ADDITIONAL PRESSURE AND TEMPERATURE SWITCHAPPLICATION INFORMATION

SWITCH ELEMENT SELECTION B-Series switches are available with a widevariety of snap acting switch elements to meet most electrical requirements. The stan- dard contact arrangement is single pole, double throw (S.P.D.T.). This includes bothnormally open and normally closed contacts.Standard contact material is fine silver which generally is suitable for switching 8 volts or more, up to the rating in the Switch ElementSelection Table. When switching less than 8volts, optional Gold Alloy contacts are recommended.Optional dual, or 2 S.P.D.T. contacts may besupplied in B-Series industrial enclosures for applica-tions requiring two switch functions at thesame setpoint. These contacts are technical- ly not double pole, double throw (D.P.D.T.).They are synchronized at the factory to actu-ate within 1% of nominal range of each other. For simultaneous actuation of 2 S.P.D.T. contacts, option XG3 should beordered. Refer also to SW/PI-58 “BellevilleActuator.” INFORMATION & GUIDELINES FOR SETTING ASHCROFT PRESSURE, TEMPERATURE AND DIFFERENTIAL PRESSURE SWITCHES MANUFACTURER All Ashcroft pressure, temperature and dif-ferential pressure switches can be set at anypoint between about 15% and 100% of therange as designated on the label or the nom- inal range table.Ashcroft pressure and temperature switchescan be either set in the field or ordered fromthe factory preset to your requirements.When set at the factory, the specification is ±1% of the nominal range. Factory setting, or XFS, is a very popularoption, and as a result, we often receiveorders that do not have enough information or have incorrect information. HAZARDOUS LOCATIONSa.Division I. Ashcroft 700 series or other explosion proof enclosures are requiredto meet the require-ments of Division I Hazardous Loca-tions as definedby the National Electrical Code. HOW TO ORDER 1. Setpoint must be indicated. b.Division II. When “XFS” is desired: 2. Increasing or decreasing pressure mustbe indicated.Ex: B424B XFS 100#Set: 60# decreasing These enclosures also meet the lessstringent require-ments for Division II Hazardous Loca- tions. Alternatively, Ashcroft 400 seriesor other watertight enclosures with her-metically sealed switch elements are approved for use in Division II haz- ardous locations. c.Intrinsic Safety. Ashcroft 400 and 700 series pressure and temperature switches may be usedwith approved barriers in most intrinsi-cally safe systems. These switches do not create or store energy and are there- fore designated “simple devices’’ inthese systems. d.ATEX Approval. (optional) 3. For differential pressure switches, staticoperating pressure must also be specified. Ashcroft 700 series pressure and tem- perature switches are approved for ATEXdirective 94/9/EC. This European direc-tive is for equipment intended for use in potentially explosive atmospheres. See option XCN on page 10.
ATEX option shown For other Ashcroft switch models request Ashcroft Bulletin, Switch Quick Guide QG-3. All product information pages mentioned in this bulletin can be downloaded from our web site.

15