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Operating instructions
Pressure switch model B7, differential pressure switch model D7 and
temperature switch model T7
for potentially explosive atmospheres in the European Union according to Directive 2014/34/EU
(ATEX) / IECEx
In the following intrinsically safe version:
• B7##CEN6## or B7##CEN7## Pressure switch
• D7##CEN6## or D7##CEN7## Differential pressure switch
• T7##CEN6## or T7##CEN7## Temperature switch
B7
D7
T7
Pressure switch
Differential pressure
Temperature switch
switch
IM-B7D7T7/ATEX Exia-EN-Rev G 12/2024 Page 1of 18
P/N 095I401-03EN
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Summary of Contents for Ashcroft B7
- Page 1 Operating instructions Pressure switch model B7, differential pressure switch model D7 and temperature switch model T7 for potentially explosive atmospheres in the European Union according to Directive 2014/34/EU (ATEX) / IECEx In the following intrinsically safe version: • B7##CEN6## or B7##CEN7## Pressure switch •...
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Page 2: Table Of Contents
Table of Contents: General ..................................4 Purpose of this manual ............................4 Symbols ................................4 Limitation of liability ............................. 4 Copyright ................................4 Warranty ................................4 Manufacturer address, customer service ......................4 Security ..................................5 General sources of danger ..........................5 Intended use ................................ - Page 3 12.1 Data sheet for switches B7, D7 and T7 ......................17 12.2 EU Declaration of Conformity ........................18 Page 3from 18...
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Page 4: General
For the product described here we grant warranty according to § 6 warranty for defects, in our General Terms and conditions of delivery and payment. 1.6 Manufacturer address, customer service Ashcroft Instruments GmbH Phone: +49 (0) 2404/5589-888 Fax: +49 (0) 2401/808-999 Max-Planck-Strasse 1-9 Email: customer.service@ashcroft.com... -
Page 5: Security
2 Security 2.1 General sources of danger Pressure and temperature switches are usually components of a control and measurement system. These devices have pressure- or temperature-loaded parts, the failure of which can lead to dangerous situations. The switches should be selected in accordance with the applicable standards and regulations and the rules of technology. -
Page 6: Personnel Qualification (Target Group Assessment)
3 Use in potentially explosive atmospheres according to Directive 2014/34/EU (ATEX) Our Ex products B7/D7/T7 have equipment protection through the application of intrinsically safe circuits "Ex ia" (EN 60079-11) with a very high level of equipment protection. Intrinsic safety by energy limitation of sparks and thermal effects applicable for gases, vapours and dusts in the specified application range. -
Page 7: Range Of Use
Annex II to the Directive. The Ashcroft® B7, D7, T7 series pressure and temperature switches consist of a two-piece cylindrical housing with a lower housing section and cover. The enclosure is made of injection molded A380 aluminum or 316L stainless steel. -
Page 8: Marking
The housing guarantees protection class IP6X according to EN 60529. The switches must be operated via an appropriately certified shunt diode safety barrier or alternatively via an isolating switching relay. These auxiliary power supply devices must be installed outside the hazardous area. The following limit values must not be exceeded: Ui = 30 V Ii = 100 mA... -
Page 9: Technical Data
For all T7 temperature switches, measures must be taken during installation on site to ensure that the maximum surface temperature is not exceeded. Plastic blind plugs are used to protect the device during delivery and must be replaced by suitable cable entries in compliance with the above criteria. -
Page 10: Structure And Function
6.3 Description of the components 6.3.1 Measuring element of pressure switch B7 B-Series positive or negative overpressure switches use two different sensing elements depending on the switch point requirements. -
Page 11: Transport
Table 1: Electrical ratings of the microswitches 6.3.6 Housing Ashcroft switches have a flameproof enclosure conforming to the requirements of the EU Type Examination Certificate. It is made of epoxy coated cast aluminium A380 or optionally of stainless steel 316L (option YW). -
Page 12: Mounting
Do not press any objects (e.g. screwdrivers) against the diaphragm. The pressure measuring ranges B7/D7 may only be overloaded as specified in the data sheets. The temperature measuring ranges T7 may only be overloaded according to the specifications in the data sheets. -
Page 13: Electrical Connection
Use only with mechanical process connection provided - for version, see ordering code on the nameplate of the device with matching thread seal. When connecting the device, the lines must be depressurized. The pressure measuring line must be laid with a gradient so that, for example, no air pockets can occur during liquid ... -
Page 14: Commissioning And Switching Point Adjustment
As indicated below, the switch point adjustment is made using a ⅞-inch screw. The microswitch mounting screws and bracket adjustment screw are factory sealed and must not be broken. 8.4.1 Pressure switch model B7 The adjustment screw (7/8 inch) for the switching point is located centrally in the bottom of the housing. -
Page 15: Changes To The Installation Site
9 Maintenance All maintenance or inspection work must be carried out in accordance with IEC 60079-17. All ASHCROFT switches are virtually or completely maintenance free. Ensure that the enclosure remains closed at all times to ensure IP and ignition protection. -
Page 16: Cleaning And Maintenance
Check the pressure connection lines for leaks. Checking the electrical connections. Remove any dust deposits Checking the legibility of the nameplate Possible damage to the housing or the earths 9.2 Cleaning and maintenance Cleaning is carried out with a non-aggressive cleaning agent and a damp, soft cloth to avoid electrostatic charging. In the same work process, care can be taken to detect possible damage to the device at an early stage. -
Page 17: Disposal
For more information on the disposal of packaging, please contact your local authority. 12 Appendix 12.1 Data sheet for switches B7, D7 and T7 Detailed data sheets are available directly from the manufacturer (see chapter 1.6 Manufacturer's address, customer service). -
Page 18: Eu Declaration Of Conformity
12.2 EU Declaration of Conformity Page 18 from 18...
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