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General rules for installation

Important Note: These bulb and capillary thermostats are intended to monitor or control temperatures in gas or dust hazardous areas, by being mounted on pipes, in particular for electrical tracing applications. PPS enclosure and stainless-steel accessories allow their use in industrial or marine environments, including in cold polar areas.
For gas hazardous areas, this equipment is approved as “Ex-eb db” and is suitable for use in zone 1 and zone 2, gas group IIC (Hydrogen/Acetylene, the highest protection group), with a temperature classification T6;
For dust hazardous areas, this equipment is approved as “Ex-tb”, suitable for use in zone 21 and zone 22, the dust group is IIIC (electric conductive dust, the highest protection group), with ambient temperature limits on its body from -60°C to +70°C. The thermostat, box and terminal block assembly is an inseparable unit.

Ambient temperature on the enclosure may also be limited by the maximum ambient temperature allowed on the temperature sensing element (See the parts numbers table).

Approvals: These thermostats are certified:

ATEX: TÜV 22ATEX 8893 X;

IECEx: TUR 22.0058X;

CCCEx: pending

Housing: In addition to the rigorous testing required by explosion-proof equipment standards, the enclosure material was selected to provide the following environmental resistance:
- Neutral salt spray (NSS): 1008-hour tests according to DIN EN ISO9227 (corrosion tests in artificial atmospheres), the longest duration.
- UV exposure: tests according to UL746C Table 25.1 and ISO 4892
Enclosure diameter 150mm, maximum depth 200mm. It also includes a 125mm PPS foot allowing offset mounting on pipes. Waterproof class IP66. Shock resistance greater than IK10.

Lid: Unscrews in a ¼ turn, with lock. The lid also includes a stainless-steel anti-fall chain and two sealing holes. The lid automatically locks in the closed position. It can be unlocked simply with a small flat screwdriver.

Temperature sensing element: Liquid expansion bulb and capillary based on hydrocarbon oils or liquid metalloids. The capillary is protected by a corrugated flexible stainless-steel sheath.

Adjustment: By dial graduated in °C (°F on request). Access to the adjustment is only possible after removing the cover and turning off the power.
Electrical connection: On internal terminal block for conductors from 0.5mm² to 4mm², or from 1 to 6mm² tightening by screw. There are two ground terminals on the terminal block and one on the thermostat body. See common configurations table below.

Identification: Unalterable anodized aluminum plate, riveted, fixed to the rear side.

Cable glands: An M20 cable gland and an M25 cable gland are incorporated as standard on the right side. Up to 2 tapped holes for 16, 20 or 25mm cable glands are possible on the opposite side. The foot includes a special cable gland that can accommodate up to two flat heating cables and a diastat capillary with a 6mm diameter wall penetration fitting. Tightening the foot cable gland is secured by 4 stainless steel M6 locking screws.

Assembly: On pipes, by hose clamp (10×35mm passage allowing two clamps side by side).

Maximum temperature supported by the pipe mounting foot: 220°C

Contacts: SPDT (snap action contact)

Electrical rating: Suitable for power control, remote control of relay coils or PLCs circuits, and direct power switching.

These devices use silver contacts or silver alloy contacts. Due to the possible oxidation of the contacts in time, we do not recommend the use of AC or DC low-voltage circuits (24V or less) if the switched intensity is less than 100mA, or the switched power less than 800mW. Contact us for those applications that require gold-plated contacts. The electrical ratings given are normalized resistive circuit values.
Mechanical life: > 500.000 cycles

Options:
- These enclosures can receive thermostats with sealed fixed setting (Type Y92KAF). See pages of thermostats without enclosure for more information.
- Leg with cable gland for special sized heating cables.

Gas classification: II 2G Ex eb db IIC T6 Gb

Dust classification: II 2D Ex tb IIIC t80°C Db