Hochiki CHQ-DIM2 Intelligent Addressable Dual Input Module | 2 Independent Inputs, Integral Short-Circuit Isolator
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Key features
- Two inputs, each NO or NC configurable
- Integral short-circuit isolator saves a loop device
- DIN-rail version for cabinet mounting
Downloads
Summary
The CHQ-DIM2(SCI) dual input module lets you pick up two volt-free contacts, such as a door switch and a sprinkler flow switch, from a single loop address, with each input independently configurable for normally open (NO) or normally closed (NC) operation.
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That independence means you can cover two separate monitoring points on one device instead of running two single-input modules, cutting cable runs, loop addresses and the number of enclosures you need to fit and commission on site.
Both the standard and DIN-rail versions build in a short-circuit isolator (SCI), so you don’t need a separate isolator module to protect the loop from a cable fault. When your fire alarm control panel supports Enhanced mode, the module also adds resistive line monitoring on each input; if the panel doesn’t support it, the device falls back to Compatibility mode and the inputs are no longer monitored, so it’s worth checking panel compatibility before you specify it.
Features
- Two independently configurable inputs - monitor NO or NC contacts such as door switches, sprinkler flow switches or plant equipment from a single device
- Integral short-circuit isolator - protects the loop without fitting a separate isolator module, saving space and parts
- Enhanced mode resistive monitoring - gives full line monitoring on each input when the panel supports it, rather than a simple on/off signal
- DIN-rail version (CHQ-DIM2/DIN(SCI)) - fits straight into a cabinet or plant room enclosure
- Optional CHQ-BACKBOX - raises the enclosure to IP65 for damp or exposed mounting locations
- LPCB approved, with a SIL level 2 approved variant available - supports higher-integrity system specifications
Specifications
| Ordering Code | CHQ-DIM2(SCI) - Module / CHQ-DIM2/DIN(SCI) - DIN Module |
|---|---|
| Operating Voltage | 17 - 41 VDC |
| Quiescent Current (typ) | 280 µA |
| Current Consumption | 22 mA ±20% (polling), 4.3 mA (both inputs active); add 85 µA per input for NC contact monitoring |
| Current In Short Circuit | 8 mA |
| Max Short-Circuit Current (Loop) | 1 A |
| Input Line Resistance | ON threshold <50 Ω, OFF threshold >100 KΩ |
| Operating Temperature Range | -10°C to +50°C |
| Storage Temperature Range | -30°C to +60°C |
| Max Humidity | 95% RH, non-condensing (at 40°C) |
| Weight - CHQ-DIM2(SCI) | 327 g (+235 g with lid and backbox) |
| Dimensions - CHQ-DIM2(SCI) | With lid: L 157 x W 127 x D 35 mm; with lid and backbox: D 79 mm |
| Weight - CHQ-DIM2/DIN(SCI) | 113 g |
| Dimensions - CHQ-DIM2/DIN(SCI) | L 108 x W 119 x D 24 mm |
| Approvals | LPCB approved; SIL level 2 approved variant available |
FAQ
Yes, it’s designed for exactly that kind of application, along with door contacts and plant equipment. Configure the relevant input as NO or NC to match the contact type you’re wiring in. The module regresses into Compatibility mode, where the inputs are no longer monitored for line faults. Check with the panel manufacturer or your Hochiki documentation before relying on resistive monitoring for a project. Yes, the CHQ-DIM2/DIN(SCI) version is designed for DIN-rail mounting, making it a better fit for a plant room cabinet or panel enclosure than the standard enclosed version. Only where you need a higher ingress protection rating; fitting the CHQ-BACKBOX with the standard module raises it to IP65, which suits damp or exposed locations. For a dry indoor cabinet it isn’t necessary. On systems approved to EN54-13, it must be installed next to any Type 1 detection device, with no transmission path between them. Plan your containment layout with this in mind before first fix. Quiescent current is 280 µA, rising to around 22 mA ±20% during polling and 4.3 mA when both inputs are active; add 85 µA per input if you’re monitoring NC contacts. Factor this into your loop budget alongside your other loop devices.Will this module monitor my sprinkler flow switch correctly?
What happens if my fire alarm panel doesn't support Enhanced mode?
Can I mount this inside a control panel cabinet rather than on a wall?
Do I need the back box for every installation?
Where can I position this module relative to detectors?
How much current does it draw from the loop?
Downloads
- Datasheet (Adobe PDF)
Additional information
| Weight | 0.1 kg |
|---|---|
| Version | DIN Rail, Standard |
| Device Type | |
| Environment | |
| Protocol | |
| System Type | |
| Short Circuit Isolator |
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