Edwards vacuum Vacuum pump products Vacuum pump services & repairs Vacuum spares and vacuum parts Vacuum manufacturers
Home About Absolute Vacuum Vacuum pump resources Contact Absolute Vacuum Newsletter Modulyo Freeze Drying

Edwards (formerly BOC Edwards) Vacuum Gauges and Vacuum Calibration

Edwards Calibration equipment

Edwards EC6ST 6 Port Calibration System

Features & benefits

Enables manufacturers to comply with quality standards such as ISO 9000
Calibration from 1000 mbar to 10'6 mbar by direct comparison with master reference gauges traceable to national standards
Simple operation
Simultaneous calibration of a number of gauges
Fitted with baking facility to reduce cycle times

Edwards EC6ST 6 Port Calibration System

BOC Edwards gauge calibration systems are designed to enable gauge users to comply with quality standards, such as 150 9000, which are increasingly specified by commercial military and government establishments. These standards call for regular calibration of measuring equipment used in production processes.

Most vacuum processes are carried out within the pressure range 1000 mbar to 10-6 mbar and the instruments most frequently requiring calibration are capsule gauges, thermal conductivity types (for example, Pirani and thermocouple gauges). magnetron and hot cathode ionisation gauges.

The calibration system consists of a six-port chamber fitted with a liquid nitrogen cold trap. The chamber can be isolated from the turbomolecular pump by means of a manually operated isolation valve.

The chamber is 'roughed' by a rotary pump which is connected to the chamber through an electrically activated valve. When the pump is not 'roughing' the chamber it is used as a 'backing' pump for the turbo.

Calibration gas is admitted into the system through a narrow pipe, dis- charging gas onto the domed top of the chamber. The flow of gas is controlled by a manually operated fine control needle valve, to which the gas supply is connected.

Calibration is performed by connecting the test gauges to the chamber and evacuating it to a base pressure at least a decade and a half below the lowest point to be calibrated. the calibration gas inlet valve is then used to increase the pressure, noting readings on the test gauge compared to that of the reference master gauge.

Edwards EC6ST 6 Port Calibration System

Technical Data

Base pressure (cold trap empty) 5 x 10 -8 mbar after 5-10 hours (typically)
Chamber volume 5 liters
Test ports Total 6. 4 ports used by reference gauges
Gas inlet control Fine control needle valve
System pressure control Manual gas inlet and pumping speed control
Reference gauges 1 x 10 -6 to 5 x 10-3 mbar (ion gauge)

1 x 10-3 to 1 mbar (1 mbar range Barocel)
0 to 10 mbar (1 (1 mbar range Barocel)
1 to 1 000 mbar (1 000 mbar range Barocel) Note- Other gauges available on request.

Vacuum pumps Turbo pump EXT250, DN1OOCF Rotary pump RV5
Baking temperature 90 ° C
Dimensions see diagram Vacuum
Weight packed: 400 kg Unpacked: 200 kg

Edwards EC6ST 6 Port Calibration System

Edwards EC6ST 6 Port Calibration System

Ordering Information

EC6ST – 6 port calibration system (230 V 50 Hz): D15487000
EC6ST – 6 port calibration system (115 V 60 Hz): D15488000