Technical Datasheet Diaphragm Operated Pressure Difference Switches: Industrial S30 Series • Field set point adjustment against a reference scale. • SPDT or DPDT switching. • Terminal block for easy field wiring. • Hermetically sealed microswitch options. • Optional gold alloy contacts. • NACE MR-01-75 compatibility. • Maximum working pressure up to 250 bar (3500 psi). • Ranges available up to 10 bar (160 psi). • Safety vented design as standard. • Explosionproof NEMA 4, 4X, 7, 9 • Flameproof EEx d IIC - ATEX. Perf ormance characteristics Enclosure • IP66 Protection Wetted parts options • 316 Stainless Steel diaphragm (standard) • Suitable for NACE MR-01-75. • Nitrile diaphragm and seal with aluminium or cast iron flanges (limited ranges) Product applications The S31/4 is suitable for a wide range of applications in many Industry sectors: • Oil & Gas • Chemical • Petrochemical • Refining • Power • OEM The choice of models available ensures that the S31/4 is suitable for use in: • Corrosive atmospheres • Resistant to chemical attack Standard Electrical ratings – Refer to Table 6 • 1 Amp with gold contacts • 5 Amps – general purpose, environmentally sealed & hermetically sealed. Process connection • Rc ¼ (BSP), ¼ NPT Internal, ½ NPT Internal & ½ NPT External. Unit weight • Accuracy • Set point repeatability ± 1% of span at 20 °C / 68 °F ambient. How can we help you? Delta Controls’ range of reliable pressure and temperature measurement instruments can be customised to meet individual requirements. For technical advice o

Enclosure FINISH All enclosures except Type R, A and U are finished in light grey epoxy resin paint. Special finishes to order. INTRINSIC SAFETY Because of the low voltages and currency of I.S. circuits, we recommend using gold and/or sealed contacts. NOTE: In the interests of safety and reliability not all enclosures are available with all wetted parts. See Table 4. NOTE: Codes T and U – to increase gas class see Table 6 NOTE 2. NOTE: Codes H, T for 4X Aluminium Enclosure protected by quality epoxy paint system. Performance of enclosure required careful installation and sealing of cable gland...

Electrical Entry Adaptors are available for other popular thread sizes. Enclosures H, R, T & U: 3/4-NPT INT. dual entry For aluminium flanges (Code D) select only from enclosures codes H, T and W. For Cast Iron flanges (Code E) select only from enclosure codes R, U or A. See Table 1 Material of Wetted Parts Enclosures H, R & A M20 x 1.5 ISO thread, dual entry. For codes 3 & 6 – see approvals and Table 1 Codes T & U Enclosure W: Clearance for 20mm (3/4 in) outside dia conduit. Enclosure W: M20 x 1.5 elbow adaptor to suit. Enclosure W: 3/4-NPT INT. elbow adaptor to suit. For wetted parts required...

Switching Options Model S31 / 4 IEC 947-5-1/EN 60947-5-1 Rating UL/CSA Rating (RESISTIVE) §SEE NOTE Designation & Utilization Category Rated operational current Ie (A) at rated operational voltage Ue 5 Amps @ 110/250V AC Light Duty for AC only † 2 Single pole, double throw, simultaneous falling under pressure ‡ 2 Single pole, double throw, simultaneous rising under pressure. NOTE 1 : Enclosure Codes T and U. Microswitch Codes 02 and 03 UL/CSA rating as follows:110/250V AC 5A 250V/125V DC 0.25/0.5A SPDT DPDT SPDT DPDT SPDT DPDT 5 Amps @ 110/250V AC & 2 Amps @ 30V DC General purpose precision 1...

Options & Treatments Combinations available, apply for details. Tropicalisation High humidity environment Marine and Offshore Saline atmosphere or salt spray Ammonia Process (wetted) parts and construction suitable for atmospheric ammonia. Oxygen Service 2: Process (wetted) parts are cleaned for oxygen. Oxygen Service3: Process and non-process parts are cleaned for use with oxygen. Stainless Steel Pipe Mounting Bracket Permits local 2” pipe work to be utilised for mounting the instrument. Tagging - Variety of tagging methods are available Applies when – no option is required and selection is...

Technical Specifications ELECTRICAL CONNECTIONS ACCURACY Set point repeatability + 1% of span at 20°C ambient. Terminal Block Cable entry is to a non-pinching terminal block made of a nonhygroscopic thermosetting plastic, suitable for cables up to 2 2.5mm /14AWG. AMBIENT TEMPERATURE RANGE For continuous use below –25°C (13°F) we recommend using only enclosures H, R, T, U and A with special gaskets and limited switching. MAXIMUM PROCESS TEMPERATURE Subject to appropriate installation practice, the component parts withstand up to +60°C (+140°F). Earthing/Grounding An earthing facility is provided...

INTRINSIC SAFETY Because of the low voltages and currents of intrinsically safe circuits, we recommend using gold contacts. Refer to Table 6._ For use in Zone 1 hazardous areas EEx d IIC T6 (-60° to +65°C) Enclosure Codes H and R and all models (see Table 1) Certificate number BASEEFA 01ATEX2113X_ Snap switches for use in Hazardous Locations. Class 1, Groups A, B, C, D Class II, Groups E, F, G Division 1 and 2 (Ji) CANADIAN STANDARDS ASSOCIATION Snap switches for use in Hazardous Locations. Class 1, Groups A, B, C, D Class II, Groups E, F, G Division 1 and 2 CABLE GLAND ASSEMBLY W ELBOW ASSEMBLY...

(SUPPLIED LOOSE WHEN APPLICABLE) (SUPPLIED LOOSE WHEN APPUCASLD MODEL S31 PROCESS CONNECTIONS RANGE BC/BU ^^^^ ^^^^ MODEL S31 PROCESS CONNECTIONS In the interest of development and improvement Delta Controls Ltd, reserves the right to amend, without notice, details contained in this publication. No legal liability will be accepted by Delta Controls Ltd for any errors, omissions or amendments. Delta Controls Limited Riverside Business Park, Dogflud Way, Farnham, Surrey GU9 7SS, UK.