Hochiki CHQ‑DZM(SCI) is a dual‑zone conventional detector monitor/interface module for Hochiki ESP analogue addressable loops. It converts two independently monitored conventional zones into a single ESP address, providing full open/short monitoring and an integral short‑circuit isolator. The unit requires an auxiliary 24 V DC supply and is available as an OEM module or as DIN‑rail/boxed variants.

• Key features: Two independent conventional zones; supports up to 60 detectors (typically 30 per zone); short/open circuit monitoring; integral short‑circuit isolator; ESP protocol self‑test and DIL switch addressing.
• Power: Operating voltage 17–41 V DC. Requires auxiliary 24 V DC supply.
• Variants: Standard module, DIN version (CHQ‑DZM/DIN(SCI)), intrinsically safe (IS) and HFP/marine/railway variants — electrical limits and approvals vary by variant.
• Use cases: Interfaces conventional detector loops to Hochiki addressable panels for contractors and fire system installers; useful where two monitored conventional circuits must be reported on a single ESP address.
• Installation & safety: Install only by qualified fire alarm engineers. Verify the exact SKU/variant before wiring. Consult the official datasheet/installation manual for EOL resistor values, maximum zone wiring capacitance/resistance, wiring diagrams and approval details.

Compliance & notes: Approvals and detector counts differ between standard, IS and HFP/marine variants — always confirm the exact model and consult the manufacturer datasheet for certification (e.g., IS/HFP/marine/railway) and UK/CE/UKCA compliance information.