Hochiki ESP Intelligent Marine Approved Dual Zone Monitor with SCI (CHQ-DZM/M(SCI))

The Hochiki CHQ-DZM/M(SCI) is a marine-approved dual zone monitor with an integral short-circuit isolator (SCI) for the Hochiki ESP analogue addressable system. It lets up to 60 conventional detectors (30 on each zone) be connected to an ESP loop, and is approved to MED by DNV for use on ships and similar marine applications. A Schottky diode line continuity option is available in resistive mode with the optional LCMU. Addressing is by DIL switches.

Key features

• Approved to MED by DNV
• Single loop address, set by DIL switches
• Two independent zones of conventional detectors
• Both zones fully monitored for short and open circuit
• Self-test through the ESP protocol
• Integral short-circuit isolator
• Requires an auxiliary 24 VDC power supply
• Can be used with CHQ-BACKBOX to comply with BS 7671
• SIL2 variant available

Technical specifications

• Ordering code: CHQ-DZM/M(SCI)
• Operating voltage: 17 to 41 VDC
• Low power mode: 110 µA (typical)
• Quiescent current: 330 µA (typical)
• External supply current: 2 mA quiescent, 70 mA with both zones in alarm
• Zone capacitance: 0.3 µF maximum; zone resistance: 50 Ω maximum
• Current in short circuit: 8 mA; maximum short-circuit current (loop): 1 A
• Zone output voltage: 15.3 to 17.1 V
• Remote indication output rating: 24 VDC, 8.5 mA
• End-of-line options: TE-RH-E (supplied), 6K8 resistor or LCMU (6K8) (not supplied)
• Detectors per zone: up to 30 of the SLG, SLK, SLR, SIF, SIH, SIJ, DCC, DCD and DFJ types; up to 15 DRD-E; see datasheet for other types
• Operating temperature: -10 °C to +50 °C
• Storage temperature: -30 °C to +60 °C
• Weight: 350 g (585 g with lid and back box)
• Dimensions: 157 x 127 x 35 mm with lid; 79 mm deep with lid and back box
• Approvals: DNV rules for classification (ships); IMO FSS Code chapter 9; location classes temperature B, humidity A, vibration A, EMC B