What is included in the solution?
NA07AA uses contact electrodes to detect any conductive liquid – water, condensate and conductive chemical solutions such as acids and alkalis – within 10 seconds. Its materials offer better corrosion and chemical resistance than conventional metal sensors, and self-calibration removes the need for periodic calibration; the built-in LED (green normal / red abnormal) allows quick on-site checks.
|
Component |
Code |
Function |
Quantity rule |
Type |
|
Point-type leak sensor (integrated controller) |
NA07AA |
Detects conductive liquid at the spot, NPN output |
1 per monitored point |
Required |
|
24 VDC power supply |
SMPS 24VDC |
Powers sensors (20 mA each) |
Size by sensor count + margin |
Required |
|
Point-sensor protective case |
NF03A |
Mechanical protection, clear top shows LED |
1 per sensor (recommended) |
Optional |
|
24 VDC interposing relay |
Relay 24VDC |
Converts NPN to dry contact where DI requires |
1 per sensor (if needed) |
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
-
NA07AA electrodes sense the change when a conductive liquid bridges them; the integrated controller turns the LED red and switches the NPN (normally closed) output.
-
Self-calibration keeps long-term stability without periodic calibration.
-
Responds to small amounts of low-concentration substances; compact Ø52 mm body fits tight spaces.
Typical applications
-
Tank bottoms, sumps, drip trays under pumps, valves, flanges
-
Under indoor units, FCUs, precision ACs, humidifiers; condensate pans
-
Chemical cabinets, lab benches, dosing stations (conductive solutions)
-
Pump rooms, plant rooms, basements – early flood warning
-
Under washers and water-using equipment in hotels and hospitals
Benefits for contractors & owners
-
Integrated controller – no separate controller, standalone install
-
Detects water and conductive chemical solutions; ≤ 10 s response
-
Self-calibrating – no periodic calibration
-
Corrosion- and chemical-resistant materials – longer life than metal sensors
-
Green/red LED on the unit; 24 VDC NPN output to BMS/PLC
-
Compact Ø52 × 19 mm; S-Mark, CE, KC certified
Technical specifications
NA07AA point-type leak sensor
|
Parameter |
Value |
|
Part number |
NA07AA |
|
Type |
Point-type leak sensor with integrated controller – standalone installation |
|
Detection method |
Contact-type electrodes – senses change in electrode value |
|
Detectable substances |
All conductive liquids: water, condensate, conductive chemical solutions (acids, alkalis), etc. (others: contact us) |
|
Dimensions |
Ø52 mm × 19 mm (D) |
|
Power supply |
24 VDC, 20 mA |
|
Output |
NPN open collector (normally closed) – 1 channel; internal LED: green = normal / red = abnormal |
|
Response time |
Within 10 seconds |
|
Calibration |
Self-calibration – no periodic calibration required |
|
Operating temperature |
-30 to 100 °C |
|
Material |
PP |
|
Certifications |
S-Mark, CE, KC |
Protective accessories & backup power (optional)
|
Code |
Name |
Material |
Dimensions / data |
Purpose |
|
NF03A |
Protective case for point-type sensor |
SUS, PVC |
80 × 100 × 50 mm |
Protects NA07AA; transparent top shows LED (green/red), SUS top plate on request |
|
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 / PLC integration
|
Signal |
Output |
To BMS / DDC |
Suggested point name |
|
Leak at point |
NPN open collector, normally closed |
DDC/PLC digital input (DI) or ND01AA panel input |
LD-Px-ALM |
|
Power / signal loss |
NC logic – output opens on fault |
BMS sees DI state change |
Configure loss-of-signal alarm |
Note: if the DI only accepts dry contacts, add a 24 VDC interposing relay. Each NA07AA draws 20 mA – sum the load when sizing the power supply.
Installation & operation notes
-
Place the sensor at the lowest point where liquid collects first, electrode face down.
-
Use the NF03A case where impact or dirt is expected; its clear top lets you see the LED without opening.
-
Apply 24 VDC with correct polarity; wire the NPN output to a BMS/PLC DI (use an interposing relay if the DI needs a dry contact).
-
Function test: wet the electrodes – the LED turns red and the BMS receives the alarm; dry to return to normal.
Quantity take-off example
Example: pump room with 6 points (2 sumps, 4 pump drip trays)
|
Item |
Quantity |
|
NA07AA |
6 pcs |
|
NF03A |
6 cases |
|
SMPS 24 VDC |
1 unit (120 mA load + margin) |
|
BMS DI points |
6 |
Frequently asked questions (FAQ)
Does NA07AA need a separate controller?
No. It has an integrated controller; it only needs 24 VDC (20 mA) and its NPN output wired to the BMS/PLC or ND01AA panel.
Can NA07AA detect chemicals?
Yes, any conductive liquid including acid and alkali solutions. It does not identify the substance and does not detect non-conductive liquids such as oil – use NA01AA/NA02AA/NA03AA cables when discrimination is needed.
Point type or cable type?
Point type for fixed, known collection points; film cable for large areas, long pipe runs and raised floors.
What is the output?
NPN open collector, normally closed, 1 channel. Normally-closed logic lets the BMS detect loss of signal as well.
Does it need periodic calibration?
No – NA07AA is self-calibrating.
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.