Hydraulic pressure switch 20D Acc. to ATEX

Transcription

1 Acc. to ATEX 5 to 400 bar For Ex zones 1 and 2 (gases) as well as Ex zones 21 and (dusts) category II2G, type of protection EEx de IIC T6 Microswitch with gold plated contacts Electrical connection: connector M20 x 1,5 Robust metal housing in weather-resisting version Technical data Medium: For neutral, self lubricating fluids, f.ex. hydraulic oil, lube oil, light fuel oil Operation: Piston Port size: G1/4 Operating pressure range: 5 to 400 bar Temperature: Fluid/Ambient: -10* C *Please contact our technical service for use below +2 C. Operating viscosity: Up to 1000 mm 2 /s Repeatability: ±1% of final value (depending on regulating pressure) Switching element: Microswitch with gold plated contacts Degree of protection: IP65 (DIN 40050) Mounting: Optional Shock-/vibrationproof (to avoid, it possible): 4 g max. (sinusoidal), max. 5 Hz Sealing: 10-7 mbar I s -1 Pulsations: Not permitted Switching cycles: Max. 20/min Materials: Housing: aluminium diecast, anodised Sensor: brass or steel Sealing: steel piston (NBR or FKM) Ordering example See page 2 Further versions: Type test certificate acc. to 97/23/EG (DIN /DIN EN 1854) on request p Switching function: Microswitch SPDT (commutator) Terminals 1-3: Contacts close on rising pressure Terminals 1-2: Contacts open on rising pressure N/UK

2 Pressure range for 184 (fixed switching pressure difference) Type Switching pressure range*1) pvu min. to Max. over pressure *2) Switching pressure difference (typical) Fluid contact parts Sensor Port size Dimensions see page pvo max. (VDI 3283) Lower range Upper range bar bar bar bar to ,00 9,00 Brass, steel, NBR K to ,00 18,00 Brass, steel, FKM K 4 Pressure range for 185 (adjustable switching pressure difference) Type Switching pressure Max. over Switching pressure difference (typical) Fluid contact parts Sensor Port size Dimensions range*1) pvu min. to pressure *2) Lower range Upper range see page pvo max. (VDI 3283) min. max. bar bar bar bar bar to ,00,00 0,00 Brass, steel, FKM K G1/ to ,00 40,00 300,00 Brass, steel, FKM K G1/4 4 *1) Reference pressure is the atmospheric air pressure *2) Short-term pressure peaks are not allowed to exceed this limit value during operation. Operative utilization of the limit value is not permitted. The limit value corresponds to the maximum testing pressure K = Piston pvu = Switching point on falling pressure pvo = Switching point on rising pressure Option selection Switching pressure difference fixed 4 adjustable 5 Switching pressure range (bar) 5 to to Ordering example ATEX pressure switch, fixed switching pressure difference, switching point at 5 bar, port size G1/4, medium: hydraulic oil 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 Brackets Surge damper Pressure port Reducing nipple See page 5 See page 5 See page (steel) (stainless steel G1/4) (G1/2 to 1//2 NPT) (stainless steel) (brass/steel) G1/4) (G1/4 to G1/2) (stainless steel G1/2 ) (G1/4 to G3/8) (G1/4 to 1/4 NPT) Switching capacity Commutator with gold plated contacts Load level Current Load type Umin Max. permanent current Imax [A] at U [V] Contact life type [V] M x1 Standard *3) AC ohmic switching cycles (z.b. contractors, AC inductive, solenoids) cos ϕ 0, DC ohmic 5 1,2 0,8 0,4 DC inductive, 3 0,5 0,35 0,05 L/R 10 ms Minor *4) AC ohmic 5 *6) 0,34 0,2 0,17 0,08 0, switching cycles (z.b. electronic DC inductive, circuits) L/R 10 ms 5 *6) 0,1 0,01 Reference number: 30/min, Reference temperature: +30 C Spark quenching with diode with DC and inductive load: I max = 1,5 x I max of table I min = 1 (ma) Creepage and air paths correspond to insulation group B according to VDE Reg (except contact clearance of microswitch). *3) Gold-plating not required as it would decay. Max. perm. in-rush current (appr. 30 ms) I AC = max. 15 A *4) Gold-plating required (will not decay). *6) Lower value of critical voltage guarantees sufficient contact safety. Lower voltages permissible under favourable conditions. Spark quenching with DC voltage 1. Diode D in parallel to inductive load. Observance of correct polarity (positive pole to cathode). Dimensioning specifications for quenching diode: Rated voltage at diode: UD 1,4 x Us Rated current at diode: I N ILast Selection of a quick switching diode (recovery time trr 200 [ms]). 2. RC link in parallel to load in parallel to switching contact. Suited for DC and AC voltage. Dimensioning principles: R in 0,2 x RLoad in C in [µf] ILoad in [A] + (AC) p U S - (AC) R Last I Last D R C N/UK

4 Basic dimensions 115,5 19 5, M4 x 10 deep Elektrical port Connection M20 x 1,5 acc. to EEx e (ATEX), MS nickel-plated for cable Ø 5 to 8 mm (Type: ) ca. 27 M 20 x 1,5 6 ø 5-8 Sensor dimensions Switching H B pressure range 65 61, Sensor ~ H ø B N/UK Our policy is one of continued research and development. We therefore reserve the right to amend, 6/06

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