306 / 386 Models
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Technical Datasheet Performance Diaphragm Operated Pressure Difference Switches 306 / 386 Models • Precision stainless steel mechanism for arduous atmospheres and high humidity. • Static pressure up to 15 bar (200 psi), and ranges down to +/- 0.6 mbar (+/- 0.25 in.H20). • Set point adjustable over whole range against calibrated scale with tamperproof adjuster • Weatherproof and Flameproof models – ATEX and IECEx. • Models for fixed switching differential, adjustable differential and HI-LO operation. • Safety vented or blow out device as standard. • Hermetically sealed microswitch option. Perf ormance characteristics Enclosure • IP66 Protection Wetted parts options • Nitrile diaphragm & seal. Aluminium alloy flanges. • Nitrile diaphragm & seal. Cast iron flanges Product applications The 306 / 386 is suitable for a wide range of applications in many Industry sectors: • Oil & Gas • Chemical • Petrochemical • Refining • Power • Food Industry The choice of models available ensures Standard Electrical ratings • Refer to table 6 Process connection that the 306 / 386 is suitable for use in: • Corrosive atmospheres • Resistant to chemical attack Accuracy • Set point repeatability ± 1% of span at 20 °C / 68 °F ambient. • Scale accuracy ± 3% of full scale. 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 or to discuss your application please con

Enclosure FINISH All enclosures are finished in light grey epoxy resin paint – Except type A. INTRINSIC SAFETY Because of the low voltages and currents of I.S. circuits, we recommend using gold and/or sealed contacts. Since Model 306 is not normally intended for corrosive media and atmospheres the stainless steel ‘A’ enclosure (available on Models 301/304/381) is provided only as a special NOTE: In the interest of safety and availability, not all enclosures are available with all wetted part materials. See Table 4. WEATHERPROOF ENCLOSURES General Purpose The basic enclosure is pressure...

Electrical Entry Adaptors are available for other popular thread sizes. Enclosures ‘W’ and ‘N’ Standard option code 1(22mm dia) is provided with a nylon 22/20 reducer and fibre washer suitable for a standard M20 cable gland and back nut. Option code 0 elbow adapter is factory fitted. Adapter kits may also be provided retrospectively to fit at site if required. Ask for details. See diagram in DIMENSIONS Code Enclosures W & N: Clearance for 20mm (3/4 in) outside dia conduit. Enclosures N: M20 x 1.5 straight adaptor. (Approved.) ‘W’ and ‘N’ SAFETY NOTE If a metal cable gland is site fitted it...

Switching Options On models 306 & 386 only the switching options specified can be supplied. Please consult our engineers for further information. Model 306 IEC 947-5-1/EN 60947-5-1 Rating UL/CSA Rating (RESISTIVE) §SEE NOTE 5 Amps @ 110/250V AC Light Duty for AC only Designation & Utilization Category Rated operational current Ie (A) at rated operational voltage Ue 5 Amps @ 110/250V AC & 2 Amps @ 30V DC General purpose precision 1 Amp @ 125V AC & §100mA @ 30V DC gold alloy contacts for low voltage switching § 5 Amps @ 110/250V AC & 5 Amps @ 30V DC Environmentally sealed. § 1 Amp @ 30V AC &...

Options & Treatments Combinations available, apply for details. Tropicalisation High humidity environment Ammonia Process (wetted) parts and construction suitable for atmospheric ammonia. Stainless steel pipe mounting bracket permits local 2” pipework to be utilised for mounting the instrument. Tagging – Variety of tagging methods are available. Applies when – no option is required and selection is made from special engineering Special Engineering Please consult Delta sales engineering for special requirements. Performance Data MODEL 386: The switching differential on each point may be up...

Technical Specifications ACCURACY ELECTRICAL CONNECTIONS Set point repeatability + 1% of full scale Terminal Block at 20°C ambient. Cable entry is to a non-pinching block Scale accuracy +3% of full scale. made of a non-hygroscopic thermosetting plastic, suitable for AMBIENT TEMPERATURE RANGE 2 cables up to 2.5mm /14AWG. All models are suitable for operating within a range of ambient temperature Earthing/Grounding from –25 to +60°C (-13 to +140°F). An earthing stud is provided inside all weatherproof enclosures, adjacent to MAXIMUM PROCESS the entry. External earthing is standard TEMPERATURE...

W & N ENCLOSURES RANGES E1/E4 & ABOVE H & K ENCLOSURES RANGES E1/E4 & ABOVE

CABLE GLAND ASSEMBLY W/N 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.