What is included in the solution?
Unlike spot sensors that only see one point, the NA04AA film runs along a route – around CRAC units, along chilled-water pipes under raised floors, inside AHU/FCU drain pans. Leak and cable-break signals for each zone are provided on 6 NPN open-collector outputs to the BMS / DDC / PLC, so operators can locate and act before water shorts power, damages IT equipment or stains ceilings.
|
Component |
Code |
Function |
Quantity rule |
Type |
|
Film water leak sensor cable |
NA04AA |
Detects conductive liquid along its length |
Per metre – total zone length |
Required |
|
3-channel controller |
NB03AA |
Reads resistance, leak/break alarm, 6 NPN outputs to BMS |
1 per 3 zones |
Required |
|
START connector |
NC03AA |
Zone start, pre-wired cable to controller |
1 per zone |
Required |
|
END connector |
NC05AA |
Zone end termination |
1 per zone |
Required |
|
24 VDC power supply |
SMPS 24VDC |
Powers the controllers, DIN-rail in panel |
≥ 24 VDC / 1 A (per NCT); size up for multiple controllers |
Required |
|
Link (corner) connector |
NC02AA |
90° turns at corners/bends |
Per corner on the route |
Optional |
|
Flexible link connector |
NC06A |
Bridges columns, beams, gaps – adjustable cable |
Per obstacle crossing |
Optional |
|
SUS / PVC sensor protective case |
NF01A-C / NF02A-C |
Protects film outdoors, in dusty or impact areas |
Per protected section (200–2,000 mm) |
Optional |
|
Connector case / sensor cover |
NF04A / NF05A |
Protects connectors; covers film in walkways |
As required |
Optional |
|
Compact 24 VDC UPS |
NF07A |
Keeps leak monitoring alive during outages |
1 per panel |
Optional |
|
Control & alarm panel |
ND01AA |
Houses controllers, beacon/siren, WCDMA/RS-485/RF comms |
Per area / zone count |
Optional |
Required items form the minimum working configuration; Optional items are selected to suit site conditions.
How it works
-
NA04AA carries parallel electrodes; when a conductive liquid bridges them the resistance drops – NB03AA detects it and activates that channel's alarm (steady LED).
-
NB03AA also supervises loop continuity: a broken cable or loose connector is reported separately (blinking LED) on a dedicated fault output.
-
Each NB03AA handles 3 independent zones; add units on the DIN rail to expand. After an event, dry the film and press RESET to return to monitoring.
Typical applications
-
Server rooms & data centres: raised floors, around CRAC/CRAH and in-row coolers, chilled-water routes
-
Chiller plant rooms, pump rooms, riser shafts
-
AHU, FCU and PAU drain pans; condensate piping above ceilings
-
Electrical, UPS/battery and telecom rooms with pipes passing through
-
Water tanks, basins, water treatment rooms, floor drains
-
Archives, museums, cleanrooms, hospitals
Benefits for contractors & owners
-
Route-based detection covers the whole area – no blind spots between point sensors
-
Separate leak and cable-break signals per zone – BMS knows exactly which zone to act on
-
Thin 580 µm, 25 mm wide PET film – low profile on floors and under raised floors
-
No exposed metal electrodes – corrosion resistant, long life, reusable after drying
-
22.5 mm DIN-rail controller fits existing BMS/DDC panels
-
S-Mark, CE, KC certified; genuine NCT supplied by DLK
Technical specifications
NA04AA film-type water leak sensor cable
|
Parameter |
Value |
|
Part number |
NA04AA |
|
Type |
Film-type (flat) sensor, detects along its full length |
|
Detectable substances |
All conductive liquids: water, condensate, chilled water, water-glycol, etc. (other substances: contact us) |
|
Dimensions |
Width 25 mm / Thickness 580 µm |
|
Operating temperature |
-30 to 100 °C |
|
Material |
PET |
|
Features |
Non-metallic sensing elements – better corrosion and chemical resistance than conventional metal cables; reusable after drying |
|
Sales unit |
Per metre (cut to zone length) |
|
Precaution |
Not a standalone unit – use with NB03AA controller and NC03AA / NC05AA connectors |
NB03AA 3-channel leak sensor controller
|
Parameter |
Value |
|
Part number |
NB03AA |
|
Channels |
3 sensor channels, independent alarm per channel |
|
Dimensions / mounting |
22.5 (W) × 99 (H) × 111.5 (D) mm – DIN-rail mount |
|
Power supply |
24 VDC, 200 mA (SMPS ≥ 24 VDC / 1 A recommended) |
|
Outputs |
6 × NPN open-collector outputs (normally closed): 3 leak + 3 cable-break |
|
Sensor input range |
100 kΩ to 7,000 kΩ |
|
Indication |
Per-channel alarm LED: steady = leak, blinking = cable break; status LED |
|
Operating temperature |
-30 to 100 °C |
|
Housing material |
PP |
|
Certifications |
S-Mark, CE, KC |
Sensor connectors
|
Code |
Type |
Dimensions |
Notes |
|
NC03AA |
START connector (for NA04AA) |
55.5 × 18 × 12.6 mm |
Supplied with cable to NB03AA controller |
|
NC05AA |
END connector (for NA04AA) |
55.5 × 18 × 12.6 mm |
End of zone, no cable |
|
NC02AA |
Link (corner) connector |
75 × 75 × 12.6 mm |
For corners/bends; compatible with leak and chemical sensors |
|
NC06A |
Flexible link connector |
55.5 × 18 × 12.6 mm × 2 |
Adjustable intermediate cable – crosses columns, beams, gaps; compatible with leak and chemical sensors |
Material PVC, operating temperature -30 to 100 °C.
Protective accessories & backup power (optional)
|
Code |
Name |
Material |
Dimensions / data |
Purpose |
|
NF01A / NF01B / NF01C |
Sensor protective case (SUS) |
SUS (inox) |
115 × (200–500 / 501–1,000 / 1,001–2,000) × 50 mm |
Film installed inside; liquid entering through the bottom is detected – mechanical, dirt and outdoor protection |
|
NF02A / NF02B / NF02C |
Sensor protective case (PVC) |
PVC |
115 × (200–500 / 501–1,000 / 1,001–2,000) × 50 mm |
For areas where metal cannot be used – especially highly corrosive chemical areas |
|
NF04A |
Connector protective case |
SUS |
70 × 80 × 50 mm |
Protects connectors from environmental factors and impact |
|
NF05A |
Sensor protective cover |
SUS |
40 × 15 × 2,400 mm, 1.2 mm thick |
Cover over the film, fixed with saddles; label on top – for walkways and trolley areas |
|
NF07A |
UPS – compact 24 VDC model |
— |
84 × 72 × 42 mm; 14.4 V × 3,000 mAh; I/O 24 V (±10%); 400 g |
Panel-mounted 24 VDC backup for controllers (KC, CE) |
|
NF06A |
UPS – standard model |
— |
101 × 279 × 142 mm; 12 V / 7 Ah; I/O 220 VAC (±10%, 50/60 Hz); 4.2 kg |
Keeps the alarm system running during outages (KC, CE) |
Wiring & system integration
NB03AA terminal assignment
|
Terminal block |
Pin |
Function |
|
1–4 |
1 / 2 |
P24V (+24 VDC) / N24V (0 V) |
|
1–4 |
3 / 4 |
CH1 SENSOR + / – |
|
5–8 |
5 / 6 |
CH2 SENSOR + / – |
|
5–8 |
7 / 8 |
CH3 SENSOR + / – |
|
9–12 |
9 |
COM (cable-break outputs) |
|
9–12 |
10 / 11 / 12 |
Sensor damage / cable-break alarm CH3 / CH2 / CH1 |
|
13–16 |
13 |
COM (leak outputs) |
|
13–16 |
14 / 15 / 16 |
Leak alarm CH3 / CH2 / CH1 |
Per NCT documentation the sensor terminals are not polarity-sensitive; always verify +/– of the 24 VDC supply before powering up.
BMS / PLC integration
|
Signal |
Output |
To BMS / DDC |
Suggested point name |
|
Leak zone 1–3 |
NPN open collector, NC (pins 14–16, COM 13) |
DDC/PLC digital input (DI), sinking, common 0 V |
LD-Zx-ALM (Leak Alarm) |
|
Cable break / sensor fault zone 1–3 |
NPN open collector, NC (pins 10–12, COM 9) |
Digital input (DI) |
LD-Zx-FLT (Cable Fault) |
|
Controller power loss |
NC logic – output opens on fault |
BMS sees DI state change |
Configure loss-of-signal alarm |
Engineering note: outputs are NPN transistors, not dry contacts. If the DDC DI module only accepts voltage-free contacts or a different voltage level, add a 24 VDC interposing relay per point. Total 6 DI points per NB03AA (3 leak + 3 fault).
Installation & operation notes
-
Clean and dry the floor before sticking the film (dust and sand reduce adhesion); never install a contaminated sensor.
-
Route the cable at the lowest point following the water path; avoid locations directly under cold supply air where condensation causes nuisance alarms.
-
Insert the film into the connector so the coated electrode firmly contacts the alloy contact (between electrode and rubber seal), then tighten the screws.
-
Wire the START connector to the NB03AA sensor terminals, apply 24 VDC with correct polarity; on first power-up press RESET (with a pin) to initialise.
-
Peel the transparent liner from the back of the sensor after assembly, then fix it in place.
Quantity take-off example
Example: server room with 3 zones (raised floor 20 m, around CRAC 12 m, drain pan 6 m) and 4 corners
|
Item |
Quantity |
|
NA04AA |
38 m |
|
NB03AA |
1 unit |
|
NC03AA |
3 pcs |
|
NC05AA |
3 pcs |
|
NC02AA |
4 pcs |
|
SMPS 24 VDC ≥ 1 A |
1 unit |
|
BMS DI points |
6 (3 leak + 3 fault) |
Frequently asked questions (FAQ)
Can NA04AA be used on its own?
No. NA04AA requires the NB03AA controller and an NC03AA (START) / NC05AA (END) connector pair for each zone.
How many zones per NB03AA?
Up to 3 zones (3 sensor cables), each with its own leak and cable-break outputs.
How is it connected to the BMS?
Through 6 NPN open-collector (normally closed) outputs into DDC/PLC digital inputs. If the DI needs dry contacts, add 24 VDC interposing relays.
Can a wet cable be reused?
Yes for clean water: dry it, check the film is undamaged and press RESET. Replace the section if it is contaminated or open-circuit.
What about chemical or oil areas?
Use the selective NA01AA (acid), NA02AA (alkali) or NA03AA (oil) cables with the NB01AA controller – see chemical leak sensor and oil leak sensor.
DLK Trading Service Company Limited is NCT's (Nano Composite Technology, Korea) authorized strategic partner in Vietnam. DLK supplies 100% new genuine products with full import documents, and supports contractors and factories with system sizing and BOQ take-off from drawings, wiring, commissioning and signal integration into BMS / SCADA / DCS.
Need a quotation from drawings / BOQ? Send DLK your layout and the list of zones to monitor – DLK engineers will propose the configuration, take off quantities and provide a BMS wiring diagram. Hotline:
+84 93 279 2697 – Sales:
+84 70 357 0101.
Data sources: NCT catalog, NCT Leak Sensor Manual, NCT All Conductive Liquid Sensor Manual, nctech.co.kr. Specifications may change with product revisions – please confirm with DLK before ordering.