General rules for installation
Important note: These limiters are intended to monitor or control temperatures in gas or dust hazardous areas.
For gas hazardous areas, this equipment is approved as “Ex-mb” and is suitable for use in zone 1 and zone 2, gas group IIC (Hydrogen/Acetylene, the highest protection group), with a temperature classification T4 ;
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), maximum allowed equipment temperature 125°C.
The thermostat electrical connections at the end of the wires must be made inside an EX-“e” enclosure.
Approvals: These thermostats are certified: ATEX: TÜV 22 ATEX 8891 X ; IECEx: TUR 22.0056X ; CCCEx: 2023012315062866
Housing: IP65 Anodized aluminum, epoxy potted, many different dimensions, see drawings
Temperature sensing element: Miniature bimetal disc, not current sensitive
Electrical connection:
- 4VA: XLPE insulated cable, 2 × AWG16 (≈2 × 1.25mm²), 300V, UL style 4441, withstanding -40+125°C (-40+257°F),
- 4VB: Two XLPE insulated wires, AWG16 (≈ 1.25mm²), 300V, withstanding -40+125°C (-40+257°F),
Wire ends with crimped terminals. Other lengths on request.
Ground: By the enclosure body
Adjustment: These limiters are factory calibrated, with no adjustment possible by user. Calibration values are checked on it before encapsulation.
Mounting: Surface or through wall
Response time: These limiters are not designed to respond quickly if the temperature rise rate is higher than 0.5°C per minute
Contacts: Single pole snap action contact, open or close by temperature rise
Electrical rating: 12A 240V resistive (30.000cycles) and 8A 240V inductive (6.000 cycles). Suitable for power control, remote control of relay coils or PLCs circuits.
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.
Classification:
Gas: Ex II 2G Ex mb IIC T4 Gb
Dust: Ex II 2D Ex tb IIIC T125°C Db
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