4-20mA Signal Isolator, Explosion Proof, DC 24V

Name: 4-20mA Signal Isolator, Explosion Proof, DC 24V
Brand: Such.com
SKU: SUCH-SIGNI-SFX
Price: 112.84 USD
Availability: InStock
Rating: 5.0 (1 reviews)

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SKU: SUCH-SIGNI-SFX

$112.84

● [Ex ia Ga] II C explosion proof rating ● IS/non-IS isolation withstand voltage 2500VAC ● Hazardous area control loop response time 2ms ● Loop powered output excitation voltage ≥16V@20mA

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Overview
Spec
Application
FAQ
Reviews

Overview

This signal isolator 4‑20mA accepts 4‑20mA DC current with 75Ω input impedance. It outputs passive 4‑20mA, active 0‑20mA, 0‑10V, or others. Available in 1‑in‑1‑out, 1‑in‑2‑out, or 2‑in‑2‑out, consuming 1.3W or 1.8W. As an analog isolator, it delivers ±0.1% accuracy, ≤2ms response, and 40ppm/°C drift. This explosion proof isolator features [Ex ia Ga] II C certification, 2500VAC isolation (intrinsic/non‑intrinsic), distribution voltage ≥16V @20mA, and IEC 61326‑3‑1 compliance. This galvanic isolator 4‑20mA operates on DC 18‑32V and is ideal for hazardous area signal isolation.

Feature

Explosion-proof approval: [Ex ia Ga] IIC allows direct Zone 0 installation for hydrogen/acetylene without heavy enclosures.
Dielectric strength: 2500 V AC between IS and non-IS sides exceeds 1500 V AC for dual safety barrier.
Response time: ≤2 ms delivers ultra-fast analog transmission for emergency shutdown and fast control loops.
Distribution voltage: ≥16 V at 20 mA (open ≤26 V) powers IS transmitters directly, eliminating zener barriers.
Accuracy & drift: 40 ppm/°C with ±0.1% FS (25°C) maintains precision across ambient changes, reducing maintenance.
Output & power: passive/active current and DC voltage outputs, 1.3W/1.8W, match PLC inputs while minimizing heat.

Dimension (Unit: mm)

Multi-view dimensional drawing of SFX series signal isolators, showing 12.7mm width housing (SFX110/112) and 17.7mm width housing (SFX114) with full mechanical dimensions

Wiring Diagram

Isolated barrier wiring diagram for 3-wire transmitter in Danger Zone. Left Safe Zone provides power and single isolation output. Middle transmitter. Right Safe Zone provides dual isolated 4-20mA outputs

Spec

Input Signal	4-20mA
Output Signal Type	Passive current: 4-20mA
	Active current: 0-20mA
	Active current: 4-20mA
	DC voltage: 0-5V
	DC voltage: 0-10V
Load Capacity	For passive current: R_L ≤ [(U-3)/0.02]Ω (U = loop supply voltage)
	For active current 0-20mA: ≤ 550Ω
	For active current 4-20mA: ≤ 550Ω
	For DC voltage 0-5V: ≥ 1MΩ
	For DC voltage 0-10V: ≥ 2MΩ
Number of Inputs & Outputs	1 input channel & 1 output channel
	1 input channel & 2 output channels
	2 input channels & 2 output channels
Full Load Power Consumption	Single-channel full-load output: 1.3 W
Full Load Power Consumption	Dual-channel full-load output: 1.8 W (at 24 VDC supply)
Dielectric Strength	≥2500 VAC (between intrinsically safe side / non-intrinsically safe side)
Dielectric Strength	≥1500 VAC (between power supply / non-intrinsically safe side)
Distribution Voltage	Open circuit voltage ≤26 V
Distribution Voltage	at 20 mA full load, output voltage ≥16 V
Isolation Transmission Accuracy	±0.1% F.S (at 25°C ± 2°C)
Response Time	≤2 ms
Temperature Drift	40 ppm / °C
Insulation Resistance	≥100 MΩ (between input, output, and power supply)
Input Impedance	Approx. 75 Ω (for 4-20mA input)
Power Supply	Typical 24 V DC (acceptable range 18-32 V DC)
Explosion-proof Mark	[Ex ia Ga] II C
Input Signal Type	DC current signal: 4-20mA (fixed, not selectable)
Electromagnetic Compatibility	IEC 61326-3-1
Certifications	CE Compliant

Application

Chemical Terminal

Offshore Oil Platform

Oil and gas analyzer shelter interior signal context

Oil & Gas Analyzer

FAQ

Q1: What installation locations does the [Ex ia Ga] II C rating permit for this isolator? ❯

A: This is the highest level of intrinsic safety certification for explosive atmospheres:

Ex ia – Intrinsic safety "ia" protection level (two independent faults allowed, still safe)
Ga – Equipment protection level for Zone 0, Zone 1, and Zone 2 (gas environments)
II C – Suitable for the most explosive gas groups, including hydrogen (H₂) and acetylene (C₂H₂)

You can install this isolator in Zone 0, Zone 1, or Zone 2 hazardous areas where explosive gas mixtures may be present continuously or occasionally.

Q2: What is the isolation rating, and does it provide greater safety than standard isolators? ❯

A: Yes – much safer. Dielectric strength is:

≥2500VAC between intrinsically safe side and non‑intrinsically safe side
≥1500VAC between power supply and non‑intrinsically safe side

Standard isolators typically offer 1500VAC across all ports – this unit provides an extra level of protection specifically designed for hazardous area applications. Insulation resistance is ≥100MΩ between all ports.

Q3: Does this comply with EMC standards? ❯

A: Yes – complies with IEC 61326‑3‑1 – the industrial EMC standard specifically for safety‑related systems. It has passed rigorous testing for both emissions and immunity, so it won't interfere with nearby instruments and is highly resistant to common industrial electrical noise – including surges, ESD, and RF interference.

1 review(s)

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From: Daniel Parker | Date: 7/22/2026 8:34 AM

This signal isolator explosion proof works well

I bought this for a control panel replacement project. Installation was simple and the signal isolator explosion proof has been stable during daily operation. The wiring matched my existing setup without much adjustment. It’s not overloaded with features, but it handles the job well and has been reliable so far.

4-20mA Signal Isolator, Explosion Proof, DC 24V

Feature

Dimension (Unit: mm)

Wiring Diagram

Chemical Terminal

Offshore Oil Platform

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