Rugged Tachometer, Ex nA, panel mounting



  • To be discontinued, ATEX Ex nA certification will be de-harmonised in 2022, alternative is BA317E-SS.
  • Ex nA & Ex tc certification allows installation in Zone 2 and 22 without Zener barriers or galvanic isolators.
  • Rugged Stainless Steel enclosure for use in Ex n, Ex e, Ex p or Ex t panel enclosure located in Zones 2 & 22.
  • Proximity detector, magnetic pick-off, voltage pulse, or switch contact input.
  • Separate speed and run-time displays
  • Optional:
  • Internally powered display backlight
    Isolated Alarms
    Isolated synchronous pulse output
    Isolated 4/20mA output
IECEx logoEX logoETL logo

Product details
This easy to use, Ex nA and Ex tc certified tachometer can display speed in engineering units from a wide variety of pulse output sensors such as a proximity detector or switch contact. It can be installed in Zone 2 or 22 without the need for Zener barriers or galvanic isolators thus significantly reducing cost. International certification allows use worldwide.

To simplify maintenance, the instrument also contains a second display which can simultaneously show the run-time of the monitored machinery.

Accessories, include a display backlight, isolated dual alarms or isolated synchronous pulse output or isolated 4/20mA output.

The instrument can be supplied configured and fitted with a customer specified printed scale card showing the units of measurement for no additional charge. Specified tag or application information can also be printed onto the rear of the instrument.

To select options for your application please refer to the following table.

Model BA317NE
BA317NE #
Mounting & Enclosure Rugged panel 105 x 60 mm
Case material
316 Stainless Steel
Protection Front IP66, rear IP20
Display Speed: 8 digits 9mm high
Run-time: 6 digits 6mm high
Certification  Ex ic certification codes only refer to the instrument push button contacts which are nonincendive.
Ex nA ic IIC T5 Gc
Ex ic tc IIIC T80°C Dc IP66
-40°C ≤ Ta ≤ +60°C
Europe ATEX Group II Category 3GD
Ex nA ic IIC T5 Gc
Ex ic tc IIIC T80°C Dc
-40°C ≤ Ta ≤ +60°C
Class I Zone 2 AEx nA ic IIC T5 Gc
Zone 22 AEx ic tc IIIC T80°C Dc
-40°C ≤ Ta ≤ 60°C
Canada cETL
Ex nA ic IIC T5 Gc
Ex n IIC T5 Gc
-40°C ≤ Ta ≤ 60°C
4/20mA output
Pulse output

Mounting &
Case material
Downloads BA317NE
Datasheet PDFDownload
IECEx certificate PDFDownload
ATEX certificate PDFDownload
ETL & cETL certificate
Ingress certificate PDFDownload
Instruction manual PDFDownload
Abbreviated manual PDFDownload
Application guide PDFDownload
Declaration of Conformity (EU)
CAD files PDFDownload

# Shown with optional separately powered backlight.
* Only one output option can be fitted.