Rugged Tachometer, Ex nA, panel mounting

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  • ATEX, IECEx, ETL and cETL 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
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  PDF logoNEW application guide

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 contain a second display which can simultaneously show the run-time of the monitored machinery.

Accessories, include a display backlight, isolated dual alarms, isolated synchronous pulse output 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. Specified tag or application information can also be printed onto the rear of the instrument.

Other tachometers in our range include:


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



BA317NE Tachometer#
Mounting 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.
Europe ATEX Group II Category 3GD
Ex nA ic IIC T5 Gc
Ex ic tc IIIC T80°C Dc
-40°C ≤ Ta ≤ +60°C
USA ETL 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
International IECEx Ex nA ic IIC T5 Gc
Ex ic tc IIIC T80°C Dc IP66
-40°C ≤ Ta ≤ +60°C
Backlight Yes
Alarms Yes*
4/20mA output Yes*
Pulse output Yes*



Datasheet PDF logodownload
ATEX certificate PDF logodownload
ETL & cETL certificate PDF logodownload
IECEx certificate PDF logodownload
Ingress certificate PDF logodownload
Instruction manual PDF logodownload
Application guide PDF logodownload
Declaration of Conformity PDF logodownload
CAD files ZIP logodownload

# Shown with optional separately powered backlight.

* Only one output option can be fitted.

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