Metro - C.E.V.

For cabinets and enclosures in outdoor or remote areas where equipment rooms are unavailable or undesired – for non-extreme environments

The Metro unit maintains internal cabinet temperature by allowing controlled external ventilation and internal circulation to avoid ‘hot spots’. This gives the housed electronics and batteries the ability to work at their maximum performance levels through seasonal weather variations.

The Metro's are manufactured to suit any type of cabinet/enclosure. They provide an ideal environment for your equipment that’s reliable, secure, economical and safe.

External vents are fitted with rain hoods and filters to protect against weather, dust and insects. The upper vent allows ventilation to prevent hydrogen build-up.

Ventech recommends the use of Polyester or Polycarbonate enclosures or cabinets depending on specific installation requirements and environmental conditions.

Ideal for:

Remote cell sites - airport runways - traffic lights - weather tracking stations - lighthouses - security systems - basements - roof tops - car parks

Features:

Test Results 150W Heat Load

- 150W_ver_2.JPG With a heat load of 150 watts inside the cabinet and the venting system set to operate at 25°C it can be seen that the internal cabinet temperature is maintained well above the ambient temperature until the venting system operates.

The black dotted line tracks T_AMBIENT and T_CABINET as if there were no restrictions to heating or cooling.

Test Results 265W Heat Load

- 265_ver_2.JPG With an internal heat load of 265 watts and the venting system set to operate at 25°C, the operational temperature shape of the cabinet is clear. T_MAX 24.2°C, T_MIN 5°C gives a T₃ of 19.2°C where temperatures are reasonably constant. Below T_MIN, cabinet temperatures are still maintained well above the ambient temperature.

Insulation

Cabinets are insulated with a thermal insulation material made from Polysafe, an environmentally friendly polyolefin foam, to control heat loss, prevent condensation, to reduce noise and vibration.

External Vents

External vents are fitted with rain hoods and filters to protect against weather, dust and insects. The upper vent allows ventilation to prevent hydrogen build up.

Cabinets

Ventech recommends the use of Polyester or Polycarbonate enclosures or cabinets depending on specific installation requirements and environmental conditions.

Ideal Locations

Remote Cell Sites - Airport Runways - Traffic Lights - Weather Tracking Stations - Lighthouses - Security Systems - Basements - Roof Tops - Car Parks

Security

The outer cabinet is accessed by key entry and has no external screws or fittings. This provides a secure environment for your equipment.

Patents

NZ2004/000173	Patent Co-operation Treaty	Granted
527368	New Zealand	Granted
2004301898	Australia	Granted
ZL200480025212.X	China	Granted
2419745	United Kingdom	Granted
2534446	Canada	Granted
7604534	USA	Granted
2006/01868	South Africa	Granted

Specifications:

Circulation and External Venting Unit

Open State

Internal enclosure temperature is influenced by

weather conditions and from heat generated by

housed components. When ambient temperatures

are high or peak load is reached, the CEV

allows air to pass through components via the

lower vent and filter, then in to the atmosphere

lowering enclosure and component temperature.

Closed State

When component load is less or ambient temperatures

become cooler the thermostatically controlled

CEV will operate and close. This traps any

remaining component heat in the enclosure to

maintain temperature. The CEV circulates air

through the enclosure providing an average

internal air temperature for the control

thermostats and alleviates component hot spots.

Cabinet Specifications

Material

Polycarbonate, Stainless Steel, Sheet metal (dipped coat primed & powder coated), Polyester & Aluminium Will depend on customer individual specifications and requirements

Protection Category

IP 56 to EN 60 529/10.91 IP 66 Complies with NEMA 12. For ES 5080.500 Complies with NEMA 12. (Will depend on customer individual specifications and requirements)

Thermostat Specifications

• Permissible contact load AC-5 (0.2)1)A DC=max. 20W (1)=Inductive load at cos = 0.6 • Setting range 50 – 100% relative humidity • Dimensions 71 x 71 x 33.5 mm • Switching difference approx. 4% • A broad voltage spectrum i.e. just one model covers 24 to 230 V • Time-saving connection technique using a terminal strip with a screw connection from the outside • Flexiable mounting on a vertical or horizontal 35 mm support rail to EN 50 022, and snap fasting in the TS/ES enclosure section using the supplied adaptor

Fan Specifications

Axial Fan Unit 105/120 cubic metres of air an hour Temperature range = 10 degs to +55 degs Noise Level = 46/49 dB (A) Protection Catagory = IP54 Colour RAL7035

Insulation Specifications

Material

Closed cell polyolefin form

Density

(DIN 53571) 25Kg / m³

Thermal Conductivity

(JIS A 1413) @ 20C 50 – 70% R.H = 0.032 W/m.K

Working Temperature

-80º to 100ºC

Noise Reduction

Co-efficient 0.15 (AS1045-1971)

Chemical Resistance

Water (unaffected) Sea water & brine Soaps & detergents Diluted acids Diluted detergents / alkalis Alcohol Ketones Esters

Tensile Strength

(DIN 53571) Lengthwise 4.1 kPa / mm² Crosswise 3.0 kPa / mm²

Fire Ratings

Fire Test Standard

AS 1530.3 (1989)

BS 476 part 6

BS 476 part 7

BS 476 parts 6&7

FMVSS 302

Foil

Ignitability:

Spread of flame

Heat evolved index

Smoke develop index

F.P.I Index

Class 1

Class 0

Pass

0-1

7.9

Filter Mat Specifications

Made of chopped-fibre mat with a progressive structure

Temperature resistant to 100ºC

Self extinguishing category F1 to DIN 53 438

Reliable filtering of virtually all types of dust from a particle size of 10µm