Kentec Sigma ZSi ZXT Extinguishant Status Indicator | 6 LEDs, Remote Indication, Optional Control
Key features
- Monitored RS485 data bus, up to 1200m
- Expandable to 7 status units per system
- Monitored door interlock and hold inputs
Downloads
Summary
The Sigma ZSi range gives you a way to show extinguishing control panel status at every access and egress point around a protected risk area, without running a repeat panel to each door. Each unit reports live status from a Sigma ZXT extinguishing control panel over a monitored data connection, so anyone approaching the risk area can see at a glance whether the system is armed, discharging, or in fault.
View full overview Show less
For you on site, that means fewer callbacks explaining why a door-side indicator doesn’t match the panel, and a straightforward way to satisfy access point warning requirements without redesigning the whole system. The units are certified compliant with BS EN12094-1 (fixed firefighting systems – components for gas extinguishing systems) when paired with Sigma ZXT control equipment, so you can specify them with confidence on gas suppression contracts.
This listing covers the 6 lamp status unit family in surface mount and weatherproof (IP65) enclosures, with or without a mode select keyswitch and dual action manual release, so you can match the exact configuration to each door position on the job.
Features
- Remote status indication – shows the extinguishing panel’s current status at a door or egress point without a second control panel
- Countdown timer display – seven segment LED counts down the seconds to discharge so anyone nearby knows how long they have to clear the area
- Monitored auto/manual door interlock input – automatically switches the system to manual only when a monitored door contact opens
- Monitored hold input – lets an emergency hold button pause the release sequence until the area is confirmed clear
- Monitored RS485 data connection – simple two wire daisy chain link back to the Sigma ZXT panel, over runs of up to 1200 metres
- Optional mode select keyswitch – available on some variants for switching between auto/manual and manual only modes at the door
- Optional dual action manual release – protected pushbutton on some variants activates the release sequence while guarding against accidental operation
- Weatherproof IP65 enclosure option – suits external doors and outdoor risk area access points
FAQ
Can these status units be used with any extinguishing control panel?
The datasheet confirms BS EN12094-1 certified compliance specifically when used with Sigma ZXT control equipment, and the units communicate over the Sigma ZXT’s monitored RS485 data bus. If you’re working with a different manufacturer’s panel, check compatibility with the manufacturer before specifying.
How many status units can I fit on one system?
Up to seven status units can be connected on the monitored RS485 data bus per system. Bear in mind that only a maximum of two status units can be powered directly from the Sigma ZXT’s auxiliary 24V DC output, so additional units will need their own 24V DC supply.
What's the difference between the K-code and W-code models?
The K-prefixed units (K921000M8, K921010M8, K921100M8, K921110M8) are IP30 rated surface mount enclosures for indoor use, while the W-prefixed units (W921000W8, W921100W8, W921110W8) are IP65 rated weatherproof enclosures for outdoor or exposed locations. Within each enclosure type, models differ by whether they include the mode select keyswitch, the manual release pushbutton, both, or neither.
Do I need to fit an end of line resistor on the monitored inputs?
Yes, the monitored door interlock and hold inputs are designed to work with a 6K8 0.5W end of line resistor, with defined normal, trigger and short circuit thresholds given in the specification. Follow the connection diagram in the datasheet when wiring these inputs.
What cable should I use for the RS485 run and inputs?
The terminals accept cable up to 2.5mm² per terminal, and the RS485 data connection is rated for runs of up to 1200 metres. Always check the full installation manual for recommended cable type and any screening requirements before running long data bus lengths.
No, the manual release pushbutton fitted to applicable models uses dual action operation, meaning a single accidental knock won’t trigger a gas release. It’s still a protected pushbutton intended only for deliberate activation of the release sequence.
Specifications
| Construction | 1.2mm mild sheet steel |
|---|---|
| Ip Rating (Standard Unit) | IP30 |
| Ip Rating (Weatherproof Unit) | IP65 |
| Colour | BS 00 A 05 grey – fine texture |
| Weight | 1kg (all units) |
| Power Supply | 21 to 30V DC |
| Maximum Current Draw | 0.07A |
| Quiescent Current | 0.033A |
| Max Number Of Status Units | 7 |
| Cable Capacity | 2.5mm² per terminal |
| Monitored Inputs End Of Line Resistor | 6K8 0.5W resistor |
| Monitored Inputs Normal Threshold | 8K ohm to 1K ohm |
| Monitored Inputs Trigger Threshold | 700 ohms to 100 ohms |
| Monitored Inputs Short Circuit Threshold | 99 ohms to 0 ohms |
| Data Connection | Two wire RS485 connection (max 1200 metres) |
| Operating Temperature Range | -15°C to +35°C |
K921000M8 – 6 lamp status unit surface
| Configuration | No mode select keyswitch, no manual release |
|---|---|
| Size | 190 x 136 x 50mm |
K921100M8 – 6 lamp status unit with mode select keyswitch surface
| Configuration | Mode select keyswitch, no manual release |
|---|---|
| Size | 190 x 136 x 50mm |
K921010M8 – 6 lamp status unit with manual release surface
| Configuration | Manual release, no mode select keyswitch |
|---|---|
| Size | 190 x 136 x 50mm |
K921110M8 – 6 lamp status unit with mode select keyswitch and manual release surface
| Configuration | Mode select keyswitch and manual release |
|---|---|
| Size | 190 x 136 x 50mm |
W921000W8 – Weatherproof 6 lamp status unit
| Configuration | No mode select keyswitch, no manual release |
|---|---|
| Size | 256 x 170 x 60mm |
W921100W8 – Weatherproof 6 lamp status unit with mode select
| Configuration | Mode select keyswitch, no manual release |
|---|---|
| Size | 256 x 170 x 60mm |
W921110W8 – Weatherproof 6 lamp status unit with mode select and manual release
| Configuration | Mode select keyswitch and manual release |
|---|---|
| Size | 256 x 170 x 60mm |
Downloads
- Datasheet (Adobe PDF)
Additional information
| Environment | |
|---|---|
| Mode Keyswitch | No, Yes |
| Manual Release | No, Yes |
| Device Type | |
| Enclosure | |
| System | Sigma ZXT |
