Click to zoom

Please sign in or register to see model options and to add products to your cart.

Product short description:
  • DC current input
  • Single/dual-channel DC-powered isolators

These units receive 4-20mA process current inputs and provide isolated 4-20mA output signals. Each channel operates independently and is isolated from the others to prevent interaction between channels.

651T, 652T: Multi-Channel, Two-Wire Isolators Description

For easy troubleshooting, each unit has LEDs and diagnostic test points. Power LEDs help identify output open loop conditions. The precision 10 ohm sense resistor enables monitoring of the output signal without disturbing field wiring.

Input / Output Ranges
4 to 20mA DC input
4 to 20mA DC output

Power Requirement
12 to 36V DC (loop-powered)
Two-wire transmitter

Approvals
CE marked. UL, cUL listed
Class I, Division 2, Groups A, B, C, D

651T & 652T Isolators Performance

Reference Test Conditions: Input/Output current: 4 to 20mA; output load 500 ohms; 77°F (25°C).

Input range: 4 to 20mA input (each channel).

Input burden
Voltage drop (651T, 652T): Less than 1.5V, typical (75 ohm equivalent).
Voltage drop (653T): Less than 3.0V, typical (150 ohm equivalent).

Output range
4-20mA DC output (each channel).
Rl = (Psupply-12V) / 0.02.

Output compliance: Psupply = 12V + (0.02 x Rload).

Output limiting: Outputs are limited to 36mA.

Output ripple: Less than ±0.1% of the maximum output span.

Accuracy: ±0.1% of output span. Error includes the combined effects of isolator repeatability, hysteresis, terminal point linearity and adjustment resolution.

Ambient temperature effect: Less than ±0.006% of input span per °F (±0.01% per °C) over the ambient temperature range for reference test conditions. This specification includes the combined effects of zero and span over temperature.

Calibration: Two 15-turn potentiometers (zero and span) per channel, accessible from front of the unit.

Bandwidth: -3dB at 45Hz, typical.

Response time: For a step input, the output reaches 98% of output span in 15mS, typical.

Noise rejection
Common mode: 100dB at 60Hz, typical.
Normal mode: -5dB at 60Hz, 100 ohm source, typical.

Diagnostics
LED power indicator: Off for output open loop detection, power, or load compliance problem.
Field test points: An internal 10 ohm sense resistor provides test points for monitoring the output signal current during field maintenance.

Environmental

Ambient Temperature
Operating: -25 to 70°C (-13 to 158F).
Storage: -40 to 85°C (-40 to 185°F).

Relative Humidity: 5 to 95%.

Power Requirement: 12 to 50V DC for each output channel.

Isolation: Inputs, outputs, and individual channels are isolated from each other for common-mode voltages up to 250V AC, or 354V DC off ground, on a continuous basis (will withstand 1500V AC dielectric strength test for one minute without breakdown).

Radiated Field Immunity (RFI): Complies with EN61000-4-3 Level 3 (10V/m, 30 to 1000MHz) and European Norm EN50082-1.

Electromagnetic Field Immunity (EMI): Less than ±0.25% of output span effect under the influence of electromagnetic fields from switching solenoids, commutator motors, and drill motors.

Surge Immunity: Complies with EN61000-4-5 Level 3 (2KV) and European Norm EN50082-1.

Electrical Fast Transient (EFT): Complies with EN61000-4-4 Level 3 (2KV) and European Norm EN50082-1.

Electrostatic Discharge (ESD): Complies with EN61000-4-2 Level 3 (8KV air, 4KV direct to the enclosure port) and European Norm EN50082-1.

Radiated Emissions: Meets or exceeds European Norm EN50081-1 for Class B equipment.

Approvals
CE marked, UL & cUL listed.
Hazardous Locations: Class I: Div. 2; Groups A, B, C, D.

Physical

Enclosure: Case: Self-extinguishing NYLON type 6.6 polyamide thermoplastic UL94 V-2 NEMA Type 1 enclosure.

Connectors (Removable Terminal Blocks): Wire Range: AWG #14-22 (AWG #12 stranded only).

Printed Circuit Boards: Military grade FR-4 epoxy glass circuit board.

Dimensions
1.05W x 4.68H x 4.35D inches.
26.7W x 95.3H x 110.5D millimeters.

Shipping Weight: 1 pound (0.45 Kg) packed.

  • Two channels in a single unit saves space and reduces costs
  • Galvanic isolation eliminates ground loops, reduces noise, and blocks transient signals
  • Independent channels prevent signal interaction and offer spares for later use
  • Power LEDs provide a visual indication of operational process loops
  • Excellent accuracy and stability ensure reliability
Why Do I Need Electrical Isolation? - 8500988 (Log in to view the file)
Why do we need signal isolation? Acromag is in the business of signal conditioning. We manufacture circuits that amplify, isolate, filter, and convert one signal form to another. Most of these circuits also provide electrical isolation. However, added isolation has a cost. Thus, sometimes customers either question their need for isolation or fail to recognize...
How to Re-transmit and Isolate 4-20mA Signals from Remotely-Mounted 3-Wire Gas Detection Sensors - 8400957
Defining the Problem: Signals from 3-wire remote sensors that monitor combustible and toxic gases are typically transmitted directly to the remote gas monitor or controller. However, in some cases, 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...
How to Select the Right Isolator - 8401045
The Ins and Outs of Isolation: A Guide to Selecting the Right Isolator Acromag manufactures a variety of isolators to provide a cost-effective solution for many applications. The primary function of the isolator is to eliminate ground loops that may exist between two or more instruments. A classical application isolates the control room equipment (computers,...
How to Choose a 4-20mA Isolator - 8400850
Very often, the simple task of choosing an isolator requires more than just comparing the number of channels and the cost per point. To help you with this exercise, here are some concepts to know when you need to choose a 4-20 mA isolator. The lowest cost approach is a two-wire system using output loop-powered...
How to Use Acromag 600T Series Isolated Transmitters - 8401028
Application 1 Re-transmitting a signal from a two-wire loop to a second location. Solution Use either a model 651T-0600 (single channel) or 652T-0600 (dual channel) transmitter. Application 2 Splitting a signal from a two-wire loop: two outputs for different locations. Solution Use either a 653T-0600 (single input, dual output) or 652T-0600 (dual input, dual output)...

Manuals

651T, 652T, 653T User Manual (Log in to download the file)

  • Compare

    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
     
    Select options

Additional information

Weight 8 oz
Dimensions 1.1 × 5 × 4.5 in
Part Number

651T-0600: single I/O channel, 652T-0600: dual I/O channels

Product Series

600 Series

  • Description

    651T, 652T: Multi-Channel, Two-Wire Isolators Description

    For easy troubleshooting, each unit has LEDs and diagnostic test points. Power LEDs help identify output open loop conditions. The precision 10 ohm sense resistor enables monitoring of the output signal without disturbing field wiring.

    Input / Output Ranges
    4 to 20mA DC input
    4 to 20mA DC output

    Power Requirement
    12 to 36V DC (loop-powered)
    Two-wire transmitter

    Approvals
    CE marked. UL, cUL listed
    Class I, Division 2, Groups A, B, C, D

    651T & 652T Isolators Performance

    Reference Test Conditions: Input/Output current: 4 to 20mA; output load 500 ohms; 77°F (25°C).

    Input range: 4 to 20mA input (each channel).

    Input burden
    Voltage drop (651T, 652T): Less than 1.5V, typical (75 ohm equivalent).
    Voltage drop (653T): Less than 3.0V, typical (150 ohm equivalent).

    Output range
    4-20mA DC output (each channel).
    Rl = (Psupply-12V) / 0.02.

    Output compliance: Psupply = 12V + (0.02 x Rload).

    Output limiting: Outputs are limited to 36mA.

    Output ripple: Less than ±0.1% of the maximum output span.

    Accuracy: ±0.1% of output span. Error includes the combined effects of isolator repeatability, hysteresis, terminal point linearity and adjustment resolution.

    Ambient temperature effect: Less than ±0.006% of input span per °F (±0.01% per °C) over the ambient temperature range for reference test conditions. This specification includes the combined effects of zero and span over temperature.

    Calibration: Two 15-turn potentiometers (zero and span) per channel, accessible from front of the unit.

    Bandwidth: -3dB at 45Hz, typical.

    Response time: For a step input, the output reaches 98% of output span in 15mS, typical.

    Noise rejection
    Common mode: 100dB at 60Hz, typical.
    Normal mode: -5dB at 60Hz, 100 ohm source, typical.

    Diagnostics
    LED power indicator: Off for output open loop detection, power, or load compliance problem.
    Field test points: An internal 10 ohm sense resistor provides test points for monitoring the output signal current during field maintenance.

    Environmental

    Ambient Temperature
    Operating: -25 to 70°C (-13 to 158F).
    Storage: -40 to 85°C (-40 to 185°F).

    Relative Humidity: 5 to 95%.

    Power Requirement: 12 to 50V DC for each output channel.

    Isolation: Inputs, outputs, and individual channels are isolated from each other for common-mode voltages up to 250V AC, or 354V DC off ground, on a continuous basis (will withstand 1500V AC dielectric strength test for one minute without breakdown).

    Radiated Field Immunity (RFI): Complies with EN61000-4-3 Level 3 (10V/m, 30 to 1000MHz) and European Norm EN50082-1.

    Electromagnetic Field Immunity (EMI): Less than ±0.25% of output span effect under the influence of electromagnetic fields from switching solenoids, commutator motors, and drill motors.

    Surge Immunity: Complies with EN61000-4-5 Level 3 (2KV) and European Norm EN50082-1.

    Electrical Fast Transient (EFT): Complies with EN61000-4-4 Level 3 (2KV) and European Norm EN50082-1.

    Electrostatic Discharge (ESD): Complies with EN61000-4-2 Level 3 (8KV air, 4KV direct to the enclosure port) and European Norm EN50082-1.

    Radiated Emissions: Meets or exceeds European Norm EN50081-1 for Class B equipment.

    Approvals
    CE marked, UL & cUL listed.
    Hazardous Locations: Class I: Div. 2; Groups A, B, C, D.

    Physical

    Enclosure: Case: Self-extinguishing NYLON type 6.6 polyamide thermoplastic UL94 V-2 NEMA Type 1 enclosure.

    Connectors (Removable Terminal Blocks): Wire Range: AWG #14-22 (AWG #12 stranded only).

    Printed Circuit Boards: Military grade FR-4 epoxy glass circuit board.

    Dimensions
    1.05W x 4.68H x 4.35D inches.
    26.7W x 95.3H x 110.5D millimeters.

    Shipping Weight: 1 pound (0.45 Kg) packed.

  • Features & Benefits

    • Two channels in a single unit saves space and reduces costs
    • Galvanic isolation eliminates ground loops, reduces noise, and blocks transient signals
    • Independent channels prevent signal interaction and offer spares for later use
    • Power LEDs provide a visual indication of operational process loops
    • Excellent accuracy and stability ensure reliability
  • Tech Papers

    Why Do I Need Electrical Isolation? - 8500988 (Log in to view the file)
    Why do we need signal isolation? Acromag is in the business of signal conditioning. We manufacture circuits that amplify, isolate, filter, and convert one signal form to another. Most of these circuits also provide electrical isolation. However, added isolation has a cost. Thus, sometimes customers either question their need for isolation or fail to recognize...
    How to Re-transmit and Isolate 4-20mA Signals from Remotely-Mounted 3-Wire Gas Detection Sensors - 8400957
    Defining the Problem: Signals from 3-wire remote sensors that monitor combustible and toxic gases are typically transmitted directly to the remote gas monitor or controller. However, in some cases, 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...
    How to Select the Right Isolator - 8401045
    The Ins and Outs of Isolation: A Guide to Selecting the Right Isolator Acromag manufactures a variety of isolators to provide a cost-effective solution for many applications. The primary function of the isolator is to eliminate ground loops that may exist between two or more instruments. A classical application isolates the control room equipment (computers,...
    How to Choose a 4-20mA Isolator - 8400850
    Very often, the simple task of choosing an isolator requires more than just comparing the number of channels and the cost per point. To help you with this exercise, here are some concepts to know when you need to choose a 4-20 mA isolator. The lowest cost approach is a two-wire system using output loop-powered...
    How to Use Acromag 600T Series Isolated Transmitters - 8401028
    Application 1 Re-transmitting a signal from a two-wire loop to a second location. Solution Use either a model 651T-0600 (single channel) or 652T-0600 (dual channel) transmitter. Application 2 Splitting a signal from a two-wire loop: two outputs for different locations. Solution Use either a 653T-0600 (single input, dual output) or 652T-0600 (dual input, dual output)...
  • Specs & Data Sheets

    Manuals

    651T, 652T, 653T User Manual (Log in to download the file)

  • Accessories

    • Compare

      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
       
      Select options
  • Additional information

    Additional information

    Weight 8 oz
    Dimensions 1.1 × 5 × 4.5 in
    Part Number

    651T-0600: single I/O channel, 652T-0600: dual I/O channels

    Product Series

    600 Series