These units accept DC voltage input signals, provide isolation, and output proportional DC current signals. With two independent I/O channels in a slim package, the 654T is ideal for panel shops and end-users who require a high-density signal conditioner that can cover a broad range of measurement applications. Configuration is fast and easy. First, you select the input range for each channel with simple DIP switches. Then, you set your zero/full-scale output values using the non-interactive increase/decrease toggle switches on the front panel to modify the output signal until the desired output value is read on your voltmeter. The switches make it easy to calibrate a normal proportional) or reverse-acting (inverse) response in seconds. After setting the desired calibration, you can engage the safety lockout feature on the DIP switch to prevent accidental changes and unauthorized tampering. The 654T provides two independent high-voltage input isolation circuits. Loss of power or a failure on one channel has no effect on the other. The second channel can be used as a built-in spare for reduced downtime should the first channel fail. The spare channel becomes operational by simply moving the wired terminal block over to the vacant channel. Input Ranges: Bipolar: ±78mV to ±625mV (selectable ranges) Unipolar: 0–1.25 to 0–10V DC (selectable ranges) 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 Σ-Δ A/D converter Noise Rejection: Normal Mode: Better than 40dB @ 60Hz with 100 ohm input unbalance. Common Mode: Better than 140dB @ 60Hz with 100 ohm input unbalance. Input Over-voltage Protection: Bipolar Transient Voltage Suppressors (TVS)

DC Voltage Input

Input Range DIP switch-selectable. See table below. Input                        Recommended Range                  Minimum Span (10%) A) ±78mV                          15mV B) ±156mV                        31mV C) ±313mV                        62mV D) ±625mV                     124mV E) 0 to 1.25V                  125mV F) 0 to 2.5V                     250mV G) 0 to 5V                        500mV H) 0 to 10V                   1000mV Span adjust: See table above. Zero adjust: 100% full range Input Impedance: 110K ohms, typical


Output Range: Range: 4 to 20mA DC, 3.8 to 24mA range typical. Output Compliance: Rload = (Vsupply - 12V) / 0.02A 600 ohms at 24V DC supply Output Response Control: Proportional/inverse selectable. Ambient Temperature Effect: Better than ±0.018% of input span per °C (±0.01% per °F) Output Resolution: Output resolves to 1 part in 6546 for the nominal 4 to 20mA output span. Output Response Time (for input step change): 980mS typical to 98% of final output value. Accuracy (overall input to output): ±0.1% of output span.


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: 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): Designed to comply 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 (2KV) and EN50082-1 Electrostatic Discharge (ESD): Complies with EN61000-4-2 Level 3 (8KV air or 4KV direct) 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


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

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    654T: Dual DC Voltage Input, Loop-powered Transmitter

    • 2 channels, ±625mV, 0-10V DC (selectable ranges) input
    • 4 to 20mA DC output
    • 12-50V DC power from output loop
    • Dual-channel transmitter with push-button calibration
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