HS-421I Intrinsically safe 4–20 mA vibration sensor (velocity) with additional AC output, top exit, M12 connector

Outputs: 4–20 mA (vibration velocity) and AC (acceleration), M12 connector.

Output AC IEPE + 4–20 mA
Exit Top exit
IP IP67
Ex Ex i

Ordering options

Measuring range — velocity

Mounting thread

You do not have to choose every option — we will agree the rest in the quotation.

Quantity

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
Can be configured for the application
Piezoelectric element in compression design

Technical specifications

Parameters as specified by the manufacturer.

Measurement
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 signal
Output type	AC (IEPE) — acceleration, 4–20 mA

Connection and mounting
Cable / connector exit	Top exit
Connector	M12, 4-pin
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

Operating conditions and protection
IP rating	IP67
Electromagnetic compatibility (EMC)	EN 61326-1:2013

Hazardous areas and approvals
Hazardous-area version	Intrinsically safe (Ex i)
Approvals and certificates	ATEX (EU)

Construction
Sensing element	PZT — compression
Case material	Stainless steel
Weight	150 g (nominal)
Features	For data collectors, For PLC / DCS systems

Identification
Model	HS-421I
HS Sensors part no.	HS-421I-TOP-M12
Manufacturer's product name	HS-421I – Top Exit – 4 Pin M12 Dual Output Intrinsically Safe Accelerometer