Standard Electric Works LS-110 DC Ammeter 1mA (50DIV)

Standard Electric Works LS-110 DC Ammeter | Moving Coil 1mA (50DIV)

The Standard Electric Works (SEW) LS-110 DC Ammeter is a heavy-duty, switchboard-class 4.5-inch square analog panel instrument engineered around a rugged taut-band/pivot-and-jewel permanent magnet moving coil (PMMC) mechanism. Designed specifically for high-reliability marine switchboards, power distribution cubicles, and industrial control consoles, this instrument is calibrated for a 0–1 mA DC full-scale input deflection resolved across a high-legibility 50-division linear scale.

Operating on direct current excitation, the LS-110 offers intrinsic electromagnetic shielding within an impact-resistant, flame-retardant enclosure designed to withstand continuous marine machinery space vibration, high humidity, and wide ambient temperature excursions. Whether deployed as a direct low-current indicator, scaled against an external transducer (such as a 4–20 mA loop with precision dropping shunt), or paired with standard external current shunts, the LS-110 provides instantaneous, drift-free analog indication with zero electronic latency.

Technical Specifications

Key Features

1. High-Torque PMMC Mechanism: Built with a shielded Alnico magnet system that resists external stray magnetic fields common to high-amperage switchboards.
2. Linear 50-Division Scale: 0–1 mA span divided evenly across 50 increments (0.02 mA/div) for precise visual interpolation without parallax ambiguity.
3. Standard 4.5″ ANSI Switchboard Footprint: Drop-in dimensional interchangeability for marine generator panels, main switchboards (MSB), and emergency switchboards (ESB).
4. Mechanical Shock & Vibration Damping: Jewel bearings and viscous magnetic damping eliminate needle jitter caused by auxiliary diesel engines and marine propulsion vibrations.
5. Front-Accessible Zero Calibration: Integrated mechanical screw adjuster on the lower front bezel allows on-site zero compensation without opening the case.

Applications

• Marine Main & Emergency Switchboards: DC busbar ground leakage detection, exciter field current monitoring, and battery charger status panels.
• Process Instrumentation Readouts: Direct output loop monitoring from 0–1 mA current output transducers (temperature transmitters, flow meters, tachometer generators).
• Industrial Battery Banks & UPS Systems: Floating charge current and discharge monitoring on emergency backup power plants.
• Cathodic Protection Systems: Continuous DC current draw verification for marine hull and subsea piping impressed current cathodic protection (ICCP).
• High-Voltage Rectifier Stations: Secondary current feedback indication for DC traction substations and galvanic plating lines.

Compatible Equipment Models

• Marine Main Switchboard Enclosures: Terasaki, Nishishiba, Hyundai Heavy Industries (HHI), Schneider Electric MasterPact series consoles.
• Automation & Engine Control Consoles: Kongsberg, ABB, Siemens SISHIP, Deif marine generator control systems.
• Transducers: Any commercial loop transmitter or passive dropping circuit supplying 0–1 mA DC full scale.

Direct & Functional Part Number Cross-References

• Yokogawa: 250-210 Series (0–1 mA DC, 4.5″ switchboard format)
• General Electric (GE): Type AB-16 / AB-40 (0–1 mA DC movement)
• Westerberg / Crompton Instruments: Model 007-05 / 244-01A (0–1 mA DC Indicator)
• Wega / Simpson: Model 1145 / 524 4.5-inch series
• SEW Alternative Model Codes: LS-110-1MA, LS110DC1MA/50DIV

Frequently Asked Questions

What does 1mA (50DIV) mean on the LS-110?

It signifies that the meter reaches full-scale needle deflection (FSD) when exactly 1 milliampere (0.001 A) of direct current flows through its internal coil. The scale face is marked with 50 equal divisions, giving each division an exact measurement value of 0.02 mA DC.

Can this meter be used on an AC circuit?

No. The LS-110 is a permanent magnet moving coil (PMMC) instrument designed exclusively for DC measurements. Applying AC current directly will cause the pointer to vibrate rapidly around zero without indicating value, and sustained AC current at elevated levels will damage the suspension system.

How does the LS-110 mount into an existing control console?

It is engineered for standard flush panel mounting through a circular barrel cutout secured by four corner mounting studs and nuts. It conforms to universal 110 mm x 110 mm (4.5-inch) switchboard standard layouts.

Can the scale face be re-lettered or custom-calibrated?

Yes. Because 0–1 mA is the industry standard input for transducer-driven analog displays, the scale face can be interchanged or customized with engineering units such as 0–100%, RPM, Bar, Amperes, or Volts without changing the basic 1 mA physical movement.