Pneumatic pressure switch 20DD

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Leslie Mosley
5 years ago
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1 Sensor system: stainless steel 0,2 to 6 bar Microswitch with gold plated contacts (suitable for intrinsically safe operation) High accuracy (max. scattering < 1,5%) Excellent sealing properties (better than < 10-7 mbar l s-1) For mounting differential pressures with high accuracy and sensitivity Technical data Medium: Neutral, aggressive, non-inflammable gases and liquids Repeatability: ±1% full scale (depending on pressure regulation) Switching element: Microswitch with gold plated contacts Electrical connection: M20 x 1,5 Degree of protection: IP65 Temperature: Fluid Ambient At switching element -20* C -10* C +80 C max. *Pease contact our technical servie for use below +2 C. Mounting position: Optional Allowable vibrations: Max. 4 g (sinusoidal) Materials: Housing: aluminium diecast Pressure sensor: brass or stainless steel Sealing: stainless steel bellows p Ordering example See page Switching function: Microswitch SPDT Terminals 1 3: Contacts close on rising pressure Terminals 1 2: Contacts open on rising pressure N/UK

2 General informations (switching pressure difference fixed one pressure sensor *1) Type Differential pressure range *2) pvu min... pvo max. (VDI 3283) Switching pressure difference lower upper range range Operating pressure range *3) Max. allowable pressure *4) Switching cycles per minute (min -1 ) Pressure sensor material Housing Bellows Other materials Connection ,2... 1,6 0, 0, Brass Stainless steel Solder G1/4 1, , ,2 0, , ,6 0, *1) Tested in accordance with DIN 89011, 5.2., within the frequency range Hz; within the frequency range Hz tested with amplitude 1.6 mm. *2) The differential pressure is the pressure difference between both pressure sensing elements under operating conditions. *3) The working pressure range indicates the required minimum pressure as well as the load on the pressure sensor under operating conditions. *4) Even short pressure peaks must not exceed this value during actual operation (max. value = max. testing pressure) Internal thread Total weight (kg) Dimensional drawing No. Ordering example Differential pressure switch with fixed switching pressure difference, differential pressure 0,2... 1,6 bar, operating pressure bar, port size female Type: Warning These products are intended for use in industrial compressed air systems only. Do not use these products where pressures and temperatures can exceed those listed under Technical Data. Before using these products with fluids other than those specified, for non-industrial applications, life-support systems, or other applications not within published specifications, consult NORGREN. Through misuse, age, or malfunction, components used in fluid power systems can fail in various modes. The system designer is warned to consider the failure modes of all component parts used in fluid power systems and to provide adequate safeguards to prevent personal injury or damage to equipment in the event of such failure. System designers must provide a warning to end users in the system instructional manual if protection against a failure mode cannot be adequately provided System designers and end users are cautioned to review specific warnings found in instruction sheets packed and shipped with these products. N/UK Our policy is one of continued research and development. We therefore reserve the right to amend, 6/06

3 Accessories Bracket reducing nipple Surge damper Pressure port adaptors See page 5 See page 5 See page (steel) (stainless steel G1/4A... G1/4) (G1/2... 1/2 NPT) (stainless steel) (brass/steel) G1/4A... G1/4) (G1/4A... G1/2A) (stainless steel G1/2... G1/2A) (G1/4A... G3/8) (G1/4A... 1/4 NPT) Switching capacity commutator with gold plated contacts Load level Current type Load type Max. permitted constant current I (A) with Us (V) Normal (f. ex. AC ohmic contactor, solenoids) AC inductive, cos ϕ Ÿ 0,7 4 2,5 1,5 0,9 Minor (f. ex. electronic AC inductive spark quenching with RS contact 6 4 2,5 1,5 switching circuit) DC ohmic 2 0,9 0,45 0,2 DC inductive, L/R = 10 ms 1 0,3 0,09 0,02 DC inductive, spark quenching with diode 1,5 0,7 0,35 0,15 Reference number: 30/min Reference temperature: +30 C (with a reference temperature of + 70 C, Imax corresponds to 50% of the tabulated values only) Imax = 1.5 x Imax table Contact-life appr. 1 x 10 6 switching cycles at max. current (at 50% of max. current, contact life is appr. 3 times as long) Mechanical life appr. 5 x 10 6 switching cycles For non-aggressive atmosphere, which in particular does not contain any sulphur, the following limits are valid: Microswitch with silver contacts (standard): Umin ca V, lmin ca. 10 ma Maximum values acc. to table above. Microswitch with gold-plated contacts: Umin and Imin: No lower limit Sensible upper limit: Umax ca. 48 V, lmax ca. 20 ma; (for higher values silver spring contacts are completely sufficient). Proposal for spark extinction with direct voltage 1. Diode D parallel to the inductive load. Observe correct polarity with connection (positive pol at cathode). Dimensioning specificatons for erasing diode: Nominal voltage of the diode UD 1,4 Us. Nominal current of the diode IN ILast Select fast switching diodes (blocking recovery time trr 200 ms) 2. RC element parallel to the load (or parallel to the switching contact). Suitable for direct voltage and alternating voltage. Dimensioning principles: R in Ÿ 0,2 x RLoad in W C in µf Ÿ RLoad in A + (AC) Creepage and air paths correspond to insulation group B according to VDE Reg (except contact clearence of microswitch). U S p R Last D R - (AC) I Last C N/UK

4 Basic dimensions 115,5 19 5, C M4 x 10 deep ➀ 72, ø 45,5 ø 53 Electrical connector M20 x 1,5 acc. to DIN ca. 27 M 20 x 1,5 6 ø 5-8 N/UK Our policy is one of continued research and development. We therefore reserve the right to amend, 6/06

5 Mounting (2 brackets and 4 screws) Steel Type: Stainless Steel (AISI 304) Type: Surge damper Stainless steel (AISI 304) Type: Brass/steel Type: Stainless steel (AISI 304) Type: ø 21,5 34 ø Pressure port adaptors G1/2... 1/2 NPT Stainless steel (AISI 303/304 S) Type: G1/4... G1/2 Stainless steel (AISI 303/304 S) Type: G1/4 to G3/8 Steel Type: G1/4 to 1/4 NPT Brass Type: G1/4 27 1/2 NPT, ,8 118,5 G 3/8 ø21, /4 NPT ø 20 6,5 30 N/UK

Model range*1) Switching pressure difference

Model range*1) Switching pressure difference Pneumatic pressure switch electromechanical actuated -...00 bar, G/2 Microswitch with gold plated contacts Intrinsically safe operation Electrical connection: connector acc. to IN EN 7530-803 (form A)