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204NS MAGNETIC CONTACT (REED-SWITCH SENSOR)
• Typical part numbers seen in the alarm industry
– Sentrol / Interlogix 204NS (surface mount, N.O.)
– Aleph AS-204NS or GS-204NS
– Generic “204-NS” from many Asian OEMs (same footprint, same specs)
• Operation principle
– Normally-open (Form A) reed switch hermetically sealed in glass; closes when a permanent magnet is within the make distance.
– Supplied as two ABS housings (switch+lead wires, and magnet).
| • Consolidated electrical & mechanical specification | Parameter | Typical value | Comment |
|---|---|---|---|
| Contact form | SPST-N.O. (Form A) | — | |
| Max switch voltage | 30 V AC/DC | Signal level only | |
| Max switch current | 0.2 A | 10 W or 3 W depending on vendor | |
| Contact resistance | < 150 mΩ (initial) | — | |
| Breakdown voltage | > 200 VDC | Between leads | |
| Make distance | ≤ 25 mm (1 in) | Break ≈ 28–30 mm | |
| Operating temp | –40 °C … +65 °C | Indoor-rated | |
| Housing | ABS, 63 × 13 × 13 mm | Both parts identical size | |
| Leads | 22 AWG stranded, ~450 mm | UL-listed jacket |
• Typical wiring
– Two-wire series loop into alarm panel or MCU input (with pull-up).
– Polarity irrelevant (pure mechanical switch).
• Common datasheet references
– Interlogix (legacy GE Security) DS-01-204N series PDF
– Aleph America “GS/AS-204NS Surface Mount Switch” datasheet
METCO 204NS (THERMAL-SPRAY POWDER)
• Intended use: 8 wt %-yttria-stabilised zirconia (8YSZ) feed-stock powder for atmospheric plasma spray (APS) thermal-barrier coatings (TBC) on turbine components.
| • Key datasheet values (Metco 204NS-G Premium, revision 2019) | Property | Value | Method / note |
|---|---|---|---|
| Chemistry | ZrO₂ + 7.8–8.3 wt % Y₂O₃ | ASTM C471 | |
| Particle size | –125 + 11 µm (d₅₀≈55 µm) | Laser scattering | |
| Apparent density | 2.3 g cm⁻³ | ASTM B212 | |
| Dep. porosity | 10–15 % (APS, 50 µm pass) | Micrograph | |
| Max recommended service temp | 1350 °C (2460 °F) | in air | |
| Packaging | 5 kg plastic bottle / 25 kg pail | — |
SDS and TDS are downloadable from Oerlikon-Metco portal (registration free).
Magnetic contact sensors:
• Still the de-facto standard in wired intrusion systems; new designs add tamper loops or embed hall sensors for higher reliability.
• IoT devices integrate the reed switch with BLE/Zigbee radios, but the reed capsule ratings remain unchanged.
Thermal-spray powders:
• 8YSZ remains benchmark for TBCs. Current R&D explores gadolinia-zirconia and multilayer “columnar” 204NS coatings deposited by Suspension Plasma Spray (SPS) for >1500 °C capability.
Why the same code? “204” is a sequential family number; “NS” is “Normally-open Surface-mount” for alarm parts, whereas Metco uses “NS” to denote a specific fused-and-crushed morphology code. The overlap is coincidental.
• Alarm-sensor use: comply with local intrusion-alarm standards (UL 634, EN 50131).
• Thermal-spray powder: follow OSHA/REACH regulations; zirconia dust is nuisance particulate—use appropriate PPE and fume extraction.
If you need the door sensor:
If you need the thermal-spray powder:
• Generic Chinese OEM reed switches sometimes deviate from the spec (smaller reed capsule, lower breakdown voltage). Verify with a hipot test if used in life-safety circuits.
• Metco 204NS is not recommended for Electron-Beam PVD; use Metco 203 instead.
• Investigate solid-state AMR/Hall alternatives (e.g., TI DRV5032) for door sensing where debounce-free operation is needed.
• For TBCs, keep an eye on YAG-based (Y₃Al₅O₁₂) suspension feed-stocks for higher sintering resistance.
“204NS” designates two unrelated products:
Choose the relevant datasheet accordingly; manufacturer PDFs are linked above.