & Protect Us from Shock This Electrical Ground Rules white paper is Part 2 of a three-part series that takes a look at grounding and its role in protecting personnel and equipment, and ensuring the integrity of electrical signals. Part 2 examines electrical ground rules in more depth, and...
    Ground as a Voltage Stabilizer & Transient Limiter Whitepaper (Log in to view the file)
    Ground as a Voltage Stabilizer & Transient Limiter This Electrical Ground Rules whitepaper is Part 3 of a three-part series that takes a look at grounding and its role in protecting personnel and equipment, and ensuring the integrity of electrical signals. Consideration of ground can be very complex and application specific. But in many of...
    How to Split Gas Detector Outputs for Monitoring & Process Control Application Note
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  • Specs & Data Sheets

  • Software

    SP Series Windows Configuration Software (Log in to download the file)
    Agility Config Tool (Tethered) (Log in to download the file)
  • Accessories

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      • DIN rail end stop for hazloc approvals
      $10
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      Agility™ Config Tool (Tethered)

      • Tethered Agility™ Config Tool mobile application
      • For Acromag SP Series Signal Splitters and most TT Series Transmitters
      • Download available on Google Play for free.
      • Download Windows configuration software from the software tab below.
      Read more
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      PS5R: Slim Line Power Supplies

      • 10W, 15W, 30W, 60W, 90W, 120W, and 240W models
      • Universal Input (85-264V AC / 100-370V DC)
      • Lightweight and compact size
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      Select options
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      • Software Interface Package for Acromag DT, ST, TT Series Transmitters and SP, uBSP Series Signal Splitters.
      • Includes configuration sofware CD-ROM (5040-xxx), isolator (USB-ISOLATOR) and two USB cable (4001-112, 4001-113) (Recommend one kit per customer.)
      • Easy setup and digital calibration via USB with Windows configuration software.
      • Download the configuration software only - from the Software Tab
      $170
      Select options
    • Compare

      USB Cables

      $20
      Select options
    • Compare

      USB Isolator

      • USB-powered, USB 2.0 and 1.1 compatible
      • 1500V AC / 2100V DC isolation
      • No drivers required
      This compact, industrial-grade isolator provides a high-voltage isolation barrier between a computer and a connected USB device.
      $110
      Select options
  • Additional information

    Additional information

    Weight 8 oz
    Dimensions 2.4 × 1.85 × 0.925 in
    Part Number

    USB-Isolator: includes USB cable