Rugged Tachometer, Ex nA, field mounting



  • To be discontinued, ATEX Ex nA certification will be de-harmonised in 2022, alternative is BA314G.
  • Ex tc certification allows installation in Zone 2 and 22 without Zener barriers or galvanic isolators.
  • Proximity detector, open collector, magnetic pick-off, voltage pulse, or switch contact input.
  • Separate speed and run-time displays
  • Isolated synchronous pulse output
  • Optional:
  • Internally powered display backlight
    Isolated Alarms
    Isolated 4/20mA output
    Stainless steel legend plate
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 and an 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. An optional Stainless Steel legend plate is also available which can be supplied laser engraved with customer specified tag and application information.

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

Model BA314NG
BA314NG #
Mounting & Enclosure Field 122 x 120mm
Protection IP66
Display Speed: 8 digits 18mm high
Run-time: 6 digits 12mm 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
-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
Ex ic tc IIIC T80°C Dc
Class III Div 2 Class II Div 2 Gp F, G
-40°C ≤ Ta ≤ 60°C
4/20mA output

Mounting &
Downloads BA314NG
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 backlight, separately powered.