Portable Voltage Indicator — LRM-ST
The LRM-ST from HORSTMANN is a portable voltage indicator for capacitive single-pole coupling to live parts. The device is intended for low-impedance systems and indicates voltage presence via a blinking LED. The function and technical data have been verified on the manufacturer's product page.Function and Construction
The LRM-ST operates with capacitive single-pole coupling and does not require a direct connection to the live part. The device has an input impedance of 2.0–2.4 MΩ and a response voltage (Ut) of 4–5 V. The display indicates voltage by a blinking LED with a blinking frequency of ≥1 Hz. The circuit is embedded in epoxy/potting compound, and the housing is made of polycarbonate with an IP54 protection class. The device is suitable for operation at 50 Hz.Typical Applications
- Used for capacitive single-pole coupling to live parts.
- Suitable for checking the presence of voltage in low-impedance systems.
- Can be used in permanent installation on a suitable plug-in module when specified by the manufacturer.
Operating Conditions and Maintenance
The operating temperature range is -25 °C to +55 °C. The device requires no battery supply, and the electronics are fully encapsulated for increased functional reliability under varying atmospheric conditions. The LRM-ST is covered by the periodic inspection scheme and must undergo maintenance testing every 6 years according to DGUV Rule 3.Specifications
- Product Name: LRM-ST.
- Manufacturer: HORSTMANN.
- Type: Portable voltage indicator (capacitive, single-pole coupling).
- Response Voltage (Ut): 4–5 V.
- Input Impedance: 2.0–2.4 MΩ.
- Blinking Frequency: ≥1 Hz (at response voltage).
- Rated Frequency: 50 Hz.
- Enclosure: Polycarbonate, IP54.
- Circuitry: Waterproof encapsulation (cast resin).
- Operating Temperature: -25 °C to +55 °C.
- Maintenance: Periodic test every 6 years according to DGUV Rule 3.
- Compliance: IEC 62271-213 and IEC 61243-5 (stated by manufacturer).
- Source: Manufacturer's product page (HORSTMANN).
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