ASCO 551 Series | Ex ia Intrinsically Safe ATEX IECEx Brass Solenoid Valves NAMUR 3/2 NC 5/2

ASCO 551 NAMUR | Ex ia Intrinsically Safe Brass Solenoid Valves

asco eX ia solenoid valves

intrinsically safe

551 NAMUR brass

ASCO 551 explosion proof solenoid valves are single/dual solenoid valves, which are pilot operated, have an brass body and are 1/4 tapped.

The monostable spool valves are manufactured and certified as Intrinsically Safe for hazardous area use according to IEC explosion protection techniques; IEC 61508 Standard (2010 route 2H version) when used with ASCO LI or WSLI operators and are TÜV and EXIDA certified with integrity levels: SIL 2 for HFT = 0 / SIL 3 for HFT = 1.

eX ia INtrinsically safe solenoid Valves

features

In order to provide better environmental protection against the ingress of liquids, dusts and other foreign matter, all of the exhaust ports are connectable. This is particularly recommended for sensitive areas, such as clean rooms, and applications within the pharmaceutical and food processing sectors
The Ex ia solenoid valves can be externally piloted via an external air pilot supply, in order to convert the valve to zero minimum operation by flipping a gasket
The solenoid valves satisfy all relevant EU directives

ASCO Solenoid Valves & Valve Operators are ATEX & IECEx certified for Class I, Division 2 and Zone 1 & Zone 2 hazardous areas.

asco 551 EX ia solenoid valves

specification

Differential Pressure: 2 – 10,4 bar [1 bar =100 kPa]
Flow (Qv at 6 bar): 1/4 = 700 l/min (ANR)
Fluids: air, inert gas, filtered
Temperature Range: -40°C to +60°C
Seal Materials: VMG (silicone) + PUR (polyurethane)

asco ex ia solenoid valves – ordering information

Pipe Size	Orifice Size	Flow Coefficient Kv		Operating Pressure Differential (bar)			Power Level	Ex ia Prefix (Operator)	Thread Type	ASCO Order Code
				Minimum*	Maximum (PS)
					Air
		(m³/h)	(l/min)		∼	=	∼/=
3/2 NC – 5/2 – Solenoid air pilot operated – spring return (monostable)
1/4	6	0.75	12.5	0 / 2	10	10	Low Power 0.5W – 2W	LI WSLI	NPT ANSI 1.20.3	8551A303**
									ISO G (228/1)	G551A303**
3/2 NC – 5/2 – Solenoid air pilot operated and return (bistable)
1/4	6	0.75	12.5	0 / 2	10	10	Low Power 0.5W – 2W	LI WSLI	NPT ANSI 1.20.3	8551A304
									ISO G (228/1)	G551A304

* Zero minimum is only achieved if external pressure is applied.

**Use suffix “SL” where IEC 61508 Functional Safety data certification is required.

asco 551 namur solenoid valves – dimensions

ASCO 551 3/2 NC & 5/2 NAMUR Valves | Dimensions (mm)

Intrinsically Safe

Type 14 – LI/WSLI

Aluminium, cataphorese black painting / AISI 316L Stainless Steel
LI / WSLI: EN/IEC 60079-11, 60079-31

ASCO Solenoid Valves | Type 14 NAMUR Dimensions (mm)

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Cable gland for unarmoured cable with 7 to 12 mm dia. sheath
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Manual operator location, suffix MO
External pilot air supply, 1/8 pipe size

electrical characteristics & connections

Coil insulation class: F
Electrical safety: IEC 335
Standard voltages: DC (=) 24V – 48V | AC (~) 24V – 48V – 115V – 230V/50Hz; (other voltages and 60Hz are available on request)

Low Power – Type 14
Power Ratings – Hot/Cold (W): 0.5/0.5
Operator Ambient Temperature Range (TS) : -40°C to +60°C
Hazardous Area Safety Code: II1G Ex ia IIC T6 Ga, II2D Ex tb IIIC Db
Electrical Enclosure Protection (EN 60529): IP66/67, Aluminium (LI) Stainless Steel (WSLI)
Electrical Connections: 1/2″ NPT threaded cable entry. Enclosures are supplied without cable gland

Safety Parameters