SP238: Two-Wire High Voltage Input Signal Splitter

Description

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 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: ±150V, medium filtering
Output: 4 to 20mA

Input Ranges and Accuracy:
Range                                     Accuracy* (typical)
±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 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 (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 filter:              88 milliseconds
Low filter:          100 milliseconds
Medium filter:  237 milliseconds
High filter:      1762 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: 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