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Product short description:
  • 100 ohm Pt, 120 ohm Ni, 10 ohm Cu (selectable type) input
  • 4 to 20mA DC output
  • 12-50V DC from output loop power
  • DIP-switch configuration, push-button calibration
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Models:
657T: Single RTD input channel
658T: Dual RTD input channels

These units accept universal RTD or resistance input signals and output proportional DC current signals. The output can also be linearized to the input sensor signal. Single-channel 657T and dual-channel 658T units are ideal for panel shops and end-users who require a high-density signal conditioner that can accommodate a broad range of temperature measurement applications.

Configuration is fast and easy. First, you select the input type with a simple DIP switch. Then, you set your zero/full-scale output values using a toggle switch on the front panel to increase or decrease the signal until you read the desired output value on your voltmeter. The toggles make it easy to calibrate a normal (proportional) or reverse-acting (inverse) response in seconds. After completing the calibration, just press the mode/set toggle and your configuration settings are safely saved to nonvolatile memory.

Input Ranges:
RTD: 100 ohm Pt, 120 ohm Ni, 10 ohm Cu
Resistance: 0 to 500 ohms
Output Range: 4 to 20mA DC
Power Requirement:
12 to 50V DC (loop-powered)
Two-wire transmitter
Approvals:
UL, cUL listed
Class I; Division 2; Groups A, B, C, D

Performance Specifications

General Input

Analog to Digital Converter (ADC): 16-bit S-D A/D converter
Noise Rejection:
Normal Mode: Better than 40dB @ 60Hz
Common Mode: Better than 100dB @ 60Hz
Input Overvoltage Protection: Bipolar Transient Voltage Suppressors (TVS)
Input Impedance: 400K ohm at 10mV span; input current, ±25nA, typical (±30nA, max.)

RTD Input

RTD Input Ranges: 100 Ohms, 120W Ni, or 10W Cu; user-configured.

RTD                °C Range (°F Range)                    Accuracy
Pt1        -200 to 850°C (-328 to 1562°F)               ±0.25°C
Pt2        -200 to 850°C (-328 to 1562°F)               ±0.25°C
Ni             -80 to 320°C  (-112 to 608°F)                 ±0.25°C
Cu        – 200 to 260°C (-328 to 500°F)                 ±1.00°C
Alpha: Pt1 (a = 1.3850), Pt2 (a = 1.3911), Ni a = 1.6720), Cu (a = 1.4272)

2, 3, or 4-wire configurations supported. Module provides sensor excitation, linearization, lead-wire compensation, and sensor break detection.
RTD Excitation Current: 0.5mA DC typical, all types
RTD Lead-Wire Compensation: 25 ohms per lead
RTD Break Detection: Configurable for either upscale or downscale

Resistance Input

Resistance Input Range: 0 to 500 ohms
Resistance Accuracy: ±0.05 ohms

Output

Output Range: Range: 4 to 20mA DC, 3.8 to 22mA range typical
Output Compliance: Rload = (Vsupply – 12V) / 0.02A
Output Response Control: Proportional/inverse selectable
Ambient Temperature Effect: Better than ±0.006% of input span per °C or ±100ppm/°C, whichever is greater
Output Response Time (for input step change): 700mS typical to 98% of final output value

Environmental

Ambient Temperature:
Operating: -25 to 75°C (-13 to 167°F)
Storage: -40 to 85°C (-40 to 185°F)
Relative Humidity: 5 to 95%, non-condensing
Power Requirement: 12 to 50V DC @ 25mA for each output channel
Isolation: Not isolated
Radiated Field Immunity (RFI): Complies with EN61000-4-3 Level 3 and EN50082-1
Electromagnetic Field Immunity (EMI): Less than ±0.25% of output span effect
Electrical Fast Transient (EFT): Complies with EN61000-4-4 Level 3 and EN50082-1
Electrostatic Discharge (ESD): Complies with EN61000-4-2 Level 3 and EN50082-1
Radiated Emissions: Meets or exceeds EN50081-1 for Class B equipment
Approvals:
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 #12-24
Printed Circuit Boards: Military grade FR-4 epoxy glass circuit board
Dimensions:
1.05W x 4.68H x 4.35D inches
26.7W x 118.9H x 110.5D millimeters
Shipping Weight: 1 pound (0.45 Kg) packed

  • Selectable RTD input types offer flexibility to fit many applications
  • DIP switch-configuration and self-ranging technologies speed installation without pots, jumpers, or software
  • Toggle-switch calibration simplifies field adjustments for faster and easier maintenance
  • Configuration lockout safety feature prevents tampering and accidental changes
  • Reverse-acting output capability enables inverse proportional control signals
  • Dual channel model saves space and reduces equipment costs
  • High-resolution sigma-delta A/D converters deliver superior accuracy for reliable measurements
  • Lead break detection supports upscale or downscale fail-safe mode
  • Operating temperature range: -25 to 75°C (-13 to 167°F)

Manuals

657T, 658T 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

    • Selectable RTD input types offer flexibility to fit many applications
    • DIP switch-configuration and self-ranging technologies speed installation without pots, jumpers, or software
    • Toggle-switch calibration simplifies field adjustments for faster and easier maintenance
    • Configuration lockout safety feature prevents tampering and accidental changes
    • Reverse-acting output capability enables inverse proportional control signals
    • Dual channel model saves space and reduces equipment costs
    • High-resolution sigma-delta A/D converters deliver superior accuracy for reliable measurements
    • Lead break detection supports upscale or downscale fail-safe mode
    • Operating temperature range: -25 to 75°C (-13 to 167°F)
  • Specs & Data Sheets

    Manuals

    657T, 658T User Manual (Log in to download the file)

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      $10$20
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      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
      $25$35
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  • 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