Voltage indicator BL-I 10kV optical + acoustic COMET

Comet BL‑I – Single-Pole Capacitive Voltage Detector

This Comet BL‑I from HORSTMANN is a single-pole, capacitive voltage detector for indoor (dry) use. The device indicates the presence of operating voltage optically with red and green LEDs; the optical-and-acoustic variant also adds a buzzer for audible indication.

Function and Construction

The Comet BL‑I is designed as a single-pole meter with an integrated self-test that checks the circuit, including the contact electrode, before each use. Power is supplied by two lithium cells, and the manufacturer specifies an operational readiness time of six years under the specified usage conditions.

• Indication: optical (red/green LED); optical + acoustic (buzzer) for the acoustic variant.
• Integrated self-test, including contact electrode.
• Power supply: 2 lithium cells.

Typical Applications

Use of the Comet BL‑I includes determining whether a conductor is live, with clear indication of "voltage present" or "no voltage". According to the manufacturer's product text, the Comet series is used for maintenance, installation, and troubleshooting where a simple and verifiable voltage indicator is required.

Documentation

Further technical information and a model overview can be found on the manufacturer's product page. See manufacturer's product page

Specifications

• Product: Comet BL‑I (optical and optical-and-acoustic variant).
• Manufacturer: HORSTMANN.
• Manufacturer's item number (10 kV, optical-and-acoustic): 50-0903-009.
• Rated voltage / model indicated in manufacturer's table: 10 kV (for this product line).
• Total length (10 kV model): 1,270 mm.
• Immersion depth (10 kV model): 462 mm.
• Indication: red and green LED; buzzer for acoustic variant.
• Integrated self-test, including contact electrode check.
• Power supply: 2 lithium cells; 6 years operational readiness (according to manufacturer's assumptions).
• Standard references: IEC 61243-1 (VDE 0682-411), category S (indicated by manufacturer).
• Operating range (operating temperature): -25 °C to +70 °C (indicated by manufacturer).

Sources

• HORSTMANN Comet series – product page

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