1. General Description & Purpose

️· The 47NLDY is a panel-mounted digital panel meter for displaying and monitoring industrial process variables.
️· It accepts a 4-20mA input signal (representing a process variable like flow, pressure, or temperature) and displays the value.
️· It includes alarm functions (High/Low) and various display modes (min/max, engineering units).
️· It can be powered by 24V DC.

2. Key Features

️· Input: 4-20mA DC current signal.
️· Display: Digital display, potentially with a sticker label for engineering units.
️· Alarm Functions: High (H) and Low (L) alarms with indicator lights (Green for L, Red for H, Amber for no alarm or selected alarm point).
️· Display Modes: Various modes including display of minimum, maximum and process values
️· Engineering Units: Supports a wide range of engineering units (DC, AC, mV, V, μA, mA, °C, %RH, m/s, etc.) through sticker labels.
️· Power: 24V DC power supply.
️· Alarm Relays: Photo MOSFET relay output.
️· Protection: Short circuit protection (current limited to 35mA).
️· Mounting: Can be panel-mounted (screw) or mounted with magnets.
️· IP Rating: Panel mount has IP66 rating

3. Technical Specifications

️· Input Range: 4.00 - 20.00 mA DC (Conformance range: -20% to +120% of this range).
️· Output: 24 - 28 V DC (max. no load), 18 V DC (min. at 20mA load)
️· Current Rating: ≤ 22 mA DC.
️· Accuracy: ±0.1% ± 1 digit (for input within 1-100% of the range, with square root extraction).
️· Response Time: ≤ 0.5 seconds (for alarm output).
️· Operating Temperature: -10 to +55°C (14 to 131°F).
️· Operating Humidity: 10 to 90% RH (non-condensing).
️· Dimensions: 96.0 mm (width). (Height and depth are not specified but are implied by the mounting options).

4. Mounting Options

️· Panel Mounting: Uses screws (specified M4 screws). Requires a waterproof packing for IP66 protection.
️· Magnetic Mounting: Uses magnets (no panel cutout required).

5. Connection Diagram

️· The document shows a block diagram of the internal circuitry:
- 24V DC Power Supply
- A/D Converter
- Short Circuit Protection
- Digital Computation/Display
- 2-wire Current Input connection (representing the process variable)
- Alarm Output Connections

6. Regulatory Compliance

️· EU EMC Directive
️· RoHS Directive.

In essence, the 47NLDY is a versatile and reliable panel meter designed for industrial applications requiring accurate monitoring of process variables and alarm functionality.