What is included in the solution?
The NB01AA controller shows real-time values, allows sensitivity tuning per sensor type and site, provides 2 Form C relays for interlocks (pump stop, valve close, beacon) and transmits data via RS-485 Modbus to BMS/SCADA/DCS; optional IoT LoRa sends alerts to phones for unmanned areas.
|
Component |
Code |
Function |
Quantity rule |
Type |
|
Alkali leak sensor cable |
NA02AA |
Selective response to alkali chemicals |
Per metre – per zone length |
Required |
|
2-channel chemical sensor controller |
NB01AA |
Display, alarm, Form C relays, RS-485 Modbus, IoT LoRa |
1 per 2 zones |
Required |
|
Chemical sensor connector |
NC01AA |
Connects the film to the controller |
2 per zone (both ends) |
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 |
|
Master controller |
NB02AA |
Central management of up to 30 NB01AA via RS-485 |
When many NB01AA units are used |
Optional |
|
Corner / flexible link |
NC02AA / NC06A |
Turns and crossings – chemical-sensor compatible |
Per route |
Optional |
|
PVC sensor case (recommended for highly corrosive chemicals) |
NF02A-C |
Protects film where metal is not allowed |
Per section (200–2,000 mm) |
Optional |
|
SUS sensor case |
NF01A-C |
Outdoor and mechanical protection |
Per section |
Optional |
|
Connector case / cover |
NF04A / NF05A |
Connector protection; walkway cover |
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
-
On contact with alkali chemicals the nano-carbon layer of NA02AA changes resistance; NB01AA computes the % versus initial resistance and alarms when the lower/upper limit is crossed (default 80% / 130%).
-
Optional colour-changing cover film marks the contact point – technicians can see the leak location on the route.
-
Periodic auto-calibration compensates temperature and humidity; response data is logged for incident tracing.
NCT smart sensor vs. conventional sensors
|
Criterion |
NCT smart sensor |
Conventional sensors |
|
Response time |
Within 1 second |
Within 60 seconds |
|
Detection threshold |
Below 1% |
50% or higher (varies by chemical) |
|
Minimum detectable volume |
Below 0.5 mL |
5–10 mL |
|
Sensor durability |
Excellent electrode corrosion resistance (carbon-based) |
Prone to corrosion (metal-based) |
Source: NCT catalog – NCT Smart Sensor: Proprietary Detection Mechanism.
Typical applications
-
Caustic (NaOH) dosing for pH control, wastewater treatment, gas scrubbers
-
Pulp & paper, textile dyeing, food & beverage CIP using caustic
-
Semiconductor/electronics: alkaline chemical delivery, NH₄OH, H₂O₂
-
Alkali stores, tanks, bunds, pumps, flanges, valves
-
Laboratories, boiler and cooling-tower water treatment dosing
Benefits for contractors & owners
-
Selective response to alkali chemicals, distinguished from water – fewer false alarms in wet areas
-
Responds within 1 second, detects leaks below 0.5 mL (per NCT catalog)
-
Carbon-based materials resist corrosion – outlasts metal-electrode sensors in chemical environments
-
Flexible 370 µm film installs right at leak-prone points: flanges, valves, tank bottoms, drip trays, under lab benches
-
NB01AA: display, adjustable sensitivity, Form C relays, RS-485 Modbus, IoT LoRa
-
S-Mark, CE, KC certified; technical support by DLK
Technical specifications
NA02AA alkali leak sensor cable
|
Parameter |
Value |
|
Part number |
NA02AA (Alkali Sensor – orange) |
|
Type |
Film-type chemical leak sensor with nano-carbon reactive material |
|
Detectable substances |
Alkalis: NH₃ (ammonia solution), NaOH, KOH, H₂O₂, etc. (other substances: contact us for model selection) |
|
Dimensions |
Width 36 mm / Thickness 370 µm |
|
Operating temperature |
-30 to 100 °C |
|
Material |
PET |
|
Option |
Cover film changes colour at the contact point |
|
Sales unit |
Per metre |
|
Precaution |
Not standalone – use with NB01AA and NC01AA; replace film after chemical contamination |
NB01AA chemical leak sensor controller
|
Parameter |
Value |
|
Part number |
NB01AA |
|
Channels |
Up to 2 sensors (CH1, CH2) |
|
Dimensions |
96 (W) × 66 (H) × 29 (D) mm |
|
Power supply |
24 VDC, 200 mA |
|
Communication |
RS-485 Modbus, 9,600 bps (ID 1–99); IoT LoRa – monitoring and control via mobile app |
|
Relay output |
1 Form C × 2 (one relay per channel), 1 A 24 VDC / 0.5 A 125 VAC |
|
Sensor input range |
1 kΩ to 5,000 kΩ |
|
Display / setup |
4-digit FND display, STATUS / POWER / ALARM1 / ALARM2 LEDs, 4 setup keys; alarm thresholds & auto-calibration as % of initial resistance (default 80% / 130%) |
|
Data |
Real-time value on site, sensor response data logging |
|
Operating temperature |
-30 to 100 °C |
|
Housing material |
PP |
|
Certifications |
S-Mark, CE, KC |
NB02AA master controller
|
Parameter |
Value |
|
Part number |
NB02AA |
|
Function |
Centrally manages up to 30 NB01AA controllers in parallel on RS-485 |
|
Dimensions |
108 (W) × 112 (H) × 35 (D) mm |
|
Power supply |
24 VDC, 200 mA |
|
Communication |
RS-485 Modbus, 9,600 bps |
|
Relay output |
1 Form C, 1 A 24 VDC / 0.5 A 125 VAC |
|
Operating temperature |
-30 to 100 °C |
|
Housing material |
Aluminium (AL) |
Sensor connectors
|
Code |
Type |
Dimensions |
Notes |
|
NC01AA |
Chemical sensor connector (NA01AA/NA02AA/NA03AA) |
55.5 × 18 × 12.6 mm |
Single type (no START/END); each connector cable is wired to NB01AA |
|
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 |
|
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 |
|
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 |
|
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
BMS / SCADA / DCS integration
|
Method |
NB01AA output |
To system |
Notes |
|
Relay contacts |
2 × 1 Form C relays (NO/NC/COM), one per channel; 1 A 24 VDC / 0.5 A 125 VAC |
DDC/PLC DI, beacon/siren, pump trip / valve interlock |
Dry contacts – direct wiring |
|
RS-485 Modbus |
RS-485 Modbus, 9,600 bps, ID 1–99 (parameter P-01) |
BMS/SCADA/DCS via Modbus gateway; read status and resistance/% values (U-01, U-05) |
Multi-drop bus; up to 30 units managed by NB02AA master |
|
IoT LoRa |
LoRa network |
Mobile app – remote monitoring & alerts |
Ideal for unmanned warehouses and remote areas |
Quick setup: P-01 = Modbus address; P-02 = number of sensors (1 or 2); P-10/P-11 = lower/upper alarm limits (% of initial resistance, default 80%/130%); P-12/P-13/P-14 = auto-calibration; recommended display U-05. Detailed Modbus register map: supplied by DLK per project.
Installation & operation notes
-
Confirm the chemical before choosing the part: NA01AA for acids, NA02AA for alkalis; areas with both need separate routes/channels.
-
Place film at the lowest point of the bund, in drip trays under pumps/valves/flanges, along pipe trenches; use PVC case NF02 in highly corrosive areas.
-
Insert film into NC01AA with the electrode between cover and sensing film, check the rubber seal at the connector base, tighten the cover screws.
-
Wire to NB01AA, apply 24 VDC; set P-01 (Modbus ID), P-02 (sensor count), P-10…P-14 (limits & auto-calibration), display U-05.
-
On alarm: identify channel (ALARM1/ALARM2) → P-02 = 0000 → replace film → P-02 = 0001/0002 → P-03 = 0001 to reset.
Quantity take-off example
Example: alkali chemical station with 4 zones (tank bund 2 × 10 m, pump skid 6 m, pipe route 15 m) – 2 NB01AA on one RS-485 bus
|
Item |
Quantity |
|
NA02AA |
41 m |
|
NB01AA |
2 units |
|
NC01AA |
8 pcs |
|
NF02A–C (PVC) |
Per section in corrosive areas |
|
SMPS 24 VDC ≥ 1 A |
1 unit |
|
Signals to DCS/BMS |
4 relay contacts + RS-485 Modbus (ID 1, 2) |
Frequently asked questions (FAQ)
Which chemicals does NA02AA detect?
NaOH, KOH, NH₃ (ammonia solution), H₂O₂… NCT's chemical range also covers organic solvents; for other chemicals contact DLK for model selection and testing.
What if an area has both acids and alkalis?
Use NA02AA for the alkali route and NA01AA (acid) for the other; one NB01AA accepts 2 sensors, so each type can use its own channel.
Will it alarm on a wet floor?
No – NCT's selective material distinguishes water from chemicals, suitable for wash-down areas and humid cleanrooms.
How are signals sent to BMS/DCS?
Each channel has a Form C relay (dry contact) and all data is available via RS-485 Modbus at 9,600 bps; use NB02AA to manage up to 30 units centrally.
Can the cable be reused after a leak?
The contaminated film section must be replaced; connectors and controller remain, then reset per the procedure.
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.