INOR IsoPAQ-21L / 22L Loop-Powered Isolators

1-channel (21L) and 2-channel (22L) loop-powered isolators for 0(4)–20 mA signals — no external supply, 4 kV isolation, Protective Separation per EN 61140, 12.5 mm DIN-rail housing.

Key advantages

No power supply — loop-powered; lower install cost than active isolation transmitters.
4 kV isolation — 600 VAC/DC working voltage; Protective Separation EN 61140.
1- or 2-channel — IsoPAQ-22L doubles density in the same 12.5 mm width class.
±0.1% FS class — voltage drop <2 V; response ~2 ms @ 250 Ω / 6 ms @ 750 Ω.

Typical applications

Breaking ground loops on 4–20 mA transmitter runs into PLC/DCS.
Isolating field instruments from control-room I/O without adding a PSU.
High-density DIN-rail panels needing dual-channel isolators.

Selection guide

21L vs 22L — 1-channel (70ISL21001) vs 2-channel (70ISL22001).
Signals — Input/output 0(4)…20 mA; max input 30 V; max output 28 V.
Accuracy — Transmission error ±0.1% of end value; load error ±0.03%/100 Ω.
Environment — Operation −20…+70 °C; IP20; plug-in screw terminals ≤2.5 mm².
Housing — 12.5 mm width; ~104 mm depth; ~100 g.

Common mistakes

Ordering 21L when two channels in one housing (22L) would save rail space.
Expecting signal conversion (mA↔V) — these are same-signal isolators.
Ignoring series voltage drop (<2 V) on long loops with limited compliance.
Accessories · Signal conditioner buying guide

When to RFQ / what to tell us

21L (1 ch) vs 22L (2 ch); quantity.
Loop voltage/compliance; load resistance.
Ship-to country; any spare-parts needs.

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Specs

Spec	Value
SKU	35536
Brand	INOR
Model	IsoPAQ-21L / IsoPAQ-22L
Product type	loop-powered isolator
Output signal	0(4)…20 mA
Accuracy	±0.1% FS (typical / transmission error)
Isolation	4 kV, 50 Hz; working voltage 600 VAC/DC
Supply voltage	None (loop powered)
Ambient temperature	−20 to +70 °C
Notes	Specs from INOR IsoPAQ-21L/22L catalog sheet.

Documents

FAQ

Q: Do I need a power supply? A: No — both 21L and 22L are loop powered from the 0(4)–20 mA signal.

Q: What should I send for a quote? A: Channel count, quantity, ship-to. Compatible with systems using INOR IsoPAQ-21L/22L if you need a drop-in check — we do not claim authorized-dealer status.