Description
The Eaton Durant 57701-451 is a \frac{1}{8} DIN-cutout, panel-mounted digital process meter and ratemeter from the Eclipse Series. It acts as a localized display and alarm unit that converts analog process signals—such as 4–20 mA or 0–10 V DC loop variables—into a highly accurate, scalable 5-digit LED readout. Operating from a universal AC input, this unit supplies integrated 24 V DC loop power to feed connected external field transmitters and incorporates dual Form C relay outputs for local limit alarms or control sequencing.
Commercial Availability & Procurement Terms
- Condition: New Original (Factory Sealed Vintage Stock / New Surplus)
- Lifecycle Status: Discontinued by OEM; available as a maintained spare part
- Warranty: 12-Month Functional Warranty
- Availability: In Stock
- Standard Lead Time: Ships within 1–2 business days via global couriers (DHL, FedEx, UPS)
- Pricing Policy: Indicative pricing only. Price fluctuates based on secondary market allocation metrics and remaining warehouse quantities. Contact our sales department for a formal, time-bound quote.
Technical Specifications
| Parameter | Specification / Value |
| Model Number | 57701-451 |
| Product Series | Eclipse Series |
| Original Brand | Durant / Cutler-Hammer / Eaton |
| Panel Cutout Size | \frac{1}{8} DIN (92 mm \times 45 mm) |
| Input Power Range | 85 to 265 V AC, 47 to 63 Hz |
| Integrated Loop Supply | 24 V DC output for auxiliary transmitter power |
| Supported Analog Inputs | 4–20 mA, 0–20 mA, 0–10 V DC, 1–5 V DC |
| Display Type | 5-Digit Red LED, 14 mm (0.56 in) digit height |
| Memory Buffer | Non-volatile EEPROM (No backup battery required) |
| Sensor Configurations | NPN Sink or PNP Source, DIP switch selectable |
| Control Outputs | 2 \times Form C (SPDT) relays, rated for AC load handling |
| Front Bezel Protection | NEMA 4X / IP65 when mounted with factory rubber gasket |
| Operating Temperature | 0 to +50 °C (+32 to +122 °F) |
| Compliance/Certifications | UL listed, cUL listed, CE marked |
Deployment Constraints & Engineering Notes
1. Scaling Realities via Internal Software
The 57701-451 is fully field-scalable via front-panel pushbuttons, allowing engineering units (such as PSI, GPM, or °C) to align with baseline electrical signal scales.
Field Warning: Ensure input impedance settings are correctly matched using the rear dip switches before driving loops. Forcing a 4–20 mA current loop into a channel configured for a 0–10 V DC voltage matrix will bypass the protective shunt resistor and can burn out the input signal filtering path.
2. Physical Depth and Panel Enclosure Fit
While the bezel matches a standard \frac{1}{8} DIN configuration, the housing requires substantial interior clearing space behind the panel plate.
- Clearance Rule: Allow a minimum horizontal depth profile clearance of 120 mm behind the mounting surface to prevent severe wire fatigue or terminal strain against the removable rear block plugs.
- Gasket Integrity: To maintain the NEMA 4X environmental seal against washdown spray or ambient oil mist, the panel face cut must be completely deburred and clean of imperfections before compressing the foam-in-place seal.
3. Loop Power Sourcing Limits
The onboard 24 V DC voltage tap is designed strictly to drive the current excitation loop of low-draw 2-wire pressure, level, or temperature sensors. It cannot be used as a general cabinet power supply to drive heavy external logic relays or audible annunciators. Exceeding its milliamp rating will induce thermal shutdown in the meter’s internal transformer.
Frequently Asked Questions
Is the Eaton 57701-451 backwards-compatible with older legacy Durant counters?
It acts as a physical drop-in for standard \frac{1}{8} DIN holes utilized by older Durant instruments. However, the internal programming registers, menu parameters, and back-terminal pin-outs differ from mechanical or early digital counter variants. You must map out and rewire the terminal connections based on the current Eaton Eclipse wiring schematics.
What happens if the display shows an “OFL” or “UFL” alarm message?
An “OFL” represents an Overflow condition, meaning the current flowing through the sensor circuit is higher than the programmed max threshold, or the input loop wire has shorted directly to a higher voltage rail. Conversely, a “UFL” means Underflow, typically pointing to a broken wire path on a 4–20 mA loop where baseline signal drops below 4 mA.
Can this unit execute PID closed-loop control functionality?
No. The 57701-451 is a process indicator with high/low alert capabilities. The dual Form C internal relays act as simple threshold-triggered on/off switches. If your application requires proportional-integral-derivative (PID) modulation for mechanical flow valves or heating elements, you must use a dedicated process controller rather than a standard panel meter.
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