Axial duct fan
DZR 25/2 B Ex t
Manufacturer: MAICO
Axial duct fan, DN250, three-phase AC, explosion-proof, medium: dust
Product data sheet
Characteristic curve
Dimensioned drawing
DZR 25/2 B Ex t - Dimensioned drawing [mm]
Number of flange holes: 6
Technical data
DZR 25/2 B Ex t - Technical data
Accessories
DZR 25/2 B Ex t - Accessories
Specific accessories
| Product type | Name | Art. No. | Price*(EUR) | Action |
|---|---|---|---|---|
| Flexible coupling | ELA 25 Ex | 0092.0275 | on request | |
| Flexible cuff | EL 25 Ex | 0092.0232 | on request | |
| PTC thermistor triggering device | MVS 6 | 0157.0585 | on request | |
| Machine protection relay thermistor | TMS | 0157.0992 | on request | |
| Differential pressure switch | DDEx 500 | 0157.0302 | on request | |
| Vibration sensor | SWEx | 0157.0303 | on request |
General accessories
| Product type | Name | Art. No. | Price*(EUR) | Action |
|---|---|---|---|---|
| Shutter | AS 25 Ex New development | 0151.0403 | on request | |
| External grille | MLZ 25 | 0151.0102 | on request | |
| Protective grille, metal | SG 25 | 0150.0115 | on request | |
| Counter flange | GF 25 | 0056.0003 | on request | |
| Counter socket | GS 25 | 0055.0169 | on request | |
| Suction nozzle | AD 25 | 0180.0620 | on request | |
| Mounting foot | FU 25 | 0036.0070 | on request | |
| Vibration damper | GP 10 | 0092.0151 | on request | |
| Reversing switch | W 1 | 0157.0101 | on request | |
| Reversing switch | WU 1 Discontinued product | 0157.0102 | on request | |
| 5-step transformer | TR 0,4-2 | 0157.0147 | on request | |
| 5-step transformer, control cabinet | TR 0,8 S-2 | 0157.0151 | on request | |
| 5-step switch for TRE...S -2/ TR...S-2 5-step transformers | DSS 20 | 0157.0750 | on request | |
| Mounting and sealing material | BD 25 No longer available for delivery | 0092.0133 | on request |
Product description
Productdescription
DZR 25/2 B Ex t
short description
Axial duct fan, DN250, three-phase AC, explosion-proof, medium: dustProduct description
Product model
- For usage temperatures of -20°C ≤ Ta ≤ +40°C.
Special features
- Axial duct fan, explosion-proof, medium: dust.
- Explosion protection and approvals in accordance with ATEX and IECEx.
- Ex II 2 D Ex tb IIIB T135°C/T200°C Db IP64 X / Ex II 2 D Ex h IIIB T135°C/T200°C Db X.
- Operating temperatures depend on temperature class: T135°C -20 °C ≤ Ta ≤ +40 °C, T200°C -20 °C ≤ Ta ≤ +60 °C.
- Qualified for all dusts of the Ex-group IIIA and IIIB.
- MAICO Ex fans fulfil the safety requirements of European Directive 2014/34/EU for units and protective systems in potentially explosive atmospheres.
- For zone 21 and 22.
- Types of ignition protection: “t” - protection through housing and “c”- constructional safety.
- IP 64 degree of protection.
- Can be switched to ventilation or air extraction.
- Duct sleeve made of galvanised sheet steel, with flange on both sides – hole pattern according to DIN 24155
- For easy and direct installation in a duct system.
- Can be fitted in any position.
Impeller
- Axial impeller made of conductive plastic.
- Balance quality of the motor/impeller combination G 6.3 according to category BV-3 in accordance with ISO 14694.
Air flow direction
- The air flow direction is marked.
- Standard exhaust air mode, air flow direction with air drawn across motor.
Motor
- Robust three-phase AC motor with ball bearings, maintenance-free.
- Reversible.
- Reversing mode: The volumetric flow is reduced by approx. 35 % with abnormal air flow direction.
- S1 operating mode (continuous operation).
- Speed control permitted with TR... transformer. Exception: DZR 35/2 B Ex...
- The temperature in the fan motor is monitored by PTC thermistors. The PTC thermistors must be connected to a triggering system (safety device according to Directive 2014/34/EU), that separates the fan permanently from the power if the temperature gets too hot.
- The MAICO PTC thermistor triggering device MVS 6 or TMS is recommended as the triggering system.
Electrical connection
- Terminal box mounted on the fan, explosion-proof, with cable screw connections.
Required safety technology
- A PTC thermistor triggering device is needed to fuse the DZR-Ex units.
- Maico provides the MVS 6 PTC thermistor triggering device and TMS for this purpose.
- MVS 6 thermistor triggering device.
- Independent complete system.
- For monitoring the maximum motor temperature.
- Type-examination tested according to Directive 2014/34/EU (ATEX).
- Installation exclusively in non-explosive areas.
- TMS thermistor machine protection relay.
- For monitoring the maximum motor temperature.
- Suitable for installation in control cabinets.
- Type-examination tested according to Directive 2014/34/EU (ATEX).
- Installation exclusively in non-explosive areas.
Safety information
- The fan may be operated only if the protection against accidental contact with the impeller is guaranteed to be in accordance with DIN EN ISO 13857 for fans with free inlet and outlet, e.g. with an SG protective grille.
Special versions
- Special voltages are available on request, at an extra cost.
- Information on operation at temperatures occasionally below -20°C available upon request.
- Feasibility must be checked in each case.
Wiring diagram
DZR 25/2 B Ex t - Wiring diagram
Downloads / Videos
DZR 25/2 B Ex t - Downloads / Videos
Predecessor - successor
DZR 25/2 B Ex t - Predecessor
| Product type | Name | Art. No. | Action |
|---|---|---|---|
| Axial duct fan | DZR 25/2 A-Ex No longer available for delivery | 0086.0761 |
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