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4-20mA Loop Powered Passive Isolator
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4-20mA Loop Powered Passive Isolator

This loop-powered 4-20 mA isolator is offered as an accessory for the ACR SRX7 Process Signal Logger. It electrically isolates transmitters from the logger’s 4-20 mA input channels, helping maintain stable measurements when multiple process signals are being logged. The device is loop-powered and requires no auxiliary power supply, making it easy to install directly in the current loop.

Key Features

  • Offered for use with the ACR SRX7 Process Signal Logger - Provides a convenient way to isolate 4-20 mA process signals connected to SRX7 input channels.
  • Compatible with SRX7 4-20 mA input channels - Maintains the standard 4-20 mA signal range used by industrial transmitters.
  • Prevents ground interaction between logger channels - Helps eliminate ground loop effects between multiple SRX7 input channels, improving measurement stability when logging several transmitters.
  • Loop-powered operation - No auxiliary power supply required. The isolator derives its operating power directly from the 4-20 mA current loop.
  • Galvanic isolation between input and output loops
  • Improves measurement reliability by reducing electrical noise
  • DIN-rail mounting for easy panel installation
SKU: 35-0070
$462.00 USD

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Description Specifications Q&A

The 4-20 mA Loop-Powered Passive Isolator provides galvanic isolation between a transmitter and the input channel of the ACR SRX7 Process Signal Logger while preserving the original 4-20 mA measurement signal.

In many cases, transmitters can be connected directly to the SRX7 without difficulty. However, in some installations—particularly where multiple transmitters are being logged or where equipment shares different electrical grounds—signal interaction or ground loop effects can occur. An isolator helps prevent these issues by electrically separating the transmitter loop from the logger input while allowing the measurement signal to pass accurately.

The device is loop-powered, meaning it does not require an external or auxiliary power supply. The small amount of power needed for operation is derived directly from the 4-20 mA signal loop, making installation straightforward.

This isolator is intended specifically for 4-20 mA current loop applications, such as pressure, flow, level, and temperature transmitters commonly used with the SRX7 Process Signal Logger. It does not isolate or convert voltage signals such as 0-10 VDC.

When needed, the isolator provides a simple way to improve measurement stability and protect logger inputs in more complex installations.

Specifications

Approval CE
Dimensions (WxHxD) 17.5x100x112mm
Input Channel Numbers 2
Input Current 4-20 mA
Isolation 1,500 Vac (2 way)
Mounting 35 mm DIN rail guide
Norms EN 50081-2; EN 55011; EN 50082-2; EN 61000-2-2/4;EN 50140/141; EN 61010-1
Operating Temperature 0 - 50°C
Output Channel Numbers 2
Output Current 4-20 mA
Power Supply From the 4-20mA input loop
Protection Degree IP20
Response Time 100 ms
Status Indicators Power supply, error, data transmission, data reception, input status

Q&A

Is this isolator required when using the SRX7?

No. In most applications, 4-20 mA transmitters can be connected directly to the SRX7 input channels without requiring isolation. This isolator is offered as an optional accessory for situations where electrical interaction between signals, ground loop effects, or electrical noise may affect measurement stability.

When might an isolator be helpful?

Isolation may be useful in situations such as:

  • Logging multiple transmitters connected to different electrical grounds
  • Installations with long signal wiring runs
  • Electrically noisy environments (motors, drives, industrial equipment)
  • When monitoring a process signal that is already connected to another control system

In these cases, the isolator can help maintain stable and reliable signal measurements.

Does the isolator require its own power supply?

No. The device is loop-powered, meaning it derives the small amount of power needed for operation directly from the 4-20 mA current loop. No external or auxiliary power supply is required.

How is the isolator used with the SRX7?

The isolator is inserted in series between the transmitter and the SRX7 input channel. The transmitter drives the isolator input, and the isolator provides a separate, electrically isolated 4-20 mA output to the logger.

Can this isolator be used with 0-10 V signals?

No. This device is designed specifically for 4-20 mA current loop signals. It does not isolate or convert voltage signals such as 0-10 VDC.

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Translation missing: en.general.search.loading
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