Hansford SensorsHS-421I seriesIntrinsically safe (Ex)
HS-421I Intrinsically safe 4–20 mA vibration sensor (velocity) with additional AC output, top exit, PUR cable
Outputs: 4–20 mA (vibration velocity) and AC (acceleration), PUR cable.
- Output AC IEPE + 4–20 mA
- Exit Top exit
- IP IP68
- Ex Ex i
Technical data is taken from the manufacturer's documentation. Before ordering, please confirm the parameters against the current datasheet or with our engineer.
HS Sensors · HS-421I · as of 07/10/2026
Key features
- Intrinsically safe version — approvals: Europe (ATEX)
- For PLC / DCS systems and data collectors
- Waterproof
- Oil resistance
- Piezoelectric element in compression design
Technical specifications
Parameters as specified by the manufacturer.
| Measured quantity | Vibration acceleration, Vibration velocity |
|---|---|
| Number of measuring axes | 1 axis |
| Measuring range — velocity | 10 / 20 / 25 / 50 / 100 mm/s (standard: 10) |
| Output type | AC (IEPE) — acceleration, 4–20 mA |
|---|
| Cable / connector exit | Top exit |
|---|---|
| Integral cable | PUR |
| Mounting thread | 1/4"-28 UNF, female (standard), 1/4"-28 UNF, male, Quick Fit, female, M6 × 1 mm, male, M8 × 1.25 mm, male, M10 × 1.5 mm, male |
| IP rating | IP68 |
|---|---|
| Electromagnetic compatibility (EMC) | EN 61326-1:2013 |
| Hazardous-area version | Intrinsically safe (Ex i) |
|---|---|
| Approvals and certificates | ATEX (EU) |
| Sensing element | PZT — compression |
|---|---|
| Case material | Stainless steel |
| Weight | 150 g (nominal) |
| Features | Waterproof, Oil-resistant, For data collectors, For PLC / DCS systems |
| Model | HS-421I |
|---|---|
| HS Sensors part no. | HS-421I-TOP-PUR |
| Manufacturer's product name | HS-421I – Top Exit – Integral PUR Cable Dual Output Intrinsically Safe Accelerometer |
Documentation
- HS-421I datasheet (metric units)PDF · Datasheet · EN · 796.1 KB · TS1150.4
- HS-421I datasheet (imperial units)PDF · Datasheet · EN · 823.8 KB · TS1150U.4
- HS-420I / HS-AA022 / HS-510 dimensional drawing (HS-421I and others)PDF · Technical drawing · EN · 170.7 KB
- Guide: safety barriers in hazardous areasPDF · Guide · EN · 2 MB
- Stud and pad mounting instructionsPDF · Installation guide · EN · 429.3 KB
Other HS-421I versions
All HS-421I variantsThe same model with a different cable exit, connector or cable type.
- HS-421I Intrinsically safe 4–20 mA vibration sensor (velocity) with additional AC output, top exit, braided cable
- HS-421I Intrinsically safe 4–20 mA vibration sensor (velocity) with additional AC output, top exit, M12 connector
- HS-421I Intrinsically safe 4–20 mA vibration sensor (velocity) with additional AC output, top exit, 3-pin MS connector
- HS-421I Intrinsically safe 4–20 mA vibration sensor (velocity) with additional AC output, top exit, flame-retardant FR cable
Where it is used
Typical applications
- Fans
- Electric motors
- Pumps
- Compressors
- Centrifuges
- Conveyors
- Air handling units
- Gearboxes
- Rolls
- Dryers
- Presses
- Cooling systems
- HVAC systems
- Spindles
- Machine tools
- Process equipment
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