ATEX-Approved Products

Operators (Ex 'de') Ammeter

The WH - WP operators and WA instruments are normally used in the chemical and petrochemical plants, off-shore platforms, refineries and any other industry where hazardous atmospheres (gas and combustible dust) are potentially present.

The WH - WP - WA range has been designed to meet the main requirements of power distribution, monitoring and signaling, and other electrical functions inside the hazardous area of the plant.

Unit Price:

Customers can still purchase even if there is no stocks available

Unit Of Measurement (UOM):

Ammeter unit, available with a large number of measuring range electromagnetic frameworks, scaled 2 or 5
times as per side tables.

The ammeter unit can make a direct measurement or connected to a current transformers and upon request, to a secondary current transformer.

The ammeter has a working temperature range from -40°C to +60°C.


Overload ScaleMeasuring RangeMeasuring Way
WAM 0-2 2 0 - 1 / 2A Direct
WAM 2-2 2 0 - 1 / 2A Current Transformer
WAM 5-5 5 0 - 1 / 5A Current Transformer

The WH - WP - WA series are normally installed on CSE enclosures series used for the following main applications:

  • control station and instrument housing
  • motor starter unit
  • instrument housing
  • lighting control panel

and fitted with other electrical and/or electronic equipment as per our client specific requirements.

The material used to manufacture the UH-UP operators and WA instruments have been studied to grant the maximum protection against the highly corrosive agents present in these industries:

  • the external components (handle, push-button, diffuser, ect.) are made of high-quality antistatic and UV-protected polymers and provided with EPDM sealing to mantain the IP66 level of protection of whole control station;
  • the internal Ex d components are made of high quality thermoplastic and are available for standard installation on cover or, as option, on a dedicated mounting rail;
  • the larger handles are padlockable in different positions (upon request)
  • the LED units for pilot light and luminaire push button are available with two range of voltage as indicated in the ordering table;
  • the rated current of Ex switch module is up to 16 Amp. and its mechanical life is 1,000,000 times;
  • the high brightness and the electrical life of LED units are granted for a minimum of 100,000 hours;
  • the diffuser of pilot lights and luminaire push button units have a special design to grant a high visibility degree in any situation
  • the external components are fixed directly on cover with a Ø 30 mm. hubs and a directional anchor point depending by type of installation requested.

certificate number: ATEX & IECEx certificates available TC RU C-IT.AA87.B.00509
marking: Ex-proof Logo II 2GD Ex d e mb IIC T6 Gb Ex tb IIIC T85°C Db (control stations)
ambient temperature: –55°C +60°C
degree of protection: IP66
conformity: Directive ATEX 2014/34/EU TP TC 012/2011
standards: IEC-EN60079-0 IEC-EN60079-1 IEC-EN60079-7
ГОСТ 31610.0 ГОСТ IEC 60079-1 ГОСТ Р МЭК 60079-7
IEC-EN60079-11 IEC-EN 60079-18 IEC-EN60079-31
ГОСТ 31610.11 ГОСТ Р МЭК 60079-18 ГОСТ Р МЭК 60079-31
category: suitable for Zone 1 - 21 (gas) and Zone 2 - 22 (dust)

WAM Ammeter unit for Ex e enclosures