Buchholz gas tester - BGT
System solutions for fault diagnosis

Buchholzgas-Tester - BGT Application

The Buchholz gas tester serves to measure the fault gas content of the Buchholz relay. Measurement can be performed directly at the sampling site, e.g. in the transformer substation or in a testing laboratory. The Buchholz gas tester allows quick fault analysis on site, hence facilitating the decision-making process with regard to the elimination of faults.


  • Quick and easy analysis of the Buchholz gason site to identify air and fault gas collection
  • Can be combined with the Buchholz gas sampler or Buchholz relay extensions to form a functional unit
  • Deductible signal limit value
  • Maintenance-free sensor
  • Easy calibration with air

Technical data

Detector: Thermal-conductivity measuring cell
Gas to be measured: Buchholz gas
Gas volume per measurement: 15 ml
Gas used for calibration Air
Measuring range / accuracy: 0 .... 1 Vol.-% / < 10 % rel. error
1 .... 10 Vol. % / < 20 % rel. error
Power supply:
(Chinch socket 6 mm):
12 V DC
Power supply with power unit: 230 V - 115 V AC
Power input: 20 VA
Weight: 1,5 kg
Dimensions (L x W x H): 155 x 195 x 85 mm
Protective system: IP 40
Material of casing: Aluminium
Ambient temperature (measurement): 0 ..... 40 °C
Relative humidity (measurement): < 80%
Ambient temperature (storage): -10 ... 60 °C
Relative humidity (storage): < 80%
Scope of supply

  • Buchholz gas tester type BGT
  • Plug power unit with connecting lead 230 V - 115 V AC/12 V DC
  • On-board system connecting lead 12 V DC
  • Buchholz gas sampler type BGS
  • Sealing plug
  • Oil trap with opening plug
  • Septum plug
  • Replacement seals 3 pcs.
  • Replacement septa 5 pcs.
  • Transport case

Relevant informations:

Technical datasheet
PDF Format >>
Buchholz gas sampler BGS
Combine the Buchholz gas tester with the
Buchholz gas sampler BGS
more >>
Determination of the fault type from Buchholz gas analyses
more >>
CIGRE Colloquium
Paris, August 25, 2010
The Extension of IEC 60599 to Open Type Transformers >>
Gas Household of Open Type Transformers
ew, Jg. 109 (2010),heft 14-15, S.56-59
New Knowledge >>