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

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.

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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
APP NOTE: A Guide to Selecting the Right Isolator
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,...
APP NOTE: How to Choose a 4-20mA Isolator
How to Choose a 4-20mA Isolator 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 a few concepts to know when specifying a 4-20 mA Isolator.
APP NOTE: Using 600T Series Isolators for Controller I/O Signals & a Built-In Excitation Supply
Application Note 6: 600T Problem: Require 4-wire isolators for input and output signals for controller. Built-in excitation supply needed for some field 2-wier devices. Solution: Model 632T-0100 (dual channel, AC powered) or Model 632T-0500 (dual channel, DC powered), Model 631T for single channel 4-wire isolators.
APP NOTE: Low-cost, Channel-to-channel Isolation of 4-20mA Signals for Controllers using Acromag's Model 652T or 674T
Application Note 4: 600T Problem: Low-cost, channel-to-channel isolation of 4-20mA signals for controllers. Solution: Use either a 652T-0600 (dual channel) for A/D cards or a 674T-0600 (quad channel) for D/A cards.
WHITEPAPER: The Importance of Signal Isolation (Log in to view the file)
Learn How to Recognize the Need for Isolation Learn how to recognize the need for isolation in this easy to understand white paper. This paper covers the basic aspects of electrical isolation, what it does for you, why you need it, and how we test for it. Common Methods Of Signal Isolation So the real...

Manuals

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

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Additional information

Weight 8 oz
Dimensions 12 × 13 × 3 in
Part Number

TBK-B01: two 6-position barrier strip style, TBK-B02: four 6-position barrier strip style, TBK-B03: one 3-position and three 6-position barrier strip style, TBK-S01: two 6-position spring clamp style, TBK-S02: four 6-position spring clamp style, TBK-S03: one 3-position and three 6-position spring clamp style

  • Description

    These optional terminal blocks provide safe and secure wiring connections. Large captive screw terminals or spring clamps enable fast, easy connections. Pluggable terminals are removable for simple disconnection of the module without disturbing the wiring.

    Optional terminal blocks are compatible with Acromag’s “white box” modules including BusWorks 900 Series, IntelliPack 800 Series, and isolated transmitters 600 Series.

    Barrier Strip Terminal Blocks

    Wire Range: 12-26 AWG
    Safety Ratings: UL, CSA, CE, TUV.
    Current/Voltage Rating: 15A, 300V.
    Pin Spacing: 5.08mm (0.2”).
    Housing Material: PPO, UL 94 V-0, Black.
    Contacts: Tin-Lead Plated Phosphor Bronze.
    Screw: M3, Nickel Plated Steel.
    Insulation Resistance: ≥105 Megohms.
    Dielectric Withstand: <3000V.

    Spring Clamp Terminal Blocks

    Wire Range: 12-28 AWG.
    Safety Ratings: UL, CSA, CE, TUV.
    Current/Voltage Rating: 15A, 300V.
    Pin Spacing: 5.08mm (0.2”)
    Housing Material: PPO, UL 94 V-0, Black.
    Contacts: Tin-Lead Plated Phosphor Bronze.
    Spring Clamp: Stainless Steel.
    Insulation Resistance: ≥105 Megohms.
    Dielectric Withstand: <3000V.

    Acromag Standard Cage Clamp Terminal Blocks

    Wire Range: 12-24 AWG.
    Current/Voltage Rating: 12A, 300V (UL).
    Pin Spacing: 5.08mm (0.2”).
    Housing Material: UL 94 V-0.
    Terminal: Brass, nickel plated.
    Wire Protector with Contact: Copper alloy tin plating.
    Screw: M3, steel, nickel over copper plating.
    Contact Resistance: ≤10 milliohms per circuit.

  • 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

    APP NOTE: A Guide to Selecting the Right Isolator
    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,...
    APP NOTE: How to Choose a 4-20mA Isolator
    How to Choose a 4-20mA Isolator 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 a few concepts to know when specifying a 4-20 mA Isolator.
    APP NOTE: Using 600T Series Isolators for Controller I/O Signals & a Built-In Excitation Supply
    Application Note 6: 600T Problem: Require 4-wire isolators for input and output signals for controller. Built-in excitation supply needed for some field 2-wier devices. Solution: Model 632T-0100 (dual channel, AC powered) or Model 632T-0500 (dual channel, DC powered), Model 631T for single channel 4-wire isolators.
    APP NOTE: Low-cost, Channel-to-channel Isolation of 4-20mA Signals for Controllers using Acromag's Model 652T or 674T
    Application Note 4: 600T Problem: Low-cost, channel-to-channel isolation of 4-20mA signals for controllers. Solution: Use either a 652T-0600 (dual channel) for A/D cards or a 674T-0600 (quad channel) for D/A cards.
    WHITEPAPER: The Importance of Signal Isolation (Log in to view the file)
    Learn How to Recognize the Need for Isolation Learn how to recognize the need for isolation in this easy to understand white paper. This paper covers the basic aspects of electrical isolation, what it does for you, why you need it, and how we test for it. Common Methods Of Signal Isolation So the real...
  • Specs & Data Sheets

    Manuals

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

  • Accessories

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      • 19" rack-mount kit with DIN rail
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      Select options
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      DIN Rail: Type T

      • DIN Rail Strip, Type T
      $15$25
      Select options
    • 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
      $95$245
      Select options
    • Compare

      Terminal Block Replacements

      • Simplifies wiring connections on Acromag I/O Modules
      • Barrier strip or spring clamp terminal block kits
      • Provide safe and secure wiring connections
      $30$40
      Select options
  • Additional information

    Additional information

    Weight 8 oz
    Dimensions 12 × 13 × 3 in
    Part Number

    TBK-B01: two 6-position barrier strip style, TBK-B02: four 6-position barrier strip style, TBK-B03: one 3-position and three 6-position barrier strip style, TBK-S01: two 6-position spring clamp style, TBK-S02: four 6-position spring clamp style, TBK-S03: one 3-position and three 6-position spring clamp style