Pressure Difference Switch Models: 301, 303, 304, 381 & 384
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Technical Datasheet Performance Series Pressure Difference Switch Models: 301, 303, 304, 381 & 384 Key Features  Precision stainless steel mechanism for arduous atmospheres and high humidity.  Static pressure up to 250 bar (3500 psi).  Set point adjustable over whole range against calibrated scale with tamperproof adjuster.  Weatherproof and Flameproof models ATEX and IECEx Product applications The 300 Performance Series is suitable for a wide range of applications in:  The Performance Series differential pressure switches utilise a stainless steel diaphragm based sensor. This, when coupled with a precision stainless steel mechanism designed to minimise friction in the moving parts, helps deliver the market leading performance customers have come to expect from the series. Chemical Petrochemical Refining Power Food Industry The choice of models available ensures that the 300 Performance Series is suitable for use in: Corrosive atmospheres Resistant to chemical attack How can we help you? Delta Controls’ offers fast, efficient and knowledgeable support when and where you need it. Please visit our web site at www.delta-controls.com to find your local support centre or call us on: +44 (0) 1252 729140 Page 1 of 10 www.delta-controls.com  Designed in the mid-1970s and developed over subsequent years, the Performance Series switch range offers users the broadest range of options, the highest levels of set-point repeatability and the confidence of long term performance that a mature product such as this can prove. Series Overview  Hermetically sealed microswitch option  Safety vented or blow out device as standard. Performance Series

How to order Switches can be configured by selecting codes representing the desired features from the tables that follow. The chart below, describes how the model code is built up. For assistance in configuring a switch that best suits your needs, please contact your local sales office. Electrical Entry Table 3 Material of Wetted Part Table 4 Process Connection Table 7 Options & Treatments Table 8 Special Engineering Table 9 NOTE: Options shaded in the following tables are the most common options and are available on the quickest lead-times and at the lowest cost. NOTE: Only the most common...

ENCLOSURE TYPES All enclosures except Type A are finished in light grey epoxy resin paint. Special finishes to order. Weatherproof Enclosures INTRINSIC SAFETY Because of the low voltages and currency of I.S. circuits, we recommend using gold and/or sealed contacts. General Purpose The basic enclosure is pressure die-cast in zinc alloy, offering weather protection not less than NEMA 4 + 13/IP66. For Aggressive Atmospheres Investment cast enclosure in austenitic stainless steel with weather protection not less than NEMA 4X + 13/IP66. Flameproof Enclosures Category 2 (Zone 1) IECEx Ex db IIC...

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 adaptor is factory fitted. Adaptor kits may also be provided retrospectively to fit at site if required. Ask for details. See diagrams for dimensions. ‘W’ and ‘N’ SAFETY NOTE Code Enclosures W & N: Clearance for 20mm (3/4 in) outside dia conduit. Enclosures H, K & A: M20 x 1.5 ISO thread (direct) Enclosures H & K: M20 x 1.5 ISO thread,...

TDS-300-REV. J: JAN 2016 Maximum static pressure applied in the reverse direction (i.e. to LO port with HI port to atmosphere) will be contained without failure. The diaphragm will however have been distorted, leading to a degradation of performance and a shortening of the service life. For applications where regular reversals of pressure are inevitable, a special engineering facility is available. *Ranges BC/0C/BU/0U, J0/J3, M2/M8 and P8/PK not available on models 303, 381 and 384 Switch Options A much wider of switching options can be engineered to customer’s requirements for Model 301...

TDS-300-REV. J: JAN 2016 Model 381, 384 IEC947-5-1 / EN 60947-5-1 RATING CSA RATING (RESISTIVE) § see note Designation & Utilisation Category Rated operational current I e (A) 5 Amps @ 110/250V AC Light Duty for AC only 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 at rated operational voltage U e § 5 Amps @ 110/250V AC & 5 Amps @ 30V DC Environmentally sealed § 1 Amp @ 30V AC & 30V DC Environmentally sealed with gold contacts 5 Amps @ 250V AC & 2 Amps @ 30V DC Hermetically sealed. Gold...

Tropicalisation High humidity atmospheres 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 Service 3: Process and non-process parts are cleaned for use with oxygen Stainless Steel Pipe Mounting Bracket Permits local 2” pipe work to be utilized 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 Last 4 digits...

TDS-300-REV. J: JAN 2016 MODEL 303 TABLE 10B MODEL 303 ADJUSTABLE SWITCHING DIFFERENTIAL Range Code Switching differentials in.H2O/psi. Due to manufacturing tolerances the figures quoted in these tables are for guidance only. Should the differential be critical for specific applications our engineers should be consulted prior to ordering. Flameproof models may be up to 2 times higher depending on the range. Should the differential be critical for specific applications our engineers should be consulted prior to ordering. TABLE 10D MODEL 303 ADJUSTABLE SWITCHING DIFFERENTIAL MODELS 301 &...

Optional Extras Chemical Seals Chemical seals of our own or proprietary manufacture can be fitted when required. Mounting Position/Location/Installation Vertical as shown, IN DIMENSIONS, taking care to avoid siting in locations that transmit excessive shock or vibration. For further advice contact our engineers. Pollution degree (EN60947-5-1) All products are suitable for use in pollution degree 3. For extreme conditions where condensation may readily form, then sealed contacts should be used. See Table 6 Codes 08/09, 0G/0H, 2G, 28, H2/H3/H4/H6. Electrical Isolation These products are not...